期刊
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
卷 26, 期 9, 页码 678-680出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWC.2016.2597222
关键词
Harmonic suppression; higher-order modes; mixed coupling; multilayer; SIW filter
资金
- National Natural Science Foundation of China (NSFC) [61531016, 61271090, 61401375]
- project of Science and Technology Support Program of Sichuan Province [2015GZ0103]
- Fundamental Research Funds for the Central Universities [2682014RC24, 2682015CX065]
- Doctoral Innovation Funds of Southwest Jiaotong University
- China Scholarship Council [201407000007]
This letter presents a multilayer approach for suppressing the higher order modes of substrate integrated waveguide (SIW) bandpass filters. Rectangular SIW resonators in multilayer substrates can be vertically coupled with magnetic and/or electric coupling by the proposed apertures etched on the middle metal layer. Harmonic passbands produced by the first higher-order mode TE102 can be suppressed thanks to the proposed weak coupling or mixed coupling schemes in connection with the TE102 mode. Compared with conventional horizontally coupled filter, the proposed filters also show a compact physical size. To demonstrate the proposed design method, two double-layered SIW bandpass filters Filter (I and II) are fabricated and measured. The experimental results show that the maximum rejection levels at the TE102 mode frequencies are below -30 dB and -20 dB for Filter I and II, respectively. Furthermore, simulated and measured results also show a good agreement.
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