Title :
A new balanced-unbalanced type RF-band SAW filter
Author :
Taguchi, Y. ; Seki, S.-I. ; Onishi, K. ; Eda, K.
Author_Institution :
Device Eng. Dev. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
Abstract :
A new balanced-unbalanced type RF-band (950 MHz) surface acoustic wave (SAW) filter for use in portable telephones is presented. This SAW filter has unbalanced input and balanced output terminals. Balanced-unbalanced type SAW filters having a pass-band at 950 MHz were fabricated. The obtained results showed excellent characteristics such as low insertion loss, wide bandwidth, and small VSWR. Using the SAW filter, one can realize balanced-type RF circuits in portable telephones.
Keywords :
UHF filters; acoustic microwave devices; baluns; band-pass filters; land mobile radio; surface acoustic wave resonator filters; 3 dB; 30 MHz; 950 MHz; LiNbO/sub 3/; VSWR; Y-cut X-propagation LiNbO/sub 3/ substrate; balanced output terminals; balanced-type RF circuits; balanced-unbalanced type RF-band SAW filter; inline coupled resonator filters; low insertion loss; pass-band; portable telephones; unbalanced input terminals; wide bandwidth; Circuits; Frequency measurement; Impedance matching; Insertion loss; Radio frequency; Resonator filters; SAW filters; Surface acoustic wave devices; Surface acoustic waves; Telephony;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.508757
