IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.最新文献

{"title":"The Uncertainties and Repeatability Limitations of Transmitter and Receiver Performance Assessments Posed by Head Phantoms","authors":"E. Ofli, N. Chavannes, N. Kuster","doi":"10.1109/IWAT.2006.1609047","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609047","url":null,"abstract":"Service providers request minimal requirements for the over-the-air performance of handheld devices to maintain high quality services for their mobile networks. Standards for assessing performance in laboratories are currently being developed in order to minimize costly and non-standardized field measurements. The US-based Cellular Telecommunications & Internet Association (CTIA) is currently the only organization that has issued a mandatory standard for over-the-air performance tests [1]. The basis of the test is measurement of the 3D radiation pattern in order to obtain the magnitude and direction of radiating energy while the phone is mounted on a head phantom in a talking position. There are five key parameters: 1) the total radiated power (TRP), 2) the peak effective isotropic radiated power (EIRP), 3) the antenna efficiency, i.e., the ratio of TRP and antenna input power, 4) the antenna gain and 5) the nearhorizontal partial radiated power (NHRP+/-30°, NHRP+/-45°). In addition, the phone must be compliant with the electromagnetic safety limits defined for compliance test procedures, e.g., [2].","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":"114322159","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}

{"title":"A Novel Dual Polarized Dielectric Rod Antenna","authors":"M. Sarehraz, K. Buckle, E. Stefanakos, T. Weller","doi":"10.1109/IWAT.2006.1609015","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609015","url":null,"abstract":"As has been demonstrated, the capacity of the radio channel in mobile communications systems can be increased by means of dual-polarized antennas. The DC output power of rectennas' can also be increased and made less sensitive to the orientation of the transmitting antenna by employing a dual orthogonal polarized antenna instead of a linearly polarized antenna. This paper presents the design of a novel dual-polarized aperture-coupled dielectric rod antenna that uses a non-radiative dielectric guide as a feed for millimeter and infrared applications. This novel design exhibits high gain and port isolation as well as low cross-polarization and back radiation.","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":"116273742","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}

{"title":"Influence of Angular Stability of EBG Structures on Low Profile Dipole Antenna Performance","authors":"L. Akhoondzadeh-Asl, P. Hall, J. Nourinia, C. Ghobadi","doi":"10.1109/IWAT.2006.1609023","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609023","url":null,"abstract":"In this paper the broadband diamond dipole antenna performance above an Electromagnetic Bandgap (EBG) structure composed of an array of square metallic patches and Jerusalem crosses without any vias over a PEC backed dielectric substrate is investigated and compared to each other. The result shows that angular stability of the EBG structures does not significantly affect on the performance of the antenna. INTRODUCTION EBG structures are used to mimic magnetic conductors over a limited frequency range for use as a ground plane in low-profile antenna configurations in addition other microwave applications. Previous research shows that EBG surfaces can act as AMC ground planes by utilizing a periodic patch with or without vias [1,2]. Both methods are capable of creating the AMC condition indicative of a reflection coefficient with magnitude of 1 (in the ideal lossless case) and phase of 0°. But it has been demonstrated that for the EBG structure (with or without vias) with square patches, the surface impedance strongly depends on the incidence angle and polarization type (TM or TE). As a consequence, these artificial surfaces tend to represent a magnetic wall only for a relatively small part of the angular spectrum of the antenna radiation [3,4]. So it is of interest to investigate the influence of the angular stability of the EBG structure on low profile antenna performance. In this paper, a wideband dipole antenna has been placed on top of the two different EBG structures without any vias. One of the shapes is square, which has poor angular stability and another one is based on Jerusalem cross which has been reported as more stable [4]. Characteristics of the wide band dipole antenna such as S11, radiation pattern and gain are investigated in details on the mentioned EBG structures. ANTENNA DESIGN A dipole antenna was used as a broadband linearly polarized antenna element. Fig. 1 shows the geometry of the dipole antenna made on 0.5 mm thick FR4 substrate ( 4 . 4 = r ε ), 2 mm above the EBG structures which consist of the element array on top of a 3 mm PEC backed substrate with dielectric constant of 2.2. Thus, the overall height of the dipole antenna from the bottom ground plane of the EBG structure is 5.5 mm. (0.09 GHz 5 λ ). Each side of the square forming the dipole is 17 mm. The balun, which is used to connect the coax to the dipole, is a wideband microstrip tapered balun . To achieve the same resonance frequency for the square and Jerusalem cross, the thickness and permittivity of the substrate has been assumed to be the same. But due to the effect of element shape on the resonance frequency, their cell sizes are slightly different. In Fig. 2 the unit cell of the square EBG and Jerusalem cross EBG with dimensions and the related reflection phases, which have been obtained by HFSS simulations, are shown. 253 0-7803-9444-5/06/$20.00 © 2006 IEEE.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"80 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":"125998034","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}

{"title":"Enhancing the Performance of Handset Antennas by Means of Groundplane Design","authors":"J. Anguera, I. Sanz, A. Sanz, D. Gala, A. Condes, C. Puente, J. Soler","doi":"10.1109/IWAT.2006.1608967","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608967","url":null,"abstract":"INTRODUCTION Mobile devices are in a constant state of evolution given the increasing features and frequencies available worldwide. Today, global handset functionality is becoming an important consideration influencing customer purchasing habits. Industry dynamics have increased the drive for smaller and multi-functional wireless devices. Antenna technology has played a key role in influencing the end form factor of these mobile devices because without the antenna the device is not wireless. The present paper shows a conventional design for dual-band operation (GSM900-DCS1800) and how it can be improved for a quad-band design (GSM850-GSM900-DCS1800-DCS1900) through the FracPlane technique. This technique encapsulates both basic shaping of a groundplane to a more sophisticated space-filling and/or multilevel design for further size reduction and multi-band performance enhancement [1,4].","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"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":"132477860","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}

{"title":"UWB Antennas in Body Area Networks","authors":"H. Ghannoum, C. Roblin, S. Bories","doi":"10.1109/IWAT.2006.1608994","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608994","url":null,"abstract":"The behavior of different UWB antennas in an on-body scenario is analyzed. Different orientations of directional antennas and different spacings between planar antennas and the body are investigated. Time domain channel parameters, e.g. mean delay and delay spread, are extracted from measurement data. The distribution of the channel parameters allows classification of the different antennas with respect to each parameter.","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":"131654212","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}

{"title":"Quad-Band Minimized Antenna Coexistence with Bluetooth for Mobile Application","authors":"W. Dou","doi":"10.1109/IWAT.2006.1608992","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608992","url":null,"abstract":"This paper proposes a novel coexistence design for both quad-band GSM antenna and Bluetooth antenna. The quad-band antenna is loaded with high dielectric constant materials for minimizing the size. Part of Bluetooth antenna has been etched on the PCB board for space-consuming. More than 20dB isolation is obtained over all the four GSM bands as well as ISM band.","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":"131055785","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}

{"title":"A Novel Anti-phase Dual Port Patch Antenna","authors":"M. Sarehraz, K. Buckle, E. Stefanakos, T. Weller","doi":"10.1109/IWAT.2006.1609014","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609014","url":null,"abstract":"-There are many variations to the theme of an antenna coupled with a high frequency rectifier (rectenna). A single diode approach is widely preferred for half-wave rectifying devices for rectennas because of its low loss and cost. However, this approach uses only half of the intercepted wave, unlike a full-wave bridge rectifier. On the other hand, a bridge rectifier is more lossy and expensive. This paper discusses the design of a novel dual port patch antenna, which is capable of full wave rectification with a circuit employing two diodes connected to its anti-phase electromagnetically coupled feeds. This novel design can increase the efficiency of rectifiers and reduces the cost of diode by 50%.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"39 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":"132579191","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}

{"title":"Characterisation of Printed EBG Surfaces for GPS Applications","authors":"M. Martínez-Vázquez, R. Baggen","doi":"10.1109/IWAT.2006.1608961","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608961","url":null,"abstract":"In this paper, two different EBG substrates are studied. Their behaviour is assessed both in terms of their farfield properties (reflection phase), and transmission characteristics (S21). Their performance is analysed through simulation, using an FDTD-based field solver, and measurements.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"1 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131438225","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}

{"title":"Miniaturization of Circularly Polarized Patch Antenna Using Circular Sector Element","authors":"T. Tanaka, M. Takahashi, K. Ito","doi":"10.1109/IWAT.2006.1609012","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1609012","url":null,"abstract":"INTRODUCTION It is commonly known that circularly polarized (CP) compact printed antennas are required in satellite communications [1], GPS, etc. Many designs of single feed circularly polarized compact microstrip antennas have been reported so far [2][3]. Compact single feed CP patch antennas can be obtained by using high permittivity substrate or slit loaded patch. However, in case of using high permittivity substrate, not only the resonant frequency but also the gain and band width performances are decreased. On the other hand, although slit loaded patch antennas can achieve a 36 % reduction in size, unequal slot length [2] or both slit and perturbation segments have to be optimized to obtain a CP radiation [3]. In this paper, a miniaturized circularly polarized patch antenna is presented. This patch antenna consists of a circular sector element with square notches. Normal circular sector patch antenna generates two different resonant modes. Theoretically, one mode induces a polarization that is perpendicular to the polarization of the second mode. In this study, the resonant frequency and relative phase of these two modes are controlled by varying only the size of the square notches allowing the generation of a CP. This time, the basic design and performances of such a circular sector patch antenna are numerically and experimentally discussed. It should be noted that the size of the proposed antenna is half the one of usual corner-truncated square patch antennas, hence enabling the composition of a compact circularly polarized patch array antenna.","PeriodicalId":162557,"journal":{"name":"IEEE International Workshop on Antenna Technology Small Antennas and Novel Metamaterials, 2006.","volume":"11 11 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":"126176326","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}

{"title":"Investigation into Techniques for Packaging Cosite Microstrip Patch Antennas into Handheld Devices","authors":"G. Alvey, H. Pan, J. Bernhard","doi":"10.1109/IWAT.2006.1608971","DOIUrl":"https://doi.org/10.1109/IWAT.2006.1608971","url":null,"abstract":"In many situations, it is advantageous to have multiple wireless systems located in very close proximity to one another. Placing the antennas of separate systems near each other, however, creates numerous problems. In order to limit the severity of the issues associated with cosite antenna configurations, the antennas should be very well isolated. The following work investigates a few possible approaches to help isolate two nearby linearly polarized microstrip patch antennas on a common ground plane.","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":"128707505","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}