volume | PIER Journals

Abstract

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 0.0396λ_g². The experimental results are basically consistent with the simulation ones.

1. Deslandes, D. and K. Wu, "Single-substrate integration technique of planar circuits and waveguide filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 51, No. 2, 593-596, 2003.
doi:10.1109/TMTT.2002.807820 Google Scholar

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 Google Scholar

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. Google Scholar

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 Google Scholar

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 Google Scholar

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 Google Scholar

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 Google Scholar

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 Google Scholar

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 Google Scholar

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. Google Scholar

Dr. Bo Yin

Mr. Zhangyao Lin

Dr. Honggang Hao

Dr. Wei Luo

Dr. Wen Huang