A Design of Microstrip Branch-Line Coupler with Bandstop Filter Based on SITLs Compensated Parallel Coupled Lines
Keywords:
Bandstop filter, Branch line suppression, Branch line couplerAbstract
This paper presented the improvement of Branch Line Coupler using the Bandstop Filter based on microstrip parallel coupled lines for the second harmonic suppression and the size minimization. To design the bandstop filter for the proposed coupler, equations were applied to determine variables for the proposed coupler. For validation of the performance of the proposed coupler, conventional coupler and the proposed coupler were fabricated and tested at the popular operating frequency of 0.9 GHz. From the measured results, it was shown that the proposed coupler exhibited the better performance. The second harmonic could be suppressed. It was less than -38.40 dB. Also, the return loss was less than -38.29 dB.
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2. Wang J, Wang B-Z, Guo Y-X, Ong L, Xiao S. A compact slow-wave microstrip branch-line coupler with high performance. IEEE Microwave and Wireless Components Letters. 2007; 17(7): 501-503.
3. Mondal P, Chakrabarty A. Design of miniaturised branch-line and rat-race hybrid couplers with harmonics suppression. IET microwaves, antennas & propagation. 2009; 3(1): 109-116.
4. Tsai K-Y, Yang H-S, Chen J-H, Chen Y-JE. A miniaturized 3 dB branch-line hybrid coupler with harmonics suppression. IEEE Microwave and Wireless Components Letters. 2011; 21(10): 537-539.
5. Kim J, Yook JG. A Miniaturized 3 dB 90 hybrid coupler using coupled-line section with spurious rejection. IEEE Microwave and Wireless Components Letters. 2014; 24(11): 766-768.
6. Kumar KVP, Karthikeyan S. Miniaturised quadrature hybrid coupler using modified t-shaped transmission line for wide-range harmonic suppression. IET Microwaves, Antennas & Propagation. 2016; 10(14): 1522-1527.
7. Zong B, Wang G, Zhang C, Wang Y. Miniaturised branch-line coupler with ultra-wide high suppression stopband. Electronics Letters. 2014; 50(19): 1365-1367.
8. Zhu L, Sun S, Li R. Microwave bandpass filters for wideband communications. John Wiley & Sons; 2011.
9. Kumpang S, Phromloungsri R, Chongcheawchamnan M, Krairiksh M, Robertson D. Design and application of microstrip parallelcoupled lines employing step-impedance transmission-line compensation. IET microwaves, antennas & propagation. 2009; 3(3): 410-415.
