Dual-Band Coupled-Line Couplers With Wide Separation Between Bands

作者：Chang Chih Chun; Chin Kuo Sheng^*; Chiang Yi Chyun

来源：IEEE Transactions on Microwave Theory and Techniques, 2017, 65(8): 2918-2929.

DOI：10.1109/TMTT.2017.2693153

• Cascaded coupled lines
• coupled-line coupler
• dual band
• forward wave
• high band ratio
• strong coupling

In this paper, we developed three designs of dualband coupled-line couplers with wide separation between bands. Coupler A was constructed using three cascaded coupled-line sections with a band ratio f(H)/f(L) of up to 7. Coupler B, with a stub-tapped coupled line, was developed for compactness and has advantages of high band ratio and controllable bandwidth. Couplers A and B are most suited for weak coupling applications. Coupler C was developed for achieving strong coupling while maintaining a high band ratio, and it was constructed using a coupled-line section connected by two uncoupled lines at its two ends. Coupler C has advantages of high band ratio, strong forward-wave coupling, compact size, and easy fabrication. Coupler A, operating at 0.84 and 5.17 GHz with f(H)/f(L) = 6.15 and a coupling of -10 dB, and Couplers B and C, operating at 0.7 and 2.6 GHz with f(H)/f(L) = 3.71 and couplings of -11 and -3 dB, respectively, were fabricated for demonstration. The measured results validate their superior dual-band performance.

• 出版日期2017-8
• 单位长春大学