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Low Insertion Loss (low + insertion_loss)
Selected AbstractsPlanar realization of a Q -band triple-mode filter using high-order resonancesMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009Yuandan 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] Compact UWB microstrip lowpass filter with novel CMRCINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2007Fei 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] An optimum superconducting ultra-wideband bandpass filter at VHF bandMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010Wei 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] Miniaturized band-stop filter based on multilayer-technique and new coupled octagonal defected ground structure with interdigital capacitorMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2010A. 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] Rectangle waveguide to substrate integrated waveguide transition and power dividerMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2010Chao 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] A compact microstrip UWB BPF with nonuniformly short-circuited CPW resonatorMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2010H. 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 structureMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2009Ahmed 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] Ku-band substrate integrated waveguide transitions between layersMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2009Kaijun 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] Compact low pass filter using novel elliptic shape DGSMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2009XiaoQun 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] An X-band 185° CMOS phase shifter MMIC for multiple-antenna systemsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009Chien-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] 32-GHz dual-termination coupled CPW bandpass filter on HR-SIMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2008Xi Li Abstract Bandpass filter is an important device in portable communication and other RF systems. A dual-termination coupled coplanar waveguide (CPW) bandpass filter (BPF) has been designed by HFSS. This dual-termination coupled structure improves the coupling capacitances between the central metal and the matching transmission lines so that the insertion loss can be reduced. The filter has been fabricated on a high resistivity silicon substrate (, , 1000 , cm) with 1 ,m SiO2. It has ,2.16-dB low insertion loss at peak transmission of about 32 GHz. This filter shows good s-parameter characteristics and it is attractive for RF ICs. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1705,1706, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23464 [source] A novel crossed slotted patch dual-mode bandpass filter with two transmission zerosMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2008Sean Wu Abstract This article presents a miniaturized dual-mode bandpass filter (BPF) with two transmission zeros and low insertion-loss using crossed slotted patch resonator. The BPF is mainly formed by a ,/2 patch resonator which is a pair of crossed slots with unequal widths is embedded in the center. By tuning the perturbation element, which resulted from the unequal slot widths along the diagonal, two resonant modes are excited and a pair of transmission zeros are generated to improve the selectivity of the BPF performance. The proposed filter at center frequency (f0) of 1.55 GHz has very good measured characteristics including the bandwidth of 1.49,1.62 GHz (3-dB fractional bandwidth of 8.4%), low insertion loss of 1.74 ± 0.35 dB. The measured filter performance is in good agreement with the simulated response. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 741,744, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23219 [source] Novel dual-band microstrip filter using complementary split-ring resonatorsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2008Xin Lai Abstract On the basis of the double resonant property of the complementary split-ring resonators (CSRRs), a novel dual-band microstrip filter is designed, making use of CSRRs as resonant unit and T-shaped stub as feeding structure. More than one transmission zeros are formed due to the cross coupling between the CSRR cells and the T-shaped feeding lines, which have greatly improved the out-of-band property. To validate the proposed method, a dual-band filter with two passbands of 2.4,2.6 GHz and 3.8,4.3 GHz is fabricated and measured, which has a low insertion loss and a high out-of-band rejection. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 7,10, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22983 [source] Cross-coupled Hilbert spiral resonator for bandpass filter designMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2007Ji-Chyun Liu Abstract The modified cross-coupled spiral resonators with Hilbert configuration are introduced for a large coupling coefficient in this article. For comparison, the conventional cross-coupled spiral resonators are fabricated and measured herein. To obtain low insertion loss (,0.27 dB), high out-of-band rejection level (,19.5 dB) and wider FBW (50.9%), the filter of simplified CCSR-H is proposed. Results included surface current distribution and frequency responses are presented and discussed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1890,1894, 2007; Published online in Wiley Inter-Science (www.interscience.wiley.com). DOI 10.1002/mop.22630 [source] CPW-fed dual-mode double-ring resonators with Butterworth approximations for band-pass filter applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2007Ji-Chyun Liu Abstract The CPW-fed configurations of dual-mode ring resonator (DMRR) are introduced to improve the performance of the dual-mode double ring resonator (DMDRR). To obtain low insertion loss (1.65 dB at TM110 mode and 0.91 dB at TM210 mode) and high out-of-band rejection level (,51.95 dB) and wider band (BW 13.09% at TM110 and 16.14% at TM210 mode) filters, using voltage-couples and dual-mode perturbations are proposed here. Simulation results including surface current distributions and frequency responses are presented and discussed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1217,1221, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22397 [source] Design of parallel coupled-line microstrip wideband bandpass filter using stepped-impedance resonatorsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2007Cheng-Yuan Hung Abstract In this article, a parallel coupled-line microstrip wideband bandpass filter (PCM-WBF) using stepped-impedance resonators (SIRs) is designed and implemented on commercial printed circuit board (PCB) of RT/Duroid 5880 substrate. The first two resonant modes of the SIR are coupled together and they are applied to create a wide passband. The proposed filter at center frequency f0 of 5.76 GHz has very good measured characteristics including a bandwidth of 3.63,7.92 GHz (3-dB fractional bandwidth of 74%) and a low insertion loss of ,1 ± 0.9 dB. Experimental results of the fabricated filter show a good agreement with the predict results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 795,798, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22260 [source] A hairpin line wideband bandpass filter design with embedded open stubsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2007Cheng-Yuan Hung Abstract In this paper, a compact three-poles hairpin line wideband bandpass filter with several embedded open stubs to improve the stopband is designed and implemented on print circuit board substrate. This filter at center frequency f0 of 4.25 GHz has presented almost very good measured characteristics, including the bandwidth of 3.1,5.4 GHz (3-dB fractional bandwidth of 54%), low insertion loss of ,0.7 ± 0.4 dB, sharp rejection due to two transmission zeros in the passband edge created by interstage coupling, and wide stopband rejection greater than 15 dB from 5.6 to 11 GHz. Experimental results of the fabricated filter show a good agreement with the predict results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 934,936, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22302 [source] High-dynamic-range C+L band variable optical attenuator using a titled angle shutterMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2006Shien-Kuei Liaw Abstract A high-dynamic-range variable optical attenuator (VOA) using a movable shutter, which moves in a tilted-angle direction to the collimate fiber pair, is proposed. The VOA operates in the C+L band with the advantages low cost, high dynamic range of more than 50 dB, low insertion loss of 0.8 dB, low wavelength-dependent loss (WDL), and low polarization-dependent loss of ±0.4 dB and 0.4 dB, respectively, with attenuation of 50 dB. A compact size of 5.0 × 1.5 × 1.5 cm is obtained. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1000,1002, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21547 [source] Microstrip stepped-impedance hairpin resonator low-pass filter with defected ground structureMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2006Ju-Hyun Cho Abstract In this paper, a new microstrip stepped-impedance hairpin resonator (SIR) low-pass filter (LPF) using a defected ground structure (DGS) is proposed. The proposed SIR hairpin low-pass filter using DGS provides a very sharp cutoff frequency response with low insertion loss. Furthermore, the SIR hairpin low-pass filter can provide attenuation poles for the wide-stopband characteristic due to the resonance characteristic of the DGS. Design parameters for the SIR low-pass filter are derived based on stepped-impedance theory and the equivalent-circuit model for the DGS. The experimental results show excellent agreement with the theoretical simulation results. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 405,408, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21364 [source] Side-firing sealing caps for hollow optical fibersLASERS IN SURGERY AND MEDICINE, Issue 8 2006Tomonori Watanabe BS Abstract Background and Objectives Hollow optical fibers are useful for delivery of high-energy infrared laser beam such as Er:YAG lasers. We propose side-firing optics for hollow optical fibers for laser endoscopic applications mainly in oto-rhino-laryngology and urology. Study Design/Materials and Methods To produce a circular beam, cone-shaped caps are designed and caps with slanted end are proposed for producing a spot beam in side direction. Both types of caps are fabricated by fusing and polished Pyrex and silica glass tubes. Results For the both of the cone-shaped and slanted-end caps effectively deflect laser beam as designed and these caps show high durability for Er:YAG laser light with pulse energy higher than 100 mJ. Conclusions By choosing the proper shape of the cap ends, these caps deflect an input laser beam to a preferred direction at low insertion losses. By using these side-firing optics, one can easily irradiate the inside of tubular organs. Lasers Surg. Med. 38:792,797, 2006. © 2006 Wiley-Liss, Inc. [source] A novel four-stages double-layered dielectric waveguide bandpass filter in LTCCMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2007Fei Liang Abstract This study presents a novel four-stage double-layered waveguide bandpass filter and its simulation method. The longitudinal size of the waveguide filters is reduced by 50% due to the application of double-layered structure. The four-stage double-layered bandpass filter with a 8.8 mm length, 6.2 mm width, and 1.6 mm height is manufactured by LTCC. It has a center frequency of 5.21 GHz, bandwidth of 300 MHz, pass-band ripple of 0.1 dB, and insertion loss of 0.8 dB, which shows miniaturization, low insertion losses and meets the demand of next generation of WLAN system. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1837,1840, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22587 [source] | ||||||||||