A novel miniaturized multilayer substrate integrated waveguide (SIW) filter is designed. The filter is constructed with four compact SIW resonator cavities, and each cavity supports TE101 mode, which can be controlled by the slot located between layers. The area of the compact SIW resonator is just 1/16 of that of original substrate integrate waveguide (SIW) resonator. Meanwhile, the area of the four-order filter is 13.2 mm×26.4 mm. The insertion loss and return loss of the fabricated filter are -1.8 dB and -14.6 dB, respectively. Meanwhile, the tunable filter realizes center frequency linearity, which works at 1.6 GHz with an adjustable range of 51.8%. The insertion loss is -1.2 dB, and the return loss is less than -15 dB. The coplanar cavity coupling structure achieves a switchable bandwidth.
"Design of Novel Miniaturized Multilayer Substrate Integrated Waveguide Filter and Tunable Filter," Progress In Electromagnetics Research M,
Vol. 77, 195-204, 2019. doi:10.2528/PIERM18112502
1. Wu, L.-S., X.-L. Zhou, W.-Y. Yin, C.-T. Liu, L. Zhou, J.-F. Mao, and H.-L. Peng, "A new type of periodically loaded half-mode substrate integrated waveguide and its applications," IEEE Trans. Microwave Theory Tech., Vol. 58, No. 4, 882-893, 2010. doi:10.1109/TMTT.2010.2042832
2. Kai, K. Z., et al. "A novel miniaturization double folded quarter mode substrate integrate waveguide tunable filter design in LTCC," IEEE Conference ICMMT, 1-4, 2018.
4. Wei, Q. F., Z. F. Li, L. S. Wu, et al. "A novel multilayered cross-coupled Substrate-Integrated Waveguide (SIW) circular cavity filter in LTCC," Microwave & Optical Technology Letters, Vol. 51, No. 7, 1686-1689, 2010. doi:10.1002/mop.24435
5. Shen, M., Z. Shao, X. Du, et al. "Ka-band multilayered substrate integrated waveguide narrowband filter for system-in-package applications," Microwave & Optical Technology Letters, Vol. 58, No. 6, 1395-1398, 2016. doi:10.1002/mop.29833
6. Xu, Z. Q., Q., P. Wang, K. W. Qian, et al. "Substrate Integrated Waveguide filter with embedded mixed source-load coupling," Electronics Letters, Vol. 49, No. 23, 1464-1465, 2013. doi:10.1049/el.2013.2572
7. Parment, F., A. Ghiotto, T. P. Vuong, et al. "Ka-band compact and high-performance bandpass filter based on multilayer air-filled SIW," Electronics Letters, Vol. 53, No. 7, 486-488, 2017. doi:10.1049/el.2016.4399
8. Wang, D., K. S. Chin, W. Che, et al. "Compact 60GHz low-temperature cofired ceramic filter with quasi-elliptic bandpass response," IET Microwaves Antennas & Propagation, Vol. 10, No. 6, 664-669, 2016. doi:10.1049/iet-map.2015.0694
9. Cameron, R. J., C. M. Kudsia, and R. R. Mansour, Microwave Filters for Communication Systems: Fundamentals, Design, and Applications, Wiley, New York, 2007.