Pub Date : 2018-03-01DOI: 10.1109/IWAT.2018.8379129
Rongjie Ma, Qi Wu, Jiexi Yin, Chen Yu, Haiming Wang, W. Hong
A compact broadband circularly polarized (CP) antenna over the artificial ground structure (AGS) is investigated. The CP radiation patch is comprised of a truncated corner square patch loaded by an extended strip. The AGS which is comprised of a 4 × 4 slot-loaded square metal patches changes the reflection phase in accordance with the polarization state of the incident wave. Broad bandwidth including impedance bandwidth, 3-dB axial ratio (AR) bandwidth, and gain bandwidth is achieved by properly combining the transmitted wave from the patch antenna and the reflected wave from the AGS. The measured results show that the AR bandwidth of the antenna is 14.0% (2.84–3.26 GHz), while the impedance bandwidth is 41.3% (2.48–3.72 GHz). The antenna gain at boresight is 5.35 dBic at 2.9 GHz. The gain fluctuation is less than 1 dB in the whole operating bandwidth. The overall antenna volume is 0.40 × 0.40 × 0.048λ0 at 3 GHz.
{"title":"Compact broadband circularly polarized microstrip antenna over artificial ground structure","authors":"Rongjie Ma, Qi Wu, Jiexi Yin, Chen Yu, Haiming Wang, W. Hong","doi":"10.1109/IWAT.2018.8379129","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379129","url":null,"abstract":"A compact broadband circularly polarized (CP) antenna over the artificial ground structure (AGS) is investigated. The CP radiation patch is comprised of a truncated corner square patch loaded by an extended strip. The AGS which is comprised of a 4 × 4 slot-loaded square metal patches changes the reflection phase in accordance with the polarization state of the incident wave. Broad bandwidth including impedance bandwidth, 3-dB axial ratio (AR) bandwidth, and gain bandwidth is achieved by properly combining the transmitted wave from the patch antenna and the reflected wave from the AGS. The measured results show that the AR bandwidth of the antenna is 14.0% (2.84–3.26 GHz), while the impedance bandwidth is 41.3% (2.48–3.72 GHz). The antenna gain at boresight is 5.35 dBic at 2.9 GHz. The gain fluctuation is less than 1 dB in the whole operating bandwidth. The overall antenna volume is 0.40 × 0.40 × 0.048λ0 at 3 GHz.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132200474","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379199
Fubao Wu, Youjin Yin, Jianfeng Zhai
In this paper, an ultra-wideband parallel negative feedback low noise amplifier (LNA) is designed and implemented. Based on the parallel negative feedback topology, an extraordinary high gain and a low noise figure (NF) can be achieved in the LNA operating from 2GHz to 8 GHz after the input and output impedance matching. Simulation and experimental results show that the LNA has a good performance. Measured results show that the LNA can give over 34-dB gain, less than 3.47-dB NF and 4.39-dB in-band gain flatness from 2 GHz to 8 GHz. It also provides less than −11-dB S11/S22 and over 5-dBm P1dB performance in the work band.
{"title":"An ultra-wideband parallel negative feedback low noise amplifier with extraordinary high gain","authors":"Fubao Wu, Youjin Yin, Jianfeng Zhai","doi":"10.1109/IWAT.2018.8379199","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379199","url":null,"abstract":"In this paper, an ultra-wideband parallel negative feedback low noise amplifier (LNA) is designed and implemented. Based on the parallel negative feedback topology, an extraordinary high gain and a low noise figure (NF) can be achieved in the LNA operating from 2GHz to 8 GHz after the input and output impedance matching. Simulation and experimental results show that the LNA has a good performance. Measured results show that the LNA can give over 34-dB gain, less than 3.47-dB NF and 4.39-dB in-band gain flatness from 2 GHz to 8 GHz. It also provides less than −11-dB S11/S22 and over 5-dBm P1dB performance in the work band.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127824245","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379180
Yuanhua Sun, Yihe Liu, Nianqing Tang, Dajun Xu, Y. Li, Yong-can Yu, Wei Dai, Quandeng Gou, Z. Du
This paper proposed a novel 100% bandwidth end-fire log-periodic monopole antenna array that can cover the wide bandwidth from 6GHz to 18GHz. The proposed log-periodic monopole antenna array removed the complicated feeding network in the design of the conventional log-periodic monopole antenna array, and corrected the errors discussion in design of the log-periodic monopole antenna array that is not formed the cross-inverting feeding on the ground plane. The proposed log-periodic monopole antenna uses the slot line as feed circuit to achieve the cross feed on the ground plane while keeping the symmetry of the antenna structure. The proposed antenna can keep good end-fire radiation over the whole operational frequency (6GHz-18GHz). The proposed log-periodic monopole antenna array has a compact size(45mm× 30mm × 12mm).
{"title":"The design of wideband end-fire monopole antenna array","authors":"Yuanhua Sun, Yihe Liu, Nianqing Tang, Dajun Xu, Y. Li, Yong-can Yu, Wei Dai, Quandeng Gou, Z. Du","doi":"10.1109/IWAT.2018.8379180","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379180","url":null,"abstract":"This paper proposed a novel 100% bandwidth end-fire log-periodic monopole antenna array that can cover the wide bandwidth from 6GHz to 18GHz. The proposed log-periodic monopole antenna array removed the complicated feeding network in the design of the conventional log-periodic monopole antenna array, and corrected the errors discussion in design of the log-periodic monopole antenna array that is not formed the cross-inverting feeding on the ground plane. The proposed log-periodic monopole antenna uses the slot line as feed circuit to achieve the cross feed on the ground plane while keeping the symmetry of the antenna structure. The proposed antenna can keep good end-fire radiation over the whole operational frequency (6GHz-18GHz). The proposed log-periodic monopole antenna array has a compact size(45mm× 30mm × 12mm).","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127836947","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379216
L. Tan, Y. Poo
A novel broadband concave paper antenna is proposed for low cost and conformal applications. The new design is a three-dimensional monopole antenna. Owing to the concave flexible paper substrate, the proposed antenna is easy to integrate with the packing case or the communication product. The broadband antenna can be used in the applications covering the 0.903–2.63 GHz band, such as 2G, 3G, and WLAN. Its gain is 3.8 dBi at 0.915 GHz, 3.5 dBi at 1.0 GHz, 2.8 dBi at 1.8 GHz, and 4.8 dBi at 2.45 GHz. Experiments validate the simulated results of our antenna.
{"title":"A broadband concave paper antenna","authors":"L. Tan, Y. Poo","doi":"10.1109/IWAT.2018.8379216","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379216","url":null,"abstract":"A novel broadband concave paper antenna is proposed for low cost and conformal applications. The new design is a three-dimensional monopole antenna. Owing to the concave flexible paper substrate, the proposed antenna is easy to integrate with the packing case or the communication product. The broadband antenna can be used in the applications covering the 0.903–2.63 GHz band, such as 2G, 3G, and WLAN. Its gain is 3.8 dBi at 0.915 GHz, 3.5 dBi at 1.0 GHz, 2.8 dBi at 1.8 GHz, and 4.8 dBi at 2.45 GHz. Experiments validate the simulated results of our antenna.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115413048","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379226
M. Al-Nuaimi, W. Hong, Yejun He
This paper presents the design of 1-bit low scattering reflective surface that can efficiently manipulate the shape and level of the backscattered RCS far-field pattern of a metal object at millimeter wave. The proposed 1-bit surface is designed based on reflection phase cancellation principle where the proposed unit cell of a modified Venus-like shape metallic resonator (as “0” element) and its mirrored-unit cell (as “1” element) are randomly distributed across the surface aperture to realize the required phase difference. The proposed surface can scatter (diffuse) the incident EM-wave into several low level lobes in many directions in the half space in front of the surface, and as a result, dramatically reduce the backscattering and RCS. The proposed surface has good backscattering characteristics under both normal and oblique incidence of EM-waves.
{"title":"Manipulation of backscattered EM-waves using 1-bit coding reflective surface at mmWave","authors":"M. Al-Nuaimi, W. Hong, Yejun He","doi":"10.1109/IWAT.2018.8379226","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379226","url":null,"abstract":"This paper presents the design of 1-bit low scattering reflective surface that can efficiently manipulate the shape and level of the backscattered RCS far-field pattern of a metal object at millimeter wave. The proposed 1-bit surface is designed based on reflection phase cancellation principle where the proposed unit cell of a modified Venus-like shape metallic resonator (as “0” element) and its mirrored-unit cell (as “1” element) are randomly distributed across the surface aperture to realize the required phase difference. The proposed surface can scatter (diffuse) the incident EM-wave into several low level lobes in many directions in the half space in front of the surface, and as a result, dramatically reduce the backscattering and RCS. The proposed surface has good backscattering characteristics under both normal and oblique incidence of EM-waves.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117039496","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379248
T. Fukusako, Nobuhiro Imaizumi, R. Kuse
A low-profile antenna using four loop elements for radiating vertical polarization. The multi-directional beam is directed in four directions at 6.2 GHz. The simulated characteristics and the beam patterns show good agreements with measured results. The proposed antenna has only 3.2 mm thickness, and the average gain is 5.3 dBi.
{"title":"An low-profile 4-multibeam antenna radiating parallel to ground plane","authors":"T. Fukusako, Nobuhiro Imaizumi, R. Kuse","doi":"10.1109/IWAT.2018.8379248","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379248","url":null,"abstract":"A low-profile antenna using four loop elements for radiating vertical polarization. The multi-directional beam is directed in four directions at 6.2 GHz. The simulated characteristics and the beam patterns show good agreements with measured results. The proposed antenna has only 3.2 mm thickness, and the average gain is 5.3 dBi.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115769077","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379134
T. Guo, Qingfeng Zhang, Xiaoxiang Hou, A. Kandwal, Bing Li
A modified leaky-wave antenna based on periodic patch is presented in this paper. A new technique introducing coupled lines with via holes is proposed to overcome the open stop band problem in periodically loaded leaky wave array antenna designs. A wideband bandwidth is obtained along with high antenna gain of about 15 dBi for the proposed leaky wave antenna. This periodic leaky wave antenna loaded with periodic symmetric patches is also providing frequency scanning from −40 deg to 40 deg. through broadside.
{"title":"Symmetry leaky-wave antenna without gain degradation at broadside","authors":"T. Guo, Qingfeng Zhang, Xiaoxiang Hou, A. Kandwal, Bing Li","doi":"10.1109/IWAT.2018.8379134","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379134","url":null,"abstract":"A modified leaky-wave antenna based on periodic patch is presented in this paper. A new technique introducing coupled lines with via holes is proposed to overcome the open stop band problem in periodically loaded leaky wave array antenna designs. A wideband bandwidth is obtained along with high antenna gain of about 15 dBi for the proposed leaky wave antenna. This periodic leaky wave antenna loaded with periodic symmetric patches is also providing frequency scanning from −40 deg to 40 deg. through broadside.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116253206","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379159
Shohei Matsuhara, K. Saito, H. Kawahira, Nobuyoshi Takeshita, Tomoyuki Tajima
In recent years, various types of medical applications of microwave have widely been investigated and reported. In this paper, a catheter, which ablates extravascular nerve by the thermal effect of microwave, is introduced. In addition, heating characteristics of the catheter are evaluated by numerical calculations. As a result, temperature distributions around the catheter were revealed and the usefulness of a denervation catheter using microwave was suggested.
{"title":"Development and evaluation of denervation catheter by use of microwave energy","authors":"Shohei Matsuhara, K. Saito, H. Kawahira, Nobuyoshi Takeshita, Tomoyuki Tajima","doi":"10.1109/IWAT.2018.8379159","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379159","url":null,"abstract":"In recent years, various types of medical applications of microwave have widely been investigated and reported. In this paper, a catheter, which ablates extravascular nerve by the thermal effect of microwave, is introduced. In addition, heating characteristics of the catheter are evaluated by numerical calculations. As a result, temperature distributions around the catheter were revealed and the usefulness of a denervation catheter using microwave was suggested.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"604 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116458528","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379189
Jia Fang, M. Jin, Xiaolin Zhang
A 45deg oblique polarized 3:1 bandwidth ±30deg scan antenna array is designed. The antenna is the printed log-periodic antenna made by dielectric substrate, and feed by a semirigid coaxial line. It has some advantages such as little weight, easy manufacture, high accuracy and consistency. Some antenna cells are made and measured. Accord to the VSWR measured results, some research and improvement is done with the antenna. After be measured, the VSWRs of the antenna at 3:1 bandwidth with ±30° scan angle are blew 2.5. The lobe diagrams of the antenna shows the antenna array can achieve ±30° scan at horizontal direction.
{"title":"An UWB printed log-periodic array antenna","authors":"Jia Fang, M. Jin, Xiaolin Zhang","doi":"10.1109/IWAT.2018.8379189","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379189","url":null,"abstract":"A 45deg oblique polarized 3:1 bandwidth ±30deg scan antenna array is designed. The antenna is the printed log-periodic antenna made by dielectric substrate, and feed by a semirigid coaxial line. It has some advantages such as little weight, easy manufacture, high accuracy and consistency. Some antenna cells are made and measured. Accord to the VSWR measured results, some research and improvement is done with the antenna. After be measured, the VSWRs of the antenna at 3:1 bandwidth with ±30° scan angle are blew 2.5. The lobe diagrams of the antenna shows the antenna array can achieve ±30° scan at horizontal direction.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124478805","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 : 2018-03-01DOI: 10.1109/IWAT.2018.8379224
A. Kabalan, A. Sharaiha, A. Tarot, J-L. Mattei, D. Souriou, P. Quéffélec
This article presents the miniaturization of an UWB planar monopole antenna covering the VHF band through the use of low loss Magneto-Dielectric Materials (MDM). A new structure of the planar monopole antenna using slots have been proposed, which allows to reach high miniaturization rates by covering partially the antenna with MDM. This new monopole structure shows a miniaturization rate of 60% by covering about only 12 % of the antenna surface by the MDM.
{"title":"Impact of magneto-dielectric materials on the miniaturization of UWB monopole antennas","authors":"A. Kabalan, A. Sharaiha, A. Tarot, J-L. Mattei, D. Souriou, P. Quéffélec","doi":"10.1109/IWAT.2018.8379224","DOIUrl":"https://doi.org/10.1109/IWAT.2018.8379224","url":null,"abstract":"This article presents the miniaturization of an UWB planar monopole antenna covering the VHF band through the use of low loss Magneto-Dielectric Materials (MDM). A new structure of the planar monopole antenna using slots have been proposed, which allows to reach high miniaturization rates by covering partially the antenna with MDM. This new monopole structure shows a miniaturization rate of 60% by covering about only 12 % of the antenna surface by the MDM.","PeriodicalId":212550,"journal":{"name":"2018 International Workshop on Antenna Technology (iWAT)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123911631","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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