Miniaturized microstrip suppressing lowpass cell for hybrid applications

In this paper, a very small microstrip low-pass filter (LPF) has presented for utilization in microwave systems. This device is composed of mirrored stepped impedances with two boxes at each side. A transfer function has been extracted from the relevant LC circuit, which expresses the function of th...

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Bibliographic Details
Published in:International journal of electronics and communications 2021-06, Vol.135, p.153734, Article 153734
Main Authors: Imani, Mohammad Sajad, Imani, Mohammad Amin, Soltani, Amir, Shama, Farzin
Format: Article
Language:English
Subjects:
Harmonic suppression
Lowpass filter
Miniaturization
Resonator
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Summary:In this paper, a very small microstrip low-pass filter (LPF) has presented for utilization in microwave systems. This device is composed of mirrored stepped impedances with two boxes at each side. A transfer function has been extracted from the relevant LC circuit, which expresses the function of this design. The operating frequency of the LPF is located at 3.5 GHz. The proposed LPF blocks a wide rejection with a rejection level of −20 dB or stronger. The return loss of 33 dB is another competence of the LPF. The overall size of the fabricated prototype is 9.5 mm × 5.8 mm (56 mm2). These dimensions maybe give the most compact lowpass filter operating in such frequency among the published work until now. The measurement results mimic the simulations.
ISSN:1434-8411
1618-0399
DOI:10.1016/j.aeue.2021.153734