An LTCC balanced-to-unbalanced extracted-pole bandpass filter with complex load
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AbstractIn this paper, the fundamental characteristics of "novel third-order RF balanced-to-unbalanced filter, namely," 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 RI? front-end modules. Experimental measurements are also presented to validate the theory and computer simulations.
All Author(s) ListYeung LK, Wu KL
Journal nameIEEE Transactions on Microwave Theory and Techniques
Volume Number54
Issue Number4
Pages1512 - 1518
LanguagesEnglish-United Kingdom
Keywordsbalun; bandpass filter; low-temperature co-fired ceramic (LTCC); resonator filter
Web of Science Subject CategoriesEngineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC

Last updated on 2020-05-12 at 00:04