Pub Date : 2012-03-05DOI: 10.1109/IWAT.2012.6178397
Yuanyun Liu, M. Guo, S. Zhong
A new slotted rectangular waveguide array antenna is introduced, which is constructed on the conformal cylindrical surface. Unlike other slotted waveguide arrays, this array has a beam with a large tilt angle from the broadside of the linear array. The array consists of a waveguide with inclined slots cutting in the narrow wall and a matching load at one end for the traveling wave operation. The antenna is designed and built using the analytical procedure combining with the commercial software. The radiation patterns and gain of the antenna are measured, and the experimental data obtained are compared with the theoretical results.
{"title":"Conformal slotted waveguide array antenna","authors":"Yuanyun Liu, M. Guo, S. Zhong","doi":"10.1109/IWAT.2012.6178397","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178397","url":null,"abstract":"A new slotted rectangular waveguide array antenna is introduced, which is constructed on the conformal cylindrical surface. Unlike other slotted waveguide arrays, this array has a beam with a large tilt angle from the broadside of the linear array. The array consists of a waveguide with inclined slots cutting in the narrow wall and a matching load at one end for the traveling wave operation. The antenna is designed and built using the analytical procedure combining with the commercial software. The radiation patterns and gain of the antenna are measured, and the experimental data obtained are compared with the theoretical results.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77767774","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.2012.6178401
M. Guo, S. Zhong
A high-efficiency microstrip-fed angled-dipole antenna has been developed. The printed dipole with an integrated balun features a broad operating bandwidth. The simulation of the antenna show that 7.4-10.5GHz band with VSWR less than 2 is obtained, and gain is more than 4.8dB. With choosing the proper dipole arms angle and with a radome, we can get the widest E-plane and H-plane beamwidth. Comparing the proposed antenna to the similar antennas, it has a simple structure and a high gain, also the E-plane and H-plane beamwidth can reach about 101° and 108°. Wide beamwidth and high gain is obtained, which satisfies the application of wireless communication.
{"title":"Broadband widebeamwidth printed dipole antenna","authors":"M. Guo, S. Zhong","doi":"10.1109/IWAT.2012.6178401","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178401","url":null,"abstract":"A high-efficiency microstrip-fed angled-dipole antenna has been developed. The printed dipole with an integrated balun features a broad operating bandwidth. The simulation of the antenna show that 7.4-10.5GHz band with VSWR less than 2 is obtained, and gain is more than 4.8dB. With choosing the proper dipole arms angle and with a radome, we can get the widest E-plane and H-plane beamwidth. Comparing the proposed antenna to the similar antennas, it has a simple structure and a high gain, also the E-plane and H-plane beamwidth can reach about 101° and 108°. Wide beamwidth and high gain is obtained, which satisfies the application of wireless communication.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81161722","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.2012.6178402
Jun-ping Geng, Xiang Liu, R. Jin, Xianling Liang
A directional wide band antenna with low profile on PEC is designed, The antenna includes 4 layers, the top layer is a slot radiation part, the middle two layers are the parasitic metal films with irregular rectangular holes, which are introduced by the joint of the EM software CST and the optimization method based on discrete coding. The bottom layer is the ground or PEC. The interval among these layers are air or medium, and the whole thickness of the antenna is less than 2.5cm. The antenna can work in 0.82GHz-2.1GHz with fixed directional main beam. Certainly, the radiation patterns all are upward during 0.82GHz-5.5GHz.
{"title":"Directional wideband antenna with low profile on PEC","authors":"Jun-ping Geng, Xiang Liu, R. Jin, Xianling Liang","doi":"10.1109/IWAT.2012.6178402","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178402","url":null,"abstract":"A directional wide band antenna with low profile on PEC is designed, The antenna includes 4 layers, the top layer is a slot radiation part, the middle two layers are the parasitic metal films with irregular rectangular holes, which are introduced by the joint of the EM software CST and the optimization method based on discrete coding. The bottom layer is the ground or PEC. The interval among these layers are air or medium, and the whole thickness of the antenna is less than 2.5cm. The antenna can work in 0.82GHz-2.1GHz with fixed directional main beam. Certainly, the radiation patterns all are upward during 0.82GHz-5.5GHz.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80023426","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.2012.6178387
C. Christodoulou, Y. Tawk, S. Jayaweera
A true cognitive radio does not have to be limited to achieving dynamic spectrum sharing (DSS), to simply an upgraded version of Sofware Defined Radio (SDR), or even to a number-crunching machine that can perform pre-defined cross-layer optimizations. Based on this broader view, we put-forth a new vision for a futuristic cognitive radio device: We define it to be a radio device that is capable of autonomously self-managing itself and self-reconfiguring to match its RF environment, using reconfigurable antennas, while continuously self-learning from its past experience. We call our proposed autonomous cognitive radios as Radiobots: They are the radio device equivalence of robots in mechanical engineering or Autobots in children's sci-fi movies! While every Radiobot will be a cognitive radio, none of the cognitive radios found in current literature can be considered as a Radiobot.
{"title":"Cognitive radio, reconfigurable antennas, and radiobots","authors":"C. Christodoulou, Y. Tawk, S. Jayaweera","doi":"10.1109/IWAT.2012.6178387","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178387","url":null,"abstract":"A true cognitive radio does not have to be limited to achieving dynamic spectrum sharing (DSS), to simply an upgraded version of Sofware Defined Radio (SDR), or even to a number-crunching machine that can perform pre-defined cross-layer optimizations. Based on this broader view, we put-forth a new vision for a futuristic cognitive radio device: We define it to be a radio device that is capable of autonomously self-managing itself and self-reconfiguring to match its RF environment, using reconfigurable antennas, while continuously self-learning from its past experience. We call our proposed autonomous cognitive radios as Radiobots: They are the radio device equivalence of robots in mechanical engineering or Autobots in children's sci-fi movies! While every Radiobot will be a cognitive radio, none of the cognitive radios found in current literature can be considered as a Radiobot.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76712316","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.2012.6178410
O. Yurduseven, David R. Smith, F. Bobor-Oyibo, S. Foti
This paper presents the design and results of a novel asymmetric H-plane horn antenna with an easily scanable, highly efficient asymmetric radiation pattern. This design offers a cost-effective and practical alternative to the current beam scanning horn antennas used in surveillance radars in which bulky and expensive switching and phase shifting circuits and time consuming rotation mechanisms are used for these antennas to feed the parabolic reflectors asymmetrically to improve the air and coastal scanning performance. In order to achieve that, the flares of the proposed asymmetric H-plane horn antenna, which is constructed from aluminum, are adjusted in a different way from the traditional horn antennas so that it is possible to shift the main lobe in a desired direction by setting the flare angle s differently. The near and far-field measurement results, which are in a good agreement with the simulation results, demonstrate the beam scanning performance of the proposed antenna through the use of adjustable asymmetric flares throughout the paper.
{"title":"Design of a highly efficient beam scanning asymmetric H-plane horn antenna","authors":"O. Yurduseven, David R. Smith, F. Bobor-Oyibo, S. Foti","doi":"10.1109/IWAT.2012.6178410","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178410","url":null,"abstract":"This paper presents the design and results of a novel asymmetric H-plane horn antenna with an easily scanable, highly efficient asymmetric radiation pattern. This design offers a cost-effective and practical alternative to the current beam scanning horn antennas used in surveillance radars in which bulky and expensive switching and phase shifting circuits and time consuming rotation mechanisms are used for these antennas to feed the parabolic reflectors asymmetrically to improve the air and coastal scanning performance. In order to achieve that, the flares of the proposed asymmetric H-plane horn antenna, which is constructed from aluminum, are adjusted in a different way from the traditional horn antennas so that it is possible to shift the main lobe in a desired direction by setting the flare angle s differently. The near and far-field measurement results, which are in a good agreement with the simulation results, demonstrate the beam scanning performance of the proposed antenna through the use of adjustable asymmetric flares throughout the paper.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82961226","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.2012.6178660
Yingsong Li, W. Li, Cheng-Yuan Liu, T. Jiang
A CPW-fed ultra-wideband monopole antenna with X-band rejection filter characteristic is proposed. The proposed rejection filter is obtained by using a stepped impedance resonator (SIR) with inner stub embedded in the CPW fed transmission signal line. The center frequency of the notch band can be controlled by adjusting the dimensions of the stepped impedance resonator and its inner stub. The proposed UWB antenna without SIR also has an impedance bandwidth of 131%. The antenna was designed, simulated and measured successfully. Experimental and numerical results show that the proposed antenna with compact size of 32×24mm2, has an impedance bandwidth range from 2.8GHz to 13.5GHz for voltage standing-wave ratio less than 2, expect the notch band frequency 8.2GHz-9.4GHz for X-band communication applications.
{"title":"Miniaturization circular wide slot ultra wideband antenna with X-band rejection filter function","authors":"Yingsong Li, W. Li, Cheng-Yuan Liu, T. Jiang","doi":"10.1109/IWAT.2012.6178660","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178660","url":null,"abstract":"A CPW-fed ultra-wideband monopole antenna with X-band rejection filter characteristic is proposed. The proposed rejection filter is obtained by using a stepped impedance resonator (SIR) with inner stub embedded in the CPW fed transmission signal line. The center frequency of the notch band can be controlled by adjusting the dimensions of the stepped impedance resonator and its inner stub. The proposed UWB antenna without SIR also has an impedance bandwidth of 131%. The antenna was designed, simulated and measured successfully. Experimental and numerical results show that the proposed antenna with compact size of 32×24mm2, has an impedance bandwidth range from 2.8GHz to 13.5GHz for voltage standing-wave ratio less than 2, expect the notch band frequency 8.2GHz-9.4GHz for X-band communication applications.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89196592","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.2012.6178683
N. Behdad, A. Masoumi, Y. Yusuf
Many small animals and insects possess acute directional hearing capabilities and are able to localize sound sources of interest with an astonishing degree of precision. The auditory systems of such insects are analogous to a two-element antenna array with closely spaced receiving elements. Despite this close spacing, however, the insects can detect the direction of arrival of a sound wave with an amazing degree of precision. In this paper, we discuss electrically small antenna arrays that mimic the sense of directional hearing of small animals and discuss the important design considerations and that must be taken into account in designing these structures.
{"title":"On the design and optimization of biomimetic electrically small antenna arrays","authors":"N. Behdad, A. Masoumi, Y. Yusuf","doi":"10.1109/IWAT.2012.6178683","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178683","url":null,"abstract":"Many small animals and insects possess acute directional hearing capabilities and are able to localize sound sources of interest with an astonishing degree of precision. The auditory systems of such insects are analogous to a two-element antenna array with closely spaced receiving elements. Despite this close spacing, however, the insects can detect the direction of arrival of a sound wave with an amazing degree of precision. In this paper, we discuss electrically small antenna arrays that mimic the sense of directional hearing of small animals and discuss the important design considerations and that must be taken into account in designing these structures.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88343778","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.2012.6178642
I. Liberal, I. Ederra, R. Gonzalo
Ferromagnetic wires are proposed to engineer artificial impedance surfaces. The solution to the scattering problem of a grid of wires in the proximity of a ground plane is solved, and explicit expressions for the equivalent surface impedance and reflection coefficient are formulated. Due to the wide variety of electromagnetic effects excited by the wires (magnetoimpedance effect, magnetic dipolar excitation, inter-coupling between both effects and higher order effects) ferromagnetic wires provide more design flexibility than state of the art impedance surfaces. As a practical example, we present the design of a thin electromagnetic absorber for the case of dominant magnetic dipolar excitation.
{"title":"Artificial impedance surfaces based on ferromagnetic wires","authors":"I. Liberal, I. Ederra, R. Gonzalo","doi":"10.1109/IWAT.2012.6178642","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178642","url":null,"abstract":"Ferromagnetic wires are proposed to engineer artificial impedance surfaces. The solution to the scattering problem of a grid of wires in the proximity of a ground plane is solved, and explicit expressions for the equivalent surface impedance and reflection coefficient are formulated. Due to the wide variety of electromagnetic effects excited by the wires (magnetoimpedance effect, magnetic dipolar excitation, inter-coupling between both effects and higher order effects) ferromagnetic wires provide more design flexibility than state of the art impedance surfaces. As a practical example, we present the design of a thin electromagnetic absorber for the case of dominant magnetic dipolar excitation.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82367769","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.2012.6178665
M. Jamlos, N. F. Kahar, M. Jusoh, P. Saad, M. Malek
The rice husk is investigated as an absorber of RF signals produced by hybrid antennas in this research. The fabricated element plank of rice husk is placed between the feed line of the beam shaping antenna and radiating element of the beam steering antenna. Beam shaping antenna is activated by particular PIN diode switches to radiate with four well-developed multi-formities of beam shaping radiation patterns. The patterns contain the gain of 3.6 dB, 7.2 dB, 9.9 dB and 14.64 dB with HPBW of 135°, 85°, 35° and 25° respectively. It is proven that the signal reliability is paramount since the system could self-elucidate the mutual coupling effects with the aid of rice husk element plank. Through the deployment of green technology RF absorber, the antenna is potentially an effective way to decrease the number of drop outs, lost connections and provides larger coverage.
{"title":"A feature of rice husk as an antenna absorber","authors":"M. Jamlos, N. F. Kahar, M. Jusoh, P. Saad, M. Malek","doi":"10.1109/IWAT.2012.6178665","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178665","url":null,"abstract":"The rice husk is investigated as an absorber of RF signals produced by hybrid antennas in this research. The fabricated element plank of rice husk is placed between the feed line of the beam shaping antenna and radiating element of the beam steering antenna. Beam shaping antenna is activated by particular PIN diode switches to radiate with four well-developed multi-formities of beam shaping radiation patterns. The patterns contain the gain of 3.6 dB, 7.2 dB, 9.9 dB and 14.64 dB with HPBW of 135°, 85°, 35° and 25° respectively. It is proven that the signal reliability is paramount since the system could self-elucidate the mutual coupling effects with the aid of rice husk element plank. Through the deployment of green technology RF absorber, the antenna is potentially an effective way to decrease the number of drop outs, lost connections and provides larger coverage.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74396202","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.2012.6178679
Si Li, Qi Zhu, H. Xin
In this paper, the transmission and radiation properties of carbon nanotube (CNT) array are investigated experimentally. It has been found that the transmission of the waveguide is improved by installing the CNT array in the rectangular waveguide, indicating the CNT arrays can transport microwave energy efficiently. By comparing the radiations of microstrip Yagi-Uda antenna and microstrip patch with and without CNT arrays, it has been found that the loads of CNT arrays can change the radiations significantly. When the CNTs are excited properly by the antennas, part of microwave energy transports along the CNT array and radiates at the end of the CNT array, changing the radiation of the original antennas.
{"title":"Experimental research on the microwave properties of carbon nanotube array","authors":"Si Li, Qi Zhu, H. Xin","doi":"10.1109/IWAT.2012.6178679","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178679","url":null,"abstract":"In this paper, the transmission and radiation properties of carbon nanotube (CNT) array are investigated experimentally. It has been found that the transmission of the waveguide is improved by installing the CNT array in the rectangular waveguide, indicating the CNT arrays can transport microwave energy efficiently. By comparing the radiations of microstrip Yagi-Uda antenna and microstrip patch with and without CNT arrays, it has been found that the loads of CNT arrays can change the radiations significantly. When the CNTs are excited properly by the antennas, part of microwave energy transports along the CNT array and radiates at the end of the CNT array, changing the radiation of the original antennas.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76861240","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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