Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1608972
R. Kushwah, M. Dubey, P. Singhal
This paper presents a probe fed patch antenna. The proposed antenna has VSWR 2 for frequency band 0.1 GHz to 9.6GHz. Investigations on the impedance and radiation characteristics have also been carried out. The investigations show that the proposed antenna not only offers the enhance impedance bandwidth but also possess the same characteristics over desired frequency band. In this paper probe fed microstrip antenna is presented. The objective of the proposed design is to improve the impedance bandwidth. Simulation of the proposed antenna has been carried out using IE3D software (15) and its various characteristics have been investigated. ANTENNA DESIGN The proposed configuration of the antenna is shown in figure 1 The proposed design consist of three layers in which one circular patch of radius 2mm is placed in layer 1, A square patch of 4×4 mmE is placed in layer 2 and 3. Layer 3 is circular patch with radius 1mm, as of layer 1 is positioned and there is dielectric of r =1 of thickness 0.5mm in between of each layer. To excite the patch of the first layer, a dual probe feed is applied to the patch at layer 1. Two substrates of different dielectric constants are used. The substrates are of thickness 1 mm as layer 1, 1mm as layer 2 and 1.5mm as layer 3 from the ground plane. The dielectric constant between layer 1 and 2 is 1 and between layer 2 and 3 is also 1
{"title":"Design of a Triple Layer Microstrip Patch Antenna","authors":"R. Kushwah, M. Dubey, P. Singhal","doi":"10.1109/IWAT.2006.1608972","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608972","url":null,"abstract":"This paper presents a probe fed patch antenna. The proposed antenna has VSWR 2 for frequency band 0.1 GHz to 9.6GHz. Investigations on the impedance and radiation characteristics have also been carried out. The investigations show that the proposed antenna not only offers the enhance impedance bandwidth but also possess the same characteristics over desired frequency band. In this paper probe fed microstrip antenna is presented. The objective of the proposed design is to improve the impedance bandwidth. Simulation of the proposed antenna has been carried out using IE3D software (15) and its various characteristics have been investigated. ANTENNA DESIGN The proposed configuration of the antenna is shown in figure 1 The proposed design consist of three layers in which one circular patch of radius 2mm is placed in layer 1, A square patch of 4×4 mmE is placed in layer 2 and 3. Layer 3 is circular patch with radius 1mm, as of layer 1 is positioned and there is dielectric of r =1 of thickness 0.5mm in between of each layer. To excite the patch of the first layer, a dual probe feed is applied to the patch at layer 1. Two substrates of different dielectric constants are used. The substrates are of thickness 1 mm as layer 1, 1mm as layer 2 and 1.5mm as layer 3 from the ground plane. The dielectric constant between layer 1 and 2 is 1 and between layer 2 and 3 is also 1","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129864453","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}
Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1609041
S. Lee, K. Zhao, M. Vouvakis, J. Lee
The quest for more efficient and accurate computational electromagnetics (CEM) techniques has been vital in the design of modern engineering. The most successful of all fast CEM algorithms is the Multilevel Fast Multipole Method (MLFMM) [1], which manages to reduce the computational effort by taking advantage the translational symmetries of the integral equation kernel. The main motivation of this paper lays in a simple yet crucial observation of most of realworld electromagnetic problems they all exhibit certain degrees of redundancies, locally and/or globally. Take for example a vehicle: its geometry is symmetric with respect to a mid-plane; for an antenna array or frequency selective surface the redundancies are more obvious since all elements are identical. The present paper proposes a novel approach for analyzing large finite periodic structures such as antenna arrays and electromagnetic band gap (EBG) ground planes.
在现代工程设计中，寻求更高效、更精确的计算电磁学(CEM)技术是至关重要的。在所有快速CEM算法中，最成功的是多层快速多极子方法(Multilevel fast Multipole Method, MLFMM)[1]，它利用积分方程核的平移对称性减少了计算量。本文的主要动机在于对大多数现实世界的电磁问题进行简单而关键的观察，它们都表现出一定程度的局部和/或全局冗余。以一辆汽车为例:它的几何形状相对于中间平面是对称的;对于天线阵列或频率选择表面，由于所有元件都是相同的，因此冗余更为明显。本文提出了一种分析天线阵列和电磁带隙(EBG)接地面等大型有限周期结构的新方法。
{"title":"Modeling Finite Periodic Structures using a Finite Element Domain Decomposition Technique with 2nd Order Transmission Conditions","authors":"S. Lee, K. Zhao, M. Vouvakis, J. Lee","doi":"10.1109/IWAT.2006.1609041","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609041","url":null,"abstract":"The quest for more efficient and accurate computational electromagnetics (CEM) techniques has been vital in the design of modern engineering. The most successful of all fast CEM algorithms is the Multilevel Fast Multipole Method (MLFMM) [1], which manages to reduce the computational effort by taking advantage the translational symmetries of the integral equation kernel. The main motivation of this paper lays in a simple yet crucial observation of most of realworld electromagnetic problems they all exhibit certain degrees of redundancies, locally and/or globally. Take for example a vehicle: its geometry is symmetric with respect to a mid-plane; for an antenna array or frequency selective surface the redundancies are more obvious since all elements are identical. The present paper proposes a novel approach for analyzing large finite periodic structures such as antenna arrays and electromagnetic band gap (EBG) ground planes.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127543154","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}
Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1609032
B. Kramer, Ming Lee, Chi-Chih Chen, J. Volakis
Many commercial and military applications require small low profile UWB antennas that operate from 50 MHz to 2000 MHz. Using conventional designs to cover such a vast frequency range with a single antenna would require an aperture size and profile which are too large for practical applications. Antenna miniaturization techniques such as dielectric [1, 2] or reactive loading [3, 4] are commonly used to increase the antenna’s electrical size without increasing its physical size. However, each of these miniaturization techniques by itself faces important performance trade-offs for large miniaturization factors. In this paper, a hybrid approach that involves both dielectric and reactive loading is used to maximize the miniaturization factor while minimizing any adverse effects. Our approach to miniaturizing an UWB antenna involves the use dielectric material on both sides of the antenna (substrate and superstrate) to maximize the miniaturization factor for a given dielectric constant [5]. In addition, the thickness of the dielectric material is tapered to suppress dielectric resonance oscillation (DRO) modes and surface waves as well as to maintain high-frequency performance [2, 5]. To maximize the miniaturization factor while minimizing the negative effects of dielectric loading, reactive loading or the artificial transmission line (ATL) concept [3] is also used. This allows us to minimize the dielectric constant which results in less impedance reduction, a minimal antenna weight and reduces possible surface wave effects. The following sections will discuss some of the issues associated with dielectric loading, the implementation of reactive loading for the spiral antenna and the miniaturization limit for the spiral antenna. 2. SPIRAL ANTENNA MINIATURIZATION VIA MATERIAL Dielectric material loading for the purpose of spiral miniaturization has its limits [5]. Specifically, while the low frequency gain is usually improved by dielectric material loading [2, 5], high frequency gain tends to decrease if high contrast material is used. To demonstrate this, we chose to simulate a four-arm spiral antenna that is 2″ wide and 0.5″ high above an infinite ground plane, with dielectric material the same size of the antenna sandwiched between. Specifically, we extract the broadside circular-polarized gain at two different frequencies and plot them as a function of dielectric constant (Figure 1). As can be seen, there exists an optimum value of dielectric constant of the loading material, above which high frequency gain starts to decrease.
{"title":"Miniature UWB Antenna with Embedded Inductive Loading","authors":"B. Kramer, Ming Lee, Chi-Chih Chen, J. Volakis","doi":"10.1109/IWAT.2006.1609032","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609032","url":null,"abstract":"Many commercial and military applications require small low profile UWB antennas that operate from 50 MHz to 2000 MHz. Using conventional designs to cover such a vast frequency range with a single antenna would require an aperture size and profile which are too large for practical applications. Antenna miniaturization techniques such as dielectric [1, 2] or reactive loading [3, 4] are commonly used to increase the antenna’s electrical size without increasing its physical size. However, each of these miniaturization techniques by itself faces important performance trade-offs for large miniaturization factors. In this paper, a hybrid approach that involves both dielectric and reactive loading is used to maximize the miniaturization factor while minimizing any adverse effects. Our approach to miniaturizing an UWB antenna involves the use dielectric material on both sides of the antenna (substrate and superstrate) to maximize the miniaturization factor for a given dielectric constant [5]. In addition, the thickness of the dielectric material is tapered to suppress dielectric resonance oscillation (DRO) modes and surface waves as well as to maintain high-frequency performance [2, 5]. To maximize the miniaturization factor while minimizing the negative effects of dielectric loading, reactive loading or the artificial transmission line (ATL) concept [3] is also used. This allows us to minimize the dielectric constant which results in less impedance reduction, a minimal antenna weight and reduces possible surface wave effects. The following sections will discuss some of the issues associated with dielectric loading, the implementation of reactive loading for the spiral antenna and the miniaturization limit for the spiral antenna. 2. SPIRAL ANTENNA MINIATURIZATION VIA MATERIAL Dielectric material loading for the purpose of spiral miniaturization has its limits [5]. Specifically, while the low frequency gain is usually improved by dielectric material loading [2, 5], high frequency gain tends to decrease if high contrast material is used. To demonstrate this, we chose to simulate a four-arm spiral antenna that is 2″ wide and 0.5″ high above an infinite ground plane, with dielectric material the same size of the antenna sandwiched between. Specifically, we extract the broadside circular-polarized gain at two different frequencies and plot them as a function of dielectric constant (Figure 1). As can be seen, there exists an optimum value of dielectric constant of the loading material, above which high frequency gain starts to decrease.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129027131","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}
Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1609030
J.J.H. Wang
Classical theory on fundamental gain bandwidth limitation for antennas constrained by their electrical size has been extensively examined, and is collectively referred to here as the Chu theory [1]. However, there are major shortcomings and ambiguities in the Chu theory when applied to real world problems, as pointed out recently by this author [2]. One problem is the case of an antenna on a platform, as depicted in Fig. 1, where the antenna is generally inseparable from the transceiver/platform. In fact, in some designs the main radiator is the platform or transceiver, not the antenna per se. Thus, the extent and size of the antenna become ambiguous. Also, the Chu theory is valid only for high Q (Quality factor). With the platform becoming part of it, the antennas effective size is increased and its Q can be lowered beyond the realm of the Chu theory.
{"title":"Fundamental Bandwidth Limitation for Small Antennas on a Platform","authors":"J.J.H. Wang","doi":"10.1109/IWAT.2006.1609030","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609030","url":null,"abstract":"Classical theory on fundamental gain bandwidth limitation for antennas constrained by their electrical size has been extensively examined, and is collectively referred to here as the Chu theory [1]. However, there are major shortcomings and ambiguities in the Chu theory when applied to real world problems, as pointed out recently by this author [2]. One problem is the case of an antenna on a platform, as depicted in Fig. 1, where the antenna is generally inseparable from the transceiver/platform. In fact, in some designs the main radiator is the platform or transceiver, not the antenna per se. Thus, the extent and size of the antenna become ambiguous. Also, the Chu theory is valid only for high Q (Quality factor). With the platform becoming part of it, the antennas effective size is increased and its Q can be lowered beyond the realm of the Chu theory.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129178088","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}
Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1609024
X. Bao, M. Ammann, G. Ruvio, M. John
th iteration). For the 1 st and 2 rd iteration, each side is replaced with new scaled generator (A1=A/3; B1=0.5*A1, A2=A1/3, B2=0.5*A2), where A1, A2 and B1, B2 are segment and indentation lengths, respectively (Fig.1). The period of the proposed EBG structure is 32.5mm, and A=27mm. A fractal patch connected to the continuous ground plane through a shorting pin constitutes a unit of the lattice. The radius of the shorting pin is 0.5mm. The dispersion characteristics of the fractal Hi-Impedance Surface EBG structure is calculated using the Finite Element Method (FEM). The results illustrated in Fig.2 show a wide bandgap from 1.27GHz to 2.05GHz. A square patch antenna with truncated opposite corners is designed as Fig.3, which excites both the TM01 and TM10 orthogonal modes, can produce circularly polarized fields. The square patch antenna size is 56.0×56.0m
{"title":"High Performance Circularly Polarized Antenna Based on the Fractal EBG structure","authors":"X. Bao, M. Ammann, G. Ruvio, M. John","doi":"10.1109/IWAT.2006.1609024","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609024","url":null,"abstract":"th iteration). For the 1 st and 2 rd iteration, each side is replaced with new scaled generator (A1=A/3; B1=0.5*A1, A2=A1/3, B2=0.5*A2), where A1, A2 and B1, B2 are segment and indentation lengths, respectively (Fig.1). The period of the proposed EBG structure is 32.5mm, and A=27mm. A fractal patch connected to the continuous ground plane through a shorting pin constitutes a unit of the lattice. The radius of the shorting pin is 0.5mm. The dispersion characteristics of the fractal Hi-Impedance Surface EBG structure is calculated using the Finite Element Method (FEM). The results illustrated in Fig.2 show a wide bandgap from 1.27GHz to 2.05GHz. A square patch antenna with truncated opposite corners is designed as Fig.3, which excites both the TM01 and TM10 orthogonal modes, can produce circularly polarized fields. The square patch antenna size is 56.0×56.0m","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131929425","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}
Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1609052
Guan-Yu Chen, Yun-Ta Chen, Jwo-Shiun Sun, Wen-Fang Yen
In this paper, a compact and lower profile Yagi-Uda antenna with a balanced to unbalanced (sleeve balun) feed network and directional beam controlled by reflector and directors is presented. Parasitic director, driver and reflector of the designed antenna are designed to control the beam peak and beam bandwidth by the director toward the end-fire direction to centralize radiation power energy for point to point downlink and uplink multi direction multiplexed wireless communication applications and applied 4×4 beamforming (bulter matrix) network for smart antenna design and measurement.
{"title":"The Compact Yagi Antenna Design Serve Beamforming Operation and Smart Antenna Application","authors":"Guan-Yu Chen, Yun-Ta Chen, Jwo-Shiun Sun, Wen-Fang Yen","doi":"10.1109/IWAT.2006.1609052","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609052","url":null,"abstract":"In this paper, a compact and lower profile Yagi-Uda antenna with a balanced to unbalanced (sleeve balun) feed network and directional beam controlled by reflector and directors is presented. Parasitic director, driver and reflector of the designed antenna are designed to control the beam peak and beam bandwidth by the director toward the end-fire direction to centralize radiation power energy for point to point downlink and uplink multi direction multiplexed wireless communication applications and applied 4×4 beamforming (bulter matrix) network for smart antenna design and measurement.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130413449","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}
Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1609025
M. Sarehraz, K. Buckle, E. Stefanakos, T. Weller
Dielectric rod antennas exhibit very high gain, possess narrow beamwidth, and belong to the group of surface wave antennas. They have been extensively used as the parabolic reflectors' feed in radars. They are rarely used as arrays, because of the complexity of the feed structure and lack of appropriate transition to the printed circuit. The scaling of microstrip microwave circuits to operate at millimeter and optical frequencies has led to the investigation of a new feed structure for DRA. This paper covers the design of a novel NRD feed structure for dielectric rod antennas, which is also compatible to planar structures.
{"title":"An Aperture Coupled NRD Feed Structure for Dielectric Rod Antennas","authors":"M. Sarehraz, K. Buckle, E. Stefanakos, T. Weller","doi":"10.1109/IWAT.2006.1609025","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609025","url":null,"abstract":"Dielectric rod antennas exhibit very high gain, possess narrow beamwidth, and belong to the group of surface wave antennas. They have been extensively used as the parabolic reflectors' feed in radars. They are rarely used as arrays, because of the complexity of the feed structure and lack of appropriate transition to the printed circuit. The scaling of microstrip microwave circuits to operate at millimeter and optical frequencies has led to the investigation of a new feed structure for DRA. This paper covers the design of a novel NRD feed structure for dielectric rod antennas, which is also compatible to planar structures.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"331 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134462677","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}
Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1609016
M. Ali, G. Yang, R. Dougal
Embedded wireless sensors are becoming crucial for many safety critical applications. Sensor batteries must be charged as needed to support high data rate communications. A miniature packaged circularly polarized rectenna is proposed. With the help of an integrated band-reject filter the proposed rectenna achieves a conversion efficiency of 74% and suppresses the second harmonic emission at 11 GHz by more than 50 dB.
{"title":"A Miniature Packaged Rectenna for Wireless Power Transmission and Data Telemetry","authors":"M. Ali, G. Yang, R. Dougal","doi":"10.1109/IWAT.2006.1609016","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609016","url":null,"abstract":"Embedded wireless sensors are becoming crucial for many safety critical applications. Sensor batteries must be charged as needed to support high data rate communications. A miniature packaged circularly polarized rectenna is proposed. With the help of an integrated band-reject filter the proposed rectenna achieves a conversion efficiency of 74% and suppresses the second harmonic emission at 11 GHz by more than 50 dB.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132474182","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}
Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1609009
S. Mestdagh, O. Vasylchenko, G. Vandenbosch
Thanks to an increasing level of integration in microelectronics, the antenna is often the largest component in a wireless system. Antenna research has seen several attempts to make the complete system as compact as possible. It is important to keep in mind the theoretical limitations to this miniaturization. Wheeler [1] was the first to explain how the efficiencybandwidth product of an antenna is ultimately limited by its size relative to the operational wavelength. The computation of the minimum radiation Q of an antenna has been studied in detail by Chu [2], Collin and Rothschild [3], and more recently McLean [4]. The minimum radiation Q of a linearly polarized, lossless antenna is found to be given by
{"title":"Benchmarking of a GSM Dual-band Planar Monopole Antenna","authors":"S. Mestdagh, O. Vasylchenko, G. Vandenbosch","doi":"10.1109/IWAT.2006.1609009","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609009","url":null,"abstract":"Thanks to an increasing level of integration in microelectronics, the antenna is often the largest component in a wireless system. Antenna research has seen several attempts to make the complete system as compact as possible. It is important to keep in mind the theoretical limitations to this miniaturization. Wheeler [1] was the first to explain how the efficiencybandwidth product of an antenna is ultimately limited by its size relative to the operational wavelength. The computation of the minimum radiation Q of an antenna has been studied in detail by Chu [2], Collin and Rothschild [3], and more recently McLean [4]. The minimum radiation Q of a linearly polarized, lossless antenna is found to be given by","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114228319","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}
Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1608980
K. Queiroz da Costa, V. Dmitriev, A.O. Silva
Antennas that possess broadband characteristics, high radiation efficiency and low dimensions are important in practical applications, for example in mobile communication systems. Wide bandwidth is fundamental in antennas for transmitting broadband signals, in particular, video signals and signals with high transmition rate. In antenna theory, it is well known that small antennas possess narrow bandwidth and small radiation resistance, i.e. small radiation efficiency [1].
{"title":"A Broadband Combined (Linear and Loop) Antenna Above a Ground Plane","authors":"K. Queiroz da Costa, V. Dmitriev, A.O. Silva","doi":"10.1109/IWAT.2006.1608980","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608980","url":null,"abstract":"Antennas that possess broadband characteristics, high radiation efficiency and low dimensions are important in practical applications, for example in mobile communication systems. Wide bandwidth is fundamental in antennas for transmitting broadband signals, in particular, video signals and signals with high transmition rate. In antenna theory, it is well known that small antennas possess narrow bandwidth and small radiation resistance, i.e. small radiation efficiency [1].","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114924480","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}
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