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Ultra-low-loss high-pass filter with air-core short-circuit coaxial cable

Published online by Cambridge University Press:  05 July 2017

Hongfei Liu  and
Sander Weinreb
Hongfei Liu*
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences (CAS), Beijing 100012, China Key Laboratory of Radio Astronomy, Chinese Academy of Science (CAS), Nanjing 210008, China
Sander Weinreb
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA
*
Corresponding author: H. Liu Email: lhf@bao.ac.cn
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Abstract

This paper presents a novel ultra-low-loss high-pass filter with 3 dB cutoff frequency of 890 MHz for astronomical receiver radio frequency interference mitigation application. The filter consists of three series capacitors, four shunt inductors, and microstrip circuit board. Specially, 4 shunt inductors are actualized by fabricating air-core short-circuit coaxial cable inductors in the filter box body, and the quality factor of these cable inductors is up to 762.2 and 1046, respectively, at 1.4 GHz. In the expected passband of 1.1–1.9 GHz, S parameters measurement show that insertion loss is lower than 0.16 dB and two-port return loss is larger than 20 dB; noise measurement show that filter noise temperature is lower than 8 at 300 K ambient temperature. Noise sources of this filter are analyzed by simulation and measurement.

Keywords

High-pass filterUltra-low lossShort-circuit coaxial inductor
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 9 , November 2017 , pp. 1817 - 1820
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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References

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