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New coaxial low-pass filters with ultra-wide and spurious free stopband

Published online by Cambridge University Press:  17 November 2021

Rousslan Goulouev Open the ORCID record for Rousslan Goulouev [Opens in a new window] ,
Colin McLaren  and
Marta Padilla Pardo
Rousslan Goulouev*
Affiliation:
Honeywell Aerospace, Unit 10, Triangle Business Park, Stoke Mandeville, AylesburyHP22 5SX, UK
Colin McLaren
Affiliation:
Honeywell Aerospace, Unit 10, Triangle Business Park, Stoke Mandeville, AylesburyHP22 5SX, UK
Marta Padilla Pardo
Affiliation:
Honeywell Aerospace, Unit 10, Triangle Business Park, Stoke Mandeville, AylesburyHP22 5SX, UK
*
Author for correspondence: R. Goulouev, E-mail: Rousslan.goulouev@honeywell.com
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Abstract

Modern space communication systems often need high-power low-frequency (UHF, L-, S-, and C-band) low-pass filters (LPFs) with wide stopbands extending to Ka-band and beyond. Current design approaches frequently fail to meet these requirements completely. This paper proposes a new coaxial LPF concept and design methodology. The LPF consists of an array of cavity elements, which operate with transverse electromagnetic mode (TEM) and transverse magnetic (TM)-coupled resonances, and thus achieve a frequency response with a reflection zero at DC and transmission zeroes at targeted stopband locations. The design method is based on positioning the cavities in a quasi-periodic order, which efficiently spreads the transmission zeroes over the stopband, while keeping the characteristic impedance matched to the input/output interfaces over the passband. This design concept yields an ultra-wide, continuous and modal spurious-free stopband, while maintaining a low insertion loss, high peak power capacity, and low sensitivity to production tolerances.

Keywords

Microwave filterpassive componentlowpassperiodic structurecoaxialspurious
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. 259 - 269
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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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