Title :
Improved lumped-element two-port isolator
Author :
Takeda, S. ; Mikami, H. ; Ichikawa, K.
Author_Institution :
Inf. Syst. Components Co., Adv. Technol. Res. Lab., Tokyo, Japan
Abstract :
In a lumped-element two-port isolator, the relationship between the angle across two central conductors and electric characteristics is revealed using circuit analysis. At /spl phi/=90 degree, high isolation loss is achieved. At /spl phi/=60 degree, the bandwidth of insertion loss becomes maximum. This theoretical prediction at /spl phi/=60 degree was confirmed qualitatively by 360 MHz band experiments. Furthermore, we obtained the interesting result that the perfect isolation conditions at /spl phi/=60 degree is quite similar to three-port circulator conditions.
Keywords :
UHF devices; electric admittance; equivalent circuits; ferrite isolators; losses; matrix algebra; network analysis; 360 MHz; admittance matrix; angular dependency; central conductors; circuit analysis; electric characteristics; high isolation loss; lumped-element two-port isolator; maximum insertion loss bandwidth; Admittance; Capacitors; Circuit analysis; Conductors; Equations; Impedance; Information systems; Isolators; Symmetric matrices; Wounds;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1210965
