An X-Band Microstrip Phase Shifter Using an Electromagnetic Bandgap Backplane

Dowon KIM  Moonil KIM  Hao XIN  Jon B. HACKER  

IEICE TRANSACTIONS on Communications   Vol.E88-B   No.6   pp.2632-2635
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.6.2632
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Devices/Circuits for Communications
microstrip phase shifter,  electromagnetic bandgap,  EBG,  

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A new microstrip compatible phase shifter circuit is introduced. The phase shifter uses a strip-type electromagnetic bandgap (EBG) substrate in place of the solid metal ground plane. Such EBG substrates, when made of ferroelectric materials, can produce variable phase constants useful for phase shifter applications. Test models using two different EBG substrates with dielectric constants of 9.2 and 10.2 showed 44.5 degrees of phase difference with 1.7 dB of added insertion loss at 10 GHz from a line originally 504 degrees long.