Spurious Suppression Techniques for 3-D Printed Coaxial Resonator Bandpass Filters

Kunchen Zhao; Dimitra Psychogiou

doi:10.1109/LMWC.2021.3112406

Spurious Suppression Techniques for 3-D Printed Coaxial Resonator Bandpass Filters

Kunchen Zhao
, Dimitra Psychogiou

School of Engineering and Architecture

University of Colorado Boulder

Research output: Contribution to journal › Article › peer-review

Abstract

Design methods to enhance the passband-to-stopband bandwidth of coaxial bandpass filters (BPFs) are reported. Stopband enhancement is achieved by: 1) introducing a transmission zero (TZ) through mixed electromagnetic (EM) coupling and 2) by reducing the RF signal coupling to one of the spurious modes by varying the relative orientation of the RF posts. A low-cost additive manufacturing (AM) concept is proposed as the key-enabling integration scheme for these types of filters due to 1) easing the manufacturing of otherwise complex geometries and 2) allowing for monolithic integration. For proof-of-concept demonstration purposes a two-pole prototype and a four-pole prototype were designed at 3.5 and 3.6 GHz. They were manufactured using a low-cost stereolithography apparatus (SLA)-based 3-D printer. The BPFs exhibited low insertion loss (IL < 0.5 dB) and a 4.5 stopband-to-passband ratio with 35 dB rejection, which is the highest among the existing spurious-free coaxial cavity-based BPFs.

Original language	English
Pages (from-to)	33-36
Number of pages	4
Journal	IEEE Microwave and Wireless Components Letters
Volume	32
Issue number	1
DOIs	https://doi.org/10.1109/LMWC.2021.3112406
Publication status	Published - 1 Jan 2022

Keywords

Additive manufacturing (AM)
bandpass filter (BPF)
coaxial cavity filters
spurious-free filter

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/LMWC.2021.3112406

https://hdl.handle.net/10468/12379Licence: CC BY-NC-ND

Cite this

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title = "Spurious Suppression Techniques for 3-D Printed Coaxial Resonator Bandpass Filters",

abstract = "Design methods to enhance the passband-to-stopband bandwidth of coaxial bandpass filters (BPFs) are reported. Stopband enhancement is achieved by: 1) introducing a transmission zero (TZ) through mixed electromagnetic (EM) coupling and 2) by reducing the RF signal coupling to one of the spurious modes by varying the relative orientation of the RF posts. A low-cost additive manufacturing (AM) concept is proposed as the key-enabling integration scheme for these types of filters due to 1) easing the manufacturing of otherwise complex geometries and 2) allowing for monolithic integration. For proof-of-concept demonstration purposes a two-pole prototype and a four-pole prototype were designed at 3.5 and 3.6 GHz. They were manufactured using a low-cost stereolithography apparatus (SLA)-based 3-D printer. The BPFs exhibited low insertion loss (IL < 0.5 dB) and a 4.5 stopband-to-passband ratio with 35 dB rejection, which is the highest among the existing spurious-free coaxial cavity-based BPFs.",

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author = "Kunchen Zhao and Dimitra Psychogiou",

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N2 - Design methods to enhance the passband-to-stopband bandwidth of coaxial bandpass filters (BPFs) are reported. Stopband enhancement is achieved by: 1) introducing a transmission zero (TZ) through mixed electromagnetic (EM) coupling and 2) by reducing the RF signal coupling to one of the spurious modes by varying the relative orientation of the RF posts. A low-cost additive manufacturing (AM) concept is proposed as the key-enabling integration scheme for these types of filters due to 1) easing the manufacturing of otherwise complex geometries and 2) allowing for monolithic integration. For proof-of-concept demonstration purposes a two-pole prototype and a four-pole prototype were designed at 3.5 and 3.6 GHz. They were manufactured using a low-cost stereolithography apparatus (SLA)-based 3-D printer. The BPFs exhibited low insertion loss (IL < 0.5 dB) and a 4.5 stopband-to-passband ratio with 35 dB rejection, which is the highest among the existing spurious-free coaxial cavity-based BPFs.

AB - Design methods to enhance the passband-to-stopband bandwidth of coaxial bandpass filters (BPFs) are reported. Stopband enhancement is achieved by: 1) introducing a transmission zero (TZ) through mixed electromagnetic (EM) coupling and 2) by reducing the RF signal coupling to one of the spurious modes by varying the relative orientation of the RF posts. A low-cost additive manufacturing (AM) concept is proposed as the key-enabling integration scheme for these types of filters due to 1) easing the manufacturing of otherwise complex geometries and 2) allowing for monolithic integration. For proof-of-concept demonstration purposes a two-pole prototype and a four-pole prototype were designed at 3.5 and 3.6 GHz. They were manufactured using a low-cost stereolithography apparatus (SLA)-based 3-D printer. The BPFs exhibited low insertion loss (IL < 0.5 dB) and a 4.5 stopband-to-passband ratio with 35 dB rejection, which is the highest among the existing spurious-free coaxial cavity-based BPFs.

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KW - spurious-free filter

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Spurious Suppression Techniques for 3-D Printed Coaxial Resonator Bandpass Filters

Abstract

Keywords

UN SDGs

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