Title :
A novel heptagonal microstrip rat-race hybrid coupler with harmonic suppression and size reduction
Author :
Song, Wei ; Deguchi, Hiroyuki ; Tsuji, Mikio
Author_Institution :
Dept. of Electron., Doshisha Univ., Kyotanabe, Japan
Abstract :
A novel heptagonal rat-race hybrid coupler (RRHC) working at the fundamental frequency of 0.9GHz is proposed here, which can realize both miniaturization and harmonic suppression. The novel RRHC based on T-shaped structure on top and spiral defected ground structure (DGS) at the bottom occupies only 31.3% area of a conventional RRHC. The measurement result of the fabricated RRHC shows good agreement with the simulation result and the spurious response is suppressed below 20 dB up to the fourth harmonic.
Keywords :
defected ground structures; harmonics suppression; microstrip couplers; DGS; RRHC; T-shaped structure; frequency 0.9 GHz; harmonic suppression; heptagonal microstrip rat-race hybrid coupler; miniaturization; size reduction; spiral defected ground structure; Couplers; Harmonic analysis; Harmonics suppression; Microstrip; Microwave theory and techniques; Simulation; Spirals;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2012 IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-4673-0461-0
DOI :
10.1109/APS.2012.6348905
