Outline
- Abstract
- 1. Introduction
- 2. Theory and Analysis
- 3. Simulation and Measurement
- 4. Conclusion
- Competing Interests
- Acknowledgments
- References
رئوس مطالب
- 1. معرفی
- 2. تئوری و تحلیل
- 3. شبیه سازی و اندازه گیری
- 4. نتیجه گیری
Abstract
In this paper, a substrate integrated waveguide (SIW) bandpass filter using defected ground structure (DGS) with complementary split ring resonators (CSRRs) is proposed. By using the unique resonant properties of CSRRs and DGSs, two passbands with a transmission zero in the middle have been achieved. The resonant modes of the two passbands are different and the bandwidth of the second passband is much wider than that of the first one. In order to increase out-of-band rejection, a pair of dumbbell DGSs has been added on each side of the CSRRs. The structure is analyzed using equivalent circuit models and simulated based on EM simulation software. For validation, the proposed filter is fabricated and measured. The measurement results are in good agreement with the simulated ones.
Conclusions
In this paper, a novel SIW bandpass filter using CSRRs with DGSs has been presented and analyzed. Three different structures are combined together to implement the proposed filter. Two passbands are created by evanescent mode and TE101 mode. The rejection level between the passbands is improved due to the transmission zero generated by DGSs. The measured results are in good agreement with the simulation results, and, by comparing with other similar filters, the proposed filter has the advantages of much compact size, lower insertion loss, and wider 3 dB fraction bandwidth, which makes it feasible and applicable in modern microwave communication circuits.