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An LTCC Balanced-to-Unbalanced Extracted-Pole Bandpass Filter With Complex Load.

Authors :
Lap Kun Yeung
Ke-Li Wu
Source :
IEEE Transactions on Microwave Theory & Techniques. Apr2006 Part 1, Vol. 54 Issue 4, p1512-1518. 7p. 2 Black and White Photographs, 5 Diagrams, 1 Chart, 4 Graphs.
Publication Year :
2006

Abstract

In this paper, the fundamental characteristics of a novel third-order RF balanced-to-unbalanced filter, namely, a balun filter, for integrated RF module applications are presented. This center-tapped transformer-based new device works concurrently as a balun, an extracted-pole bandpass filter, and a matching network. As coupled resonant tanks are employed to perform the balun type of operation, traditional coupled-resonator filter theory can thus be used to design and analyze such a new device. Moreover, an extracted-pole technique is used not only for creating a transmission zero, but also provides a capability to match the filter with a complex load. In addition to providing a simple design procedure for the device, its working mechanism is also revealed mathematically. Specifically, return-loss sensitivity with respect to each resonator admittance and complex load matching capability are discussed in details. This balun filter has been implemented in a multilayered low-temperature co-fired ceramic substrate, demonstrating its promising potentials in miniaturized RF front-end modules. Experimental measurements are also presented to validate the theory and computer simulations. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00189480
Volume :
54
Issue :
4
Database :
Academic Search Index
Journal :
IEEE Transactions on Microwave Theory & Techniques
Publication Type :
Academic Journal
Accession number :
20589052
Full Text :
https://doi.org/10.1109/TMTT.2006.871363