Coplanar Waveguide (coplanar + waveguide)

Distribution by Scientific Domains


Selected Abstracts


Accurate closed-form model for computation of conductor loss of coplanar waveguide

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2010
Payal Majumdar
Abstract This study estimates the accuracy of HFSS and Sonnet and other models against the experimental results from three sources. A closed-form model for experiment based stopping distance is developed to calculate accurately conductor loss of CPW. The present improved Holloway and Kuester (IHK) model has an average accuracy of 3.7% against the experimental results from different sources in the frequency range 1,120 GHz with conductor thickness of 0.25,1.58 ,m. The original Holloway and Kuester model has an average accuracy of 13.7% and model of Ponchak et al. 17.1 % against same set of experimental results. HFSS and Sonnet have average accuracy of 7.86% and 10.33% against same set of experimental data. The accuracy of IHK model is also examined against HFSS and Sonnet for the conductor thickness up to 9 ,m and substrate relative permittivity in the range of 3.8,20. 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010. [source]


Synthesis of interdigital capacitors based on particle swarm optimization and artificial neural networks

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 4 2006
Jehad Ababneh
Abstract This article reports on the use of the particle swarm optimization (PSO) algorithm in the synthesis of the planar interdigital capacitor (IDC). The PSO algorithm is used to optimize the geometry parameters of the IDC in order to obtain a certain capacitance value. The capacitance value of the IDC is evaluated using an artificial neural network (ANN) model with the geometry parameters of the IDC as its inputs. Several design examples are presented that illustrate the use of the PSO algorithm, and the design goal in each example is easily achieved. Full-wave electromagnetic simulations are also performed for some of the studied IDC structures implemented using coplanar waveguide (CPW) technology. The simulation results are in good agreement with those obtained using the ANN/PSO algorithm. 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006. [source]


CAD modeling of coplanar waveguide cross-over air-bridge

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2005
Nihad Dib
Abstract In this article, a new CAD model for the coplanar waveguide (CPW) cross-over air-bridge is proposed. The model takes into account the CPW open-end capacitance and the vertical strips of the bridge. The section directly underneath the bridge is modeled as a small section of a microstrip line. Our results are in good agreement with the published full-wave results. 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005. [source]


Distributed MEMS transmission lines for tunable filter applications

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2001
Yu Liu
Abstract This paper describes the design and fabrication of a distributed MEMS transmission line (DMTL), used to realize a transmission-line with a voltage-variable electrical length for microwave circuits. The DMTL is a coplanar waveguide periodically loaded with continuously-variable MEMS capacitors. A tunable bandpass filter was designed and fabricated on 700 ,m thick glass substrates using three capacitively coupled DMTL sections as variable shunt resonators. The measured results demonstrate a 3.8% tuning range at 20 GHz with 3.6 dB minimum insertion loss. Issues for future improvement are discussed. 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11: 254,260, 2001. [source]


Analysis and modeling of microstrip-to-coplanar flip chip package interconnects

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 4 2001
Hussein H. M. Ghouz
Abstract In this paper, the discontinuity of a flip chip transition between a microstrip line and a coplanar waveguide is investigated and modeled using the finite-difference time-domain method (FDTD) to predict the overall S -parameters of the package. Effects of the bump and via interconnects on the package performance are investigated and discussed. This includes the effects of different staggered transitions and ground connects on the package performance. A reduction of about 10 dB in the bump and via reflections can be achieved by staggering the signal (bump) and the ground connects (bump/via). A staggering distance of about twice the slot width gave minimum reflection over a wide band of frequencies. Moreover, the larger the relative distance between the ground and the center connects the less the reflection due to the discontinuity. Finally, the computed S -parameters of the flip chip package using the FDTD solution are used to develop an equivalent circuit model for the transition discontinuity over a wide frequency band. The equivalent circuit model of the microstrip to coplanar waveguide discontinuity includes more elements and is more complex than other types of transitions. A TEE or PI circuit model has been used to approximate the general circuit model of the discontinuity. Good agreement has been obtained between the S -parameters of the FDTD model and the equivalent circuit models over a wide frequency band. 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11: 202,211, 2001. [source]


Novel planar triple band monopole antenna for WiMAX/WLAN applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2010
Hsien-Wen Liu
Abstract A coplanar waveguide (CPW)-fed planar monopole antenna with triple band operation for worldwide interoperability for microwave access (WiMAX) and wireless local area network (WLAN) applications is presented. The antenna, which occupies a small size of 25 (L) 25 (W) 0.8 (H) mm3, is simply composed of a pentagonal radiating patch with two bent slots. By carefully selecting the positions and lengths of these slots, good dual stopband rejection characteristic of the antenna can be obtained, so that three operating bands covering 2.14,2.85, 3.29,4.08, and 5.02,6.09 GHz can be achieved. The measured results also demonstrate that the proposed antenna has good omnidirectional radiation patterns with appreciable gain across the operating bands, and is thus suitable to be integrated within the portable devices for WiMAX/WLAN applications. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2405,2408, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25497 [source]


CPW-fed compact slot antenna for WLAN operation in a laptop computer

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2010
M. 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]


Loss characteristics of coplanar waveguide transmission lines fabricated with copper nanoparticles

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2010
Hee-Jo Lee
Abstract This article investigates the high frequency characteristics of coplanar waveguide (CPW) lines fabricated with inkjet-printing technology on BT substrates. The optimal metallic thickness of a printed CPW line is approximately estimated to be 3 ,m. When printed lines with higher electrical conductivity are realized through additional surface preparation steps, the findings of this study suggest that the RF performance level of these printed lines will be comparable to that of the copper clad laminate lines in the microwave frequency region. Finally, aspects of such improvements as well as applications of these types of printed lines are discussed. 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 780,782, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24987 [source]


Integrated wide,narrow band antenna for multiband applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2010
E. Ebrahimi
Abstract In this article, a novel integration concept is introduced for multiband antennas. An integrated wide,narrow band antenna is presented, which is composed of a shorted microstrip patch integrated to a coplanar waveguide fed ultrawideband monopole antenna. The patch is printed on the reverse side of the substrate using the monopole antenna as a ground plane. A prototype of the antenna is fabricated and verified. This antenna adds the possibility to operate in two of different standards or frequency bands at any given time. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 425,430, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24926 [source]


Design of compact coplanar bandstop filter composed on open-loop-ring resonator and defected ground structure (DGS)

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2010
Anatoliy Batmanov
Abstract Design of a novel compact bandstop filter composed on an open-loop-ring resonator and a defected ground structure (DGS) for coplanar waveguide is proposed and investigated. A simple coplanar open-loop-ring resonator has been designed and tested for the stop-band from 3.9 to 4.3 GHz with tree transmission zeroes inside the stop-band. Two almost symmetrical poles are obtained on both sides of the stop-band. Then the proposed broad band bandstop filter based on the one open-loop-ring resonator has been transformed to the bandstop filter with a narrower stop-band but with improved pass- and stop-band characteristics. It is realized by adding a conventional rectangular DGS slot inside the open-loop-ring. The equivalent circuit model has been proposed to describe the behaviour of the bandstop filters. The improved bandstop filter introduces the stop-band from 3.75 to 5.3 GHz with two transmission zeroes within and more than ,20 dB rejection. The total size of the proposed structure is 13.8 13.4 mm2. Both bandstop filters have been fabricated and measured. Measurements are in good agreement with simulation results. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 478,483, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24905 [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 slot-coupling coplanar waveguide-fed fan-shaped antenna embedded in semicircle aperture

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2009
Qin-Yi Li
Abstract A novel design of a fan-shaped antenna embedded in semicircle aperture is proposed and experimentally studied in this article. The proposed antenna is fed by a tapered coplanar waveguide (CPW) and has an ultrawide band owing to the coupling between the fan-shaped radiation unit and the ground. From experimental results, the measured impedance bandwidth of the antenna, determined by ,10 dB return loss, can reach an operating bandwidth of 23.36 GHz (1.64,25 GHz), more than 175% with the center frequency operating at about 13.32 GHz. Good radiation patterns and gains covering the operating band have been observed. Details of the antenna design and experimental results are discussed in this article. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2385,2387, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24655 [source]


An ultra-wideband bandpass filter using hybrid structure of microstrip and CPW

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2009
Xun Luo
Abstract An ultra-wideband (UWB) bandpass filter is proposed based on the hybrid structure of microstrip and coplanar waveguide (CPW). First, the detached-mode resonator is formed on the CPW layer, which composes a quarter-wavelength (,/4) multiple-mode resonator (MMR) with a short-stub and a ,/4 single-mode resonator. Then, two ,/4 microstrip open-stubs on the top side of the common substrate are introduced for bandwidth enhancement to meet the UWB passband limit. Quasi-elliptic function response and UWB operation are achieved. The simulated and measured results show an excellent agreement. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2470,2473, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24658 [source]


Ultra-wideband slot antenna with band-notch characteristics for wireless USB dongle applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2009
Deepti Das Krishna
Abstract A compact ultra-wideband (UWB) printed slot antenna is described, suitable for integration with the printed circuit board (PCB) of a wireless, universal, serial-bus dongle. The design comprises of a near-rectangular slot fed by a coplanar waveguide (CPW) printed on a PCB of size 20 30 mm2. It has a large bandwidth covering the 3.1,10.6 GHz UWB band, with omnidirectional radiation patterns. Further, a notched band centered at 5.45 GHz wireless local area network bands is obtained within the wide bandwidth by inserting a narrow slot inside the tuning stub. Details of the antenna design are described, and the experimental results of the constructed prototype are presented. The time domain studies on the antenna shows a linear phase response throughout the band except at the notched frequency. The transient analysis of the antenna indicates very little pulse distortion confirming its suitability for high speed wireless connectivity. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1500,1504, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24385 [source]


A compact dual-band modified T-shaped CPW-fed monopole antenna

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2009
R. Sujith
Abstract A compact, dual band coplanar waveguide fed modified T-shaped uniplanar antenna is presented. The antenna has resonances at 1.77 and 5.54 GHz with a wide band from 1.47,1.97 GHz and from 5.13,6.48 GHz with an impedance bandwidth of 34% and 26%, respectively. Also the antenna has an average gain of 3 dBi in lower band and 3.5 dBi in higher band with an average efficiency of 90%. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 937,939, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24249 [source]


CPW-fed circularly polarized antenna for 3.5 GHz WiMAX band

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009
The Nan Chang
Abstract This article presents a new configuration of the common part of two unusually coupled open loops fed by a coplanar waveguide (CPW). For each open loop, the common part is in cooperation with one extended ground line of the CPW. The two loops are coupled to yield a wideband circularly polarized antenna for 3.5 GHz WiMAX band. Gain is enhanced through use of an outside ring. 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 849,851, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24172 [source]


Design of dual-band antenna with U-shaped open stub for WLAN/UWB applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2009
Jung N. Lee
Abstract In this article, we have proposed a dual-band antenna with U-shaped open stub for wideband local area network (WLAN)/ultra wideband (UWB) applications. The designed dual-band antenna consists of two semicircle radiating patches, a rectangular slot separating the two semicircles, one step for impedance matching, and coplanar waveguide (CPW) feeding. Two kinds of prototypes (CPW-fed UWB antenna and the dual-band antenna with U-shaped open stub) are fabricated and measured. Parametric studies and radiation characteristics for the two antennas are presented. The designed antenna has the figure-of-eight radiation pattern, wide bandwidth, and negligible dispersion over the operating frequency band. 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 284,289, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24033 [source]


Ultra-wideband folded loop antenna fed by coplanar waveguide

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2008
W. 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]


Compact ultrawideband square slot antenna with an asymmetric protruding stub

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2008
Jen-Yi Shiu
Abstract A new compact ultra-wideband (UWB) square slot antenna fed by a coplanar waveguide (CPW) is proposed. A large impedance bandwidth of more than 13 GHz (2.8,16 GHz) was obtained by asymmetrically widening the tuning stub that is extended from the signal strip of the CPW into the square slot. The larger and smaller widened parts of the asymmetric tuning stub can be easily adjusted to achieve good impedance matching in the lower and upper regions, respectively, of the entire VSWR , 2 band. The simple design procedure along with reasonably agreed measured and simulated results is presented. 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1776,1779, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23544 [source]


32-GHz dual-termination coupled CPW bandpass filter on HR-SI

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2008
Xi 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]


Enhanced bandwidth for a coplanar coupled-line balun design

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2007
Guan-Yu Chen
Abstract This letter presents a practical and simple uniplanar coupled-line balun with lower profile coplanar waveguide (CPW) structure to enhance the coupled coefficient and balanced output bandwidth for millimeter-wave operations. The CPW balun with a pair of symmetric quarter wavelength coupled lines is developed to increase at least 150% (1.5 times) bandwidth efficiency with a return loss better than the traditional planar coupled-line balun. The structure of the designed balun is simple, practical, and easy to fabricate. The measured results show fine agreements with the simulated data. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2902,2905, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22926 [source]


A circular CPW-FED slot antenna for broadband circularly polarized radiation

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2007
I-Chung Deng
Abstract The design of a circular slot antenna for obtaining broadband circularly polarized (CP) radiation using a coplanar waveguide (CPW) feed is presented. The operation of the proposed antenna is achieved by protruding metallic mono-strip from the circular ground plane towards the slot center at , = 0 and feeding antenna using a 50-, CPW with a protruded single strip at , = 270. In this design, the impedance bandwidth and 3 dB axial-ratio bandwidth can reach as large as 50 and 36%, respectively. The peak of antenna gain is about 3.9 dBi, with gain variations <1 dBi for the frequencies within CP bandwidth. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2728,2733, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22881 [source]


The band-notch function for a compact coplanar waveguide-fed super-wideband printed monopole

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2007
Xiao-Rong Yan
Abstract A compact rectangular monopole antenna fed by a tapered coplanar waveguide (CPW) with a band-notch function is proposed for super-wideband (SWB) applications. A U-shaped slot is cut in the radiation patch to obtain the band-notch function and its parameters are studied in detail. It is shown that the band-notched function can be realized by controlling the location of the U-shaped slot and the notched band can be changed by adjusting the length and the width of the slot. Experimental results demonstrate that the proposed antenna has a stop-band of 5.07,5.85 GHz and a super-wideband from 0.595 to 8.95 GHz (15:1) for VSWR ,2. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2769,2771, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22864 [source]


Miniaturized microstrip meander-line antenna with very high-permittivity substrate for sensor applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2007
Haiwen Liu
Abstract This article presents a compact microstrip meander-line antenna for sensor network applications in the 290 MHz band. The antenna is fed by coplanar waveguide and its dimension is 15 mm 15 mm 2 mm. Because of the use of a very high relative permittivity substrate (,r = 90) and meander-line structure simultaneously, the side length of the designed antenna is about ,g/12 (,g is the guided wavelength) so that the circuit size is reduced greatly. Measurements verify that the proposed antenna has bandwidth of 12% at the resonant frequency of 293 MHz. Also, the radiation patterns measured at resonance frequencies are very close to omnidirectional in the E-plane. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2438,2440, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22798 [source]


A CPW-fed staircase monopole UWB antenna with band-notched frequency in the WLAN band

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2007
Sang Joong Kim
Abstract A coplanar waveguide (CPW)-fed ultra-wideband staircase monopole antenna with a frequency-notch characteristic is presented. The proposed antenna consists of a planar four-step staircase rectangular monopole with a ground short-circuited stub, open stubs at the ground part, and two-step impedance transformer at the CPW-fed line. The impedance bandwidth is increased due to an offset feeding technique and one-side ground notch. The notched frequency band can be accomplished by means of the method that involves adding open stubs at the ground. The measured results are in good agreement with the simulated ones. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2545,2547, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22775 [source]


Compact printed semi-elliptical monopole antenna for super-wideband applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2007
Xiao-Rong Yan
Abstract A compact semi-elliptical patch antenna fed by a tapered coplanar waveguide is introduced for super-wideband (SWB) applications. The simulated and experimental results demonstrate that the antenna possesses the desirable SWB characteristics, achieving a ratio bandwidth of 19.7:1 for VSWR , 2, and exhibits a nearly omni-directional radiation pattern, while its area is only about 0.15,l 0.21,l, where ,l is the wavelength of the lowest operating frequency. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2061,2063, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22644 [source]


Compact UWB printed antennas for low frequency applications matched to different transmission lines

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2007
S. Tourette
Abstract A rectangular monopole antenna fed by microstrip, stripline, or coplanar waveguide is studied and enhanced to offer the widest bandwidth with minimum size. A particular attention is focused on ground plans design and coupling between patch and transmission line in order to maintain UWB characteristics and low profile whatever transmission line is used. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1282,1287, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22462 [source]


New micromachined interdigital coplanar waveguide

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2007
Xiaofeng Sun
Abstract A novel interdigital coplanar waveguide (CPW) has been designed and fabricated and its characteristics have been studied as a function of transmission line parameters. In this interdigital CPW, the ground conductors are thickened by micromachining techniques, which are helpful for reducing the interference between the adjacent parallel sections of center conductor. Within the frequency range from 5 to 20 GHz, the return loss of this structure has two minimal values whose positions change with the structural parameters. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1007,1010, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22336 [source]


Compact CPW-fed dual folded-strip monopole antenna for 5.8-GHz RFID application

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2006
Wen-Chung Liu
Abstract A coplanar waveguide (CPW)-fed monopole antenna with dual folded strips for the radio frequency identification (RFID) application is presented. The proposed antenna has a very compact size, with, including ground plane, only 14 8 mm2, and can operate at the 5.8-GHz band with measured impedance bandwidth and average antenna gain of 450 MHz and ,5.5 dBi, respectively, and also monopolelike radiation patterns. 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1614,1615, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21686 [source]


Tapered CPW-fed printed monopole antenna

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2006
Xian-Ling Liang
Abstract A compact coplanar rectangular monopole antenna fed by a tapered coplanar waveguide (CPW) feeder in the middle of a trapeziform ground plane is introduced. By using the tapered CPW feeder, the impedance bandwidth of the antenna is enhanced by a factor of about 1.7 times compared with a 50, CPW feeder. The measured ratio impedance bandwidth reaches about 10.7:1, covering frequencies from 0.76 to 8.15 GHz. 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1242,1244, 2006; Published online in Wiley Inter-Science (www.interscience.wiley.com). DOI 10.1002/mop.21666 [source]