{"title":"Developing terahertz filters using the deep reactive ion etching (DRIE) process","authors":"Z. Hao, W. Hong","doi":"10.1109/IMWS-AMP.2016.7588426","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588426","url":null,"abstract":"This paper introduces some recent developments of terahertz bandpass filters. By adopting dual-resonating-mode cavities, transmission zeroes are obtained in the design, which greatly improve the selectivity of the terahertz bandpass filters. As demonstrations, terahertz bandpass filters having a center frequency of 400 GHz have been fabricated by using the deep reactive ion etching (DRIE) process. Experiments have been carried out to verify the design. High selectivity was obtained in the experiment, and the measured prototypes have fractional bandwidths of 7.52% and 5.88%, respectively. Measurement results show that the loss of the fabricated straight waveguide is about 0.144 dB/mm at 400 GHz, and the prototypes have insertion losses of 2.84 dB and 4.3 dB, respectively, which includes the additional loss from a 4.5 mm long waveguide.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125396818","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}
T. Matsui, Yuto Inose, H. Mori, T. Kinoshita, Mingkai Liu, D. Powell, I. Shadrivov
{"title":"Reconfigurable THz and microwave metamaterials based on π-conjugated polymers","authors":"T. Matsui, Yuto Inose, H. Mori, T. Kinoshita, Mingkai Liu, D. Powell, I. Shadrivov","doi":"10.1109/IMWS-AMP.2016.7588374","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588374","url":null,"abstract":"We demonstrate various types of reconfigurable metamaterials utilizing π-conjugated polymer in terahertz (THz) and microwave frequency ranges. Linear actuators made from heavily doped polypyrrole film are utilized to change the relative lateral position of two THz metasurfaces with a control voltage, and accordion-shaped origami actuators are used to change the distance between two microwave split-ring resonators (SRRs). In both cases this results in significant tunability of the metamaterial resonances with a change of bias voltage. SRR meta-atom made of rolled heavily doped polypyrrole film show tunable resonant characteristics under monochromatic continuous wave (CW) microwave pumping.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121570905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A wideband dual-polarized dipole linear array with resistive loading","authors":"Li Zhou, Shiwen Yang, Zhiwei Guo, Yikai Chen","doi":"10.1109/IMWS-AMP.2016.7588405","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588405","url":null,"abstract":"A dual-polarized, tightly-coupled dipole linear array, delivering 5.7:1 bandwidth, is presented. Most of previous work on tightly-coupled array is focused on two-dimensional array. This communication presents a dual-polarized, tightly-coupled dipole linear array, which has much more potential in application. The linear array incorporates a resistive loop as the substrate load to broaden the bandwidth of both polarization. For vertical polarized dipole of linear array, lacking tightly-coupled environment, there are sever methods implemented to broaden the bandwidth, such as gradient slot and folded arms. Simulated results show that the linear array can achieve 5.7:1 bandwidth while scan to ±50°, for VSWR<;3(sever frequency <;3.5), and the radiation efficiency maintain above 50%.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129203924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design and performance of a novel miniaturized LTCC Wilkinson power divider","authors":"Xin Wang, Dongchun Qiao, Yong-sheng Dai","doi":"10.1109/IMWS-AMP.2016.7588326","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588326","url":null,"abstract":"This paper presents the design and fabrication of a novel miniaturized low temperature co-fired ceramic (LTCC) Wilkinson power divider. By using the even-odd mode impedance theory, the analysis of this Wilkinson power divider is transformed to solve problems of impedance matching. LC impedance transformer is used to replace conventional transmission line to reduce the volume of the power divider. Build and optimize the schematic diagram through Agilent advanced design system (ADS) and then use Agilent high frequency structure simulator (HFSS) to build the 3D model. Finally, LTCC technology is used to manufacture the power divider. The test curves of the samples match well with the simulated curves. The insertion loss is less than 0.4dB from 3.1 GHz to 3.5 GHz, the return loss is better than 18dB and the isolation is better than 20dB. The size of the power divider is only 3.2mm × 1.6mm × 0.9mm.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116786686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A filtering antenna with 3rd-order Chebyshev response","authors":"Xi He, Jun Xu","doi":"10.1109/IMWS-AMP.2016.7588389","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588389","url":null,"abstract":"Unlike conventional filters and antennas that are separated, a filtering antenna with 3rd-order Chebyshev response is presented in this paper. At first, a 3rd-order Chebyshev bandpass filter is designed by utilizing coupling matrix. Then, an aperture is etched on the narrow wall of the last resonator of the filter for energy radiation. As demonstration, an example of the filtering antenna with center frequency of 9 GHz and bandwidth of 500 MHz is presented. Simulated results agree well with theoretical results. Compared with conventional filters and antennas, the volume of filtering antennas can be reduced to some extent.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115970880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Electromagnetic scattering characteristics of composite random rough surface of adjacent region between ground and ocean on terahertz waveband","authors":"G. Zou, C. Tong, Tong Wang, H. Sun","doi":"10.1109/IMWS-AMP.2016.7588446","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588446","url":null,"abstract":"A composite random rough surface model is presented for describing adjacent region between ground and ocean. Monte Carlo method is used to build composite random rough surface, gauss spectral function is used to simulate ground region, and Pierson Moskowitz (PM) spectral function is used to simulate ocean region. Weighted inverse tangent function is presented to smooth adjacent region. The electromagnetic coupling between facet in respective region and facet in adjacent region is considered, an iterative physical optics (IPO) based on the Stratton-Chu integral equations is presented. The curves of bistatic scattering coefficient (BSC) of ground and ocean rough surface on MHz, GHz, and THz waveband are obtained. Electromagnetic scattering characteristics of ground, ocean, and composite random rough surface on THz waveband are compared. The influences of root mean square (RMS) of ground region and wind velocity of ocean region on BSC of horizontal-to-horizontal (HH) polarization on THz waveband are discussed. The numerical results show that influences of these parameters on BSC of composite random rough surface on THz waveband are very complex.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115130792","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}
Yang Cai, Yingsong Zhang, Liu Yang, Nan Jing, Z. Qian
{"title":"Improvement of SIW horn antenna with metallic via drilled transition","authors":"Yang Cai, Yingsong Zhang, Liu Yang, Nan Jing, Z. Qian","doi":"10.1109/IMWS-AMP.2016.7588386","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588386","url":null,"abstract":"In this paper, a wideband substrate integrated waveguide (SIW) horn antenna with enhanced performance is investigated. Through adding metallic via on the edge of the parallel plates, additional inductance is introduced and can compensate the coupling capacitance in some degree, which significantly improves the impedance matching of the planar horn antenna. Moreover, the introduced via act as the extended narrow walls of SIW, which can enhance the Front-to-Back Ratio (FTBR) at the same time. Results indicate the proposed horn antenna works from 16.42 to 20.89 GHz with stable end-fire radiation patterns in the whole operating band.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"334 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129471101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A study on plasma diagnostics by quasi-optical resonator method","authors":"Hu Zheng, T. Liu, E. Li","doi":"10.1109/IMWS-AMP.2016.7588355","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588355","url":null,"abstract":"A quasi-optical resonator system for plasma's non-intrusive diagnosis is presented. The test system includes xenon-lamp, quasi-optical resonant cavity, vector network analyzer and mobile platform. Before and after adding plasma to the resonant cavity, the change of resonance frequency and quality factor can be detected by vector network analyzer. According to the perturbation theory, plasma's parameters could be given by calculation. By changing xenon-lamp's position in the quasi-optical cavity, a wider range of concentration can be calculated in different electric field strength. Reliability of the quasi-optical system for plasma diagnostics is verified through analyzing the results.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129561993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A dual circularly polarized planar Luneberg lens antenna for mm-wave wireless communication","authors":"Zhipeng Shi, Shiwen Yang, Li Zhou, Yikai Chen","doi":"10.1109/IMWS-AMP.2016.7588404","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588404","url":null,"abstract":"A dual circularly polarized (CP) planar Luneberg lens antenna for mm-wave wireless communication is presented. Fed by a dual linearly polarized patch antenna, this planar lunneberg lens antenna is based on dielectric slab waveguide (DSW). The circularly polarized radiation is achieved by exciting TM0 and TE0 modes with 90° phase difference in DSW. The desired refractive index of luneberg lens antenna is obtained by shaping the surface of dielectric slab. The dual-CP planner lens antenna is based on polystyrene (εr=2.54, tan δ=0.0005). The optimized dual-CP planar luneberg lens antenna, 19.4λ diameter and 0.5λ total height, achieves 18.7 dBi simulated gain, 4.2° and 60.2° half-power beamwidth for the horizontal plane and the vertical plane at 30 GHz. The Simulated results present the axial ration below 3 dB at the main beam direction is from 29.6GHz to 30.45GHz, showing good antenna performance.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126269305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Substrate integrated antenna conformal to 3D-printing cone","authors":"Z. A., Y. J. Cheng","doi":"10.1109/IMWS-AMP.2016.7588323","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2016.7588323","url":null,"abstract":"In this paper, a substrate integrated conformal antenna based on a 3D-printing conical pedestal is demonstrated. This array is mounted on a cone with a radius on the top of 15 mm and a radius on the bottom of 35 mm. It is synthesized at the center frequency of 35 GHz. It is not an easy task to fabricate a non-planar structure, thus the 3D printing technology is used to fabricate the cone. This method is much cheaper and simpler compared with the conventional machining. A waveguide feeding structure is employed to excite the substrate integrated waveguide (SIW) conformal antenna and fabricated through the 3D printing technology as well. In simulation, it has a -21dB side-lobe level (SLL) in H-plane at 35 GHz. At last, experimental results of an antenna prototype has been reported, demonstrating that due to the process and measurement error the SLL is -16dB.","PeriodicalId":132755,"journal":{"name":"2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125825768","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}