Bandpass Filters with 2N+1 Transmission Zeros at Real Frequencies

This paper discusses N-order bandpass filter (BPF) with all mixed couplings between adjacent resonators, and between end resonators and loads. It has (2 N + 1) transmission zeros (TZ) at real frequencies. To the existing ( N + 1) TZs generated by mixed couplings, another N TZs are added, which gener...

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Bibliographic Details
Published in:Radioelectronics and communications systems 2023, Vol.66 (6), p.315-321
Main Authors: Litvintsev, Sergii, Zakharov, Alexander
Format: Article
Language:English
Subjects:
Bandpass filters
Communications Engineering
Couplings
Engineering
Networks
Resonant frequencies
Resonators
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Summary:This paper discusses N-order bandpass filter (BPF) with all mixed couplings between adjacent resonators, and between end resonators and loads. It has (2 N + 1) transmission zeros (TZ) at real frequencies. To the existing ( N + 1) TZs generated by mixed couplings, another N TZs are added, which generated by resonators with special properties. Each such resonator is a λ/4 resonator, in which the connection point is located relatively close to the short-circuited end. In this case, the input admittance of the resonator Y (jω) has a pole ω p , which is located to the right and at a small distance from the main resonant frequency ω 0 . This pole ω p of the Y (jω) function leads to the appearance of a right-handed TZ in a BPF characteristic. If we use N resonators with different connection points, then N additional TZs will appear. The design of that BPF is considered. The measured and simulated frequency responses of the second-order BPF with 5 TZs are presented.
ISSN:0735-2727
1934-8061
DOI:10.3103/S0735272723100035