Design of Compact Dual-Band LTCC Second-Order Chebyshev Bandpass Filters Using a Direct Synthesis Approach

A new lumped-element circuit model suitable for dual-band bandpass filter (D-BPF) response is proposed. Using even-/odd-mode analysis, analytical equations are developed and used for the development of a direct synthesis design procedure. The proposed procedure is applied to the design and realizati...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2019-04, Vol.67 (4), p.1441-1451
Main Authors: Pourzadi, Aref, Isapour, Aria, Kouki, Ammar
Format: Article
Language:English
Subjects:
Attenuation
Bandpass filters
Ceramics industry
Chebyshev approximation
Dual band
Dual-band bandpass filter (D-BPF)
even-/odd-mode analysis
Filtering theory
four-pole network
inductive coupling
Insertion loss
low-temperature cofired ceramic (LTCC)
Microwave circuits
Poles and zeros
Resonant frequency
Resonators
Synthesis
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Description
Summary:A new lumped-element circuit model suitable for dual-band bandpass filter (D-BPF) response is proposed. Using even-/odd-mode analysis, analytical equations are developed and used for the development of a direct synthesis design procedure. The proposed procedure is applied to the design and realization of a D-BPF prototype in low-temperature cofired ceramic technology covering two industrial-scientific-medical (ISM) bands of 0.9 and 2.45 GHz. This filter has been successfully measured with an insertion loss of less than 2 dB, return loss better than 18 dB for both bands and out-of-band attenuation higher than 20 dB.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2019.2898197