{"title":"Channel modeling of reconfigurable antennas for undeground communications","authors":"H. Kunsei, K. Bialkowski, A. Abbosh","doi":"10.1109/AUSMS.2016.7593478","DOIUrl":"https://doi.org/10.1109/AUSMS.2016.7593478","url":null,"abstract":"The wireless communication channel in underground mines is often modelled as a waveguide, with multiple propagation zones and multipath interference. We show through simulation that a directional reconfigurable antenna defines a single propagation zone and improves the quality of a communication link by reducing multipath and increasing the gain in the direction of the receiver, making it ideal for an underground mine communication system. Our results show that depending on the beam-width produced by the antenna and the distance of the communication link, multipath interference can be mitigated or completely removed. For longer distance links (> 50 m), a beam-width of 20° is capable of mitigating multipath with satisfactory improvements in gain, extending coverage range and ultimately system's reliability.","PeriodicalId":103180,"journal":{"name":"2016 IEEE 2nd Australian Microwave Symposium (AMS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128858532","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":"Millimeter wave tunable power divider using modified Wilkinson design","authors":"Emad Al Abbas, A. Abbosh","doi":"10.1109/AUSMS.2016.7593465","DOIUrl":"https://doi.org/10.1109/AUSMS.2016.7593465","url":null,"abstract":"A variable power divider operating at the millimeter wave band using a modified Wilkinson structure is proposed. It is designed to operate at the millimeter wave band (28 GHz), which is proposed for 5G mobile systems. The power divider consists of conventional Wilkinson power divider but the two branches of the input T-junction are substituted by coupled-lines. Between each coupled - lines, there is a varactor to tune the coupling factor and thus the output power. Two open-ended stubs, connected to the output ports and a chip resister are used to enhance the output matching and the isolation, respectively. The proposed design has a compact size and range of simulated power division that varies from 1:1 to 1:2 through a frequency range from 27 to 29 GHz. The return loss and isolation between the outputs are more than 10 dB across the band and tuning range.","PeriodicalId":103180,"journal":{"name":"2016 IEEE 2nd Australian Microwave Symposium (AMS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116080326","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}