Miniaturized Planar 90° Hybrid Coupler with Unchanged Bandwidth Using Single Characteristic Impedance Line
A planar branch-line coupler which is entirelycomposed of transmission line of single characteristicimpedance equal to the system reference impedance ispresented.The low impedance series arms of the conventionalcoupler are replaced by their equivalent structures with 50Ωlines.A transmission-line model is derived to obtain the designcurves.The main advantage of the present design is that thebandwidth of the coupler remains unchanged.In addition,thearea of present coupler is only 50％ and also the secondharmonic is suppressed by at least 45 dB as compared to theconventional design.Full-wave EM simulation is used toconfirm the design approach for the prototype coupleroperating at 1.2 GHz.
Branch-line coupler miniaturization harmonicsuppression bandwidth.
Vamsi Krishna Velidim Amitabha Bhattacharya
Indian Institute of Technology Kharagpur,Kharagpur 721302,West Bengal,India
国际会议
2008 China-Japan Joint Microwave Conference(2008年中日微波会议)
上海
英文
396-399
2008-09-10（万方平台首次上网日期，不代表论文的发表时间）