A novel miniaturized bandpass half-mode substrate integrated waveguide (HMSIW) filter which uses dual-iris coupling method to load complementary split-ring resonators (CSRRs) into HMSIW is proposed in this paper. By modifying traditional CSRRs through nesting method combined with step impedance structure, a nested stepped-impedance complementary split-ring resonator (NSICSRR) structure with higher equivalent capacitance and inductance of CSRR is obtained. Based on the traditional single-iris coupling method, a dual-iris coupling method is developed. And NSICSRR is loaded into HMSIW by using the dual-iris coupling method, which can reduce the resonant frequency of the structure. In order to verify the effectiveness of the technology above in realizing the miniaturization of HMSIW filter, a second-order HMSIW filter is designed and measured. It can be found in the measured results that the filter has the center frequency of 6.35 GHz, the 3 dB bandwidth of 690 MHz, the return loss of better than 14 dB within the passband, and the size of 0.0396λg2. The experimental results are basically consistent with the simulation ones.
2. Liu, B., W. Hong, Y. Zhang, J. X. Chen, and K. Wu, "Half-mode substrate integrated waveguide (HMSIW) double-slot coupler," Electronics Letters, Vol. 43, No. 2, 113-114, 2007.
doi:10.1049/el:20073127
3. Huang, Y. M., Z. Shao, C. J. You, and G. Wang, "Size-reduced bandpass filters using quarter-mode substrate integrated waveguide loaded with different defected ground structure patterns," IEEE MTT-S International Microwave Symposium, 1-4, Phoenix, USA, 2015.
4. Choudhury, A. and S. Maity, "Design and fabrication of CSRR based tunable mechanically and electrically efficient band pass filter for K-band application," International Journal of Electronics and Communications, Vol. 72, 134-148, 2017.
doi:10.1016/j.aeue.2016.11.021
5. Huang, Y. M., Z. Shao, W. Jiang, T. Huang, and G. Wang, "Half-mode substrate integrated waveguide bandpass filter loaded with horizontal-asymmetrical stepped-impedance complementary split-ring resonators," Electronics Letters, Vol. 52, No. 12, 1034-1036, 2016.
doi:10.1049/el.2016.0372
6. Huang, Y. M., Y. Peng, Y. Zhou, H. Jin, S. Leng, and G. Wang, "Size-reduced dual-band HMSIW cavity filters loaded with double-sided SICSRRs," Electronics Letters, Vol. 53, No. 10, 689-691, 2017.
doi:10.1049/el.2016.4532
7. Xu, S., K. Ma, F. Meng, and K. S. Yeo, "Novel defected ground structure and two-side loading scheme for miniaturized dual-band SIW bandpass filter designs," IEEE Microwave and Wireless Components Letters, Vol. 25, No. 4, 217-219, 2015.
doi:10.1109/LMWC.2015.2400916
8. Danaeian, M., K. Afrooz, and A. Hakimi, "Miniaturization of substrate integrated waveguide filters using novel compact metamaterial unit-cells based on SIR technique," International Journal of Electronics and Communications, Vol. 84, 62-73, 2018.
doi:10.1016/j.aeue.2017.11.008
9. Azad, A. R. and A. Mohan, "Sixteenth-mode substrate integrated waveguide bandpass filter loaded with complementary split-ring resonator," Electronics Letters, Vol. 53, No. 8, 546-547, 2017.
doi:10.1049/el.2016.3620
10. Wang, C., Z. Wang, and Y. M. Huang, "Size-miniaturized half-mode substrate integrated waveguide bandpass filter incorporating E-shaped defected ground structure for wideband communication and radar applications," 20th International Conference on Advanced Communication Technology (ICACT) Technol., 12-16, Chuncheon-si, Korea (South), 2018.
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