Numerical Results for Group Delay of Minimum Phase Bandpass Filters

We prove that the Chebyshev sharpening technique, recently introduced in literature, provides filters with a Minimum Phase (MP) characteristic when it is applied to cosine filters. Additionally, we demonstrate that cascaded expanded Chebyshev-Sharpened Cosine Filters (CSCFs) are also MP filters, and we show that they achieve a lower group delay for similar magnitude characteristics in comparison with traditional cascaded expanded cosine filters. The importance of the characteristics of cascaded expanded CSCFs is also elaborated. The developed examples show improvements in the group delay ranged from 23% to 47% at the cost of a slight increase of usage of hardware resources. For an application of a low-delay decimation filter, the proposed scheme exhibits a 24% lower group delay, with 35% less computational complexity (estimated in Additions per Output Sample) and slightly less usage of hardware elements.

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Group delay analysis of differential-mode coupled four lines bandpass filters

2006 Asia-Pacific Microwave Conference ◽

10.1109/apmc.2006.4429635 ◽

2006 ◽

Author(s):

Kyoung-Pyo Ahn ◽

Akira Saitou ◽

Kazuhiko Honjo

Keyword(s):

Group Delay ◽

Bandpass Filters ◽

Delay Analysis ◽

Differential Mode

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RF design of acoustic-wave-lumped-element-resonator-(AWLR)-based bandpass filters with constant in-band group delay

2017 IEEE MTT-S International Microwave Symposium (IMS) ◽

10.1109/mwsym.2017.8058899 ◽

2017 ◽

Cited By ~ 2

Author(s):

Dimitra Psychogiou ◽

Roberto Gomez-Garda ◽

Dimitrios Peroulis

Keyword(s):

Acoustic Wave ◽

Group Delay ◽

Bandpass Filters ◽

Lumped Element ◽

Rf Design ◽

Band Group

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Miniaturized Microstrip Diplexer Based on FR4 Substrate for Wireless Communications

Elektronika ir Elektrotechnika ◽

10.5755/j02.eie.28942 ◽

2021 ◽

Author(s):

Hussein Ali Hussein ◽

Yaqeen Sabah Mezaal ◽

Ban M. Alameri

Keyword(s):

Wireless Communications ◽

Group Delay ◽

Narrow Band ◽

Bandpass Filters ◽

Substrate Material ◽

Negative Group ◽

Input Output ◽

Scattering Parameter ◽

Frequency Responses ◽

Dual Channels

In this paper, the miniaturized microstrip diplexer has been designed for dual channels based on FR4 substrate material. It consists of two bandpass filters (BPFs) functioning under dissimilar frequency bands coupled with a unified junction. Every BPF has been created by a meandered line resonator, step impedance resonator, uniform impedance resonator, and input/output feed lines. The AWR electromagnetic simulator has been used for characterizing the frequency responses of the projected diplexer. Noble scattering parameter results with narrow band responses and negative group delay values are obtained for the proposed diplexer. The microstrip diplexer has an interesting band isolation between the two filters around 31 dB. The device has been successfully fabricated and verified with the simulations.

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