Generalized Miniaturization Method for Coupled-Line Bandpass Filters by Reactive Loading

This paper presents a generalized miniaturization method for coupled-line bandpass filters by reactive loading, including the series-inductive loading method that is proposed in this work. It is shown that bandwidth reduction seen in the previous miniaturization method of shunt-capacitive loading is...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2010-09, Vol.58 (9), p.2383-2391
Main Authors: LEE, Seungku, LEE, Yongshik
Format: Article
Language:English
Subjects:
Applied sciences
Band pass filters
Bandpass filters
Bandwidth
Capacitors
Circuit properties
Coupled line
coupled-line bandpass filter
Design methodology
Dielectric, amorphous and glass solid devices
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Fabrication
filter bandwidth
Flexibility
Frequency filters
Image analysis
Impedance
Inductors
Joining
Magnetic devices
Microwaves
Miniaturization
miniaturized filter
Propagation constant
Reactance
reactive loading
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
series inductor
Shunt (electrical)
shunt capacitor
Studies
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Summary:This paper presents a generalized miniaturization method for coupled-line bandpass filters by reactive loading, including the series-inductive loading method that is proposed in this work. It is shown that bandwidth reduction seen in the previous miniaturization method of shunt-capacitive loading is a special case. In fact, one can choose a coupled-line filter to be miniaturized with its bandwidth reduced, expanded, or maintained after miniaturization. The ratio of the bandwidths before and after miniaturization plays an important role in determining the even-/odd-mode impedance, as well as the reactance levels after miniaturization. Therefore, the freedom in choosing the bandwidth ratio provides a great flexibility in miniaturizing coupled-line filters since one can choose an appropriate bandwidth ratio to maintain the impedance and reactance at practical levels after miniaturization. The proposed generalized miniaturization method enables filter designs focused on size reduction, improved stopband response, low-cost fabrication, or a combination of these, which are verified by experimental results.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2010.2058281