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Reconfigurable diplexer using hybrid couplers and perturbed TE012 cavities

Published online by Cambridge University Press:  19 May 2021

E. Laplanche ,
O. Tantot ,
N. Delhote Open the ORCID record for N. Delhote [Opens in a new window] ,
S. Verdeyme ,
A. Perigaud ,
D. Pacaud  and
L. Carpentier
E. Laplanche
Affiliation:
XLIM – CNRS 123, Avenue Albert Thomas, 87060Limoges Cedex, France Thales Alenia Space, 26 Avenue Jean François Champollion, 31100Toulouse, France
O. Tantot
Affiliation:
XLIM – CNRS 123, Avenue Albert Thomas, 87060Limoges Cedex, France
N. Delhote*
Affiliation:
XLIM – CNRS 123, Avenue Albert Thomas, 87060Limoges Cedex, France
S. Verdeyme
Affiliation:
XLIM – CNRS 123, Avenue Albert Thomas, 87060Limoges Cedex, France
A. Perigaud
Affiliation:
XLIM – CNRS 123, Avenue Albert Thomas, 87060Limoges Cedex, France
D. Pacaud
Affiliation:
Thales Alenia Space, 26 Avenue Jean François Champollion, 31100Toulouse, France
L. Carpentier
Affiliation:
CNES, 18 Avenue Edouard Belin, 31400Toulouse, France
*
Author for correspondence: N. Delhote, E-mail: [email protected]
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Abstract

A continuously tunable Ku-band waveguide diplexer is proposed in this paper. This diplexer is based on a hybrid coupler topology and is composed of an input filter centered at 11.9 GHz with a 200 MHz bandwidth, a pair of ladder-type hybrid couplers, and a pair of tunable filters. This diplexer can provide two bandpass channels (channels 1 and 2) that can continuously go from a state where the bandwidths of channels 1 and 2 are maximum (up to 140 MHz) and minimum (down to 40 MHz), respectively, to another configuration where the bandwidth of channel 1 is the largest and the bandwidth of channel 2 is the narrowest. We propose a tunable filter based on TE012 mode circular cavities that are perturbed by low-loss dielectric inserts to obtain such performance. The resonant frequency of these cavities can be continuously tuned between 11.8 and 12 GHz due to the linear movement of the dielectric perturber. The design process for these components is presented and a breadboard device has been manufactured and measured to prove the concept. Different measured configurations of the diplexer are demonstrated, showing that the 200 MHz operating bandpass between 11.8 and 12 GHz can be efficiently separated into two tunable channels. The measured bandwidth of channels 1 and 2 in the manufactured diplexer can be tuned from 135 to 40 MHz (and vice versa) while maintaining an average guard band between the channels of approximately 26 ± 7 MHz. The obtained bandwidth tuning ratios are 3.2 for the highest channel and 3.1 for the lowest channel.

Keywords

Hybrid coupled diplexertunable diplexertunable filterswaveguide filters
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Special Issue 3: Filters and Multiplexers for Satellite Communications Systems , April 2022 , pp. 351 - 361
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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