Improved performance step impedance lowpass filter

Arun Kumar Verma

doi:10.1016/j.aeue.2013.03.003

Improved performance step impedance lowpass filter

2013-09-01

14

PRE

AI

DOI：10.1016/j.aeue.2013.03.003

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Performances of the conventional Butterworth step impedance lowpass filters (LPF) are significantly improved by placing transmission zero either closer to the cut-off frequency (f(c)) or away from it. It is achieved by using transverse resonance width of the capacitive line sections. We report method of designing transverse resonance type LPF (TR-LPF) for 5 to 11-pole filters. At f(c) = 2.5 GHz, we obtained selectivity in the range 113.3-56.66 dB/GHz and 20-60 dB rejection BW in the range 9.61-7.29 GHz. The TR-LPF can suppress the stopband signal by 60 dB up to 5f(c). Insertion loss in passband is within 0.72 dB. Improved performance of TR-LPF can be designed for f(c) up to 7.5 GHz. (C) 2013 Elsevier GmbH. All rights reserved.

Keyword:

Low-pass filter (LPF)

Microstrip

Transverse resonance (TR)

Transmission zero

Improved performance step impedance lowpass filter

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