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Feed Line (feed + line)
Selected AbstractsA 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 ultrawideband planar antenna with dual band-notched performanceMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2010Meng Zhang Abstract In this article, a novel and compact ultrawideband (UWB) planar antenna is presented. This antenna consists of an annular patch and a 50 , microstrip feed line. The 3.5/5.5 GHz dual band-notched characteristic gets achieved by etching a C-shaped slot in the patch and complimentary split ring resonator (CSRR) structure in the ground. The measured results show that the proposed antenna can achieve the voltage standing wave ratio (VSWR) requirement of less than 2.0 in very UWB frequency range from 3.05 to 23.8 GHz with dual band-rejection performance of 3.4 to 4.0 GHz and 4.92 to 6.0 GHz. Measured VSWR of the proposed antenna is in good agreement with the simulated result. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 90,92, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24856 [source] A wideband aperture-coupled microstrip antenna for S and C bandsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2009N. Ghassemi Abstract This article presents a multilayer aperture-coupled microstrip antenna with a nonsymmetric U-shaped feed line. The antenna structure consists of a rectangular patch which is excited through two slots on the ground plane. Experimental results show that the antenna has VSWR < 2 from 2.6 to 6.8 GHz (89%) and the gain of the structure is >7 dB from 2.7 to 4.5 GHz (50%). © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1807,1809, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24500 [source] Compact slot antenna for 2.4 GHz/UWB with dual band-notched characteristicMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2009Feng-Tao Zha Abstract A novel compact microstrip slot antenna for 2.4,2.5 GHz (WLAN) band and ultra-wideband is proposed and fabricated. Two single ring split resonators are etched in the feed line to obtain dual band-notched function in the 5 GHz WLAN band and ITU 8025,8400 MHz band, respectively. The entire antenna only occupies a volume of 33 mm × 35.5 mm × 1 mm. The proposed antenna is analyzed both numerically and experimentally. The measured results and simulated results reach good agreements. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1859,1862, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24475 [source] Bulk and patch ferrite resonator antennas based on the ceramic matrix composite: GdIGx YIG1- xMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2009P. B. A. Fechine Abstract In this study, the dielectric properties of the GdIGXYIG1,X ferrite composite material at radio frequency (RF) and microwave frequency bands were studied. These measurements were carried out in different sample geometries: thick films and cylindrical ceramic bulk ferrite resonator. In the RF range, we observed that the material is rather stable because of its short changes as a function of temperature and frequency range. The temperature capacitance coefficient values for all the samples (thick films and cylindrical ceramic bulk samples) presented short positive values at the RF range. The GdIG0.5YIG0.5 thick film was used as a substrate for the microstrip antenna device, where the upper Ag electrode served as a circular patch antenna and a microstrip line was used as a feed line. The microstrip antenna operates in this configuration at 8.185 GHz. In the study of the dielectric properties of the composites antenna geometry, with the same ferrite composite, a bulk cylindrical geometry was investigated. A numerical study, together with the experimental, was done, and the dielectric characteristics of the composite like ,r, tg,E, and ,r were obtained. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1595,1602, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24395 [source] Novel band-notch UWB antenna design with slit ground planeMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2008Chow-Yen-Desmond Sim Abstract A newly designed microstrip feed, octagonal-shaped ultra-wideband printed antenna is proposed. The UWB operation within the required 3.1,10.6 GHz band is achieved by simply embedding in the ground plane a small rectangular slit, located below the feed line of an octagonal patch. With the dimensions (length and height) of the slit carefully tuned, a notched band of around 5.1,6.4 GHz can be achieved, without applying the commonly recommended techniques of loading the radiating patch with a slot or an open-ended slit. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2229,2233, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23621 [source] A discussion on the performance of impedance matched antenna system and considerations for a better performanceMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2008Adnan Kaya Abstract Impedance matching networks are used extensively in radio communications. In this study, ,-matching circuit has been used as a matching network. The return loss level of several impedance matched microstrip antennas are compared as a function of matching techniques. The ,-matching device is used to construct the antenna tuning units, which is only used to match the front module and the antenna. This circuit impedance region has been investigated analytically under the variable load condition. When the mismatch is occurred, the result is an increase in the energy consumption or transmission quality deterioration. In addition, the input module in antenna system could be damaged if reflection of the signal levels is excessively high. This is interesting application because antennas cannot be considered alone as component with changing electromagnetic properties. The rectangular microstrip antenna was designed at 2.5 GHz frequency by using microstrip feed line. Better return loss level which is ,16.86 dB has been obtained for this antenna using ,-matching circuit. It is shown that theoretical, simulation, and laboratory results are good agreement. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 410,415, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23101 [source] Design of a V-shaped surface-mounted monopole array antenna for DCS/PCS operationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2007Jean-Marie Floc'h Abstract In this paper, a surface-mountable, reconfigurable monopole antenna was designed for array antenna operations in the DCS-1800 and PCS-1900 bands. First, the elementary structure was obtained by folding a metallic strip into a V-shape, and then soldered to a 50-, microstrip feed line printed on a metallized substrate. For the optimized structure, an impedance bandwidth of 22.7%, corresponding to the frequency range 1560,1960 MHz, was obtained. Measured radiation patterns are similar to that of a monopole antenna, and the maximum measured gain is about 1.8 dBi at 1.6 GHz. Next, this elementary antenna was used for realization of both linear- and planar-array antennas. The linear-array shows a dual and wideband behavior with good impedance matching and asymmetric radiation patterns, whereas the planar-array presents a unique resonant band with moderate adaptation and symmetric radiation patterns. The measured gain for the two arrays is about 5 dBi. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1486,1491, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI.10.1002/mop.22437 [source] Microstrip dual-band bandpass filter using slow-wave resonators for WLAN applicationsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007Xuehui Guan Abstract A dual-band bandpass filter using microstrip slow-wave resonators is developed for wireless local area network applications. The fundamental and higher order resonant harmonics of a microstrip open-loop resonator are analyzed against the length of the loading open stub. Then a dual-band bandpass filters is designed in the form of slow-wave open-loop resonators. A zero-degree feed structure is employed to produce transmission zeros near the passband to increase the rate of attenuations, and a quarter-wavelength feed line for impedance matching is added to get desired external quality factor at the input and output. The theoretical analysis and design procedures are successfully verified by experimental results. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 14,16, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22055 [source] An improved design of harmonic suppression for microstrip patch antennasMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007M. K. Mandal Abstract Harmonic suppression is an important factor for active microstrip patch antennas radiating harmonic frequencies. Here, a novel compact low pass filter (LPF) having high filter selectivity and wide stop band is used on the microstrip feed line of the patch antenna. The 15 dB LPF stopband exist over 10 GHz while implementing area is 0.1464,g × 0.1789,g at the cutoff frequency of 3.55 GHz. The fundamental antenna operating frequency falls in the passband of the LPF. The other harmonics falls in the LPF stopband and thus attenuated. An example shows up to fourth harmonic are suppressed while total occupying area remains compact. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 103,105, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22049 [source] Band-notched ultra-wideband square slot antennaMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2006Horng-Dean Chen Abstract An ultra-wideband (UWB) square slot antenna with a band-notched characteristic is presented. The proposed antenna has a simple configuration and is easy to construct. The ultra-wideband operation is realized by loading an offset rectangular stub at the end of the microstrip feed line. The band-notched characteristic is achieved by embedding an U-like slot in the rectangular stub. The notched frequency band can be controlled by adjusting the length of the U-like slot. A design example for an UWB (3.1,10.6 GHz) square slot antenna with a notched frequency band at 5 GHz is demonstrated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2427,2429, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21966 [source] Circularly polarized broadband high-efficiency active integrated antennaMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2006S. Gao Abstract This letter presents a circularly polarized (CP) broadband high-efficiency active integrated antenna, where the broadband CP antenna is integrated directly with a broadband high-efficiency class-E power amplifier (PA). To achieve CP operation, a series feed using an L-shaped microstrip feed line below the ground plane is used to provide a 90° phase shift between crossed slots. The antenna serves both functions of a broadband CP radiator and a broadband harmonics-termination load network for the class-E PA. Measures results demonstrate both broadband CP radiation and high efficiency. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2145,2148, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21940 [source] Broadband elliptical dielectric resonator antennaMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2006P. V. Bijumon Abstract A broadband low-loss elliptical dielectric resonator antenna (DRA) excited by using the microstrip-line technique is proposed. The effect of geometrical modifications of the microstrip feed line on the gain, bandwidth, and radiation performances of the antenna has also been investigated. The proposed antenna offers enhanced radiation characteristics compared to conventional microstrip-patch antennas. © Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 65,67, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21262 [source] Microstrip dual-band bandpass filters using parallel-connected open-loop ring resonatorsINTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2008Lung-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] Design of the wideband dual-mode bandpass filter using stepped impedance resonatorsMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2008Cheng-Yuan Hung Abstract In this letter, a novel dual-mode bandpass filter (BPF) using stepped impedance resonators (SIRs) for simultaneous low insertion-loss and wide passband has been designed. This novel wideband dual-mode BPF is formed by a microstrip square ring resonator with direct-connected orthogonal feed lines, and two impedance steps as perturbations. By varying the impedance ratio (K) of the SIRs, the wideband bandwidth can be tuned with more freedoms. The design procedure using the analysis of even and odd mode is described in this paper. The wideband BPF with relative bandwidth of 76.5% is simulated using the full wave electromagnetic simulation, and then fabricated and measured using the network analyzer. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1104,1107, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23281 [source] Miniaturized two-pole DC-block semicircular-patch bandpass filter using spur-linesMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2008Haiwen Liu Abstract A miniaturized two-pole semicircular-patch bandpass filter (BPF) with spur-lines is introduced in this letter. Compared to the use of conventional feed lines, a reduction of 48% in the fundamental resonant frequency of the proposed BPF is achieved after adopting the orthogonal feed lines. Furthermore, the degenerate modes located at 5.14 GHz and 5.25 GHz can be excited by adding spur-line structure. Besides, the gap between the semicircular-patch resonators offers DC blocking. Finally, the simple and compact two-pole BPF is demonstrated by measurements. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 210,213, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23027 [source] Low-loss triangular-patch dual-mode bandpass filter with slotted input/outputMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007Haiwen Liu Abstract Without any perturbations on the surface of the patch resonator or orthogonal feed lines, a novel microstrip dual-mode triangular-patch bandpass filter with slotted I/O is introduced in this letter. The degenerate modes are excited by the use of the slotted I/O. Also, the coupling characteristics of two degenerate modes are studied with respect to main design parameters. A dual-mode filter with 0.8 dB insertion loss in the passband was designed and fabricated. Measurement verify the validity of the proposed design method. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 147,149, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22072 [source] Investigation of new dual-mode triangular-patch bandpass filters using spur-linesMICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2006Hai-wen Liu Abstract Without any perturbations on the surface of the patch resonator or orthogonal feed lines, new microstrip dual-mode triangular-patch bandpass filters are presented in this article. The degenerate modes are excited by the use of the spur-lines for input/output microstrip lines. Also, the influence of design parameters on the frequency characteristics of the proposed dual-mode filters is discussed. In addition, a modified dual-mode filter using double-spur-lines is introduced and simulated. Measurement verifies the validity of the introduced design method. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2100,2103, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21880 [source] An over-current protection module for telephone network line cards,an analysis of electro-thermal propertiesQUALITY AND RELIABILITY ENGINEERING INTERNATIONAL, Issue 5 2002Marina Santo Zarnik Abstract In this paper the results of a finite-element analysis of the electro-thermal behaviour of an over-current protection thick-film hybrid module are presented. The module was designed for protecting the line card of a telephone network against an abnormal surge of current, resulting from accidental shorts between adjacent power feed lines. The switching time of the device is crucial to its effectiveness as a protective element. A transient finite-element thermal analysis was performed in order to predict the dynamic temperature states at the critical points of the circuit design and to evaluate the influence on the switching characteristics. A comparison between simulated and practical results is given. Copyright © 2002 John Wiley & Sons, Ltd. 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