Novel Substrate Integrated Waveguide Cavity Filter With Defected Ground Structure
Yu Lin Zhang, Wei Hong, KeWu, , Ji Xin Chen, Hong Jun Tang
IEEE Transactions on Microwave Theory and Techniques
Vol. 53, No. 4, April
1280 - 1287
Bandpass filter, cavity, coplanar waveguide (CPW), defected ground structure (DGS), eigenvalue problems, finite difference frequency domain (FDFD), open structure, substrate integrated waveguide (SIW)
An open-structure eigenvalue problem of substrate integrated waveguide (SIW) cavity structures is investigated in detail by using a finite-difference frequency-domain method, and the quality ( ) factor of such SIW cavities is given. Based on the concept of a defected ground structure, a new class of SIW cavity bandpass filters are designed, fabricated, and measured around 5.8 GHz. With their fabrication on standard printed circuit boards, such filters present the advantages of high- factor, high power capacity, and small size. Simulated and measured results are presented and discussed to show promising performances of the proposed filters.
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