{"title":"Hybrid structure-based broadband field-rotation balun for millimeter-wave applications","authors":"J. Moghaddasi, K. Wu","doi":"10.1109/MWSYM.2015.7167048","DOIUrl":null,"url":null,"abstract":"A broadband balun structure is developed through a hybrid combination of substrate integrated waveguide (SIW) and antipodal fin-line topologies. The signal at the balanced port is divided between two unbalanced ports using a broadband SIW power divider which is capable of an equal power division with low phase and amplitude imbalance over a wide bandwidth. The 180° phase difference is made by the rotation of E-field polarization through the antipodal fin-line sections in two unbalanced branches. Due to the independency of this phase shifting with respect to propagation constant and wavelength, a constant 180° phase difference is achieved in a wide range of frequency. Using a printed circuit board (PCB) process, the proposed balun is prototyped and demonstrated for operation at millimeter-wave frequencies from 70 GHz to 90 GHz. The measurement results show an excellent performance with very low insertion loss of less than 1 dB and 180° phase difference between the unbalanced ports in a broad band of frequency.","PeriodicalId":6493,"journal":{"name":"2015 IEEE MTT-S International Microwave Symposium","volume":"81 1","pages":"1-3"},"PeriodicalIF":0.0000,"publicationDate":"2015-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2015 IEEE MTT-S International Microwave Symposium","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/MWSYM.2015.7167048","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
A broadband balun structure is developed through a hybrid combination of substrate integrated waveguide (SIW) and antipodal fin-line topologies. The signal at the balanced port is divided between two unbalanced ports using a broadband SIW power divider which is capable of an equal power division with low phase and amplitude imbalance over a wide bandwidth. The 180° phase difference is made by the rotation of E-field polarization through the antipodal fin-line sections in two unbalanced branches. Due to the independency of this phase shifting with respect to propagation constant and wavelength, a constant 180° phase difference is achieved in a wide range of frequency. Using a printed circuit board (PCB) process, the proposed balun is prototyped and demonstrated for operation at millimeter-wave frequencies from 70 GHz to 90 GHz. The measurement results show an excellent performance with very low insertion loss of less than 1 dB and 180° phase difference between the unbalanced ports in a broad band of frequency.