Title :
Possibility of ultra fine isolator for portable phone
Author :
Takeda, S. ; Kishimoto, Y. ; Itoh, H. ; Ichikawa, K.
Author_Institution :
Hitachi Metals Ltd., Tokyo, Japan
Abstract :
There exists a trade-off relationship between miniaturization of an isolator for portable phones and its specific bandwidth. In this paper, we introduce a new way to increase bandwidth over 13%, in spite of a reduction in garnet dimensions by one tenth, by the addition of LC impedance matching circuits. In the preliminary experiments, we obtained a 4 mm square isolator with 4.1% bandwidth at 836 MHz using LTCC technology.
Keywords :
UHF devices; cellular radio; ferrite isolators; impedance matching; telephone sets; 836 MHz; LC impedance matching circuits; LTCC technology; bandwidth; garnet; miniaturization; portable phone; ultra fine isolator; Bandwidth; Capacitance; Circuits; Garnets; Impedance matching; Inductance; Isolation technology; Isolators; Magnetic resonance; Resonant frequency;
Conference_Titel :
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6538-0
DOI :
10.1109/MWSYM.2001.966935
