Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7413117
Jiepei Shi, Juan Chen, W. Fu
This paper presents a new absorber to suppress the aperture-cavity resonance. The absorber consists of two nested metal square rings which can absorb high frequency and low frequency electromagnetic wave, respectively. The simulation results demonstrate that the shielding effectiveness of the cavity which is loaded with the absorber can be improved. At its first and second resonant frequencies, the shielding effectiveness can be increased by about 35dB and 16dB, respectively.
{"title":"Study on suppression of aperture-cavity resonance by nested square rings absorber","authors":"Jiepei Shi, Juan Chen, W. Fu","doi":"10.1109/APMC.2015.7413117","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413117","url":null,"abstract":"This paper presents a new absorber to suppress the aperture-cavity resonance. The absorber consists of two nested metal square rings which can absorb high frequency and low frequency electromagnetic wave, respectively. The simulation results demonstrate that the shielding effectiveness of the cavity which is loaded with the absorber can be improved. At its first and second resonant frequencies, the shielding effectiveness can be increased by about 35dB and 16dB, respectively.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121918318","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413084
S. McCabe, Jonathan B. Scott
The standard technique for determining the compatibility of medical implants to the magnetic and RF fields present in Magnetic Resonance Imaging (MRI), requires access to an MRI machine. For implants comprising metals of mostly the non-ferrous kind, it is only the RF field of an MRI machine that is of concern. Implant electrodes can concentrate the RF field in the surrounding tissue and give rise to joule heating. The inherent design of Spinal Cord Stimulators (SCS) and Deep Brain Stimulators (DBS) makes these implants particularly susceptible to hazardous levels of RF heating. We propose a technique that offers a quick and indicative assessment of the compatibility of implant leads to the RF field in 3-Tesla MRI, without needing access to an MRI machine. A dipole antenna, driven by a power amplifier and Continuous Wave (CW), injects RF energy into a gelled saline phantom. The heating in the gel near a test implant electrode is monitored with a fiber optic thermometer. The results are calibrated against measurements made in a 3-Tesla MRI machine.
{"title":"Technique to assess the compatibility of medical implants to the RF field in MRI","authors":"S. McCabe, Jonathan B. Scott","doi":"10.1109/APMC.2015.7413084","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413084","url":null,"abstract":"The standard technique for determining the compatibility of medical implants to the magnetic and RF fields present in Magnetic Resonance Imaging (MRI), requires access to an MRI machine. For implants comprising metals of mostly the non-ferrous kind, it is only the RF field of an MRI machine that is of concern. Implant electrodes can concentrate the RF field in the surrounding tissue and give rise to joule heating. The inherent design of Spinal Cord Stimulators (SCS) and Deep Brain Stimulators (DBS) makes these implants particularly susceptible to hazardous levels of RF heating. We propose a technique that offers a quick and indicative assessment of the compatibility of implant leads to the RF field in 3-Tesla MRI, without needing access to an MRI machine. A dipole antenna, driven by a power amplifier and Continuous Wave (CW), injects RF energy into a gelled saline phantom. The heating in the gel near a test implant electrode is monitored with a fiber optic thermometer. The results are calibrated against measurements made in a 3-Tesla MRI machine.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116753002","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413308
Dandan Liu, L. Gui, M. R. Akram
This paper discusses a novel and a practical method to generate radio beams carrying Orbital Angular Momentum (OAM) by using slot antenna array. Different modes of OAM waves can be produced by keeping a constant phase delay between adjacent feed elements. This slot antenna array is designed and simulated at 7.8 GHz by using full wave simulator. Moreover, the mutual coupling between elements will be discussed in this paper.
{"title":"Generation of OAM radio waves using slot antenna array","authors":"Dandan Liu, L. Gui, M. R. Akram","doi":"10.1109/APMC.2015.7413308","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413308","url":null,"abstract":"This paper discusses a novel and a practical method to generate radio beams carrying Orbital Angular Momentum (OAM) by using slot antenna array. Different modes of OAM waves can be produced by keeping a constant phase delay between adjacent feed elements. This slot antenna array is designed and simulated at 7.8 GHz by using full wave simulator. Moreover, the mutual coupling between elements will be discussed in this paper.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129551212","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}
A new form of the orbital angular momentum (OAM) carried electromagnetic wave termed as plane spiral OAM (PSOAM) electromagnetic wave is proposed for the first time in this paper. This electromagnetic wave possesses the fundamental characters of the OAM-carrying waves, i.e. a spiral phase distribution, yet propagates along the transverse direction. Hence the phase singularity of this wave is in the radiation source itself, which can avoid the wide "dark zone" derived problems in the long distance transmission. The PSOAM electromagnetic waves with different OAM modes can be easily multiplexed as no divergence exists. Owing to the unique wave beam characteristics, some potential applications in wireless communication and electromagnetic sensing are preliminarily discussed.
{"title":"Plane spiral orbital angular momentum electromagnetic wave","authors":"Shilie Zheng, Zhuofan Zhang, Yu Pan, Xiaofeng Jin, H. Chi, Xianmin Zhang","doi":"10.1109/APMC.2015.7413418","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413418","url":null,"abstract":"A new form of the orbital angular momentum (OAM) carried electromagnetic wave termed as plane spiral OAM (PSOAM) electromagnetic wave is proposed for the first time in this paper. This electromagnetic wave possesses the fundamental characters of the OAM-carrying waves, i.e. a spiral phase distribution, yet propagates along the transverse direction. Hence the phase singularity of this wave is in the radiation source itself, which can avoid the wide \"dark zone\" derived problems in the long distance transmission. The PSOAM electromagnetic waves with different OAM modes can be easily multiplexed as no divergence exists. Owing to the unique wave beam characteristics, some potential applications in wireless communication and electromagnetic sensing are preliminarily discussed.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129579486","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 : 2015-12-01DOI: 10.1109/APMC.2015.7412958
Cheng-Hsing Hsu, Chia-Hao Chang, Wan-Yu Hsieh, C. Tseng, Wen-Shiush Chen, Jenn-Sen Lin
A planar multilateral monopole antenna with rabbet structure for ultra-wideband (UWB) application is proposed and experimentally studied. By modified a rabbet structure on the multilateral patch, a UWB response has been is improved. The proposed antenna has wide impedance bandwidth from 2.4 GHz to more than 11 GHz with better than -10 dB return loss. The design is demonstrated assuming FR4 substrate with a thickness of 1.6 mm, and the size of the antenna is 40 mm×50 mm. Details of the proposed antenna design and simulation results for UWB operations are presented and discussed.
{"title":"Design of multilateral monopole planar antenna with rabbet structure for UWB applications","authors":"Cheng-Hsing Hsu, Chia-Hao Chang, Wan-Yu Hsieh, C. Tseng, Wen-Shiush Chen, Jenn-Sen Lin","doi":"10.1109/APMC.2015.7412958","DOIUrl":"https://doi.org/10.1109/APMC.2015.7412958","url":null,"abstract":"A planar multilateral monopole antenna with rabbet structure for ultra-wideband (UWB) application is proposed and experimentally studied. By modified a rabbet structure on the multilateral patch, a UWB response has been is improved. The proposed antenna has wide impedance bandwidth from 2.4 GHz to more than 11 GHz with better than -10 dB return loss. The design is demonstrated assuming FR4 substrate with a thickness of 1.6 mm, and the size of the antenna is 40 mm×50 mm. Details of the proposed antenna design and simulation results for UWB operations are presented and discussed.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128376686","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413532
Jianquan Huang, Feng Qiu, Chunzhi Jiang, D. Lei, Zhenghua Tang, Min Yao, Q. Chu
A circularly polarized (CP) substrate integrated waveguide (SIW) cavity-backed antenna based on slot split ring resonator is proposed. The circularly polarized wave is generated by a split ring-slot etched in the upper metal layer of SIW cavity resonator. A simple coaxial probe is employed to excite this slot split ring resonator and radiate left-handed circularly polarized (LHCP) wave. The proposed antenna retains the advantages of both conventional planar antennas and metallic cavity backed antennas, including compact sizes of 14×14 mm2, light weight, easy low cost fabrication and high gain, low cross polarized level. It is experimentally proved that an impedance bandwidth of 10.5% for the reflection coefficient less than -10 dB, the axial ratio (AR) bandwidth of 2.06% for AR less than 3 dB, and the LHCP gain 5.2 dBi has been obtained.
{"title":"Compact circularly polarized SIW cavity-backed antenna based on slot SRR","authors":"Jianquan Huang, Feng Qiu, Chunzhi Jiang, D. Lei, Zhenghua Tang, Min Yao, Q. Chu","doi":"10.1109/APMC.2015.7413532","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413532","url":null,"abstract":"A circularly polarized (CP) substrate integrated waveguide (SIW) cavity-backed antenna based on slot split ring resonator is proposed. The circularly polarized wave is generated by a split ring-slot etched in the upper metal layer of SIW cavity resonator. A simple coaxial probe is employed to excite this slot split ring resonator and radiate left-handed circularly polarized (LHCP) wave. The proposed antenna retains the advantages of both conventional planar antennas and metallic cavity backed antennas, including compact sizes of 14×14 mm2, light weight, easy low cost fabrication and high gain, low cross polarized level. It is experimentally proved that an impedance bandwidth of 10.5% for the reflection coefficient less than -10 dB, the axial ratio (AR) bandwidth of 2.06% for AR less than 3 dB, and the LHCP gain 5.2 dBi has been obtained.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128489901","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 : 2015-12-01DOI: 10.1109/APMC.2015.7411713
Chi‐Feng Chen, Bo-Hao Tseng, Sheng-Fa Chang
A compact, high-selectivity, and high-isolation microstrip electronically switchable diplexer is proposed. The diplexer is formed by connecting two switchable dual-band filters to a single feed with multiple coupling paths. No extra matching network is required for this design, which results in a smaller circuit size. In addition, the p-i-n diodes are loaded at one end of the assembled resonators to allow the proposed diplexer to be switchable. For the demonstration, a third-order bandpass switchable diplexer with four operating states is designed and fabricated using microstrip technology. Each channel band can be switched on and off independently. The diplexer has a compact size of 0.27 by 0.16 Excellent isolation between channels of better than 55 dB is also achieved.
{"title":"A compact and high isolation microstrip switchable diplexer","authors":"Chi‐Feng Chen, Bo-Hao Tseng, Sheng-Fa Chang","doi":"10.1109/APMC.2015.7411713","DOIUrl":"https://doi.org/10.1109/APMC.2015.7411713","url":null,"abstract":"A compact, high-selectivity, and high-isolation microstrip electronically switchable diplexer is proposed. The diplexer is formed by connecting two switchable dual-band filters to a single feed with multiple coupling paths. No extra matching network is required for this design, which results in a smaller circuit size. In addition, the p-i-n diodes are loaded at one end of the assembled resonators to allow the proposed diplexer to be switchable. For the demonstration, a third-order bandpass switchable diplexer with four operating states is designed and fabricated using microstrip technology. Each channel band can be switched on and off independently. The diplexer has a compact size of 0.27 by 0.16 Excellent isolation between channels of better than 55 dB is also achieved.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128498132","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413035
M. Yao, Dong Liu, Jie Hu, Jing Li, S. Shi
The receiver noise temperature of THz superconductor-insulator-superconductor (SIS) receivers is composed of several contributions, in which the input RF noise is usually not negligible. In this paper, we investigate the input RF noise (Trf) of a waveguide superconducting niobium nitride (NbN) SIS receiver operating at 0.5THz. In particular, the input RF noise is measured for two respective cases of a small beam aperture surrounded by an aluminum plate and a blackbody, which is located just in front of the 0.5THz NbN SIS receiver. Detailed measurement results will be presented.
{"title":"Study of the Input RF noise of a THz superconductor-insulator-superconductor receiver","authors":"M. Yao, Dong Liu, Jie Hu, Jing Li, S. Shi","doi":"10.1109/APMC.2015.7413035","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413035","url":null,"abstract":"The receiver noise temperature of THz superconductor-insulator-superconductor (SIS) receivers is composed of several contributions, in which the input RF noise is usually not negligible. In this paper, we investigate the input RF noise (Trf) of a waveguide superconducting niobium nitride (NbN) SIS receiver operating at 0.5THz. In particular, the input RF noise is measured for two respective cases of a small beam aperture surrounded by an aluminum plate and a blackbody, which is located just in front of the 0.5THz NbN SIS receiver. Detailed measurement results will be presented.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128588479","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413497
Xi Yu, Zhao-Xu Xu, Yi-Yao Hu, J. L. Li, Sheng Sun
An analytical approach for the synthesis of an asymmetric dual-band bandpass filter with a frequency-invariant arbitrary load is proposed. Based on numerical approximation technique and exchange-Remez algorithm, one can design a symmetric or asymmetric frequency response beside two passband. Different equiripple characteristic and orders can be achieved in each passband. Under the definition of power wave, the objective filter response with an arbitrary load can be converted to the measurable response and its referenced impedance is unity at the terminal. Finally, a synthesis example is presented and validated by the circuit theory.
{"title":"Synthesis of dual-band filters with an arbitrary load and asymmetric responses","authors":"Xi Yu, Zhao-Xu Xu, Yi-Yao Hu, J. L. Li, Sheng Sun","doi":"10.1109/APMC.2015.7413497","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413497","url":null,"abstract":"An analytical approach for the synthesis of an asymmetric dual-band bandpass filter with a frequency-invariant arbitrary load is proposed. Based on numerical approximation technique and exchange-Remez algorithm, one can design a symmetric or asymmetric frequency response beside two passband. Different equiripple characteristic and orders can be achieved in each passband. Under the definition of power wave, the objective filter response with an arbitrary load can be converted to the measurable response and its referenced impedance is unity at the terminal. Finally, a synthesis example is presented and validated by the circuit theory.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129064410","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 : 2015-12-01DOI: 10.1109/APMC.2015.7413052
Xiaoyi Wang, Yu Fu, Haowen Wang, Yunsong Gui, Guomin Yang
In this paper, a miniaturized planar antenna with enhanced bandwidth is designed for the ISM 433 MHz applications. The antenna is realized by cascading two resonant structures with meander lines, thus introducing two different radiating branches to realize two neighboring resonant frequencies. The techniques of shorting pin and novel ground plane are adopted for bandwidth enhancement. Combined with these structures, a novel antenna with a total size of 23 mm × 49.5 mm for the ISM band application is developed and fabricated. Measured results show that the proposed antenna has good performance with the -10 dB impedance bandwidth is about 12.5 MHz and the maximum gain is about -2.8 dBi.
本文设计了一种适用于ISM 433 MHz应用的小型化、增强带宽的平面天线。该天线通过两个弯曲线的级联谐振结构来实现，从而引入两个不同的辐射分支来实现两个相邻的谐振频率。采用了短引脚和新型接地面技术来提高带宽。结合这些结构，开发并制作了一种总尺寸为23 mm × 49.5 mm的新型天线，用于ISM波段应用。实测结果表明，该天线具有良好的性能，-10 dB阻抗带宽约12.5 MHz，最大增益约-2.8 dBi。
{"title":"A compact 433 MHz antenna with enhanced performance by using multi-resonant meander line structure","authors":"Xiaoyi Wang, Yu Fu, Haowen Wang, Yunsong Gui, Guomin Yang","doi":"10.1109/APMC.2015.7413052","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413052","url":null,"abstract":"In this paper, a miniaturized planar antenna with enhanced bandwidth is designed for the ISM 433 MHz applications. The antenna is realized by cascading two resonant structures with meander lines, thus introducing two different radiating branches to realize two neighboring resonant frequencies. The techniques of shorting pin and novel ground plane are adopted for bandwidth enhancement. Combined with these structures, a novel antenna with a total size of 23 mm × 49.5 mm for the ISM band application is developed and fabricated. Measured results show that the proposed antenna has good performance with the -10 dB impedance bandwidth is about 12.5 MHz and the maximum gain is about -2.8 dBi.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124627583","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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