Title :
A study on transducer type isolator using YIG single crystal
Author :
Okubo, Kensuke ; Tsutsumi, Makoto
Author_Institution :
Dept. of Commun. Eng., Okayama Prefectural Univ., Okayama
Abstract :
A transducer type isolator is proposed using tangentially magnetized YIG single crystal. The single crystal is analyzed by the finite element method. Frequency response of scattering parameters and field distribution were calculated and optimized by using high frequency structure simulator. Experiments were undertaken using a single crystal of YIG slab, and measured results corresponded well to the numerical results. Isolation ratio of 48 dB with 6 dB insertion loss and 880 MHz bandwidth around 4.2 GHz was measured. Characteristics using composite right/left-handed transmission lines (CRLH-TL) transducers were also investigated and isolation ratio of 48 dB with 5.5 dB insertion loss and 2.0 GHz bandwidth (from 3.85 GHz to 5.85 GHz) was measured. Proposed isolator has potential for high dynamic isolation ratio and wideband operation. It may be developed more with careful design of capacitive and inductive loadings of the CRLH structure.
Keywords :
finite element analysis; microwave isolators; transducers; transmission lines; yttrium compounds; YFeO; capacitive loadings; composite right-left-handed transmission lines; field distribution; finite element method; high frequency structure simulator; inductive loadings; insertion loss; isolation ratio; scattering parameters; tangentially magnetized YIG single crystal; transducer type isolator; wideband operation; Bandwidth; Finite element methods; Frequency response; Insertion loss; Isolators; Loss measurement; Magnetic analysis; Magnetic field measurement; Transducers; Transmission line measurements;
Conference_Titel :
Microwave Conference, 2008. APMC 2008. Asia-Pacific
Conference_Location :
Macau
Print_ISBN :
978-1-4244-2641-6
Electronic_ISBN :
978-1-4244-2642-3
DOI :
10.1109/APMC.2008.4957883