1. The Design of Miniature Multilayer Bandpass Filters With Mixed Couplings.
- Author
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Qian, Shilong, Brand, Gerdus, Hong, Jiasheng, and Meyer, Petrie
- Subjects
MINIATURE electronic equipment design & construction ,RESONATOR filters ,MAGNETIC coupling ,BANDPASS filter design & construction ,PROTOTYPES ,BANDWIDTHS - Abstract
This paper introduces a new design process for miniature coupled resonator filters with mixed couplings, which can better preserve wideband response matching with coupling matrix prototype. A special type of matrix transformation is introduced in this paper to transform the coupling matrix into a configuration that consists of an equal number of capacitive and inductive main couplings. Based on this, lumped-element circuit models can be produced. Then, by using \pi to \bf T transformations for some parts of the circuit, all the elements have realizable values. A miniature bandpass filter with a fractional bandwidth of 20% of this type based on N\times N coupling matrix is demonstrated with both simulated and measured response. The filter is implemented using multilayer liquid crystal polymer circuit technology and has a compact size of 0.0294\lambda g \times 0.0303\lambda g \times 0.00052\lambda g, where \lambda g is the guided wavelength at the center frequency of 250 MHz. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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