A NOVEL QUASI-ELLIPTIC WAVEGUIDE TRANSMIT REJECT FILTER FOR KU-BAND VSAT TRANSCEIVERS

In this paper, a novel compact quasi-elliptic waveguide low-pass transmit reject filter (TRF) by using T-shape units is proposed for Ku-band very small aperture terminal (VSAT) transceivers. The equivalent circuit model of the T-shape unit is investigated and shows a topology similar to that of the...

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Bibliographic Details
Published in:Electromagnetic waves (Cambridge, Mass.) Mass.), 2011-01, Vol.117, p.393-407
Main Authors: Xu, Z.-B, Guo, J, Qian, C, Dou, W.-B
Format: Article
Language:English
Subjects:
Analysis
Design and construction
Engineering design
Equipment and supplies
Methods
Transceivers
Waveguides
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Summary:In this paper, a novel compact quasi-elliptic waveguide low-pass transmit reject filter (TRF) by using T-shape units is proposed for Ku-band very small aperture terminal (VSAT) transceivers. The equivalent circuit model of the T-shape unit is investigated and shows a topology similar to that of the elliptic low-pass filter. In order to reduce the difficulty in physical realization, which is commonly encountered with a standard elliptic low-pass filter, an approximate elliptic low-pass filter prototype is presented. Accordingly, a synthesis approach is developed to obtain the initial dimensions of the filter. To optimize the performance of the filter, full-wave electromagnetic simulation is used to fine-tune the dimensions of the filter. An eleven-order Ku-band low-pass TRF is designed and fabricated using a WR-75 waveguide. Measured results show it has a low insertion loss of less than 0.3 dB in the pass band and a high attenuation slope of 78dB/GHz. Moreover, the miniaturized size of the filter is only 38 mm x 38 mm x 42 mm (WR-75 flange size is 38mm x 38mm).
ISSN:1559-8985
1070-4698
1559-8985
DOI:10.2528/PIER11051601