volume | PIER Journals

Abstract

A novel substrate integrated waveguide (SIW) planar diplexer with very extremely high isolation is presented. It is formed by two quarter mode substrate integrated waveguide (QMSIW) cavity resonators which are designed individually and combined through a T-juction. The diplexer channels are 13% and 15% relative bandwidths at 2.35 GHz and 3.5 GHz, respectively. Inband return losses are better than 22 dB and 25 dB, and the insertion losses are 0.8 dB and 0.5 dB, in the lower and higher channels. The isolation between the two channels is lower than -42 dB, indicating enough isolation between the two channels. The measured results of the fabricated diplexer agree well with the simulated ones.

1. Chen, X., Z. Hao, W. Hong, T. Cui, and K. Wu, "Substrate integrated waveguide (SIW) asymmetric dual-mode filter and diplexer," Int. J. Electron., Vol. 92, No. 12, 743-753, 2005.
doi:10.1080/00207210500304494 Google Scholar

2. Hao, Z. C., W. Hong, J. X. Chen, X. P. Chen, and K. Wu, "Planner diplexer for microwave integrated circuits," IEE Proc. Microw. Antennas Propag., Vol. 152, No. 6, 455-459, 2005.
doi:10.1049/ip-map:20050014 Google Scholar

3. Kordiboroujeni, Z., J. Bornemann, and T. Sieverding, "K-band substrate integrated waveguide T-junction diplexer design by mode-matching techniques," Asia-Pacific Microwave Conf., 1297-1299, Nov. 2014. Google Scholar

4. Tang, H. J., W. Hong, J. X. Chen, G. Q. Luo, and K. Wu, "Development of millimeter-wave planar diplexer based on complementary characters of dual-mode substrate integrated waveguide filters with circular and elliptic cavities," IEEE Trans. Microw. Theory Tech., Vol. 55, No. 1, 776-782, Jan. 2007.
doi:10.1109/TMTT.2007.893655 Google Scholar

5. Kordiboroujeni, Z. and J. Bornemann, "Mode-matching analysis and design of substrate integrated waveguide T-junction diplexer and corner filter," Int. J. Number. Model, Vol. 28, No. 5, 497-507, 2015.
doi:10.1002/jnm.2030 Google Scholar

6. Kordiboroujeni, Z. and J. Bornemann, "Mode matching design of substrate integrated waveguide diplexer," IEEE MTT-S Int. Microwave Symp., 1-3, Seattle, WA, USA, Jun. 2013. Google Scholar

7. Jin, C. and Z. Shen, "Compact triple-mode filter based on quarter-mode substrate integrated waveguide," IEEE Trans. Microw. Theory Techn., Vol. 62, No. 1, 37-45, Jan. 2014.
doi:10.1109/TMTT.2013.2293128 Google Scholar

8. Guo, Z., K.-S. Chin, W. Che, and C.-C. Chang, "Cross-coupled bandpass filters using QMSIW cavities and S-shaped slot coupling structures," Journal of Electromagnetic Waves and Applications, Vol. 27, No. 2, 160-167, 2013.
doi:10.1080/09205071.2013.741514 Google Scholar

9. Wu, Y.-D., G. H. Li, W. Yang, and X. Yang, "Design of compact wideband QMSIW band-pass filter with improved stopband," Progress In Electromagnetics Research Letters, Vol. 65, 75-79, 2017.
doi:10.2528/PIERL16110301 Google Scholar

10. Sirci, S., J. D. Martinez Perez, J. J. Vague Cardona, and B. Esbert, "Substrate integrated waveguide diplexer based on circular triplet combline filters," IEEE Microw. Wireless Compon. Lett., Vol. 25, No. 7, 430-432, Jul. 2015.
doi:10.1109/LMWC.2015.2427516 Google Scholar

11. Dong, Y. and T. Itoh, "Substrate integrated waveguide loaded by complementary split-ring resonators for miniaturized diplexer design," IEEE Microw. Wireless Compon. Lett., Vol. 21, No. 1, 10-12, Jan. 2011.
doi:10.1109/LMWC.2010.2091263 Google Scholar

12. Garcia-Lamperez, A., M. Salazar-Palma, and S.-H. Yeung, "SIW compact diplexer," IEEE MTT-S Int. Dig., 1-4, Jun. 2014. Google Scholar

13. Cheng, F., X. Lin, K. Song, Y. Jiang, and Y. Fan, "Compact diplexer with high isolation using the dual-mode substrate integrated waveguide resonator," IEEE Microw. Wireless Compon. Lett., Vol. 23, No. 9, 459-461, Sep. 2013.
doi:10.1109/LMWC.2013.2274036 Google Scholar

Dr. Wei Yang

Dr. Guo Hui Li

Dr. Yudan Wu

Dr. Ya-Na Yang

Dr. Li Sun

Prof. Xuexia Yang