Pub Date : 2006-03-06DOI: 10.1109/IWAT.2006.1609006
S. Ooi, B. Koh
INTRODUCTION A GPS antenna would have the right hand circular polarization, an upward pointing radiation pattern, high gain of about 4 dB and axial ratio of 3 dB max. Back lobes are undesired. The operating frequency is 1575 MHz. The expected bandwidth is 10 MHz. Therefore the expected operating range of frequency is from 1570 – 1580 MHz. However, it has also been found that the polarization requirement of RHCP is desired, but may not be a strict requirement due to highly scattered environment. [1] This paper presents a dual band antenna design for a portable handset chassis of 130 mm x 55 mm operating at both UHF(400430 MHz) and the GPS band with linear polarization. The design utilizes the concept of multiple pitch helixes to provide multiple resonant lengths only a single-element structure, thus ensuring both the flexibility and the simplicity of the design.
GPS天线将具有右手圆极化，指向向上的辐射方向图，大约4 dB的高增益和最大3 dB的轴比。后叶是不需要的。工作频率为1575mhz。期望带宽为10mhz。因此预期的工作频率范围是从1570 - 1580 MHz。然而，也有研究发现，RHCP的偏振要求是需要的，但由于环境高度分散，可能不是严格的要求。[1]本文提出了一种用于130 mm x 55 mm便携式手机机箱的双频天线设计，工作在UHF(400430 MHz)和线性极化的GPS频段。该设计利用多螺距螺旋的概念，在单元件结构中提供多个谐振长度，从而保证了设计的灵活性和简洁性。
{"title":"Single-fed Dual Band UHF-GPS Helical Antenna","authors":"S. Ooi, B. Koh","doi":"10.1109/IWAT.2006.1609006","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609006","url":null,"abstract":"INTRODUCTION A GPS antenna would have the right hand circular polarization, an upward pointing radiation pattern, high gain of about 4 dB and axial ratio of 3 dB max. Back lobes are undesired. The operating frequency is 1575 MHz. The expected bandwidth is 10 MHz. Therefore the expected operating range of frequency is from 1570 – 1580 MHz. However, it has also been found that the polarization requirement of RHCP is desired, but may not be a strict requirement due to highly scattered environment. [1] This paper presents a dual band antenna design for a portable handset chassis of 130 mm x 55 mm operating at both UHF(400430 MHz) and the GPS band with linear polarization. The design utilizes the concept of multiple pitch helixes to provide multiple resonant lengths only a single-element structure, thus ensuring both the flexibility and the simplicity of the design.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"201 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":"133788114","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.2006.1609049
P. Salem, Chen Wu, M. Yagoub
Neural networks have been continually growing in popularity and have been utilized in many new fields and applications. The neural network technique can replace the traditional 'look-up table' in electronic support (ES) receivers (1). In this paper, neural networks were implemented to model the desired spiral antenna radiation patterns. These spiral antennas are used in ES payload for ultra wideband (UWB) applications. It is not possible or practical to measure spiral antenna radiation patterns at all the radiation angles due to the limitation of time. Thus, in this paper we present a neural network that can model the measured antenna patterns of two adjacent ultra-wide bandwidth spiral antennas. Thus the amplitude and phase of the spiral antenna radiation field at a given radiation direction can be predicted based on the knowledge of polarization, frequency, elevation angle (�), and azimuth angle (�). Using polarization, frequency, and the ratio of adjacent antenna received powers as inputs, a neural network was built to predict the angle of arrival (AOA) of an incoming wave.
{"title":"Neural-Based Model of Spiral Antenna Radiation Patterns for Detection of Angle of Arrival","authors":"P. Salem, Chen Wu, M. Yagoub","doi":"10.1109/IWAT.2006.1609049","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609049","url":null,"abstract":"Neural networks have been continually growing in popularity and have been utilized in many new fields and applications. The neural network technique can replace the traditional 'look-up table' in electronic support (ES) receivers (1). In this paper, neural networks were implemented to model the desired spiral antenna radiation patterns. These spiral antennas are used in ES payload for ultra wideband (UWB) applications. It is not possible or practical to measure spiral antenna radiation patterns at all the radiation angles due to the limitation of time. Thus, in this paper we present a neural network that can model the measured antenna patterns of two adjacent ultra-wide bandwidth spiral antennas. Thus the amplitude and phase of the spiral antenna radiation field at a given radiation direction can be predicted based on the knowledge of polarization, frequency, elevation angle (�), and azimuth angle (�). Using polarization, frequency, and the ratio of adjacent antenna received powers as inputs, a neural network was built to predict the angle of arrival (AOA) of an incoming wave.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"108 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114031729","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.2006.1609029
A. Figotin, I. Vitebskiy
Magnetic photonic crystals are periodic arrays of lossless materials, at least one of which being magnetically polarized. Magnetization, either spontaneous or induced, is associated with nonreciprocal effects, such as Faraday rotation. In addition, magnetic photonic crystals of certain configuration can also display strong spectral asymmetry, implying that electromagnetic waves propagate in one direction much faster or slower than in the opposite direction. This essentially nonreciprocal phenomenon can result in electromagnetic unidirectionality. A unidirectional medium, being perfectly transmissive for electromagnetic waves of certain frequency, freezes the radiation of the same frequency propagating in the opposite direction. The frozen mode has zero group velocity and drastically enhanced amplitude. Here we study the nonreciprocal phenomena in magnetic photonic crystals and establish physical conditions under which such phenomena can be significant. Particular attention is given to the relation between structural geometry of the periodic array, the electromagnetic dispersion relation, and the character of the frozen mode regime. We also discuss the peculiarities of transmission band gap resonance in nonreciprocal periodic layered structures. ASYMMETRY OF THE BLOCH DISPERSION RELATION IN MAGNETIC PHOTONIC CRYSTALS
{"title":"Nonreciprocal Effects in Magnetic Photonic Crystals","authors":"A. Figotin, I. Vitebskiy","doi":"10.1109/IWAT.2006.1609029","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609029","url":null,"abstract":"Magnetic photonic crystals are periodic arrays of lossless materials, at least one of which being magnetically polarized. Magnetization, either spontaneous or induced, is associated with nonreciprocal effects, such as Faraday rotation. In addition, magnetic photonic crystals of certain configuration can also display strong spectral asymmetry, implying that electromagnetic waves propagate in one direction much faster or slower than in the opposite direction. This essentially nonreciprocal phenomenon can result in electromagnetic unidirectionality. A unidirectional medium, being perfectly transmissive for electromagnetic waves of certain frequency, freezes the radiation of the same frequency propagating in the opposite direction. The frozen mode has zero group velocity and drastically enhanced amplitude. Here we study the nonreciprocal phenomena in magnetic photonic crystals and establish physical conditions under which such phenomena can be significant. Particular attention is given to the relation between structural geometry of the periodic array, the electromagnetic dispersion relation, and the character of the frozen mode regime. We also discuss the peculiarities of transmission band gap resonance in nonreciprocal periodic layered structures. ASYMMETRY OF THE BLOCH DISPERSION RELATION IN MAGNETIC PHOTONIC CRYSTALS","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":"120850733","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.2006.1608991
M. Polivka, M. Cevela, M. Mazanek
Quarterwavelenght patch antenna loaded by one to three pairs of spiral notches has been used to reach dual to quadband performance. Physical insight on multiband behavior is done via description of vector surface current distribution at individual resonant frequencies acquired by EM simulator IE3D. The used principle has been verified by measurement on the dualband prototype. The method can been generalized as the use of perturbation elements in the patch motif to excite suitable higher order modes to reach multiband performance of the studied antenna.
{"title":"Spiral Notch Perturbation Element Concept for the Design of Multiband Quarterwavelength Patch Antenna","authors":"M. Polivka, M. Cevela, M. Mazanek","doi":"10.1109/IWAT.2006.1608991","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608991","url":null,"abstract":"Quarterwavelenght patch antenna loaded by one to three pairs of spiral notches has been used to reach dual to quadband performance. Physical insight on multiband behavior is done via description of vector surface current distribution at individual resonant frequencies acquired by EM simulator IE3D. The used principle has been verified by measurement on the dualband prototype. The method can been generalized as the use of perturbation elements in the patch motif to excite suitable higher order modes to reach multiband performance of the studied antenna.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"9 4 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":"116539312","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.2006.1609003
Y. Ge, K. Esselle, T. Bird
This paper presents a multi-band, compact, lightweight and low-cost monopole antenna suitable for applications in the wireless local area network (WLAN) and DCS1800/PCS1900 bands. The antenna has a thin substrate, small area and is fed by a microstrip line, which can be directly connected with the associated microwave circuits. The computed and measured results for 1.8, 2.4, 4.9, 5.2 and 5.8 GHz band cases are presented.
{"title":"Compact Triple-Arm Multi-Band Monopole Antenna","authors":"Y. Ge, K. Esselle, T. Bird","doi":"10.1109/IWAT.2006.1609003","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609003","url":null,"abstract":"This paper presents a multi-band, compact, lightweight and low-cost monopole antenna suitable for applications in the wireless local area network (WLAN) and DCS1800/PCS1900 bands. The antenna has a thin substrate, small area and is fed by a microstrip line, which can be directly connected with the associated microwave circuits. The computed and measured results for 1.8, 2.4, 4.9, 5.2 and 5.8 GHz band cases are presented.","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":"122449207","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.2006.1609022
L. Bin, Wu Bian, Liang Chang-hong
A new method of improving the gain of circular waveguide array antenna using metamaterial structure is presented in this paper. The electromagnetic characteristics of metamaterial and high-gain circular waveguide antenna with the metamaterial structure are studied by using the numerical simulation method, which were also compared with those of the conventional circular waveguide antenna. The simulation results show that this method is effective and the metamaterial structure can realize congregating the radiation energy, so the gain of the antenna is increased and the side lobe level is decreased. Keywords-Metamaterial structure; Circular waveguide antenna arrays; High-gain In this paper, we present a new high gain circular waveguide array antenna design using metamaterials structure. The properties of metamaterial structure and the radiation characteristics of the array antennas are investigated by numerical method. Our studies demonstrate that the metamaterial structure can realize an effective refraction index which can be close to zero and congregate the radiation energy, and the array antenna with metamaterial structure can obtain a great improvement of the antenna gain, in comparison with the conventional array antenna. II. PRINCIPAL CHARACTERISTICS OF METAMATERIAL STRUCTURE The metamaterial,which is studied in this paper, is composed of copper grids with a square lattice and whose period is equal to a mm (in the x-axis and y-axis directions). The grids' spacing in the z-axis direction is H mm, and the edge of the square holes of the copper grids is (a-r)mm. the structure of the metamaterial is shown in figure 1.
{"title":"A Study on High Gain Circular Waveguide Array Antenna Using Metamaterial Structure","authors":"L. Bin, Wu Bian, Liang Chang-hong","doi":"10.1109/IWAT.2006.1609022","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609022","url":null,"abstract":"A new method of improving the gain of circular waveguide array antenna using metamaterial structure is presented in this paper. The electromagnetic characteristics of metamaterial and high-gain circular waveguide antenna with the metamaterial structure are studied by using the numerical simulation method, which were also compared with those of the conventional circular waveguide antenna. The simulation results show that this method is effective and the metamaterial structure can realize congregating the radiation energy, so the gain of the antenna is increased and the side lobe level is decreased. Keywords-Metamaterial structure; Circular waveguide antenna arrays; High-gain In this paper, we present a new high gain circular waveguide array antenna design using metamaterials structure. The properties of metamaterial structure and the radiation characteristics of the array antennas are investigated by numerical method. Our studies demonstrate that the metamaterial structure can realize an effective refraction index which can be close to zero and congregate the radiation energy, and the array antenna with metamaterial structure can obtain a great improvement of the antenna gain, in comparison with the conventional array antenna. II. PRINCIPAL CHARACTERISTICS OF METAMATERIAL STRUCTURE The metamaterial,which is studied in this paper, is composed of copper grids with a square lattice and whose period is equal to a mm (in the x-axis and y-axis directions). The grids' spacing in the z-axis direction is H mm, and the edge of the square holes of the copper grids is (a-r)mm. the structure of the metamaterial is shown in figure 1.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"94 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":"125235388","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.2006.1609060
A. Erentok, R. Ziolkowski
There continues to be a great desire for electrically small antennas that could be tailored to satisfy a wide range of specifications for a variety of applications including wireless communications, wireless networks, and sensor arrays. Unfortunately, the traditional electrically small antenna has a number of well-known drawbacks such as a large impedance mismatch with a power source and a poor radiation efficiency. If an efficient, electrically small antenna could be developed, it would have an immediate impact on these and other applications.
{"title":"Efficient Electrically Small Antenna Design Using an Electric Dipole in a Multi-layered ENG Metamaterial Shell","authors":"A. Erentok, R. Ziolkowski","doi":"10.1109/IWAT.2006.1609060","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609060","url":null,"abstract":"There continues to be a great desire for electrically small antennas that could be tailored to satisfy a wide range of specifications for a variety of applications including wireless communications, wireless networks, and sensor arrays. Unfortunately, the traditional electrically small antenna has a number of well-known drawbacks such as a large impedance mismatch with a power source and a poor radiation efficiency. If an efficient, electrically small antenna could be developed, it would have an immediate impact on these and other applications.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"35 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":"127417702","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.2006.1609063
K. Hwang, H. Eom
A slot array antenna using a rectangular waveguide partially filled with a ferrite slab is studied. A theoretical investigation on antenna radiation is performed using the Fourier transform and mode matching method. The radiation patterns of the antenna are measured at 10.06 GHz to confirm good agreement with our computational results.
{"title":"Slot Array Antenna using a Rectangular Waveguide Partially Filled With a Ferrite Slab","authors":"K. Hwang, H. Eom","doi":"10.1109/IWAT.2006.1609063","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609063","url":null,"abstract":"A slot array antenna using a rectangular waveguide partially filled with a ferrite slab is studied. A theoretical investigation on antenna radiation is performed using the Fourier transform and mode matching method. The radiation patterns of the antenna are measured at 10.06 GHz to confirm good agreement with our computational results.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"45 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":"121653554","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.2006.1608979
Guofeng Lu, L. Greenstein, P. Spasojevic
We study waveform distortion properties of antennas when transmitting and receiving ultra-wideband (UWB) signals. The impulse response of the transmit antenna is proportional to the derivative of the impulse response of the corresponding receive antenna. The source of this asymmetry and the condition under which it holds are also discussed. The asymmetry property can be derived from the symmetry properties of transmit and receive antennas, both based on the linearity of Maxwell’s equations in isotropic media. The results are illustrated for a UWB pulse and the diamond antenna based on simulations on XFDTD.
{"title":"Symmetry Properties of Antennas in Transmitting and Receiving UWB Signals","authors":"Guofeng Lu, L. Greenstein, P. Spasojevic","doi":"10.1109/IWAT.2006.1608979","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608979","url":null,"abstract":"We study waveform distortion properties of antennas when transmitting and receiving ultra-wideband (UWB) signals. The impulse response of the transmit antenna is proportional to the derivative of the impulse response of the corresponding receive antenna. The source of this asymmetry and the condition under which it holds are also discussed. The asymmetry property can be derived from the symmetry properties of transmit and receive antennas, both based on the linearity of Maxwell’s equations in isotropic media. The results are illustrated for a UWB pulse and the diamond antenna based on simulations on XFDTD.","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":"114679660","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.2006.1608960
Y. Rahmat-Samii
Recently the ancient Greek prefix, meta (means “beyond”), has been used to describe the composite materials with unique features that do not exist in the nature [1]. Reviewing the literature, it appears that various terminologies have been used to classify metamaterials depending on their applications. As an example, “double negative (DNG) material” refers to those materials with effective negative permittivity and permeability, which results into properties such as left-handed (LH) wave propagation and negative index of refraction (NIR). Periodic structures that prohibits the propagation of electromagnetic waves in a certain frequency band for certain arrival angles and polarization senses are classified as electromagnetic band-gap (EBG) structures. Another important category of metamaterials consist of ground planes that exhibit unique reflection characteristics other than conventional PEC, and are defined as “artificial complex ground planes”. Fig. 1 shows the three basic categories of metamaterials, with some representative applications illustrated. This invited-talk paper summarizes the results published by the author and his co-workers on this subject, with most examples addressed on the design and analysis of metamaterials for antenna applications.
{"title":"Metamaterials in Antenna Applications: Classifications, Designs and Applications","authors":"Y. Rahmat-Samii","doi":"10.1109/IWAT.2006.1608960","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608960","url":null,"abstract":"Recently the ancient Greek prefix, meta (means “beyond”), has been used to describe the composite materials with unique features that do not exist in the nature [1]. Reviewing the literature, it appears that various terminologies have been used to classify metamaterials depending on their applications. As an example, “double negative (DNG) material” refers to those materials with effective negative permittivity and permeability, which results into properties such as left-handed (LH) wave propagation and negative index of refraction (NIR). Periodic structures that prohibits the propagation of electromagnetic waves in a certain frequency band for certain arrival angles and polarization senses are classified as electromagnetic band-gap (EBG) structures. Another important category of metamaterials consist of ground planes that exhibit unique reflection characteristics other than conventional PEC, and are defined as “artificial complex ground planes”. Fig. 1 shows the three basic categories of metamaterials, with some representative applications illustrated. This invited-talk paper summarizes the results published by the author and his co-workers on this subject, with most examples addressed on the design and analysis of metamaterials for antenna applications.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"43 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":"127817719","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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