Lead-Strontium-Titanate varactor-tuned CPW bandstop filter on liquid crystal polymer substrates

Author

Chun, Young-Hoon ; Keller, Roman ; Hong, Jia-Sheng ; Fragkiadakis, Charalampos ; Wright, Robert V. ; Kirby, Paul B.

Author_Institution

Dept. of Electr., Electron. & Comput. Eng., Heriot-Watt Univ., Edinburgh, UK

fYear

2009

fDate

Sept. 29 2009-Oct. 1 2009

Firstpage

1373

Lastpage

1376

Abstract

This paper presents an investigation of a tunable coplanar waveguide (CPW) bandstop filter with slotted ground structure. Spurious responses resulting from the shapes of resonator and the tuning position have been investigated by EM simulations. As a tuning element, Lead- Strontium- Titanate (PST) varactor chip is deployed. Also, in order to reduce required elements and unwanted spurious, LCP substrates are used as multi-layered laminates. A 2-pole tunable bandstop filter of this type is measured at the center frequency from 905 to 1040 MHz and its maximum rejection is more than 25 dB at the stopband with a wide passband response.

Keywords

band-stop filters; coplanar waveguides; liquid crystal polymers; substrates; varactors; 2-pole tunable bandstop filter; LCP substrates; lead-strontium-titanate varactor chip; lead-strontium-titanate varactor-tuned CPW bandstop filter; liquid crystal polymer substrates; multilayered laminates; slotted ground structure; tunable coplanar waveguide; tuning element; Coplanar waveguides; Laminates; Lead; Liquid crystal polymers; Resonator filters; Shape; Strontium compounds; Titanium compounds; Tuning; Varactors;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2009. EuMC 2009. European

Conference_Location

Rome

Print_ISBN

978-1-4244-4748-0

Type

conf

Filename

5296397