Insertion Loss (insertion + loss)

Distribution by Scientific Domains

Kinds of Insertion Loss

  • low insertion loss
  • minimum insertion loss


  • Selected Abstracts


    Insertion loss of lensed fiber collimator with larger gradient-index lens diameter

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2010
    Yu-Cheng Lin
    Abstract The insertion loss of lensed fiber collimator using gradient-index fiber of 140-,m diameter spliced to single-mode fiber is investigated. The power transmission equation is applied for theoretical analysis of the insertion loss between a lensed fiber pair. Both numerical and experimental data are presented in axial and lateral displacement. The optimum coupling position 600 ,m for 0.29-pitch lensed fiber and the maximum working distance 1027 ,m for 0.27-pitch lensed fiber are demonstrated. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1235,1238, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25171 [source]


    Insertion loss and linearity of III-nitride microwave switches

    PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 10 2010
    Jianyu Deng
    Abstract We report the insertion loss and linearity characteristics of novel microwave switches based on III-Nitride heterostructure field-effect transistors (HFETs) and Metal-Oxide-Semiconductor HFETs (MOSHFETs). The high mobility and large sheet carrier density make nitride-based microwave switches ideal candidates for high power, low loss and high linearity microwave switching applications. The demonstrated SPDT switch achieved the third order intermodulation power of -68 dBm for 250 micron devices at 1 GHz and 10 dBM input power and the extrapolated IP3 of >80 dBm with <0.25 dB insertion loss and >35 dB isolation for 2GHz operation for 3mm devices. Further improvements of the insertion loss and linearity are expected from new material and contact development, which will achieve lower 2DEG sheet resistance and contact resistance. ( 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]


    Composite right/left handed artificial transmission line structures in CMOS for controlled insertion phase at 30 GHz

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 2 2009
    Symon K. Podilchak
    Abstract Two CMOS integrated circuits are presented that utilize metamaterial composite right/left handed (CRLH) transmission lines (TLs) for zero insertion phase at 30 GHz. Specifically, 2 and 3 unit cell structures are presented with controlled insertion phase that is achieved by cascading lumped element capacitors and spiral inductors in an LC network configuration defining the TL unit cells. Furthermore, the fixed TL structures suggest the possibility of zero, advanced or delayed insertion phases by element variation, or by the use of simple active components. Simulation and measured results are in good agreement with CRLH TL theory, and display a linear insertion phase and flat group delay values that are dependent on the number of unit cells with an insertion loss of ,0.8 dB per cell. These findings suggest that such high speed CRLH TLs structures can be implemented for linear array feeding networks and compact antenna designs in CMOS at millimeter wave frequencies. 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2009. [source]


    Microstrip dual-band bandpass filters using parallel-connected open-loop ring resonators

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2008
    Lung-Hwa Hsieh
    Abstract This article proposes a microstrip dual-band bandpass filter that uses parallel-connected open-loop ring resonators. Compared to many microstrip dual-band filters, the advantages of using microstrip open-loop ring resonators are easy calculation (half-guided-wavelength), easy fabrication (equal width for all 50-, lines and without grounding holes), and direct connection to external feed lines (reducing insertion loss caused by gap couplings). Another advantage of the filter is an asymmetrical feed on the ring resonator that provides sharp rejections at its adjacent bands. The input and output matches of resonators to the external feed lines are derived using a simple transmission-line theory. The results of the derivation provide a simple design rule for filter designers. Simulated and measured results are presented with good agreement. The filter has minimum insertion loss of 1.25 dB at 1.85 GHz and 1.6 dB at 2.33 GHz. The 3-dB fractional bandwidths are 5.9% for the 1.9-GHz bandpass filter and 4.7% for the 2.4-GHz bandpass filter, respectively. 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008. [source]


    Miniaturized planar ferrite junction circulator in the form of substrate-integrated waveguide

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2008
    Wenquan Che
    Abstract The theoretical analysis and engineering implementation of the planar substrate-integrated waveguide (SIW) ferrite junction circulator have been proposed in this article. The ferrite junction circulator is implemented in the form of SIW, taking the features of low profile, small volume and easy integration with other planar circuits. The design strategies of the device have been introduced, including the design consideration of the microstrip transition. One C-band prototype of SIW ferrite junction circulator has been fabricated and measured. The experimental results indicate the bandwidth is about 33% at ,15 dB isolation and the maximum isolation is near 40 dB. However, the insertion loss is a little big, owing to the imperfect dielectric material and fabrication inaccuracy. The SIW ferrite junction circulator and the microstrip transition are integrated into a same substrate, resulting in a very compact planar ferrite junction circulator and indicating potential applications in integrated communication and radar systems. 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008. [source]


    Compact UWB microstrip lowpass filter with novel CMRC

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2007
    Fei Zhang
    Abstract A novel beeline compact microstrip resonant cell, entitled BCMRC (beeline compact microstrip resonant cell), is firstly proposed and analyzed. The photonic bandgap and slow-wave effect of the BCMRC are evaluated. The compact configuration presents ultrawide stopband and improved slow-wave characteristics. Investigation of its scattering/radiation level is also included. An ultrawide band lowpass filter, consisting of three BCMRCs connected in series, is designed and fabricated. The filter has the advantages of low insertion loss in the passband, sharp, high and wide rejection in the stopband and compact size. The experimental results show good agreements with simulation results. 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007. [source]


    MEMS capacitive series switch fabricated using PCB technology

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 4 2007
    Ramesh Ramadoss
    Abstract In this article, an RF MEMS capacitive series switch fabricated using printed circuit processing techniques is discussed. Design, modeling, fabrication, and characterization of the CPW series switch are presented. An example CPW series capacitive switch with insertion loss less than 0.5 dB in the frequency range of 13,18 GHz and isolation better than 10 dB up to 18 GHz is discussed. The switch provides a minimum insertion loss of about 0.1 dB at the self-resonance frequency of 16 GHz and a maximum isolation of about 42 dB at 1 GHz. 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007. [source]


    RF MEMS-based tunable filters

    INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2001
    James Brank
    Abstract This paper overviews the application of RF MEMS switches in tunable filters as well as circuit developments for bandpass filters covering 110 MHz to 2.8 GHz. RF MEMS have several desirable features, including small size, low power requirements, and low loss. The basic operation of Raytheon's RF MEMS capacitive membrane switch is described. An overview of the technique used to integrate the switch into a variable capacitor structure with sixteen capacitance states is provided. Variable capacitor structures are used to construct multipole lumped bandpass filter designs, each with sixteen states. Finally, measured data from two representative five- and six-pole bandpass filters are presented. Characterization data demonstrates that the insertion loss for the five-pole filter using on-chip inductors was between 6.6 and 7.3 dB, and between 3.7 and 4.2 dB for the six-pole filter using off-chip inductors. 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11: 276,284, 2001 [source]


    An optimum superconducting ultra-wideband bandpass filter at VHF band

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010
    Wei Chen
    Abstract A highly selective superconducting ultra-wideband filter with a passband from 125 to 260 MHz is designed and demonstrated using a microstrip structure. The filter is designed according to a circuit model for an optimum short-circuited stub transmission-line filter and consists of 10 shunt short-circuited stubs separated by connecting lines. The short-circuited stubs are quarter-wavelength long, and the connecting lines are half-wavelength long. The filter is realized on two 3-inch YBCO/LaAlO3 substrates, which are connected by two bonding wires. The short-circuited stubs are grounded via two grounding pads that are attached to the box wall by a number of SiAl bonding wires. The measured results exhibit a selective filtering characteristic equivalent to a 19-pole Chebyshev filter and a low insertion loss of less than 0.1 dB at center frequency without tuning. Furthermore, the experimental results of the filter are in good agreement with the simulated ones. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2639,2641, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25571 [source]


    Compact ultra-wideband bandpass filter using defected ground structures

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2010
    J. K. Lee
    Abstract In this letter, a compact ultra-wideband (UWB) bandpass filter (BPF) is presented with improved upper stopband performance using six defected ground structures (DGS). The proposed BPF is composed of seven DGSs which are positioned under the input and output microstrip line and coupled double step impedance resonator (CDSIR). By using CDSIR and open loop defected ground structure (OLDGS), we can achieve UWB BPF characteristics, and by using the conventional DGSs under input and output microstrip line, we can improve upper stopband performance. Simulated and measured results are found in good agreement with each other, showing a wide passband from 3.4 to 10.9 GHz, minimum insertion loss of 0.61 dB at 7.02 GHz and the group delay variation is less than 0.4 ns in the operating band while wide upper stopband with more than 30 dB attenuation up to 20 GHz. In addition, the proposed UWB BPF has a compact size. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2173,2175, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25436 [source]


    Effects of parasitic resonance on a vertical transition in multilayer printed circuit boards

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2010
    Sung Tae Choi
    Abstract This article reports on parasitic resonance effects of a ground plane with/without a ground opening underneath a signal via with an open stub on the performance of a vertical transition in a multilayer printed circuit board. An equivalent circuit model that accounts for the parasitic resonance due to the open stub inductance and the parasitic capacitance is developed and verified with the measured and simulated results. The fabricated transition exhibits a return loss better than about 10 dB and an insertion loss less than 1.9 dB up to 21.5 GHz. A good agreement is observed between measured and simulated results. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 2098,2100, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25404 [source]


    Characteristics of two-segment lensed fiber collimator

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2010
    Yu-Cheng Lin
    Abstract A two-segment lensed fiber collimator using gradient index fiber (GIF) of 140 ,m diameter spliced to a coreless fiber (CLF) of 125 ,m, and a single mode fiber (SMF) is demonstrated. The CLF and GIF are treated as a beam expander and lens, respectively. The complex beam parameter method and ABCD law are applied for theoretical analysis. Both numerical and experimental data are presented for optical characterization of the divergence angle and insertion loss in lateral and axial displacement of the device. The divergence angle of 1.5 degrees is obtained for the wavelength of 1.31 ,m at the GIF length of 180 5 ,m and the CLF length of 350 ,m. The variation of insertion loss due to lateral and axial displacement shows good agreement with theory. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1846,1848, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25353 [source]


    Insertion loss of lensed fiber collimator with larger gradient-index lens diameter

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2010
    Yu-Cheng Lin
    Abstract The insertion loss of lensed fiber collimator using gradient-index fiber of 140-,m diameter spliced to single-mode fiber is investigated. The power transmission equation is applied for theoretical analysis of the insertion loss between a lensed fiber pair. Both numerical and experimental data are presented in axial and lateral displacement. The optimum coupling position 600 ,m for 0.29-pitch lensed fiber and the maximum working distance 1027 ,m for 0.27-pitch lensed fiber are demonstrated. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1235,1238, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25171 [source]


    Miniaturized band-stop filter based on multilayer-technique and new coupled octagonal defected ground structure with interdigital capacitor

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2010
    A. Boutejdar
    Abstract In this article, we proposed a new compact defected ground structure (DGS) band-stop filter with broad passband and low insertion loss in the stop-band. The philosophy of the structure behind this new microstrip band-stop filter is simple as it is composed of a pair of octagonal DGS-slots and an open-stub as compensated microstrip capacitance. The filter will be realized through direct electromagnetic coupling and slow wave effect methods. With this configuration, the BSF with higher compactness, broad passband and sharp transition characteristics was realized. The design formulas are derived by using an equivalent-circuit model of a parallel L - C resonator. Finally, an interdigital-capacitor has been designed and included in the DGS-ring-element. Better compactness of the structure and symmetry of the frequency response have been achieved as well as two reflection zeros closed to the stopband have been obtained. Thus, a selectivity of the proposed filter has been improved. To validate the feasibility of the proposed design method, both band-stop filters are designed, fabricated, and measured. The experimental results agree well with the simulation results. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 510,514, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24967 [source]


    Study on RF MEMS switch with four parallel Ohm contacts for power handling enhancement

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2010
    Zewen Liu
    Abstract In this article, we present a recent study on enhancement of the power handling capability in wideband Ohm contact type RF MEMS switch. The series Ohm contact switch presents a very good wideband RF performance in the DC to 30 GHz. To improve its power handling capability, switch unit consisted of four parallel single Ohm contact (FPOC) had been designed, fabricated, and measured. In this way, the power handling capability can be improved because of the reduction of contact resistance. The measurement results reveal that the FPOC switch insertion loss is 0.1 dB at 4 GHz and 0.3 dB at 10 GHz; its isolations are 25 dB at 4 GHz and ,16 dB at 10 GHz. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 665,667, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25025 [source]


    Rectangle waveguide to substrate integrated waveguide transition and power divider

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2010
    Chao Li
    Abstract A novel Ku-band transition and power divider between rectangle waveguide (RWG) and substrate integrated waveguide (SIW) is proposed. This transition and power divider is realized by a radiating metal patch located on the backside of a middle dielectric substrate and a coupling aperture etched on the SIW's ground plane. The transition and power divider is studied both simulatively and experimentally. As reported, low insertion loss of not higher than 0.6 dB and good return loss of ,15 dB may be achieved at the frequency range of 12.1,12.8 GHz. The method to increase the bandwidth is investigated. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 375,378, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24902 [source]


    Compact microstrip low-pass filter using complementary split ring resonators with ultra-wide stopband and high selectivity

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2010
    Hui-Yong Zeng
    Abstract The transmission characteristic of the microstrip with complementary split ring resonator (CSRR) is researched. Compared with the conventional structure, this filter can achieve a wider bandgap by shifting the gap of CSRR from the side of the microstrip to the underside. And then, a lower transmission zero can be realized by loading a pair of narrow slots in the gap of the ring. The equivalent circuit model of the structure is provided. By cascading CSRR cells with different transmission zeros, a ultra-wide bandgap low-pass filter (LPF), which has a cutoff frequency at 4.3 GHz is designed. The designed LPF has a high performance with an insertion loss lower than 0.3 dB in pass band, a high out-band suppression more than 20 dB (4.55,25 GHz), and a very sharp transition band about 0.25 GHz (4.3,4.55 GHz). 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 430,433, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24942 [source]


    A compact microstrip UWB BPF with nonuniformly short-circuited CPW resonator

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2010
    H. Chen
    Abstract A novel and compact ultra-wideband bandpass filter using hybrid microstrip/coplanar waveguide is presented. The proposed filter consists of a single coplanar waveguide with nonuniformly short-circuited resonator, which is broadside-coupled to two microstrip open-circuited stubs on the other side of a common substrate. The measured results show that the filter has a good performance, including a low insertion loss, a group delay variation of less than 0.25 ns within the passband, stop-band of up to 18.8 GHz at high frequencies, and an out-of-band rejection level of below ,16.5 dB from 11.4 to 18.8 GHz. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 216,218, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.24859 [source]


    A miniature 5.2-GHz bandstop microstrip filter using multilayer-technique and coupled octagonal defected ground structure

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2009
    Ahmed Boutejdar
    Abstract In this article, we propose a new compact defected ground structure (DGS) bandstop filter with broad pass-band, low insertion loss in the stop-band, and sharp transition from pass- to stop-band. The bandstop filter structure is simple as it is composed of a pair of octagonal DGS slots and open stubs as a compensated microstrip capacitance. The filter is realized as a multiplayer structure with wide lossless stop-band. The behavior of the filter has been investigated using EM as well as lumped-element equivalent circuit model simulations. The design equations are derived using an equivalent circuit model of a parallel L,C resonator. The proposed filter has been optimized, fabricated, and measured. The agreement between the simulated and measured results confirms the effectiveness of the proposed concept. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2810,2813, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24770 [source]


    Compact dual-mode bandpass filter using arrow-shaped slot resonator

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2009
    Youngje Sung
    Abstract A novel design of a compact bandpass ring slot filter for achieving dual-mode operation is proposed and experimentally studied. By using an arrow-shaped slot structure as a resonator, the resonant frequency of the proposed filter is significantly lowered, which can lead to a large filter size reduction for a fixed frequency operation. Two degenerate modes are achieved by loading with proper asymmetry, which can be placed at the corner of diagonals. A prototype of the proposed design is implemented and measured. From the measured results, the proposed filter has about 5.2% bandwidth at the center frequency of 0.97 GHz and a minimum insertion loss of 1.07 dB within passband. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2989,2991, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24809 [source]


    Ku-band substrate integrated waveguide transitions between layers

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2009
    Kaijun Song
    Abstract Two types of the substrate integrated waveguide (SIW) transitions between layers are presented in this letter. The SIW circuits have been used to achieve the transition from one layer to other layer. These two types of SIW transitions between layers operating in Ku-band have been designed and fabricated. The measured 10-dB return loss bandwidth of the transition between adjacent layers is about 7 GHz, and the measured 1-dB insertion loss bandwidth is about 5 GHz; the measured 13-dB return loss bandwidth of the unadjacent-layers transition is demonstrated to be about 3.7 GHz, and the measured insertion losses are less than 2 dB from 11.2 GHz to 15 GHz. The simulated and measured results indicate that these two SIW transitions take the advantages of broadband, low insertion loss, and low profile. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2585,2588, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24685 [source]


    Dual-band-rejection filter based on split ring resonator (SRR) and complimentary SRR

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2009
    Xin Hu
    Abstract A novel concept of a compact, low insertion-loss dual-band-rejection filter (DBRF) is proposed, and its equivalent circuit model is given. The filter consists of single split ring resonators (SRRs) on the top of the host microstrip line and Complimentary SRR etched on the back ground plane. The dimensions of the structure are as small as 1.4 cm 2 cm, while high frequency selectivity is achieved at both band edges due to the presence of two transmission zeros. The filter has an insertion loss of better than 1 dB, a return loss of larger than 10 dB in the passband from 3.3 to 4.0 GHz, and two rejections of greater than 30 dB within 2.5,2.6 and 5.2,5.6 GHz. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2519,2522, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24596 [source]


    CPW-fed dual-mode resonators with double-ring and double-square-loop for dual-band applications

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2009
    Ji-Chyun Liu
    Abstract The CPW-fed configurations of dual-mode double-ring resonator (DMDRR) and double-square-loop (DMDSLR) are introduced to achieve the performance of the dual-band filters. To obtain lower insertion loss, higher out-of-band rejection level, and wider band of DMDRR and DMDSLR filters, using two twin-T couples and dual-mode perturbations are proposed here. Simulation and measurement results including surface current distributions and frequency responses are presented and discussed. It can be applied to 0.9 and 1.2 GHz dual-band systems. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2010,2015, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24574 [source]


    Composite right/left-handed transmission line based on Koch fractal shape slot in the ground and UWB filter application

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2009
    Jian An
    Abstract A novel composite right/left-handed transmission line is presented which is synthesized by etching Koch fractal shape slot in the ground plane and series capacitive gap in the conductor strip. Unlike the structures loaded with complementary split ring resonators, the proposed structure can operate at very wideband and is used to design an ultra-wideband (UWB) filter. The UWB filter is fabricated and tested. The relative bandwidth of the ,10 dB return loss is 128% and the insertion loss is larger than ,1.5 dB except at high frequencies. The equivalent circuit model of the proposed structure is presented and the electrical parameters are also extracted. The circuit model results are compared with the simulation and measurement results which verify that not only the extracted parameters are exact but also the equivalent circuit model is reasonable. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2160,2163, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24553 [source]


    In-line fiber-optical polarizer with high-extinction ratios and low-insertion loss

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2009
    Xinyue Wang
    Abstract This letter demonstrated a novel strategy to optimize the extinction ratio and the insertion loss of side-polished fiber-optical polarizers. The polarizer has a portion of the cladding polished away and replaced with only a single layer of thin aluminium film. Extinction ratios up to over 22.6 dB/cm and the insertion loss down to 1,2 dB/cm have been realized. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1763,1765, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24418 [source]


    Compact low pass filter using novel elliptic shape DGS

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2009
    XiaoQun Chen
    Abstract A novel elliptic shape defected ground structure (DGS) is investigated for low pass filter (LPF) applications. An equivalent RLC circuit model is presented and its corresponding parameters are also extracted from the measured S-parameters. The filter presents the advantages of compact size, high selectivity, low insertion loss and high out-band suppression more than 32 dB from 5.15 to 10 GHz. Good agreements with response of equivalent circuit, electromagnetic simulation, and measurement is demonstrated. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1088,1091, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24263 [source]


    Planar realization of a Q -band triple-mode filter using high-order resonances

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009
    Yuandan Dong
    Abstract A simple method for a Q -band planar triple-mode filter with quasi-elliptic function response is proposed in this letter. This filter is implemented using a high-order mode cavity with substrate-integrated waveguide (SIW) technology and standard printed circuit board (PCB) process. By adopting an orthogonal input and output feed-line and introducing some perturbation, transmission zeros are generated on both sides, which have significantly improved filter selectivity and out-of-band rejection. This triple-mode resonator is then combined with a circular dual-mode cavity to obtain a highly selective filter in Q -band with better stopband rejection. Both of the two filters are fabricated and measured. Low insertion loss and sharp sideband characteristic are observed, which is in good agreement with simulation. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 600,603, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24114 [source]


    An X-band 185 CMOS phase shifter MMIC for multiple-antenna systems

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009
    Chien-San Lin
    Abstract The design and implementation of an X-band phase shifter MMIC using the standard 0.18-,m CMOS process is presented. A transformed doublet varactor load is analyzed and applied to a 3-dB quadrature coupler to exhibit large phase shift tuning range and low insertion loss with minimal variation. By using the derived design equations, the implemented CMOS reflection-type phase shifter demonstrates a continuous phase shift tuning range greater than 185, an average insertion loss of 5.2 dB with 0.4 dB variation, and return losses better than 13 dB in 9,11 GHz. The total chip size including I/O pads is 0.76 0.79 mm2. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 645,648, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24131 [source]


    Fully embedded lumped LC-quadrature hybrid coupler into organic packaging substrate for power sampling

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009
    Yi Jae Lee
    Abstract In this article, fully embedded lumped LC-quadrature hybrid coupler are designed, fabricated, and characterized into multilayered organic packaging substrate. This embedded device comprised high Q MIM capacitors and circular spiral stacked inductors. For realizing fully embedded high Q capacitor, barium titanate (BaTiO3) composite high dielectric film was utilized. The measured return loss and isolation were better than 25 dB. Measured insertion loss was about 0.38,0.42 dB at the frequencies ranged from 824 to 894 MHz. The coupler exhibited a coupling loss of 23.3,24 dB. The phase error between through and coupling ports was 1.2,2.4. It has a size of 2.8 mm 2.95 mm 0.77 mm (height), which is the smallest one in the couplers developed onto the packaging substrate. The measured performance characteristics were also well matched with the 3D EM simulated ones. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 845,848, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24173 [source]


    Lattice-type balun with enhanced phase characteristic based on organic system on a package technology

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2009
    Jong C. Park
    Abstract In this article, lattice-type LC balanced-to-unbalanced (balun) embedded into a multilayered organic package substrate have been designed, fabricated, and characterized for low cost and small size WLAN and Bluetooth applications. To minimize the phase error of the embedded baluns, LC resonator was utilized instead of shunt capacitor used at conventional lattice-type balun, furthermore, the quality factors and packaging efficiencies of embedded inductors are maximized by using vertically stacked circular geometry. It has the insertion loss of 0.7 dB, return loss of 21 dB, phase imbalance of 5, and frequency band width ranged from 2.3 to 2.55 GHz. The fabricated balun was significantly reduced in size and volume by using the vertically stacked spiral inductors and MIM capacitors with BTO high DK film. It has a size of 2.7 2.5 0.66 mm (height). It is promising for various RF system on a package (SOP) products with multi functionalities, small size, and low cost. 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 399,402, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24041 [source]