2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)最新文献

{"title":"Adaptive Self-interference Cancellation with a Lossless N-Tap Transversal Filter","authors":"Kamal Bhakta, L. Yeung, Yuanxun Ethan Wang","doi":"10.1109/APWC52648.2021.9539659","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539659","url":null,"abstract":"Simultaneous transmit and receive (STAR) architectures must continually improve receiver isolation techniques to support more demanding frequency agile and instantaneous RF bandwidth requirements. To ensure adequate lifetime and STAR performance, leakage signals above receive saturation levels must be suppressed to protect sensitive front end components. A commonly used technique to suppress leakage signals, known as selfinterference cancellation (SIC), can provide a sufficient level of analog isolation for full duplex operation. The adaptive self-interference canceller developed in this paper utilizes a novel transversal filter approach that passively replicates the strongly distorted transmitted signal, coupled at the receiver, for true time delay cancellation. Conventional transversal filter implementations introduce significant divider, combiner, and attenuator losses between each tap, severely limiting the synthesizable order of the multiple-path leakage channel, which effectively degrades the cancellation performance. To avoid these fixed losses, the novel transversal filter prototype incorporates a lineup of tunable coupler pairs transversely through delay lines as a theoretically lossless alternative to set amplitude and phase weighting coefficients at each tap. Minimizing transversal filter loss lessens the required coupling factor and improves insertion and power efficiency loss penalties at receive and transmit paths respectively. The loss improvements of the SIC architecture define the maximum interference power that can be cancelled. Therefore, to maximize the dynamic range of a STAR system, the SIC architecture should utilize a matching filter that balances loss, noise, and distortion. We propose a technique that provides a completely passive method to cancel strongly coupled signals up to 25 dBc below the transmitted power. The work outlines an avenue to substitute loss driven amplitude and phase weighting components with tunable reflective discontinuities, see equation (1) for a 2-tap filter expression, which can be extended to N-taps by cascading N-1 tunable coupler pairs. Analysis of the novel lossless transversal filter architecture has shown a cancellation performance of 30 dB across a125 MHz bandwidth centered at 2.4 GHz.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125019231","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":"Acceleration of Wideband Antenna’s Far-field Calculation of FDTD Method Utilizing 2D-ARMA Technique","authors":"T. Arima, Tominori Uno","doi":"10.1109/apwc52648.2021.9539624","DOIUrl":"https://doi.org/10.1109/apwc52648.2021.9539624","url":null,"abstract":"In this research, acceleration of calculation speed of FDTD analysis for far-field calculation is proposed. The proposed method utilizes 2-dimensional AutoRegressive-Moving-Average (ARMA) technique. The effectiveness of this method is confirmed by analyzing wideband antenna.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123146915","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 Circularly polarized Antenna with Oblique Radiation Angles for 5G Mobile Communication Devices","authors":"M. Matsunaga","doi":"10.1109/APWC52648.2021.9539715","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539715","url":null,"abstract":"A circularly polarized antenna radiating oblique into elevation angles is presented in this presentation. For the 5G networking system, direct communications between base stations and mobile communication devices are desired due to millimeter wave communications. It means that radiation directivities should be into the directions of base stations and polarization should be both of TE and TM, for 5G mobile communication devices.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"120 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124514217","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":"Synthesis and Realization of Multiband Bandpass Filters Based on Frequency Transformation for the Encoding of Chipless RFID Tags","authors":"M. Khaliel, J. Wen, A. Prokscha, Ahmed El-Awamry, Abdelfattah Fawky, T. Kaiser","doi":"10.1109/APWC52648.2021.9539618","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539618","url":null,"abstract":"This paper presents new design methodology of multiband bandpass filter based on coupled resonators and frequency transformation for the implementation of frequency coded retransmission based chipless RFID tags. By utilizing the frequency transformation, transmission zeros are introduced in the single band response, and thus multiple passbands are generated. Furthermore, the position and bandwidth of each band can be solely and arbitrarily controlled by controlling the location and number of transmission zeroes. The synthesizing algorithm is implemented in MATLAB to calculate the coupling matrix, external Q-factors and relating parameters. Afterwards, the methodology is verified with CST full wave simulations and measurements for the quad-band bandpass filter that is implemented with microstrip open-loop resonators. The simulation and measurement results of different codes are in good agreement, and thus prove the feasibility of the introduced approach for designing the encoding elements of frequency coded chipless RFID tags.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133620975","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":"Meteorological and Terrain Effects on RF Propagation","authors":"Lan Xu, Brandon R. Yee, Hubert Chew, Evangelos Petsalis","doi":"10.1109/APWC52648.2021.9539684","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539684","url":null,"abstract":"Both terrain profile and near-ground meteorological conditions can have significant effects on the propagation of Radio Frequency (RF) radiation, especially for near-ground propagation paths. High-resolution terrain data obtained from the United States Geological Survey (USGS), and range-dependent gradient of the lower atmospheric refractive index calculated from near real-time weather data from the National Oceanic and Atmospheric Administration (NOAA) were used as inputs to the Aerospace Radio Frequency Propagation Tool (APRT) propagation model. Field measurements show that the model using the near real-time weather data generates more accurate propagation loss predictions than the model using constant weather data.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"181 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131277344","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":"The Expanding Effect of Scanning Angle for Small-Aperture Phased Array Antenna by Huygens' Metasurface-Based Radome","authors":"Xumin Ding, Yue Wang, Kuang Zhang, J. Fu, Cong Wang, Qun Wu","doi":"10.1109/APWC52648.2021.9539645","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539645","url":null,"abstract":"A new application of the radome is to enhance the scanning range of the antenna, which can be realized by surrounding the antenna with a voltage-controlled active frequency selective surface (AFSS) [1] or loading a high- transmittance active metasurface [2] . For passive application, the thickness or the equivalent dielectric constant of the hemispherical radome needs to be changed at different positions to achieve a wide range of refraction angle of the incident beam [3] . Huygens' metasurface (HMS), which consists of electric and magnetic dipoles, is a novel kind of metasurface with a high transmission efficiency. By combining the orthogonal electric dipole and the magnetic dipole in each Huygens’ meta-atom, HMS meta-atoms can provide the full 2π range of phase change with arbitrary transmission amplitude for line polarization wave. In microwave region, metal strips and metal rings printed on the dielectric substrate are the simplest structures adopted to construct the required electric and magnetic dipoles, which makes the Huygens' metasurface-based radome a potential application for beam steering. Here, a novel method to enhance the scanning angle of phased array antenna utilizing passive gradient phase metasurface is proposed to achieve planarization and thickness reduction.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"343 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122546050","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 of a Linearly Dual-Polarized Dual-Band and Wideband Multi-Ring Microstrip Antenna with a Via Fed by Two L-Probes","authors":"Y. Kimura, S. Saito, Y. Kimura, M. Tatematsu","doi":"10.1109/APWC52648.2021.9539688","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539688","url":null,"abstract":"Wideband and multi-band antennas are strongly attracted for various wireless applications recently. Microstrip antennas (MSAs) are widely used for such as mobile communication, broadcasting, and radar applications because of small size, low profile, light weight, and low fabrication cost. The authors have developed multi-ring microstrip antennas (MR-MSAs) as a multiband planar antenna [1] . The MR-MSA consists of multiple ring patches arranged concentrically on the upper layer and an L-shaped feeding probe (L-probe) on the lower layer of a thin double-layered dielectric substrate. The MR-MSA exhibits excellent multiband performance because operating frequencies of the MR-MSA can be designed flexibly with stable radiation patterns. Another feature of the MR- MSA is that linear or circular polarization of each operating frequency can be designed individually. Only disadvantage of the MR-MSA is that the bandwidth of each operating frequency is narrow. On the other hand, the MR-MSA fed by an L-probe with a thick dielectric substrate for dual-band and wideband operation has been developed where a triple-layered thick dielectric substrate with a thickness of approximately 0.11 wavelengths at the center frequency of the lower band and with a relative dielectric constant of 2.6 is used [2] . Approximately 20% and 15% fractional bandwidths of less than -10 dB reflection are obtained for the lower and upper bands, respectively. Furthermore, a linearly dual-polarized MR-MSA for dual-band and wideband operation has been proposed by placing two L-probes at the orthogonal positions of the ring patches [3] . The port-to-port isolation for the dual-polarizations is more than 13 dB over the lower and upper bands where the fractional bandwidths of less than -10 dB reflection are 21.7% and 10.6%, respectively.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125126583","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":"Linear-Polarized and Dual-Polarized Electric-field Sensor using LiNbO3 Phase Modulator for 28 GHz Band","authors":"S. Kurokawa, M. Ameya, S. Matsukawa, Masahiro Sato, M. Onizawa, H. Murata, M. Hirose","doi":"10.1109/APWC52648.2021.9539559","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539559","url":null,"abstract":"We have developed an antenna-coupled-electrode electric-field sensor for 28 GHz-band in 5th generation mobile communication as a receiving antenna [1] . In this paper, we report a 3D near field receiving pattern for the simultaneously-receiving dual-polarized type electric-field sensor and a linear-polarized type electric-field sensor that have 2 and 2by 2 array antennas respectively. The electric-field sensor is fabricated on a z-cut LiNbO3 film of about 50 μm thickness that is stacked on a base substrate of SiO 2 glass about 250 μm thickness. Two square patch antennas as a receiving antenna are connected to a standing-wave resonant electrode by using microstrip feeding lines to form an antenna-coupled electrode on the electric-field sensor. An optical waveguide as a phase modulator is fabricated on the reverse side of the LiNbO3 film. Figure 1 schematically shows a linear-polarized type electric-field sensor, and a dual-polarize type electric-field sensor. For evaluating the receiving pattern for the electric-field sensor, we carried out the near field E θ and E ϕ receiving-pattern measurements using a WR-28 standard horn antenna as a transmitting antenna. Figure 2 shows a 3D (spherical coordinate) receiving-pattern measurement setup using an arm vertical articulated robot and optical fiber link system as a microwave transmitting system. In the case of a dual-polarized electric field sensor, we can simultaneously measure orthogonally polarized electric fields using a 2-port vector network analyzer with an option. Figure 3 show measured receiving patterns for the linear-polarized type electric-field sensor at 28.1 GHz. Figure 4 shows measured receiving pattern for the dual-polarized type electric-field sensor at 28.1 GHz. These results show the fact that the-dual polarize electric field sensors can measure electric fields simultaneously. However, the peak zenith angle for the dual-polarize electric field sensor is about 15 degrees tilted. We are developing the simultaneously-measured orthogonally-polarized electric field sensor with the peak zenith angle at 0 degree.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117231016","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 of Decoupling Method Using Parasitic Elements for Two Planar Inverted-F Antennas","authors":"Quang Quan Phung, Taiyo Kai, N. Michishita, Hiroshi Sato, Y. Koyanagi, H. Morishita","doi":"10.1109/APWC52648.2021.9539851","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539851","url":null,"abstract":"In recent years, multiple-input multiple-output (MIMO) applications are known as a potential technique for enhancing the system performances with large capacity and high-speed transmission, and play a major role in developing the next generation communication [1] . This technique is applied for not only base station but also mobile handset terminal. For mobile handset terminal, because of the limited space for antennas installing, it is necessary to space the MIMO antennas closely on the same ground plane. However, the strong mutual coupling occurs between them and adversely affect the total antenna efficiency. For this reason, reduction of mutual coupling between MIMO antennas is required. So many decoupling solutions have been proposed using various arrays of conventional antenna element. Among them, we focus on the simplicity of the decoupling method using bridge line (BL) to connect directly antennas [2] . When antenna elements are connected directly by a BL, strong mutual coupling can be reduced, but the resonant frequency shifts to a different frequency. Hence, to shift the resonant frequency toward the desired frequency, the original size of the antenna elements must be adjusted. This is disadvantageous if the method is applied in cases where the design conditions render it difficult to connect the antennas directly or adjust the original antenna size. Therefore, to easily reduce mutual coupling in such a case, a decoupling method that does not require both connecting antennas directly and adjusting the original antenna size is necessitated. In this study, we propose a novel decoupling method using parasitic elements (PEs) connected by the BL.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126201027","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":"QCTO Luneburg Lens-Based Retroreflective Tag Landmarks for mm-Wave Self-Localization Systems","authors":"P. Kadera, Jesús Sánchez-Pastor, A. Jiménez-Sáez, M. Schüßler, J. Lacik, R. Jakoby","doi":"10.1109/APWC52648.2021.9539571","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539571","url":null,"abstract":"This paper presents a novel passive frequency-coded retroreflective tag landmark (radar target) based on a flattened quasi-conformal transformation optics Luneburg lens enabling an extreme field-of-view angle. A three-dimensional photonic crystal structure with embedded high-Q resonators is exploited as a coding retroreflective surface at the bottom of the lens. The retroreflector’s performance is investigated at a frequency of 80 GHz (W-band) enabling a precise mm-Wave indoor localization.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122311856","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}