Title :
Miniaturized lumped element isolator operating in weak magnetic field below ferromagnetic resonance
Author :
Hasegawa, Takashi ; Nakajima, Reiji ; Ichiguchi, XShinichiro ; Wada, Takaya ; Koshino, Masayoshi ; Okada, Takekazu
Author_Institution :
Product Dev. Dept. 1, Murata Manuf. Co., Ltd., Nagaokakyo, Japan
Abstract :
Design equations for a low loss lumped element isolator operating in weak magnetic field below resonance are derived by analyzing the equivalent circuit. The equation of the insertion loss of the isolator is derived by using the perturbation theory, which shows decreasing of the insertion loss by optimizing the coupling factor between two inductors. Actually, it is confirmed by the circuit simulation using admittance matrix. Using these design equations, a small sized 0.5X1.6X0.4mm3 Core-Isolator for cellular phone handset is realized, and the insertion loss of 0.7dB max. and the isolation 23dB min. have been obtained at 2.57GHz to 2.62GHz.
Keywords :
cellular radio; circuit simulation; equivalent circuits; ferromagnetic resonance; inductors; lumped parameter networks; magnetic field effects; microwave isolators; perturbation theory; admittance matrix; bandwidth 2.57 GHz; bandwidth 2.62 GHz; cellular phone handset; circuit simulation; core-isolator; coupling factor; design equations; equivalent circuit; ferromagnetic resonance; inductors; insertion loss; magnetic field; miniaturized lumped element isolator; perturbation theory; Couplings; Insertion loss; Isolators; Magnetic cores; Magnetic fields; Magnetic resonance; Mathematical model; circuit analysis; coupling circuits; ferrites; isolators; microwave devices;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
Conference_Location :
Melbourne, VIC
Print_ISBN :
978-1-4577-2034-5
