國立臺南大學專任教師基本資料
姓名王健仁
系所電機工程學系
職稱教授
校內分機7775
EMAILcjwang@mail.nutn.edu.tw
辦公室C203-2
網址 https://www.facebook.com/CJLab
專長/研究領域天線、射頻/微波元件與電路
學位畢業學校國別主修學門修業期間
學士國立中山大學中華民國電機工程學系1989/09~1993/6
博士國立交通大學中華民國電信工程1996/09~2000/06
服務機關部門系所職稱服務期間
工研院電通所工程師1998/08~1999/08
明基電通無線通訊事業本部研究員2000/08~2001/01
南台科技大學電子系助理教授2001/02~2001/07
逢甲大學電機系助理教授2001/08~2004/07
逢甲大學電機系副教授2004/08~2006/07
國立臺南大學電機系副教授2006/08~2009/07
著作名稱:A Simple CPW-Fed Monopole Antenna with Reconfigurable CP Frequency and Radiation Pattern
年度:2018
類別:期刊論文
摘要:In this work, several techniques are presented to switch operated bandwidth and circularly polarized pattern of the coplanar waveguide (CPW)-fed monopole antenna. A fork-like conducted strip monopole is utilized for the radiating element. Two p-i-n (PIN) diodes are embedded in the antenna structure to realize the switchable capability of frequency band and circular polarization. By electronically turning on or off these diodes, a right-hand circularly polarized (RHCP) wave at 1.57 GHz for the global positioning system (GPS) is not only generated, but a left-hand circularly polarized (LHCP) wave at 2.33 GHz for satellite digital audio radio (SDAR) service system is also achieved. Measured results show that the 3-dB axial ratio (AR) bandwidths are 110 MHz (1.49–1.60 GHz, 7.1%) around 1.57 GHz and 70 MHz (2.29–2.36 GHz, 3.0%) around 2.33 GHz, whereas the impedance bandwidths are 430 MHz (1.38–1.81 GHz) and 670 MHz (2.05–2.72 GHz).
關鍵字:Monopole antenna, circular polarization, Faraday’s rotation effect, multi-path interference, frequency-reconfigurable, polarization-reconfigurable, surface current distribution.
著作名稱:Methods of Suppression of Cross-Polarized Power for the CPW-Fed Monopole Antenna
年度:2017
類別:期刊論文
摘要:In this paper, we propose several techniques for radiation characteristics improvement of a coplanar waveguide (CPW)-fed monopole antenna with an asymmetric ground plane. Although utilization of an asymmetric ground plane provides wideband impedance characteristics, the cross polarization of the monopole antenna increases, resulting from the unbalanced horizontal currents of the ground plane. The proposed techniques, which include: etching a notch at the feedline; embedding a slot array in the ground plane; and adding several conducting strips on the top and bottom planes; are used to suppress cross-polarized power. From the simulated and measured results, it can be observed that the ratios of the maximum co-polarized power to the maximum cross-polarized power have been enhanced at the operating bands. The mechanisms of cross-polarization suppression are explained by using current density distributions.
關鍵字:asymmetric ground plane, cross-polarization, grating strip, slot array
著作名稱:A Microstrip Wideband Monopole Antenna for Multi-System Integration by Utilizing Stepped-Impedance Structure and L-Shaped Slot
年度:2017
類別:期刊論文
摘要:In this paper, a coplanar-waveguide (CPW)-fed dual-band antenna for applications of the multi-system integration has been demonstrated. The resonance analysis of the stepped-impedance (SI) monopole is presented by using the transmission-line analysis method. The frequency-response characteristics of the SI-monopole, such as the resonance condition and harmonic response, are systematically summarized. Furthermore, utilizing several simple techniques, such as bent feeding topology, asymmetric ground plane, and an L-shaped slot etched in the ground plane, a right-hand circularly polarized (RHCP) radiating wave at 1.57 GHz and a left-hand circularly polarized (LHCP) radiating wave at 2.33 GHz are excited for the applications of the global positioning system (GPS) and the satellite digital audio radio (SDAR) service system. After optimization of the geometrical parameters of the proposed antenna, the measured impedance bandwidths of a reflection coefficient - 10 dB range from 1.40 to 2.98 GHz and from 4.48 to 6.27 GHz, and thus covers most of the commercial wireless communication systems, such as GPS, digital cellular system (DCS), personal communication system (PCS), international mobile telecommunications (IMT)-2000, wireless local area networks (WLAN), and long-term evolution (LTE) 2300/2600. The measured 3-dB axial ratio (AR) bandwidths are about 80 MHz at 1.57 GHz and 100 MHz at 2.33 GHz.
關鍵字:axial ratio, harmonic response, resonance condition, stepped impedance
著作名稱:A Low-Pass Filter Based on the Slotted-Ground-Plane Horn-Shaped Resonato
年度:2016
類別:期刊論文
摘要:Designs of a miniaturized low-pass filter (LPF) using the slotted-ground-plane resonator are introduced in this paper. The proposed filter consists of a horn-head slot in the ground plane, two modified arc-head resonators, and a parasitic patch connected at the microstrip line. The horn-head slot, which is a modified type of a horn-shaped slot, provides good band-stop characteristics. To enhance rejection performance, a pair of the modified arc-head slot is embedded inside the hornhead resonator to increase additional transmission zeros into frequency characteristics. Furthermore, a parasitically circular patch is added at the microstrip line for frequency reduction and rejection enhancement. The surface current distributions are presented to explain the resonance mechanism. For the proposed LPF, the measured rejection bandwidth over ¡20 dB is from 1.75 to 12.0 GHz.
關鍵字:arc-head slot, horn-head slot, slotted-ground-plane resonator, transmission zero
著作名稱:Design of Dual-Band Circular Polarization for the Monopole Antenna by Utilizing Triple-Strip Topology
年度:2016
類別:期刊論文
摘要:The design and performance of a dual-band circularly polarized monopole antenna for multisystem integration are shown in this paper. A triple-strip monopole structure, which is fed at the microstrip line, is designed and fabricated to excite several resonances. After optimization of the geometrical parameters of the antenna, the resonances are merged, and thus a wide impedance bandwidth is obtained. The measured impedance bandwidth of a S11 210 dB ranges from 1.43 to 3.29 GHz, and covers most of commercial wireless communication systems. A right-hand circularly polarized wave at 1.57 GHz for the global positioning system is not only excited, but a left-hand circularly polarized wave at 2.33 GHz for satellite digital audio radio service system is also generated. The 3-dB axial ratio bandwidths are about 70 MHz at the lower band (1.57 GHz) and 60 MHz at the upper band (2.33 GHz). Both of simulated and measured results are shown to validate the impedance and CP characteristics of the proposed monopole antenna.
關鍵字:triple-strip topology; circular polarization; current distribution; axial ratio
著作名稱:Microstrip Open-Slot Antenna with Broadband Circular Polarization and Impedance Bandwidth
年度:2016
類別:期刊論文
摘要:A design with broadband and circularly polarized radiation from an open-slot antenna has been successfully demonstrated in this work. The proposed antenna, which consists of an open slot and a patch-protruded feeding topology, provides a large bandwidth, which covers the operation bandwidth of a satellite digital audio radio (SDAR) service system. The open slot is formed by an L-shape conducted strip asymmetrically connected at the edge of the ground plane. After optimization, the final structure which measured 3 dB axial-ratio bandwidth for left-hand circular polarization (LHCP) is 2.47 GHz (76%) from 2.00 to 4.47 GHz; meanwhile, the measured impedance bandwidth of a reflection coefficient - 10 dB ranges from 1.22 to 5.97 GHz, a 4.75-GHz impedance bandwidth (133 %).
關鍵字:Axial ratio (AR), circular polarization (CP), impedance bandwidth, open-slot antenna.
著作名稱:Analysis of the Mallet-Like Slotted-Ground-Plane Resonator
年度:2015
類別:期刊論文
摘要:The frequency response characteristics, such as resonance condition and spurious harmonic, of a mallet-like slotted-ground-plane resonator have been shown in this work. Unlike the conventional slotted-ground-plane resonator with a half wavelength, the length of this proposed structure is only quarter-wavelength long so that compactness can be achieved. The technique of size reduction for the resonator is furthermore presented by modifying the impedance ratio of the mallet-like slot segments. Owing to the semi-ground plane, decrease of the quality factor causes enhancement of the rejection bandwidth. We analytically derive design equations with respect to the impedance ratio of the mallet-like slot resonator and can predict resonant modes without utilizing EM simulation software. In addition, by utilizing the thru-reflect-line calibration technique and theoretical methods, parameter extraction of the equivalent circuit of the mallet-like open-slot resonator is presented.
關鍵字:slotted-ground-plane resonator; impedance ratio; TRL calibration;
著作名稱:Modeling of Stepped-Impedance Slot Antenna
年度:2014
類別:期刊論文
摘要:In this study, the resonant analysis and modeling of the microstrip-fed stepped-impedance (SI) slot antenna have beenare presented by utilizing the transmission-line and lumped-element circuit topologies. This study analyzed analyzes the SI- slot antenna and systematically summarized summarizes its frequency response characteristics, such as the resonance condition, spurious response, and equivalent circuit. Design formulas with respect to the impedance ratio of the SI slot antenna were analytically derived. The antenna designers can predict the resonant modes of the SI slot antenna without utilizing expensive EM- simulation software.
關鍵字:Stepped-impedance slot antenna, equivalent circuit, spurious response, electric length.
著作名稱:CPW-Fed Monopole Antenna for Multiple System Integration
年度:2014
類別:期刊論文
摘要:In this work, a coplanar-waveguide (CPW)-fed monopole antenna for multiple wireless communication system integration is developed. A rectangular monopole antenna and a feeding structure are fabricated on the same plane of the substrate to simplify circuit processing and position alignment. Simply tuning one of the CPW ground-plane widths, which results in an asymmetrical ground plane structure, enhances the impedance bandwidth and excites the circular polarization at 1.57 GHz. To cover the operation bandwidth of the wireless local area network (WLAN) system, a parasitic inverted-L radiating strip is shorted to the ground plane. The measured impedance bandwidth of a S11-10 dB ranges from 1.37 to 2.82 GHz, and thus covers most commercial wireless communication systems, such as GPS, DCS, PCS, IMT-2000, WLAN, and LTE. The measured 3-dB axial-ratio bandwidth is about 3.8 % with respect to 1.56 GHz.
關鍵字:Circular polarization, asymmetrical ground plane, multi-path interference, axial ratio
著作名稱:A Dual-band Monopole Antenna for UHF-Band Applications
年度:2014
類別:期刊論文
摘要:A dual-band monopole antenna for UHF-band applications has been demonstrated in this work. The dual-band characteristics are achieved using several strip monopole radiators. In addition, a small planar inverted-F monopole antenna (PIFMA) is connected to the ground plane. The bandwidth improvement for the antenna is obtained mainly by modifying the geometrical configuration of the strip monopoles added at the antenna and the ground plane. The measured results of the impedance-bandwidth are about 44 MHz (458 to 502 MHz) and 118 MHz (701 to 819 MHz).
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著作名稱:Design of the Small Low-Pass Filter by Utilizing the Slotted-Ground-Plane Resonator
年度:2013
類別:期刊論文
摘要:In this article, a new design for the compact low-pass filter (LPF) with a wide rejection band is presented by utilizing the slottedground- plane (SGP) structure. A modified-p slot is etched in the ground plane to excite three different resonant modes. A wide rectangular stub, which overlaps the connection slots, connects to the microstrip transmission line. This technique significantly enhances the rejection characteristics. A reversed-C slot is embedded inside the modified-p slot to lower the initial resonant frequency of the LPF. In particular, two shorted quarterwavelength branch slots are used to generate two transmission zeros such that the high-frequency rejection performance can improve. An equivalent resistor, inductor, capacitor (RLC) circuit is proposed to model the introduced LPF and corresponding RLC parameters are extracted. A fabricated filter rejects the signals at the frequencies from 1.97 to 12.0 GHz with more that 20-dB suppression.
關鍵字:filter; slotted-ground-plane structure; transmission zero
著作名稱:A Wideband Stepped-Impedance Open-Slot Antenna with End-Fire Directional Radiation Characteristics
年度:2013
類別:期刊論文
摘要:In this paper, new techniques are proposed to increase the front-to-back ratio of the stepped-impedance (SI) open-slot antenna for operation from 1.67 GHz to 4.25 GHz, covering the required frequency bands of the wireless communications systems, such as DCS, PCS, IM-2000, and WLAN. By designing a stubprotruded feedline and adding two symmetrical stubs at the edge of a quarter-wavelength slot, additional capacitance is introduced to the resonator. Hence, the impedance-matching condition of the SI openslot antenna is not only effectively improved, but also the resonance frequency of the slot antenna is significantly shifted down and then an improvement in impedance bandwidth is achieved. In order to decrease the back radiation, two pairs of symmetrical open slots with uniform width are etched at the back of the blocking open slot such that the currents along the longitudinal edges of the ground plane cannot flow to the back direction. In addition, by embedding an array of seven slits beside the radiating slot, the back lobe at the upper frequency bands can be reduced. Two pairs of three-element metal strips are utilized as a power director to increase the forward power and enhance the front-to-back ratio of the SI open-slot antenna. Compared to conventional unidirectional radiation antennas, the proposed antenna demonstrates improved wideband unidirectional radiation characteristics and relatively smaller size.
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著作名稱:Mode Discussion of the Microstrip Traveling Antenna
年度:2013
類別:期刊論文
摘要:This work examines the resonant-mode analysis of the microstrip traveling antenna (or calling the leaky-wave antenna). Considering the traveling antenna as an open-end structure, the antenna embodiment can be analyzed by utilizing the cavity-mode analysis. In order to understand the resonant characteristics of the traveling antenna, we use two traditional traveling antennas with two different lengths. The corresponding relationship between the resonant modes for the short and long antennas is derived. The radiation mechanism of the antenna is also explained with aid of the equivalent magnetic current density. The antenna designers can predict the resonant modes of the traveling antenna without utilizing expensive EM simulation software.
關鍵字:None
著作名稱:A CPW-Fed Open-slot Antenna for Multiple Wireless Communication Systems
年度:2012
類別:期刊論文
摘要:In this letter, a wideband coplanar waveguide (CPW)-fed open cross-slot antenna with both linear and circular polarizations has been designed. By etching a modified open cross-slot in the ground plane, two orthogonal electric fields with a quadrature phase difference excited a circularly polarized wave at 2.34 GHz. The characteristics of the moderate impedance bandwidth resulted from the merging of three resonant modes into a wide band. The measured impedance bandwidth of return loss dB ranged from 1.69 to 2.78 GHz.
關鍵字:Circular polarization, modified open cross-slot,orthogonal electric field.
著作名稱:Enhancement of Pattern Directivity for the Open Slot Antenna by Utilizing Array Topology
年度:2012
類別:期刊論文
摘要:In this article, a new design for the open slot antenna with a high front-to-back gain ratio is proposed and presented. By utilizing a two-element array topology, a power combination is achieved and a unidirectional radiation pattern is derived. To suppress the backward radiating power, a pair of symmetrical notched slits with uniform width is etched such that the currents distributing along two longitudinal edges of the ground plane cannot flow backward. In addition, three arrays of eight-element metal strips are utilized as a power director to increase the forward power and improve the front-toback ratio of the antenna. From the measured results, the proposed antenna topology demonstrates a front-to-back (F/B) ratio of 22.3 dB and possesses superior end-fire radiating characteristics.
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著作名稱:A Wideband Loop-Like Monopole Antenna with Circular Polarization
年度:2011
類別:期刊論文
摘要:A new design of broadband monopole antenna with circular polarization (CP) is shown. The broadband characteristics are achieved using a microstrip-fed rectangular dual-loop monopole configuration and an asymmetrical feeding structure. The improvement of CP for the antenna is obtained mainly by the separation between the monopole antenna and the ground plane. The measured result of the impedance-bandwidth is about 3.66 GHz from 0.98 to 4.64 GHz; the 3-dB axial ratio bandwidth is about 180 MHz at the lower band (1.5 GHz). The antenna is extremely low cost and does not require any truncation corner, reflector surface, or via connections, all of which increase the fabrication cost.
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著作名稱:A CPW-Fed Wideband Spiral Slot Antenna with Circular Polarization
年度:2010
類別:期刊論文
摘要:A new design of broadband slot antenna with circular polarization is presented. The broadband characteristics are achieved using a coplanar-waveguide (CPW)-fed two-arm spiral slot configuration. The spiral slot antenna and the feeding structure are fabricated on the same plane of the substrate so that the circuit process and the position alignment could be simplified. The improvement of circular polarization for the antenna is obtained mainly by an arc slot surrounding the spiral slots. The turn number of the spiral slots and the geometrical dimensions of the arc slot are varied in order to derive the better performance of the circular polarization. The measured impedance bandwidth of a S11-10 dB ranges from 1.25 to 8 GHz and covers most of the commercial wireless communication systems, such as GPS, DCS, PCS, IMT-2000, WLAN and HiperLAN. The measured 3-dB axial-ratio bandwidth (ARBW) is 10.6 % with respect to 1.605 GHz.
關鍵字:CPW-fed, spiral slot, circular polarization, axial-ratio bandwidth
著作名稱:A Compact Wideband Leaky-Wave Antenna with Etched Slot Elements and Tapered Structure
年度:2010
類別:期刊論文
摘要:A compact wideband leaky-wave antenna (LWA) with etched slot elements and tapered structure is studied. The proposed antenna is composed of an asymmetric-fed multi-section tapered short leaky-wave antenna with two embedded slots and a ground plane with etched slot elements. Base on the concept of LWA, the asymmetric-fed is utilized to excite the first higher order mode. By etching slot elements on the ground plane, the current distribution of this antenna can be influenced to compact the width of conventional LWA. In order to achieve the impedance matching, this multi-section tapered short leaky-wave antenna is embedded with two rectangular slots. This technique not only improves the impedance matching but also suppresses the back lobe. According to the measured results, the impedance bandwidth achieves about 1.30 GHz for 7-dB return loss, which covers the range from 3.30 to 4.60 GHz, and the scanning angle of the measured main beam is about 36°, which covers the range from 17° to 53°. This short LWA is only about 1.14 λB0B at 3.4 GHz, and the back lobe can be suppressed by 7.5 dB at 4.3 GHz. Due to the etched slot elements on the ground plane, the frequency of the radiation angle is shifted to lower frequency by 750 MHz, which can compact the width of LWA by more than 20 %.
關鍵字:Leaky-wave antennas, frequency scanning, back lobe, cutoff frequency.
著作名稱:CPW-fed Two-Arm Spiral Slot Antenna
年度:2009
類別:期刊論文
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著作名稱:Novel Broadband Monopole Antennas with Dual-Band Circular Polarization
年度:2009
類別:期刊論文
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著作名稱:CPW-Fed Stair-Shaped Slot Antennas with Circular Polarization
年度:2009
類別:期刊論文
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著作名稱:A Compact DGS Resonator with Improvement of Q Factor
年度:2008
類別:期刊論文
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著作名稱:New CPW-Fed Monopole Antennas With Both Linear And Circular Polarisations
年度:2008
類別:期刊論文
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著作名稱: Technique of Bandwidth Enhancement for the Slot Antenna
年度:2008
類別:期刊論文
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著作名稱:Studies on Dual-Band Multi-Slot Antennas
年度:2008
類別:期刊論文
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著作名稱: Circularly Polarized Quasi-loop Antenna
年度:2008
類別:期刊論文
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著作名稱:A Frequency-Dependent Pattern-Switching Wideband Slot Antenna
年度:2006
類別:期刊論文
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著作名稱:Miniaturized Dual-mode Triangular Patch Filter with Inverted V-shaped Slot
年度:2006
類別:期刊論文
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著作名稱:CPW-fed Band-Selective Filter for Wideband Antenna
年度:2006
類別:期刊論文
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著作名稱:A Slot Antenna Module for Switchable Radiation Patterns
年度:2005
類別:期刊論文
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著作名稱:Studies of Suppression of the Reflected Wave and Beam-scanning features of the Antenna Arrays
年度:2005
類別:期刊論文
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著作名稱:“Experimental Studies of a Miniaturized CPW-Fed Slot Antenna with the Dual-Frequency Operation
年度:2004
類別:期刊論文
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著作名稱:A Microstrip Filter Utilized in the Ultra-Wideband Antennas
年度:2004
類別:期刊論文
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著作名稱:A Dual-Band Network of the Feeding Module Utilized in Applications of the Antenna Diversity
年度:2004
類別:期刊論文
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著作名稱:Studies of the Microstrip Monopole Antenna with the Windowed Ground Plane
年度:2004
類別:期刊論文
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著作名稱:Studies of the Novel CPW-Fed Spiral Slot Antenna
年度:2004
類別:期刊論文
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著作名稱:Microstrip Small Antennas for Mobile Communication
年度:2004
類別:期刊論文
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著作名稱:Ultra-Wideband (UWB) Antennas for Multi-System Integration
年度:2004
類別:期刊論文
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著作名稱:Suppression of Reflected Wave of Leaky-Wave Antenna By Utilizing Microstrip-Fed Slot Antennas
年度:2003
類別:期刊論文
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著作名稱:Small Helical Antenna for the Applications of the Dual ISM Bands
年度:2003
類別:期刊論文
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著作名稱:A Stair-Shaped Slot Antenna for the Triple-Band WLAN Applications
年度:2003
類別:期刊論文
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著作名稱:Two-Dimensional Scanning Leaky-Wave Antenna By Utilizing the Phased Array
年度:2002
類別:期刊論文
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著作名稱:A Frequency-Reduction Scheme for Spiral Slot Antenna
年度:2002
類別:期刊論文
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著作名稱:A Beam Forming Technique for Leaky-wave Antenna
年度:2001
類別:期刊論文
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著作名稱:An Active Dual-Beam Leaky Wave Antenna with Asymmetrically Scanning Capability
年度:2001
類別:期刊論文
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著作名稱:A Dual-Beam Asymmetrically Scanning Leaky-Wave Antenna By Utilizing A HEMT Resistive Up-converter
年度:2001
類別:期刊論文
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著作名稱:Beam-Switchable Scanning Leaky-Wave Antenna
年度:2000
類別:期刊論文
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著作名稱:Scanning Leaky-Wave Antenna Integrated With Self-Oscillating Doubler
年度:1999
類別:期刊論文
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著作名稱:Radiation Characteristics of Active Frequency-scanning Leaky-mode Antenna Arrays
年度:1999
類別:期刊論文
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著作名稱:Compact Microstrip Meander Antenna
年度:1999
類別:期刊論文
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著作名稱:A Novel Two-beam Scanning Leaky-wave Antenna
年度:1999
類別:期刊論文
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著作名稱:Active Dual-Beam Aperture-Coupled Leaky-Wave Antenna
年度:1999
類別:期刊論文
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著作名稱:Active Frequency-Tune Beam Scanning Leaky-wave Antenna Arrays
年度:1998
類別:期刊論文
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著作名稱:Asymmetric Feeding Active Leaky-wave Antenna Arrays
年度:1998
類別:期刊論文
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著作名稱:X-band Active Two-terminal Leaky-wave Antenna
年度:1998
類別:期刊論文
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著作名稱:A New Two-terminal Active Leaky-wave Antenna
年度:1998
類別:期刊論文
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著作名稱:Coplanar Waveguide to Coplanar Strips Fed Active Leaky-wave Antenna
年度:1998
類別:期刊論文
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著作名稱:A CPW-Fed Microstrip Fork-Shaped Antenna with Dual-Band Circular Polarization
年度:2016
類別:期刊論文
摘要:This paper presents a microstrip wideband antenna and its utilization in integration of multiple wireless communication systems. A simple fork-like strip antenna, fed by a coplanar-waveguide (CPW) transmission line, is designed to excite a right-hand circularly polarized wave at 1.57 GHz. A rectangular patch is added at the end of one prong to enhance the circular polarization performance. By modifying the geometry of the ground plane, a left-hand circularly polarized wave is excited at 2.33GHz, and the wideband frequency response is derived. To reduce the lower resonant frequency, a stub is added at the left side of the ground plane. The measured impedance bandwidth of reflection coefficients (S11) −10 dB ranges from 1.49 to 2.92 GHz, which satisfies the system bandwidths of most of commercial wireless communication systems. The 3-dB axial-ratio bandwidths are approximately 40MHz at the lower band (1.57 GHz) and 290 MHz at the upper band (2.33GHz).
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著作名稱:Design and Analysis of a Low-Pass Filter Utilizing a Slotted-Ground-Plane Resonator
年度:2018
類別:期刊論文
摘要:In this article, the frequency-response analysis of an H-shaped slot resonator etched in the ground plane is shown by using transmission-line analysis and even-and-odd mode analysis. Based on a stepped-impedance structure, we systematically derive a resonance analysis of the slot resonator, addressing resonance conditions, and harmonic responses. The design rule of the slotted-ground-plane resonator was successfully derived. The design equations and figures regarding the impedance ratio of the H-shaped slot resonator have been analytically proven so that the resonant modes can be predicted without electromagnetism simulation software. Aided by the proposed design procedure, we demonstrate a low-pass filter (LPF) with a unit-cell topology, which consists of a uniform-impedance transmission line, an H-shaped slot resonator, and two C-like slot resonators which are also designed with the same design rule. By embedding the two C-like slot resonators inside the H-shaped slot resonator, several additional transmission zeros are excited in frequency characteristics so that the device achieves wideband rejection performance. Finally, to enhance the frequency characteristics of the LPF, a modified case is also presented by adding a rectangular stub at the transmission line.
關鍵字:even-and-odd mode analysis, frequency response, slot resonator, transmission-line analysis
著作名稱:Bandwidth Enhancement Technique of the Meandered Monopole Antenna
年度:2015
類別:期刊論文
摘要:A small dual-band monopole antenna with coplanar waveguide (CPW) feeding structure is presented in this paper.The antenna is composed of ameandered monopole, an extended conductor tail, and an asymmetrical ground plane. Tuning geometrical structure of the ground plane excites an additional resonant frequency band and thus enhances the impedance bandwidth of the meandered monopole antenna. Unlike the conventional monopole antenna, the new resonant mode is excited by a slot trace of the CPW transmission line.The radiation performance of the slot mode is as similar as that of the monopole.The parametrical effect of the size of the one-side ground plane on impedance matching condition has been derived by the simulation. The measured impedance bandwidths,which are defined by the reflection coefficient of −6 dB, are 186MHz (863–1049MHz, 19.4%) at the lower resonant band and 1320MHz (1490–2810MHz, 61.3%) at the upper band. From the results of the reflection coefficients of the proposed monopole antenna, the operated bandwidths of the commercial wireless communication systems, such as GSM900, DCS, IMT-2000, UMTS,WLAN, LTE 2300, and LTE 2500, are covered for uses.
關鍵字:monopole antenna ,coplanar waveguide, slot mode
著作名稱:A Microstrip Antenna Utilized in Wireless Communication Systems
年度:2005
類別:期刊論文
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