Title :
A Miniature Low-Loss Slow-Wave Tunable Ferroelectric BandPass Filter From 11-14 GHz
Author :
Papapolymerou, John ; Lugo, Cesar ; Zhao, Zhiyong ; Wang, Xiaoyan ; Hunt, Andrew
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA
Abstract :
This paper presents for the first time a miniature, tunable slow-wave 2-pole ferroelectric filter with low loss operating from 11.5-14 GHz (20% tuning). The filter consists of sections of coplanar waveguide transmission lines that are loaded with high quality factor tunable ferroelectric capacitors with BST material. Each resonator section is loaded with a total of 12 capacitors resulting in a very compact size. Coupling between the slow-wave resonators, as well as matching with the input/output ports is achieved via inductive stubs. The measured insertion loss varies from 5.4 to 3.3 dB from 11.5-14 GHz and a bias voltage range from 0-30 V. The third-order intercept of the filter was found to be around 31 dBm. To the best of our knowledge, this is the smallest loss performance for such a filter in the 11-14 GHz range
Keywords :
Q-factor; band-pass filters; circuit tuning; coplanar transmission lines; coplanar waveguides; ferroelectric capacitors; poles and zeros; slow wave structures; 0 to 30 V; 11 to 14 GHz; 2-pole ferroelectric filter; 5.4 to 3.3 dB; BST material; coplanar waveguide transmission lines; inductive stubs; quality factor; slow-wave bandpass filter; slow-wave resonators; tunable ferroelectric bandpass filter; tunable ferroelectric capacitors; Band pass filters; Binary search trees; Capacitors; Coplanar transmission lines; Coplanar waveguides; Couplings; Ferroelectric materials; Impedance matching; Q factor; Resonator filters;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249653
