Two- and Four-Pole Multilayer SIW Filter with High Selectivity and Higher-Order Mode Suppression
-
Dinghong Jia
,
Quanyuan Feng
Abstract
This letter presents an approach to design two-pole source-load coupling and four-pole cross-coupling substrate integrated waveguide (SIW) bandpass filters based on multilayer process. Utilizing the field distribution, the vertical magnetic and electric coupling of fundamental mode is designed by suppressing the first spurious mode. Then, source-load and cross-coupling schemes are realized with controllable features in two-pole and four-pole filters, respectively. The harmonic passband produced by TE102 mode can be suppressed by proper coupling technique enabling the connection with TE102 mode in two- and four-pole filter designs, respectively. Three transmission zeros, which are derived from source-load coupling, are introduced around the passband of two-pole filter to improve its selectivity. In the four-pole filter design, a six-order cross-coupling scheme including source and load produces four transmission zeros around the passband, leading to a sharp selectivity. In addition, another transmission zero is generated at the adjacent location of the passband to improve the out-of-band rejection. Compared with conventional horizontally coupled filters made of single layer, the proposed filters show a compact size. To demonstrate the proposed design method, a two-pole and a four-pole double-layered SIW bandpass filters are fabricated and measured. Measured results show that the proposed filters exhibit high selectivity and good out-of-band rejection, as well as a good agreement between simulated and measured results.
Acknowledgements
This work was supported by and the National Key R&D Program of China under Grant 2018YFF0109300 and 2018YFF0109700, the National Natural Science Foundation of China (NSFC) under Grant 61531016, 61271090, 61401375 and 61771408, the project of Science and Technology Support Program of Sichuan Province under Grant 2016GZ0059, the Fundamental Research Funds for the Central Universities under Grant 2682014RC24 and 2682015CX065, the Science and Technology on Electronic Test & Measurement Laboratory under Grant 9140C120102150C12055 and 6142001010101.
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© 2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Research Articles
- A Wideband Polarization Reconfigurable Antenna Array Based on Mode Combination Method
- RCS Enhancement of Dielectric Resonator Tag Using Spherical Lens
- Design and Analysis of Full and Half Mode Substrate Integrated Waveguide Planar Leaky Wave Antenna with Continuous Beam Scanning in X-Ku Band
- A Multi-Thresholding Method Based on Otsu’s Algorithm for the Detection of Concealed Threats in Passive Millimeter-Wave Images
- Investigation of Nanomaterial Dipoles for SAR Reduction in Human Head
- A Balanced Dual-Band BPF Based on C-CSRR with Improved Passband Selectivity
- Two- and Four-Pole Multilayer SIW Filter with High Selectivity and Higher-Order Mode Suppression
- Microstrip Lowpass Filter with Ultra-Wide Stopband Using Folded Structures
Articles in the same Issue
- Frontmatter
- Research Articles
- A Wideband Polarization Reconfigurable Antenna Array Based on Mode Combination Method
- RCS Enhancement of Dielectric Resonator Tag Using Spherical Lens
- Design and Analysis of Full and Half Mode Substrate Integrated Waveguide Planar Leaky Wave Antenna with Continuous Beam Scanning in X-Ku Band
- A Multi-Thresholding Method Based on Otsu’s Algorithm for the Detection of Concealed Threats in Passive Millimeter-Wave Images
- Investigation of Nanomaterial Dipoles for SAR Reduction in Human Head
- A Balanced Dual-Band BPF Based on C-CSRR with Improved Passband Selectivity
- Two- and Four-Pole Multilayer SIW Filter with High Selectivity and Higher-Order Mode Suppression
- Microstrip Lowpass Filter with Ultra-Wide Stopband Using Folded Structures
