New Dual-/Tri-Band Bandpass Filters and Diplexer With Large Frequency Ratio
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
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Detail(s)
Original language | English |
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Journal / Publication | IEEE Transactions on Microwave Theory and Techniques |
Volume | 66 |
Issue number | 6 |
Online published | 16 May 2018 |
Publication status | Published - Jun 2018 |
Link(s)
Abstract
To satisfy the simultaneous requirements of future wireless communication systems on short-range high-speed data transmission and long-distance basic coverage, the coexistence of the millimeter-wave and microwave technologies becomes the inexorable trend. However, it is difficult for the existing dual-/tri-band filter configurations to achieve a frequency ratio larger than three. In this paper, the new use of aperture coupling mechanism is proposed to combine two bandpass elements for dual-/tri-band operation with large frequency ratio but comparable sizes. For this purpose, a microwave BPF with wide stopband up to millimeter-waveband is implemented based on the complementary frequency response characteristics of the stepped-impedance resonator bandpass filter and low-pass filter. The millimeter-wave BPF can be simply designed using the air-filled substrate-integrated waveguide circular cavities, which exhibit the natural low-frequency cutoff characteristics. Based on the proposed design concept and two BPF elements, the dual-/tri-band bandpass filters with frequency ratio up to 12.59 and 12.7 were designed, fabricated, and measured. Owing to the independence of the two elements, a diplexer with large frequency ratio can be simply implemented based on the previous dual-band filter. All the simulation and measured results are in good agreement, validating the proposed structures.
Research Area(s)
- Air-filled substrate-integrated waveguide (SIW), aperture, bandpass filters, diplexer, large frequency ratio, millimeter-wave.
Citation Format(s)
New Dual-/Tri-Band Bandpass Filters and Diplexer With Large Frequency Ratio. / Zheng, Shao Yong; Su, Zhi Li; Pan, Yong Mei; Qamar, Zeeshan; Ho, Derek.
In: IEEE Transactions on Microwave Theory and Techniques, Vol. 66, No. 6, 06.2018.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review