IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)最新文献
The purpose of this study is to investigate input and radiation characteristics of antennas due to parameters of the dielectric cylindrical radome. Sector antennas occupy an important position in base station antennas. It is necessary to investigate the radome effect for sector antennas. In this paper, we investigate the input and radiation characteristic of a 2 GHz band 120/spl deg/ beam antenna due to the radome's parameters.
{"title":"Antenna-radome interaction of 2GHz band 120/spl deg/ beam antenna","authors":"Huiling Jiang, H. Arai, Y. Ebine","doi":"10.1109/APS.2001.960032","DOIUrl":"https://doi.org/10.1109/APS.2001.960032","url":null,"abstract":"The purpose of this study is to investigate input and radiation characteristics of antennas due to parameters of the dielectric cylindrical radome. Sector antennas occupy an important position in base station antennas. It is necessary to investigate the radome effect for sector antennas. In this paper, we investigate the input and radiation characteristic of a 2 GHz band 120/spl deg/ beam antenna due to the radome's parameters.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133497272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The performance of mobile phones is important in mobile networks, particularly in environments characterized by severe multipath fading effects. Thus, it is important to know what antenna characteristics might improve the performance of mobile phones. The effects of the properties of the antenna radiation pattern on the performance of the antenna in different environments are presented. Measured signal distributions and synthetic antenna radiation patterns have been used in the analysis. In the synthesis, no superior way of improving the performance of a mobile terminal could be found by means of different radiation patterns. However, some small improvements can be found. As the main beam is narrowed, the performance becomes slightly better. Also, tilting the beam somewhat above the horizontal level increases the performance. The more the polarization of the antenna is vertical, the better the performance. Therefore, polarization diversity with maximum ratio combining might be useful in compensating handset tilting.
{"title":"Effects of antenna radiation pattern on the performance of the mobile handset","authors":"K. Sulonen, P. Vainkainen","doi":"10.1109/APS.2001.960106","DOIUrl":"https://doi.org/10.1109/APS.2001.960106","url":null,"abstract":"The performance of mobile phones is important in mobile networks, particularly in environments characterized by severe multipath fading effects. Thus, it is important to know what antenna characteristics might improve the performance of mobile phones. The effects of the properties of the antenna radiation pattern on the performance of the antenna in different environments are presented. Measured signal distributions and synthetic antenna radiation patterns have been used in the analysis. In the synthesis, no superior way of improving the performance of a mobile terminal could be found by means of different radiation patterns. However, some small improvements can be found. As the main beam is narrowed, the performance becomes slightly better. Also, tilting the beam somewhat above the horizontal level increases the performance. The more the polarization of the antenna is vertical, the better the performance. Therefore, polarization diversity with maximum ratio combining might be useful in compensating handset tilting.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133578144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In a phased array with limited-scan capability, the radiating element spacing is larger than one half wavelength and the element gain is higher than its full-scan counterpart to avoid grating lobes. This paper presents a new high-gain element made of a microstrip patch at the focal point of a small lens of only three wavelengths in diameter. Simulations showed that the lens still focuses the electromagnetic energy in spite of being electrically small. However, the focal region is quite spread out and the focal length is different from that predicted by geometrical optics. Fabrication and tests of a single element and a four-element array showed good agreement with theory. One application for a limited-scan array is an electronic tracking antenna for a fixed satcom terminal looking at a geosynchronous satellite stabilized in azimuth but not in elevation, as is often the case with military satellites.
{"title":"Millimetre-wave limited-scan array using small lenses","authors":"J. Poirier, G. Morin, Y. Antar, J. Moffat","doi":"10.1109/APS.2001.959850","DOIUrl":"https://doi.org/10.1109/APS.2001.959850","url":null,"abstract":"In a phased array with limited-scan capability, the radiating element spacing is larger than one half wavelength and the element gain is higher than its full-scan counterpart to avoid grating lobes. This paper presents a new high-gain element made of a microstrip patch at the focal point of a small lens of only three wavelengths in diameter. Simulations showed that the lens still focuses the electromagnetic energy in spite of being electrically small. However, the focal region is quite spread out and the focal length is different from that predicted by geometrical optics. Fabrication and tests of a single element and a four-element array showed good agreement with theory. One application for a limited-scan array is an electronic tracking antenna for a fixed satcom terminal looking at a geosynchronous satellite stabilized in azimuth but not in elevation, as is often the case with military satellites.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"290 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133678490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A new technique for the scattering problem of an electrically large body with an open cavity, the generalized combined field integral equation (GCFIE) technique, is presented. In GCFIE, both the electric currents and the magnetic currents are operated by just the same CFIE integral operator. Before applying GCFIE, the magnetic currents on the aperture of the cavity had been solved by CS+ABIM (Connection Scheme and Approximate BIM) mentioned in this paper. Thus the only unknowns in GCFIE are the equivalent electric currents on the outer surface of the body whose aperture is closed by an electric conducting wall. Subsequently, MLFMA is applied directly to efficiently calculate the surface electric currents in GCFIE. Several numerical results are presented, demonstrating the accuracy, efficiency and practicability of the GCFIE technique.
提出了一种求解开腔电大体散射问题的新方法——广义组合场积分方程(GCFIE)技术。在GCFIE中，电流和磁流都由同一个CFIE积分算子进行运算。在应用GCFIE之前，已经用文中提到的CS+ABIM (Connection Scheme and Approximate BIM)求解了腔孔上的磁电流。因此，GCFIE中唯一未知的是物体外表面的等效电流，其孔被导电壁封闭。随后，将MLFMA直接应用于GCFIE表面电流的高效计算。给出了几个数值结果，证明了GCFIE技术的准确性、有效性和实用性。
{"title":"A new technique for scattering by the electrical large body with an open cavity - generalized CFIE","authors":"W. Gang, Nie Zai Ping, Wang Jun","doi":"10.1109/APS.2001.959567","DOIUrl":"https://doi.org/10.1109/APS.2001.959567","url":null,"abstract":"A new technique for the scattering problem of an electrically large body with an open cavity, the generalized combined field integral equation (GCFIE) technique, is presented. In GCFIE, both the electric currents and the magnetic currents are operated by just the same CFIE integral operator. Before applying GCFIE, the magnetic currents on the aperture of the cavity had been solved by CS+ABIM (Connection Scheme and Approximate BIM) mentioned in this paper. Thus the only unknowns in GCFIE are the equivalent electric currents on the outer surface of the body whose aperture is closed by an electric conducting wall. Subsequently, MLFMA is applied directly to efficiently calculate the surface electric currents in GCFIE. Several numerical results are presented, demonstrating the accuracy, efficiency and practicability of the GCFIE technique.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133680616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In Yegin (1999) and Yegin and Martin (1997), a monopole antenna is loaded with three parallel inductor-resistor circuits and has an ideal lossless matching network consisting of a transformer, shunt inductors, and series capacitors. Although no measured results are presented, the numerical results indicate voltage standing wave ratio (VSWR) less than 3.5 and system gain greater than -5.5 dBi over a 25:1 bandwidth (20-500 MHz). In this paper, the system of Yegin is simplified and re-optimized over a 15:1 bandwidth in order to pursue a physically realizable design. Measured results of a constructed antenna and matching network indicate a bandwidth ratio of 12.6:1.
在Yegin(1999)和Yegin and Martin(1997)中，单极天线加载了三个并联电感-电阻电路，并具有由变压器，并联电感器和串联电容器组成的理想无损匹配网络。虽然没有给出测量结果，但数值结果表明，在25:1带宽(20-500 MHz)下，电压驻波比(VSWR)小于3.5，系统增益大于-5.5 dBi。在本文中，为了追求物理上可实现的设计，Yegin系统在15:1的带宽上进行了简化和重新优化。所构建的天线与匹配网络的实测结果表明，带宽比为12.6:1。
{"title":"Genetic algorithm optimization and realization of broadband loaded wire monopoles","authors":"S. Rogers, C. Butler, A. Martin","doi":"10.1109/APS.2001.959556","DOIUrl":"https://doi.org/10.1109/APS.2001.959556","url":null,"abstract":"In Yegin (1999) and Yegin and Martin (1997), a monopole antenna is loaded with three parallel inductor-resistor circuits and has an ideal lossless matching network consisting of a transformer, shunt inductors, and series capacitors. Although no measured results are presented, the numerical results indicate voltage standing wave ratio (VSWR) less than 3.5 and system gain greater than -5.5 dBi over a 25:1 bandwidth (20-500 MHz). In this paper, the system of Yegin is simplified and re-optimized over a 15:1 bandwidth in order to pursue a physically realizable design. Measured results of a constructed antenna and matching network indicate a bandwidth ratio of 12.6:1.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132157551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Many antennas are used while mounted on a small structure. Mobile phones are taken as the most widespread example. With few exceptions it is the support structure which is radiating rather than the antenna element. To get an unified approach the concept of the support structure defined antenna (SDA) is defined and quantities for describing the function of the SDA are discussed. The most important parameter is a new coupling factor telling how the antenna functions of the support structure will interact to give the total antenna function. Using this tool it is more easy to compare the function of different alternatives for antenna element mounted on the same support structure. The method gives additional information to the EM-simulations which for mobile phones are the common method of analysis. Other examples beside the mobile phones are HF antennas on aircrafts, AM-antennas on cars and most types of hand portable radio sets. It follows from the definition that the antenna element is small compared to the wavelength and thus the radiation is more or less omnidirectional or rather dipole-like. Antenna radiation tests of SDAs is a related item where the connection cable modifies the support structure during the measurement.
{"title":"SDA-a new family of small antennas used since long time","authors":"O. Edvardsson","doi":"10.1109/APS.2001.960135","DOIUrl":"https://doi.org/10.1109/APS.2001.960135","url":null,"abstract":"Many antennas are used while mounted on a small structure. Mobile phones are taken as the most widespread example. With few exceptions it is the support structure which is radiating rather than the antenna element. To get an unified approach the concept of the support structure defined antenna (SDA) is defined and quantities for describing the function of the SDA are discussed. The most important parameter is a new coupling factor telling how the antenna functions of the support structure will interact to give the total antenna function. Using this tool it is more easy to compare the function of different alternatives for antenna element mounted on the same support structure. The method gives additional information to the EM-simulations which for mobile phones are the common method of analysis. Other examples beside the mobile phones are HF antennas on aircrafts, AM-antennas on cars and most types of hand portable radio sets. It follows from the definition that the antenna element is small compared to the wavelength and thus the radiation is more or less omnidirectional or rather dipole-like. Antenna radiation tests of SDAs is a related item where the connection cable modifies the support structure during the measurement.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"530 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128863050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A three-dimensional electromagnetic scattering model based on the multiresolution time-domain (MRTD) scheme is presented, in which we apply an anisotropic perfectly matched layer (APML) absorber for open boundary truncation to the MRTD scattering analysis. We develop an MRTD near-to-far-zone field transform to derive the scattered fields, and adopt the pure scattered field formulation in order to obtain effective incident and scattered fields. With applications of the MRTD scheme, we construct the surface equivalent currents in the near-zone region and further derive the radar cross section (RCS) in the far-zone region for different scattering targets including perfectly electric conducting and lossy dielectric targets.
{"title":"MRTD application for scattering analysis","authors":"Q. Cao, P. Wai, C. Yinchao","doi":"10.1109/APS.2001.959514","DOIUrl":"https://doi.org/10.1109/APS.2001.959514","url":null,"abstract":"A three-dimensional electromagnetic scattering model based on the multiresolution time-domain (MRTD) scheme is presented, in which we apply an anisotropic perfectly matched layer (APML) absorber for open boundary truncation to the MRTD scattering analysis. We develop an MRTD near-to-far-zone field transform to derive the scattered fields, and adopt the pure scattered field formulation in order to obtain effective incident and scattered fields. With applications of the MRTD scheme, we construct the surface equivalent currents in the near-zone region and further derive the radar cross section (RCS) in the far-zone region for different scattering targets including perfectly electric conducting and lossy dielectric targets.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127658664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We propose a method to realize a novel multiple-mode conical-horn antenna. This antenna has a serpentine-shaped taper, which is quite effective to make the horn antenna compact in size and to realize a low cross polarization. Comparison between our horn antenna and the conventional ones is presented. We discus experimentally the test antennas of the X and U bands.
{"title":"A compact low-cross-polarization horn antenna with serpentine-shaped taper","authors":"H. Deguchi, M. Tsuji, H. Shigesawa","doi":"10.1109/APS.2001.959728","DOIUrl":"https://doi.org/10.1109/APS.2001.959728","url":null,"abstract":"We propose a method to realize a novel multiple-mode conical-horn antenna. This antenna has a serpentine-shaped taper, which is quite effective to make the horn antenna compact in size and to realize a low cross polarization. Comparison between our horn antenna and the conventional ones is presented. We discus experimentally the test antennas of the X and U bands.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134472008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Numerical solutions of electromagnetic scattering problems often use method of moments (MoM) based on a variety of integral equations. The traditional electric and magnetic field integral equations (EFIE/MFIE) fail at the resonant frequencies associated with the interior cavity modes of the closed three-dimensional (3D) bodies and several techniques have been proposed to deal with these resonances. Among these techniques, a large class of methods use dual-surfaces to create a well-conditioned problem. These methods operate with MFIE - both on the surface of the body and also on the virtual surface located inside it, and are sensitive to the location of the virtual surface. We propose an alternative form of dual-surface integral equation for computing electromagnetic scattering from perfectly conducting arbitrary three-dimensional (3-D) bodies that enforces conventional MFIE on the surface of the body and EFIE on the virtual surface. The enforcement of DS-CFIE leads to an overdetermined problem of 3N equations with 2N unknowns when solved using MoM. This over determined system is solved for a least squares solution using normal form of the conjugate gradient (CG) method. Numerical results have been presented for the case of plane wave scattering from a conducting sphere and cube to validate the present approach.
{"title":"The dual surface combined field integral equation for scattering from three-dimensional objects","authors":"V. Prakash, R. Mittra","doi":"10.1109/APS.2001.959662","DOIUrl":"https://doi.org/10.1109/APS.2001.959662","url":null,"abstract":"Numerical solutions of electromagnetic scattering problems often use method of moments (MoM) based on a variety of integral equations. The traditional electric and magnetic field integral equations (EFIE/MFIE) fail at the resonant frequencies associated with the interior cavity modes of the closed three-dimensional (3D) bodies and several techniques have been proposed to deal with these resonances. Among these techniques, a large class of methods use dual-surfaces to create a well-conditioned problem. These methods operate with MFIE - both on the surface of the body and also on the virtual surface located inside it, and are sensitive to the location of the virtual surface. We propose an alternative form of dual-surface integral equation for computing electromagnetic scattering from perfectly conducting arbitrary three-dimensional (3-D) bodies that enforces conventional MFIE on the surface of the body and EFIE on the virtual surface. The enforcement of DS-CFIE leads to an overdetermined problem of 3N equations with 2N unknowns when solved using MoM. This over determined system is solved for a least squares solution using normal form of the conjugate gradient (CG) method. Numerical results have been presented for the case of plane wave scattering from a conducting sphere and cube to validate the present approach.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134486803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Patch antennas are receiving increasing interest in various mobile communication systems since they can provide advantages over traditional whip and helix antennas in terms of high efficiency, low EM coupling to the human head and increased mechanical reliability (see Pattnail, S.S. et al., 1998). The main disadvantages are their narrow impedance bandwidth and large size for mobile applications. Several techniques have been proposed to overcome the size problem of conventional patch antennas. Many efforts have recently been taken to improve the bandwidth of the shorted patch antennas. For our previous design (see Guo, Y.X., et al., Electron. Lett., vol.35, no.24, p.2069-70, 1999), the substrate thickness must be within a range to obtain a wide impedance bandwidth. Broadband and dual-frequency shorted U-shaped patch antennas are presented. Different-length arms of the U-shaped patch are used to produce two staggered resonant modes. For a given substrate thickness, a wide impedance bandwidth can easily be obtained. The proposed antenna is simpler in structure than regular stacked patch antennas (see Zaid, L. et al., IEEE Trans., vol.AP-47, no.4, p.654-60, 1999), and has more freedom on the choice of bandwidth and size than our previous design.
贴片天线在各种移动通信系统中受到越来越多的关注，因为它们比传统的鞭状和螺旋天线在高效率、低电磁耦合和提高机械可靠性方面具有优势(见Pattnail, S.S.等人，1998年)。主要缺点是阻抗带宽窄，移动应用尺寸大。为了克服传统贴片天线的尺寸问题，已经提出了几种技术。近年来，人们为提高短贴片天线的带宽作出了许多努力。对于我们之前的设计(见Guo, yx, et .， Electron。列托人。第35卷，no。24, p.2069-70, 1999)，衬底厚度必须在一定范围内才能获得较宽的阻抗带宽。提出了宽带和双频短u型贴片天线。不同长度的u型贴片臂被用来产生两个交错的谐振模式。对于给定的衬底厚度，可以很容易地获得较宽的阻抗带宽。所提出的天线在结构上比常规的堆叠贴片天线更简单(见Zaid, L. et al.， IEEE Trans。ap -47卷，没有。4, p.654-60, 1999)，并且在带宽和大小的选择上比我们以前的设计有更多的自由。
{"title":"A quarter-wave U-shaped patch antenna with two unequal arms for wideband and dual-frequency operation","authors":"Yong-xin Guo, K. Luk, Kai-fong Lee, R. Chair","doi":"10.1109/APS.2001.959398","DOIUrl":"https://doi.org/10.1109/APS.2001.959398","url":null,"abstract":"Patch antennas are receiving increasing interest in various mobile communication systems since they can provide advantages over traditional whip and helix antennas in terms of high efficiency, low EM coupling to the human head and increased mechanical reliability (see Pattnail, S.S. et al., 1998). The main disadvantages are their narrow impedance bandwidth and large size for mobile applications. Several techniques have been proposed to overcome the size problem of conventional patch antennas. Many efforts have recently been taken to improve the bandwidth of the shorted patch antennas. For our previous design (see Guo, Y.X., et al., Electron. Lett., vol.35, no.24, p.2069-70, 1999), the substrate thickness must be within a range to obtain a wide impedance bandwidth. Broadband and dual-frequency shorted U-shaped patch antennas are presented. Different-length arms of the U-shaped patch are used to produce two staggered resonant modes. For a given substrate thickness, a wide impedance bandwidth can easily be obtained. The proposed antenna is simpler in structure than regular stacked patch antennas (see Zaid, L. et al., IEEE Trans., vol.AP-47, no.4, p.654-60, 1999), and has more freedom on the choice of bandwidth and size than our previous design.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133747764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)
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