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Return Loss (return + loss)
Kinds of Return Loss Terms modified by Return Loss Selected AbstractsL-strip proximity fed shorted rectangular microstrip antenna for mobile communicationMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2010Amit Kumar Singh Abstract A dual-band L-strip proximity fed shorted rectangular microstrip antenna is proposed and investigated theoretically simulated by HFSS and experimentally. Proposed radiating patch is located about (17.5 mm) above the ground plane. Return Loss and co- and cross polar radiation pattern are presented. Computed and measured results of return loss are in good agreement. The effect of the geometric parameters of the proposed antenna, such as length of the vertical and horizontal portion of the L-strip is also investigated. The impedance bandwidth (,10 dB return loss) 32.5% (calculated) and 33.00% (measured) for the proposed antenna are achieved for optimized antenna design. Significant size reduction (i.e., ,85%) is obtained as compared with conventional rectangular patch of same resonant frequency. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1567,1571, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25235 [source] Miniature microstrip patch antenna loaded with a space-filling transmission line based on the fractal Hilbert curveMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2003D. Gala Abstract A novel miniature antenna loaded with a space-filling shaped transmission line is presented. Return loss and antenna gain results are compared with a traditional square patch. Experimental results show that the antenna presents an electrical area 18 times less than the square patch. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 311,312, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11046 [source] Calculations of return loss of bonding wires fabricated on a test board by FDTD methodMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2007Hsing-Yi Chen Abstract Return losses of bonding wires fabricated on a test board for RF and microwave circuit applications are studied by the finite-difference time-domain (FDTD) method. Simulation results of return losses obtained by the FDTD method are presented and compared with those obtained by the HFSS software and measurements at frequencies of 0.04,6 GHz. It is found that simulation results calculated by the FDTD method make a good agreement with those obtained by the HFSS software. Results of the FDTD method are also further validated by the measurement data. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1603,1606, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22546 [source] Sleeve monopole on a circular ground-planeINTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS, DEVICES AND FIELDS, Issue 5 2003Zhongxiang Shen Abstract This paper presents a modal-expansion analysis of a sleeve monopole antenna on a finite ground-plane. Two perfectly conducting plates (one above the monopole and the other under the ground-plane) are introduced to confine the modeling region and to facilitate the modal-expansion analysis. The resulting guided-wave structure is then divided into a number of regions and the electromagnetic field components in each region are expanded into the summation of its modal functions. The surface current distribution on the monopole and the antenna's input impedance and radiation pattern are obtained by finding the expansion coefficients through matching the tangential field components across the regional interfaces. Calculated results by the modal-expansion method agree well with measured results for the return loss of a sleeve monopole fed through a circular ground-plane by a coaxial probe. Numerical results for the surface current distribution, input impedance, and radiation pattern of a sleeve monopole on a circular ground plane are presented and discussed. Copyright © 2003 John Wiley & Sons, Ltd. [source] An efficient method for analyzing nonuniformly coupled microstrip linesINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 2 2005Dengpeng Chen Abstract This article presents an efficient method for analyzing nonuniformly coupled microstrip lines. By choosing a modal-transformation matrix, the coupled nonlinear differential equations describing the symmetric nonuniformly coupled microstrip lines are decoupled using even- and odd-mode parameters; the original problem is thus transformed into two single nonuniform transmission lines. A power-law function of arbitrary order and having two adjustable parameters is chosen to better approximate the equation coefficients. Closed-form ABCD matrix solutions are obtained and used to calculate the S -parameters of nonuniformly coupled microstrip lines. Numerical results for two examples are compared with those from a full-wave commercial package and experimental ones in the literature in order to demonstrate the accuracy and efficiency of this method. This highly efficient method is employed to optimize a cosine-shape 10-dB codirectional coupler, which has good return loss and high directivity performance over a wide frequency range. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005. [source] A 60-GHz CMOS receiver front-end with integrated 180° out-of-phase Wilkinson power dividerMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010Jen-How Lee Abstract A 60-GHz receiver front-end with an integrated 180° out-of-phase Wilkinson power divider using standard 0.13 ,m CMOS technology is reported. The receiver front-end comprises a wideband low-noise amplifier (LNA) with 12.4-dB gain, a current-reused bleeding mixer, a baseband amplifier, and a 180° out-of-phase Wilkinson power divider. The receiver front-end consumed 50.2 mW and achieved input return loss at RF port better than ,10 dB for frequencies from 52.3 to 62.3 GHz. At IF of 20 MHz, the receiver front-end achieved maximum conversion gain of 18.7 dB at RF of 56 GHz. The corresponding 3-dB bandwidth (,3 dB) of RF is 9.8 GHz (50.8,60.6 GHz). The measured minimum noise figure (NF) was 9 dB at 58 GHz, an excellent result for a 60-GHz-band CMOS receiver front-end. In addition, the measured input 1-dB compression point (P1 dB) and input third-order inter-modulation point (IIP3) are ,20.8 dBm and ,12 dBm, respectively, at 60 GHz. These results demonstrate the adopted receiver front-end architecture is very promising for high-performance 60-GHz-band RFIC applications. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2688,2694, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25559 [source] A novel compact CPW-fed planar monopole antenna with modified stair-style ground for ultra-wideband applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2010Y.-B. Yang Abstract In this article, a simple and compact CPW-fed planar monopole antenna for ultra-wideband applications is presented and investigated. The proposed antenna with a small size of 26 mm × 26 mm × 1 mm is composed of a gourd-like radiation element fed by a CPW feed line, and a modified stair-style ground. The proposed antenna has been successfully designed, fabricated, and measured. The measured results show that the antenna achieves a wide impendence bandwidth from 3.1 to 15.2 GHz with return loss less than ,10 dB. In addition, it exhibits a nearly omnidirectional radiation pattern, stable antenna gain, and good time-domain characteristics across the operation band. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 2100,2104, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25378 [source] A novel CMOS distributed receiver front-end for wireless ultrawideband receiversMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2010Xin Guan Abstract An ultrawideband CMOS distributed receiver front-end utilizing cascade gain cell structure is designed in Jazz 0.18-,m CMOS process. The proposed distributed front-end, fully integrating a low-noise amplifier (LNA) and mixer together, demonstrates 11.5,14 dB gain, 5,6.5 dB noise figure and more than 9-dB RF/LO return loss over 2,17 GHz with a fixed IF frequency of 500 MHz and LO power of 5 dBm. The entire circuit occupies 1.7 × 1.0 mm2 including on-wafer pads and consumes 170 mA from 1.8-V voltage supply. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1790,1792, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25316 [source] A novel dual-band square piece patch antenna for wireless applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2010T. Shanmuganantham Abstract A novel dual-band square microstrip patch antenna for bandwidth improvement and antenna size reduction in a single design is proposed. It can operate at dual frequencies of 1.7 GHz and 5.5 GHz. The fundamental parameters of the antenna such as bandwidth, return loss, gain, radiation pattern, and polarization are obtained. This square piece patch antenna has less return loss of ,40 dB with bandwidth of 40 MHz and 200 MHz in two bands, respectively. The sensitivity of patch antenna towards its patch shape is also discussed. Simulation tool, based on the method of moments (ZELAND IE3D version 12.0) has been used to analyze and optimize the antenna. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1513,1516, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25270 [source] L-strip proximity fed shorted rectangular microstrip antenna for mobile communicationMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2010Amit Kumar Singh Abstract A dual-band L-strip proximity fed shorted rectangular microstrip antenna is proposed and investigated theoretically simulated by HFSS and experimentally. Proposed radiating patch is located about (17.5 mm) above the ground plane. Return Loss and co- and cross polar radiation pattern are presented. Computed and measured results of return loss are in good agreement. The effect of the geometric parameters of the proposed antenna, such as length of the vertical and horizontal portion of the L-strip is also investigated. The impedance bandwidth (,10 dB return loss) 32.5% (calculated) and 33.00% (measured) for the proposed antenna are achieved for optimized antenna design. Significant size reduction (i.e., ,85%) is obtained as compared with conventional rectangular patch of same resonant frequency. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1567,1571, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25235 [source] Broadband Wilkinson balun using pure left-handed transmission lineMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2010Young-Ho Ryu Abstract Utilizing the opposite phase shift property of a microstrip line (MSL) and a pure left-handed transmission line (PLH TL), the broadband Wilkinson balun is designed. The PLH TL without a right-handed (RH) branch is designed using effectively negative elements obtained by a cross connection of vias to ground. The PLH TL gives inherently phase-advanced response properties because of negative phase velocity, whereas a conventional MSL has a phase-lag response. The property of a broadband left-handed branch of a PLH TL applies to the implementation of broadband balun. The proposed balun has a good return loss, a good isolation between output ports, an equal-power division, and a 180° ± 10° phase difference in a wide fractional bandwidth of ,71%. Furthermore, the wideband balun that has the fractional bandwidth of 107.8% is theoretically designed with the modified PLH TL having four unit cells. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1665,1668, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25242 [source] CPW-fed compact slot antenna for WLAN operation in a laptop computerMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2010M. Naser-Moghadasi Abstract A rectangular slot antenna fed by a coplanar waveguide is proposed for dual-band operations. The measured ,10 dB bandwidth for return loss is from 2.05 to 2.65 GHz and 5.1 to 5.4 GHz, covering all the 2.4/5.2 GHz WLAN bands. A multi-feed 12-element planar array was designed and simulated. It shows that the features of small size, uniplanar structure, good radiation characteristics, and small mutual coupling are promising for multi-input multi-output applications in laptops. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1280,1282, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25198 [source] Complementary predistorter in CMOS differential power amplifierMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010Inn-Yeah Oh Abstract For adaptive improvement of linearity above a 12 dB PAPR for 64QAM WiMAX, a complementary feedback loop in a differential amplifier is adopted as a pre-distorter that is realized using an NMOS cell operating in the triode region in order to compensate the gm3, the third order transconductance, of the differential amplifier. The power amplifier has been implemented in 0.18 ,m CMOS technology, and the chip size is 870 ,m × 1050 ,m. The proposed PA obtains the 42% efficiency at P1dB while improving the IMD by more than 10 dB above 15 dBm output power levels. It shows a gain of as much as 14.5 dB, and a return loss below ,12 dB for 2.3,2.4 GHz operation. Finally, the fabricated PA complies with the spurious emission of WiMAX standards up to 22 dBm. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:833,836, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25062 [source] A novel key-shaped CPW-fed monopole UWB antennaMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010Rui-Jin Lin Abstract A novel key-shaped CPW-fed monopole UWB antenna is proposed in this article. A high frequency structure simulator is used to analyze the proposed antenna in the design process. The proposed antenna has an extremely wide frequency band range, the impedance bandwidth of which is measured as 2.87,40 GHz (1:13.9) for return loss <,10 dB. Simulated and measured results are presented for the proposed antenna. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:886,889, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25054 [source] Design and implementation of a high-performance V-band CMOS bandpass filterMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2010Jin-Fa Chang Abstract In this article, we demonstrate a low-insertion-loss V-band (50,75 GHz) bandpass filter with two finite transmission zeros by standard 0.13 ,m CMOS technology. The proposed filter architecture has the following feature: the low-frequency transmission-zero and the high-frequency transmission-zero can be tuned by the series-feedback capacitor Cs and the parallel-feedback capacitor Cp, respectively. Besides, low-insertion-loss is achieved by adopting thick microstrip-line (MSL) with optimized ground-plane pattern as the needed inductors to minimize the metal and substrate loss. This filter achieved insertion-loss (1/S21) lower than 3 dB over the frequency range of 52.2,76.7 GHz, input return loss (S11) better than ,10 dB over the frequency range of 50.2,80.6 GHz, and output return loss (S22) better than ,10 dB over the frequency range of 50.2,77.3 GHz. The minimum insertion-loss was 2.18 dB at 63.5 GHz, an excellent result for a V-band CMOS bandpass filter. The chip area was only 0.466 × 0.307 mm2, i.e., 0.143 mm2, excluding the test pads. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 309,316, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24935 [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] Novel microstrip bandpass filter based on defected ground structure and slotline coupling techniquesMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2010Wenjie Feng Abstract A novel microstrip bandpass filter integrating the defected ground structure and slotline coupling technique is presented in this letter. A slotline resonator with a length of three-quarter wavelength at central frequency is etched on the ground, while a pair of radial stubs is centrally introduced. Two microstrip open stubs are then placed above the slotline resonator, saying, on the top plane of the dielectric substrate. By properly adjusting the lengths of the microstrip stubs, a wideband passband filter is thus implemented using coupling between 50-, microstrip (on the top plane) and the slotline (on the bottom). A prototype is fabricated to validate the proposed design strategies. The experiments and simulations both indicate good performances. The measured fractional bandwidth of prototype is about 89%, the return loss is less than ,15 dB in the whole passband. In addition, the measured rejection bandwidth at ,25 dB is even higher up to 10 GHz, thus, demonstrating a very good harmonic suppression ability. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 4,6, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24816 [source] Dual-band-rejection filter based on split ring resonator (SRR) and complimentary SRRMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2009Xin 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] Compact ultra-wide band microwave filter utilizing quarter-wave length short-circuited stubs with reduced number of viasMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2009Mohammad Shahrazel Razalli Abstract We present here a novel pattern with compact size of ultra-wide band microstrip filter. The filter is originally modeled from five poles quarter-wavelength short-circuited stubs. It is then, transformed into a new compact butterfly-like pattern. This new "butterfly-shaped" pattern consists of three vias instead of five vias from its original design. The prototype has shown an improvement in scattering parameters measurement compared with its original model. It delivers 112% of fractional bandwidth, magnitude of insertion loss better than 1.6 dB and return loss lower than ,8 dB. It is fabricated on RT Duroid 5880 with 2.2 dielectric constant, 0.508 mm of substrate thickness and 35 ,m copper thickness. The overall dimension of the filter is 20.7 × 15.8 mm2. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2116,2119, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24568 [source] A 60-GHz low-noise amplifier for 60-GHz dual-conversion receiverMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2009Yo-Sheng Lin Abstract A 60-GHz-band low-noise amplifier (LNA) using bulk 65-nm CMOS technology is reported. To achieve sufficient gain, this LNA is composed of three cascade common-source stages followed by a cascode output stage. Current-sharing technique is adopted in the second and third stage to reduce power dissipation. The output of each stage is loaded with an LC parallel resonance circuit to maximize the gain over the 57,64-GHz-band of interest. This LNA achieved input return loss (S11) of ,10.6 to ,37.4 dB, voltage gain (AV) of 10.7,18.8 dB, reverse isolation (S12) of ,43.5 to ,48.1 dB, input referred 1-dB compression point (P1dB-in) of ,16.2 to ,20.8 dBm, and input third-order intermodulation point (IIP3) of ,4 to ,7.5 dBm over the 57,64-GHz-band of interest. It consumed only a small DC power of 21.4 mW. In addition, the chip area was only 0.849 × 0.56 mm2, including all the test pads and bypass capacitors. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 885,891, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24200 [source] A 5.79-dB NF, 30-GHz-band monolithic LNA with 10 mW power consumption in standard 0.18-,m CMOS technologyMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2009Chi-Chen Chen Abstract A 30-GHz (Ka-band) low-noise amplifier (LNA) with 10 mW power consumption (PDC) using standard 0.18-,m CMOS technology was designed and implemented. To achieve sufficient gain, this LNA was composed of three cascade common-source stages, and a series peaking inductor (Lg3) was added to the input terminal of the third stage to boost the peak gain (S21-max) from 11.7 (at 28.8 GHz) to 14.5 (at 28 GHz), i.e., 23.9% (simulation). Shunt RC feedback was adopted in the third stage for achieving good output impedance matching. At 30 GHz, this LNA achieved excellent input return loss (S11) of ,19.5 dB, output return loss (S22) of ,23.8 dB, forward gain (S21) of 11.1 dB, reverse isolation (S12) of ,49.2 dB, and noise figure of 5.79 dB. The corresponding gain/PDC was 1.11, which is better than those of the CMOS LNAs around 30 GHz reported in the literature. The measured input-referred 1-dB compression point (P1dB-in) and input third-order intermodulation point (IIP3) were ,10.9 and ,2 dBm, respectively. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 933,937, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24250 [source] 60-GHz bandpass filter with ACMRC resonator fabricated using 0.18-,m CMOS technologyMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009Chia-Hsieh Liu Abstract This article presents design and implementation of a 60-GHz millimeter- wave on-chip bandpass filter using a 0.18-,m standard CMOS process. The asymmetric compact microstrip resonator cell structure is used to design the filter with two transmission zeros. The input and output capacitors using multilayer coupling are added to create the passband. The die size of the chip is 0.85 × 0.64 mm2. The filter has a 3-dB bandwidth of about 15 GHz at the center frequency of 64 GHz. The measured insertion loss of the center-frequency is about 3.9 dB and the return loss is better than 10 dB within passband. The designed on-chip filter is useful for the integrated design of the 60-GHz CMOS single-chip RF transceiver. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 597,600, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24119 [source] Lattice-type balun with enhanced phase characteristic based on organic system on a package technologyMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2009Jong 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] An efficient CMOS on-chip ladder reflector antenna for inter-chip communicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2009Bo-Tao Jiang Abstract This article presented a new ladder reflector antenna on chip (AOC) which consisted of an active dipole and reflector array. The ladder structure was very easy to fabricate with the standard CMOS process. A ladder reflector antenna operating at the 24 GHz ISM band was designed with a standard 0.18 ,m six metal layers CMOS process. The whole antenna had a dimension of 0.025 mm × 2.84 mm. The measurement results showed that the ladder reflector antenna got a return loss of ,7.25 dB and a gain of 6.25 dBds at 24 GHz, as well as a ,5 dB impedance bandwidth of 16.2,30 GHz. The measured S12 indirectly proved the simulated radiation patterns. The data taken from the experiment indicated that the ladder reflector increased the antenna gain and effectively enhanced the energy radiating to the outside of the chip. It's very useful for the wireless interconnect for inter-chip communications. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 59,63, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24000 [source] Ultra-wideband folded loop antenna fed by coplanar waveguideMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2008W. J. Lui Abstract In this article, a novel and successful design of ultra-wideband folded loop antenna is proposed and investigated. The antenna is fed by coplanar waveguide directly and can be fabricated easily by employing printed circuit board technology. It is studied both numerically and experimentally. From calculated and measured results, it may be observed that impedance bandwidth of over 130% for return loss lower than ,9.54 dB and good omnidirectional radiation performance is obtained. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3075,3077, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23890 [source] Miniaturized antenna using half-mode substrate integrated waveguide structureMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2008Cuilin Zhong Abstract An X-band miniaturized antenna which uses half-mode substrate integrated waveguide structure is designed. We analyzed the electromagnetic field using the cavity model and the electromotive force method. The input impedance, simulated and experimental results of return loss, resonant frequency, and radiation patterns are presented. Its performances are as same as those of the corresponding microstrip antenna, but its size is half of the microstrip antenna. This planar structure can be integrated on the same substrate with other components such as filter and amplifier, and it can also be used to easily form antenna arrays. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3214,3218, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23911 [source] Ultra-wideband bandpass filter using simplified left-handed transmission line structureMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2008Wenjia Han Abstract A novel ultra-wideband bandpass filter has been proposed based on a simplified left-handed transmission line (LH-TL) structure. The main design procedure is to define and realize the LH-TL unit cell according to the desired pass band. The filter has been realized in theory, verified by both full-wave electromagnetic simulation and microwave circuit simulation, and confirmed by the measurement with a return loss higher than 12 dB, and the group delay about 0.25 ns over the central band with variation of 0.2 ns. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2758,2762, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23789 [source] A novel dual-band bandpass filter using stepped impedance resonators with transmission zerosMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2008Qing-Xin Chu Abstract A novel dual-band bandpass filter using stepped impedance resonator is proposed in this letter. New coupling structures are illustrated to replace the normal counterparts, the circuit size is reduced about 40% compared with the conventional BPF with the same specifications, while the new structure can generate two transmission zeros in the insertion loss response, to validate the design and analysis, two dual-band bandpass filters centered at 2.4 GHz/5.2 GHz and 2.4 GHz/5.7 GHz for WLAN application were fabricated and measured, it is shown that the measured and simulated performance are in good agreement. The bandpass filters achieved insertion loss of less than 2 dB and return loss of greater than 16 dB in each band. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1466,1468, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23394 [source] A high-performance wideband cmos low-noise amplifier using inductive series and parallel peaking techniquesMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2008Jen-How Lee Abstract A 1,11 GHz wideband low-noise amplifier (LNA) with good phase linearity properties (group-delay variation is only ±35.56 ps across the 3.1,10.6 GHz band of interest) using standard 0.18 ,m CMOS technology is reported. To enhance the bandwidth for achieving both high and flat gain and small group-delay variation, the inductive shunt-peaking technique is adopted in the load of the input stage, while the inductive series-peaking technique is adopted in the input terminal of the output stage. The wideband LNA dissipates 29.46 mW power and achieves input return loss (S11) of ,9.32 to ,9.98 dB, flat forward gain (S21) of 11 ± 1 dB, reverse isolation (S12) of ,46 to ,60 dB, and noise figure of 4.15,4.85 dB over the 3.1,10.6 GHz band of interest. Good 1-dB compression point (P1 dB) of ,14 dBm and input third-order inter-modulation point (IIP3) of ,3 dBm are achieved at 6.4 GHz. The chip area is only 675 ,m × 632 ,m excluding the test pads. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1240,1244, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23338 [source] Design of a diversity antenna with stubs for UWB applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2008Seokjin Hong Abstract A two-element diversity planar antenna for a multiple-input multiple-output application is proposed. By adopting two Y-shaped radiators, the antenna provides wideband impedance matching characteristics over the desired frequency band. To reduce the mutual coupling between two radiating elements, three stubs are inserted in the ground plane. Good impedance matching and improved isolation characteristics are observed. The measured impedance bandwidth of the proposed antenna ranges from 2.27 GHz to 10.2 GHz for a return loss of less than 10 dB. Parametric analysis has been conducted to investigate the effect of radiator length and the insertion of stubs on the impedance bandwidth and isolation characteristics. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1352,1356, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23389 [source] | ||||||||||