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

{"title":"Analysis of a Terahertz Photoconductive Antenna Using the Subgrid FDTD Method","authors":"J. Shibayama, Yuta Nakano, J. Yamauchi, H. Nakano","doi":"10.1109/APWC52648.2021.9539741","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539741","url":null,"abstract":"A terahertz photoconductive antenna is analyzed using the finite-difference time-domain (FDTD) method. To reduce the computational requirement, the subgrid technique is introduced into the FDTD calculation. The memory requirement and the computational time are shown to be reduced by about 70% and 60%, respectively, in comparison with the conventional FDTD method, maintaining numerical accuracy.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"65 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":"114198819","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":"RF Co-Designed Non-Reciprocal Bandpass Filters","authors":"D. Psychogiou, Andrea Ashley","doi":"10.1109/APWC52648.2021.9539570","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539570","url":null,"abstract":"RF front-end antenna interfaces with the ability to simultaneously transmit and receive (STAR) at the same frequency and at the same time are highly desirable in a plethora of wireless communication and electronic warfare (EW) systems. Whereas full-duplex radios enhance spectral efficiency by doubling the channel throughput, EW applications benefit from the ability to listen while jamming. The effectiveness of STAR systems is highly-dependent on the levels of isolation (> 80 dB is typically required) that can be achieved between the transmit and the receive module of the antenna interface. Monostatic and bi-static STAR antennas [1] followed by multi-stage circulator/isolator networks and self-interference cancellers may potentially meet the desired 80-140 dB levels of isolation, however their size is prohibitively large for small/medium-size base stations. Alternative miniaturization techniques such as self-biased materials [2] or transistor-based implementations [3] are nowadays being explored for these systems. However, all of these approaches are at their infancy and suffer from poor isolation (~20-30 dB) and high in-band loss (> 5 dB). Taking into consideration the aforementioned limitations, this paper provides an overview of our research on RF front-end modules with collocated RF signal processing actions with the purpose of miniaturizing the overall size, loss and power consumption of an RF front-end. In particular, we address different techniques that are used for size compactness and loss reduction through the realization of isolators/circulators with embedded bandpass filter (BPF) capabilities, as shown in Fig. 1 . The main approaches that will be presented include: i) ferrite-based co-designed BPF and circulators [4] , ii) transistor-based nonreciprocal BPF and isolators [5] , and iii) fully-integrated non-reciprocal BPFs and isolators/circulators [6] . A discussion of the trade-offs for each implementation (i.e., size, complexity, performance, scalability, etc.) along with experimental validation of the proposed topologies will be presented at the conference.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"207 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":"116111305","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":"Localization in Distributed Wireless Systems Based on High-Accuracy Microwave Ranging","authors":"Serge R. Mghabghab, J. Nanzer","doi":"10.1109/APWC52648.2021.9539760","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539760","url":null,"abstract":"We present a high-accuracy localization approach for estimating the positions of elements in a distributed phased array to support distributed beamforming. The approach is based on a spectrally-sparse, high-accuracy microwave ranging method and time of arrival (TOA) estimation between three receiving antennas. The ranging approach leverages a spectrally-sparse waveform that achieves near-optimal range accuracies on the order of 5 mm with a 9 MHz waveform bandwidth implemented at C-band. We implement the approach in software-defined radios, and demonstrate localization accuracy below 5 cm with a receiving array area more than an order of magnitude smaller than other approaches.","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":"124905417","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":"Many-Antenna Full-Duplex with Fully Digital and Hybrid Beamforming Radios","authors":"Gavin Megson, Ehsan Aryafar","doi":"10.1109/APWC52648.2021.9539682","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539682","url":null,"abstract":"Next generation wireless systems are expected to use a very large number of antennas at base stations (BSs). For example, the 3GPP has already included support for up to 128 antenna BSs for sub-6 GHz cellular systems in its standard specifications. The traditional approach to build many-antenna BSs is to connect each antenna element to a separate Tx-Rx RF chain (an architecture referred to as folly digital) . However, it is possible to reduce the cost and power consumption of the BS by connecting each RF chain to an array of antennas by using phased arrays or switched beam antennas (an architecture referred to as hybrid beamforming) .","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"22 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":"133759942","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 Framework for Design of Multibeam Antenna Systems used for Amplitude-Only Direction Finding Based on Correlation Method","authors":"Theodore J. Prince, M. Elmansouri, D. Filipović","doi":"10.1109/APWC52648.2021.9539529","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539529","url":null,"abstract":"Contemporary radio frequency systems require accurate angle of arrival (AoA) estimates on incoming signals. There are many approaches to achieve AoA estimations including amplitude-only and phase interferometry, just to name two traditional methods. Whereas the latter are more accurate, the former are simpler and less expensive. Due to their lower costs and ability to cover extreme bandwidths, there has been increased interest in amplitude-only AoA receivers. The two main techniques utilized in these systems are amplitude comparison [1] and the correlation method [2] . Correlation method may enable operation over a wider field of view (FoV) with a well-designed multibeam antenna system and considering the processing times can be made fast, it is the preferred implementation in many cases [2] . However, the guidelines for the design of multibeam antennas for the use with these systems are not widely discussed in the open literature. In this work, we study the impact of multibeam antenna characteristics and system parameters on the accuracy of the correlation method. Moreover, important design guidelines for practical implementation are also provided.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"517 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":"116230970","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":"MACKEY II fed inside AMC substrate","authors":"S. Makino, Keisuke Miyashita, Toshiki Tamura, K. Itoh","doi":"10.1109/APWC52648.2021.9539845","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539845","url":null,"abstract":"The Meta-surface inspired Antenna Chip developed by KIT EOE Laboratory (MACKEY, Wi-Fi 2.4GHz band), is an electrically small antenna that is sufficiently robust to metal objects. However, there has been a demand to make the basic type even thinner because it is 4mm thick. Therefore, a new model, named MACKEY II (Wi-Fi 2.4 GHz band), with broadband characteristics and reduced thickness is proposed. It is adapted to create a new structure, where the antenna substrate is placed inside the AMC substrate to create a thinner dimension than the basic type. In this paper, the characteristics and feeding method of MACKEY II are presented, along with, the measurement results.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"29 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":"124517135","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 and Small Diameter Halo Antenna with Four Parasitic Elements","authors":"T. Mizutani, Y. Wada, N. Michishita, H. Morishita","doi":"10.1109/APWC52648.2021.9539725","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539725","url":null,"abstract":"In recently, many vertically polarized antennas are mainly used for various mobile communications to save installation space. Therefore, a horizontally polarized antenna is desirable for polarization diversity to avoid interference. In addition, an omnidirectional radiation pattern is required to enable smooth transmission and reception even if the posture of the mobile changes. In this paper, we focus on the Halo antenna, which is a type of horizontally polarized antenna with an omnidirectional radiation pattern in the horizontal plane [1] . The Halo antenna is a folded dipole antenna that is bent into a cylindrical shape, and the input impedance of the Halo antenna can be adjusted by changing the gap width and the height of the antenna. However, the Halo antenna has a narrow band characteristic, and in order to reduce the lowest operating frequency of the Halo antenna while maintaining the relative bandwidth, it is necessary to increase the diameter of the antenna. Therefore, it has been reported by loading two parasitic elements in the vertical direction of the Halo antenna, the diameter of the antenna is not changed and the relative bandwidth is expanded [2] .","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"82 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":"125264838","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 circular HIS reflector with a symmetric fan-shape patch array applied to a spiral antenna","authors":"M. Tanabe","doi":"10.1109/apwc52648.2021.9539751","DOIUrl":"https://doi.org/10.1109/apwc52648.2021.9539751","url":null,"abstract":"This paper presents the antenna characteristics of a spiral antenna backed by a circular high-impedance surface reflector (CirHISR) composed of a fan-shaped patch element. The fan-shaped patch element is arrayed symmetrically. The antenna height between the spiral antenna and the bottom surface of the CirHISR is 0.09 wavelength (9.0 mm) at the lowest operating frequency of 3 GHz. Input impedance and axial ratio are analyzed using FEKO based on the method of moment and compared to that of a spiral antenna with a CirHISR asymmetric array using a fan-shaped patch element. It is found that good antenna characteristics are obtained across a frequency range of 3 GHz to 10 GHz (a fractional bandwidth of 108%). Similar antenna characteristics are also found between the spiral with the CirHISR symmetric patch array and that of the asymmetric one.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"14 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":"126066680","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 Novel Antenna Matching Technique for Joint Wireless Communication and Energy Harvesting","authors":"Sandy Saab, A. Mezghani, R. Heath","doi":"10.1109/apwc52648.2021.9539606","DOIUrl":"https://doi.org/10.1109/apwc52648.2021.9539606","url":null,"abstract":"Summary form only given. Merging the fields of digital communication, energy harvesting (EH), sensing, and RF system design is fundamental for achieving the best trade-off between the competing performance metrics. Matching the Low-Noise Amplifier (LNA) or the energy harvester input to the antenna source impedance is critical for maximizing the achievable rate or the power transfer efficiency. Therefore, this maximization needs to be optimized using joint performance metrics. In this paper, we introduce an optimized antenna matching technique for joint wireless communication and energy harvesting. The enhanced antenna matching process integrates the information theoretic capacity equation and Maxwell's equations. The resulting system substantially improves the trade-off between the harvested power and spectral efficiency based on our joint optimization approach. We design a 24 x 26 m2 compact wideband elliptical planar antenna using an FR4 substrate of 1.6mm thickness and a 4.4 dielectric constant. We optimize a lossless common matching network that matches the designed antenna to a LNA and an EH Schottky diode. The common matching network constitutes an ideal transformer in parallel with an inductor. The designed wideband antenna operates between 5.5-8 GHz.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"29 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":"129969433","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":"Measurement of Localizer Signal Interferences from Hangars in Airport","authors":"J. Honda, K. Matsunaga, A. Kezuka, H. Tajima","doi":"10.1109/APWC52648.2021.9539563","DOIUrl":"https://doi.org/10.1109/APWC52648.2021.9539563","url":null,"abstract":"This paper presents the measurement results of a localizer (LOC) experiment in Sendai Airport, a midsized airport in Japan. Multipaths caused by obstacles such as hangars cause interferences with LOC signals. Predicting these signal interferences is crucial from an airport safety perspective. Although many studies related to ILS signal interferences have been already reported so far and a few simulators have been released, Japan faces some uniquely difficult situations. Accordingly, we are now developing a numerical algorithm that handles the signal environment in Japan. We show the measurement results from a real airport, in which multipaths caused by buildings were detected. Our result reveals the behavior of LOC signals at airport and is useful for developing our new numerical algorithm.","PeriodicalId":253455,"journal":{"name":"2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":"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":"121976056","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}