Pub Date : 2012-03-05DOI: 10.1109/IWAT.2012.6178659
Feng Zhao, Wei Hua
A novel compact size microstrip-line fed patch antenna used for WLAN operation in the 5.2- and 5.8-GHz is proposed. The antenna consists of the horizontal “H-shapped” patch in the top side, and the I-slot patch with chamfer in the bottom side. The size of the antenna is 15mm×12mm×1mm, and the dielectric constant is 2.65. The resonant frequency of the antenna is at 5.2/5.8GHz. The simulated results is obtained, and show good dual-frequency operation, with impedance bandwidth (return loss: -10dB definition) of 110MHz (5.17~5.28GHz) and 370MHz (5.64~6.01GHz), antenna gain of 1.92dBi and 2.57dBi, respectively. The radiation pattern of dual-frequency is omnidirectional.
{"title":"Compact size microstrip-line-fed antenna for WLAN application","authors":"Feng Zhao, Wei Hua","doi":"10.1109/IWAT.2012.6178659","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178659","url":null,"abstract":"A novel compact size microstrip-line fed patch antenna used for WLAN operation in the 5.2- and 5.8-GHz is proposed. The antenna consists of the horizontal “H-shapped” patch in the top side, and the I-slot patch with chamfer in the bottom side. The size of the antenna is 15mm×12mm×1mm, and the dielectric constant is 2.65. The resonant frequency of the antenna is at 5.2/5.8GHz. The simulated results is obtained, and show good dual-frequency operation, with impedance bandwidth (return loss: -10dB definition) of 110MHz (5.17~5.28GHz) and 370MHz (5.64~6.01GHz), antenna gain of 1.92dBi and 2.57dBi, respectively. The radiation pattern of dual-frequency is omnidirectional.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"249-252"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90886432","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178411
J.-M. Boccard, L. Reindl
This paper presents a novel antenna combination for wireless physical measurements by using Surface Acoustic Wave (SAW) resonators on rotating machinery. The interrogation system is composed of a transceiver based on the RADAR strategy, connected to a magnetic loop antenna. A temperature SAW sensor working in the Industrial, Scientific and Medical (ISM) band [433.05 MHz - 434.79 MHz] is embedded on a three centimeters diameter steel axis and connected to a ceramic chip antenna allowing the wireless interrogation in this particular environment. Simulation, transmission and dynamic temperature measurement results are presented.
{"title":"Ceramic and magnetic loop antennas for wireless interrogation of SAW resonators on rotating machinery","authors":"J.-M. Boccard, L. Reindl","doi":"10.1109/IWAT.2012.6178411","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178411","url":null,"abstract":"This paper presents a novel antenna combination for wireless physical measurements by using Surface Acoustic Wave (SAW) resonators on rotating machinery. The interrogation system is composed of a transceiver based on the RADAR strategy, connected to a magnetic loop antenna. A temperature SAW sensor working in the Industrial, Scientific and Medical (ISM) band [433.05 MHz - 434.79 MHz] is embedded on a three centimeters diameter steel axis and connected to a ceramic chip antenna allowing the wireless interrogation in this particular environment. Simulation, transmission and dynamic temperature measurement results are presented.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"112-115"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83907097","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178389
B. Quist, M. Jensen
While secret encryption keys are commonly-used for securing wireless transmissions, establishment of such keys has traditionally been accomplished using computational techniques at the higher layers of the wireless communication protocol stack. However, the multipath electromagnetic propagation typical of many environments can also be an excellent source of random variables useful for encryption key generation. Furthermore, antennas play an important role in how the transmitter and receiver excite or sense the channel and therefore become a critical component in the performance of techniques that exploit the multipath channel for key establishment. This paper focuses on how using multiple antennas can dramatically improve the performance of such key establishment methods.
{"title":"The impact of multiple antennas in physical layer encryption key establishment","authors":"B. Quist, M. Jensen","doi":"10.1109/IWAT.2012.6178389","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178389","url":null,"abstract":"While secret encryption keys are commonly-used for securing wireless transmissions, establishment of such keys has traditionally been accomplished using computational techniques at the higher layers of the wireless communication protocol stack. However, the multipath electromagnetic propagation typical of many environments can also be an excellent source of random variables useful for encryption key generation. Furthermore, antennas play an important role in how the transmitter and receiver excite or sense the channel and therefore become a critical component in the performance of techniques that exploit the multipath channel for key establishment. This paper focuses on how using multiple antennas can dramatically improve the performance of such key establishment methods.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"22 1","pages":"24-27"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77543982","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178674
D. Titz, F. Ferrero, C. Luxey, P. Brachat, G. Jacquemod
In this paper, we present a radiation pattern measurement setup for 60 GHz antennas available at the Université Nice-Sophia Antipolis. We especially detail the measurements of several antenna-types fabricated in different technologies and radiating in different directions. Our measurement setup is compared with state-of-the-art facilities. In the conclusion, we finally describe possible enhancements and future evolutions.
{"title":"Radiation pattern characterization of antennas at millimeter-wave frequencies","authors":"D. Titz, F. Ferrero, C. Luxey, P. Brachat, G. Jacquemod","doi":"10.1109/IWAT.2012.6178674","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178674","url":null,"abstract":"In this paper, we present a radiation pattern measurement setup for 60 GHz antennas available at the Université Nice-Sophia Antipolis. We especially detail the measurements of several antenna-types fabricated in different technologies and radiating in different directions. Our measurement setup is compared with state-of-the-art facilities. In the conclusion, we finally describe possible enhancements and future evolutions.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"35 1","pages":"311-314"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78922768","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178412
M. Jamlos, N. F. Kahar, M. Jusoh, P. Saad, M. Malek
A Hybrid Reconfigurable antenna is proposed in this paper. The antenna is a combination of beam steering and beam shaping RLSA antenna. The beam steering ability is prominently influenced by the feedline's spiral and radius while beam shaping's forte is depending on the 45° of the aperture slots as well as `bridge' feed line. The spiral feed line and bridge feed line are incorporated with PIN diode switches to enable the multiformities outcome on radiation patterns. The combination of beam steering antenna with beam shaping antenna formed a hybrid four layers configuration. This novel hybrid antenna collectively contribute to the well-developed of 9 multiformities radiation patterns. This hybrid antenna is proficient of steering its radiated beam at four angles; 0°/360°, 90°, 180°, and 270°. Meanwhile, the proposed antenna is able to boost with four different gain of beam shaped radiation patterns; 3.6 dB, 7.2 dBi, 9.9 dBi and 14.64 dBi.
{"title":"An effect of stack configuration of Reconfigurable antenna","authors":"M. Jamlos, N. F. Kahar, M. Jusoh, P. Saad, M. Malek","doi":"10.1109/IWAT.2012.6178412","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178412","url":null,"abstract":"A Hybrid Reconfigurable antenna is proposed in this paper. The antenna is a combination of beam steering and beam shaping RLSA antenna. The beam steering ability is prominently influenced by the feedline's spiral and radius while beam shaping's forte is depending on the 45° of the aperture slots as well as `bridge' feed line. The spiral feed line and bridge feed line are incorporated with PIN diode switches to enable the multiformities outcome on radiation patterns. The combination of beam steering antenna with beam shaping antenna formed a hybrid four layers configuration. This novel hybrid antenna collectively contribute to the well-developed of 9 multiformities radiation patterns. This hybrid antenna is proficient of steering its radiated beam at four angles; 0°/360°, 90°, 180°, and 270°. Meanwhile, the proposed antenna is able to boost with four different gain of beam shaped radiation patterns; 3.6 dB, 7.2 dBi, 9.9 dBi and 14.64 dBi.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"80 1","pages":"116-119"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79736608","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178393
L. Matekovits, A. De Sabata
A highly selective, multiband, passive unit cell is introduced. The device is realized by incorporating a high impedance, periodic, patterned metal surface between two layers of dielectric in-between two parallel metal planes. The patterned surface is connected to the metal planes through metalized vias and through metal pins. The properties of the device have been assessed by numerically computing the dispersion diagram using a commercial software. The narrow pass-bands present in the microwave frequency range makes the structure well-suited for filters intended for direct incorporation in antenna feeders in view of wireless applications. Q-factor as high as 300 can be achieved.
{"title":"Highly selective multiband metamaterial band-pass filter","authors":"L. Matekovits, A. De Sabata","doi":"10.1109/IWAT.2012.6178393","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178393","url":null,"abstract":"A highly selective, multiband, passive unit cell is introduced. The device is realized by incorporating a high impedance, periodic, patterned metal surface between two layers of dielectric in-between two parallel metal planes. The patterned surface is connected to the metal planes through metalized vias and through metal pins. The properties of the device have been assessed by numerically computing the dispersion diagram using a commercial software. The narrow pass-bands present in the microwave frequency range makes the structure well-suited for filters intended for direct incorporation in antenna feeders in view of wireless applications. Q-factor as high as 300 can be achieved.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"3 1","pages":"40-43"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78516368","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178635
U. Azad, Y. Wang
An inductively coupled near-field wireless power transmission system, consisting of transmitter and receiver coils connected via appropriate impedance matching network to source and load respectively, is analyzed to address how the properties of antennas and impedance terminations impact on the performance of such a system. This is achieved by deriving the power transfer relationship of inductively coupled resonant loops based on their equivalent circuit model. It leads to a concise formulation called near-field power transfer equation, which expresses the transferred power as a function of dimensions and intrinsic quality factors of the loops, distance between the loops, and terminating impedances at both the transmitter and the receiver. Experimental results validate the derived near-field power transfer expression.
{"title":"Analysis and experimental results for an inductively coupled near-field power transmission system","authors":"U. Azad, Y. Wang","doi":"10.1109/IWAT.2012.6178635","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178635","url":null,"abstract":"An inductively coupled near-field wireless power transmission system, consisting of transmitter and receiver coils connected via appropriate impedance matching network to source and load respectively, is analyzed to address how the properties of antennas and impedance terminations impact on the performance of such a system. This is achieved by deriving the power transfer relationship of inductively coupled resonant loops based on their equivalent circuit model. It leads to a concise formulation called near-field power transfer equation, which expresses the transferred power as a function of dimensions and intrinsic quality factors of the loops, distance between the loops, and terminating impedances at both the transmitter and the receiver. Experimental results validate the derived near-field power transfer expression.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"151 1","pages":"157-160"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77115447","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178400
S. Y. S. Bhamidipati, R. Kubichek
This paper investigates a hybrid analog/digital beam former (ADBF). Traditional analog beam formers (ABF) steer a single beam using a single transceiver, power splitter/combiner, and electronically controlled analog phase shifters. In contrast modern digital beam formed arrays (DBF) or `smart antennas' use separate transceiver chains, A/D and D/A converters, and DSPs. This enables direct digital control of array weights to optimize criteria such as mean square error (MSE) or signal-to-interference ratio (SIR) in real time. DBF technologies are effective but are not suitable for every application due to their relative high cost and complexity. The technique proposed here is similar to ADBF approaches using a single transceiver and analog phase shifters, but phase shifters are digitally controlled to provide flexible multiple nulls and beams defined in real time.
{"title":"Low complexity hybrid analog/digital phased array for ad-hoc networks","authors":"S. Y. S. Bhamidipati, R. Kubichek","doi":"10.1109/IWAT.2012.6178400","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178400","url":null,"abstract":"This paper investigates a hybrid analog/digital beam former (ADBF). Traditional analog beam formers (ABF) steer a single beam using a single transceiver, power splitter/combiner, and electronically controlled analog phase shifters. In contrast modern digital beam formed arrays (DBF) or `smart antennas' use separate transceiver chains, A/D and D/A converters, and DSPs. This enables direct digital control of array weights to optimize criteria such as mean square error (MSE) or signal-to-interference ratio (SIR) in real time. DBF technologies are effective but are not suitable for every application due to their relative high cost and complexity. The technique proposed here is similar to ADBF approaches using a single transceiver and analog phase shifters, but phase shifters are digitally controlled to provide flexible multiple nulls and beams defined in real time.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"68-71"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74494484","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178641
N. Khiabani, Yi Huang, Yao-chun Shen, S. Boyes
In designing terahertz (THz) antennas with high output power and/or high optical-THz conversion efficiency, the photoconductor property is an important consideration. According to the type of the optical excitation, THz antennas can be divided into two categories: THz photoconductive antennas in a pulsed system and THz photomixing antennas in a Continuous-Wave (CW) system. How different excitation types can affect the performance of the antenna is an important issue in THz systems. Thus, the aim of this paper is to investigate and compare THz photoconductive antennas and THz photomixing antennas from an important design parameter point of view; namely the conductance of the photoconductive material substrate which acts as the source for a PC antenna. Through numerical analyses of example systems, it is shown that source resistance of a THz antenna in a CW system is greater than those in a pulsed system. Further, an important practical system setting, the dependency of alignment of two beams in CW systems on antenna gap size is also investigated. It is illustrated that mixing efficiency for large gap antennas is more sensitive to angle between two beams.
{"title":"THz photoconductive antennas in pulsed systems and CW systems","authors":"N. Khiabani, Yi Huang, Yao-chun Shen, S. Boyes","doi":"10.1109/IWAT.2012.6178641","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178641","url":null,"abstract":"In designing terahertz (THz) antennas with high output power and/or high optical-THz conversion efficiency, the photoconductor property is an important consideration. According to the type of the optical excitation, THz antennas can be divided into two categories: THz photoconductive antennas in a pulsed system and THz photomixing antennas in a Continuous-Wave (CW) system. How different excitation types can affect the performance of the antenna is an important issue in THz systems. Thus, the aim of this paper is to investigate and compare THz photoconductive antennas and THz photomixing antennas from an important design parameter point of view; namely the conductance of the photoconductive material substrate which acts as the source for a PC antenna. Through numerical analyses of example systems, it is shown that source resistance of a THz antenna in a CW system is greater than those in a pulsed system. Further, an important practical system setting, the dependency of alignment of two beams in CW systems on antenna gap size is also investigated. It is illustrated that mixing efficiency for large gap antennas is more sensitive to angle between two beams.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"77 1","pages":"181-184"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90564822","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178394
L. Matekovits, D. Thalakotuna, M. Heimlich, K. Esselle
A recently proposed tunable microwave periodic structure requires many switches to dynamically change its microwave propagation and radiation characteristics. The performance of a discrete Field Effect Transistor (FET) switch package, suitable for the structure, is investigated in two potential configurations. In one configuration, the switch is co-planar with the ground plane and in the other it is on a different surface. Measurements made on two test boards confirm that when the switches are turned “on” the switch insertion losses are not significantly different between the two configurations. However when the switches are turned “off”, locating the switches on the ground plane provide better isolation between RF ports.
{"title":"Investigation on FET switch integration techniques for a tunable microwave periodic structure","authors":"L. Matekovits, D. Thalakotuna, M. Heimlich, K. Esselle","doi":"10.1109/IWAT.2012.6178394","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178394","url":null,"abstract":"A recently proposed tunable microwave periodic structure requires many switches to dynamically change its microwave propagation and radiation characteristics. The performance of a discrete Field Effect Transistor (FET) switch package, suitable for the structure, is investigated in two potential configurations. In one configuration, the switch is co-planar with the ground plane and in the other it is on a different surface. Measurements made on two test boards confirm that when the switches are turned “on” the switch insertion losses are not significantly different between the two configurations. However when the switches are turned “off”, locating the switches on the ground plane provide better isolation between RF ports.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"6 1","pages":"44-47"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87110308","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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