Monolithic 180and 360Analog Phase Shifters Based on Barium Strontium Titanate Coated Sapphire Substrates

Dongsu KIM, Yoonsu CHOI, Minsik AHN, Mark G. ALLEN, J. Stevenson KENNEY

Summary :

The design, fabrication, and characterization of monolithic analog phase shifters based on barium-strontium-titanate (BST) coated sapphire substrates with continuously variable 180and 360phase-shift ranges are presented. The phase shifter using a single series resonated termination can provide 180phase shift with the chip area of 4 mm 4 mm. A double series resonated termination in a parallel connection can reach over 370phase shift with better than 6.8 dB-loss at 2.4 GHz. Also, an all-pass network phase shifter composed of only lumped LC elements was described here. This phase shifter demonstrated 160phase shift with an insertion loss of 3.1 dB 1 dB and return loss of better than 10 dB at 2.4 GHz. The total size of the phase shifter is only 2.4 mm 2.6 mm, which is the smallest reported BST phase shifter operating at S-band, to the best of the authors' knowledge.

• Publication: IEICE TRANSACTIONS on Electronics Vol.E86-C No.8 pp.1607-1612
• Publication Date: 2003/08/01
• Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)

Authors

Dongsu KIM
Yoonsu CHOI
Minsik AHN
Mark G. ALLEN
J. Stevenson KENNEY

Keyword

ferroelectrics,  barium strontium titanate,  interdigital capacitor,  varactor,  phase shifter