A Miniature Isolator for 800 MHz Band Mobile Communication Systems

Youhei ISHIKAWA; Takekazu OKADA; Takashi KAWANAMI; Keiji OKAMURA; Toshio NISHIKAWA

A Miniature Isolator for 800 MHz Band Mobile Communication Systems

Youhei ISHIKAWA, Takekazu OKADA, Takashi KAWANAMI, Keiji OKAMURA, Toshio NISHIKAWA

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A surface mount device (S. M. D.) type miniature isolator has been developed. Its dimension is 6.8 6.9 4 mm³ and weight is 0.75 g. Both the volume and weight have been reduced to one-third compared with a conventional small model. A resin case and metalplated terminals on its surface are used to realize this configuration. By using a simplified simulation technique the most suitable ferrite size and the most suitable magnet are determined to minimize an insertion loss and to realize good temperature stability. Consequently, 0.8 dB insertion loss, 15 dB isolation and 14 dB return loss are obtained within 3 % bandwidth at 836.5 MHz in the practical operating temperature range between -25 and +75. Handling power capability of 2.5 W for forward input and 0.75 W for reverse input are achieved at +25.

Publication: IEICE TRANSACTIONS on Electronics Vol.E74-C No.5 pp.1226-1232

Publication Date: 1991/05/25

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Type of Manuscript: Special Section PAPER (Special Issue on the 3rd Asia-Pacific Microwave Conference)

Category: Passive Components

Authors

Youhei ISHIKAWA
Takekazu OKADA
Takashi KAWANAMI
Keiji OKAMURA
Toshio NISHIKAWA

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Youhei ISHIKAWA, Takekazu OKADA, Takashi KAWANAMI, Keiji OKAMURA, Toshio NISHIKAWA, "A Miniature Isolator for 800 MHz Band Mobile Communication Systems" in IEICE TRANSACTIONS on Electronics, vol. E74-C, no. 5, pp. 1226-1232, May 1991, doi: .
Abstract: A surface mount device (S. M. D.) type miniature isolator has been developed. Its dimension is 6.8 6.9 4 mm³ and weight is 0.75 g. Both the volume and weight have been reduced to one-third compared with a conventional small model. A resin case and metalplated terminals on its surface are used to realize this configuration. By using a simplified simulation technique the most suitable ferrite size and the most suitable magnet are determined to minimize an insertion loss and to realize good temperature stability. Consequently, 0.8 dB insertion loss, 15 dB isolation and 14 dB return loss are obtained within 3 % bandwidth at 836.5 MHz in the practical operating temperature range between -25 and +75. Handling power capability of 2.5 W for forward input and 0.75 W for reverse input are achieved at +25.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/e74-c_5_1226/_p

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@ARTICLE{e74-c_5_1226,
author={Youhei ISHIKAWA, Takekazu OKADA, Takashi KAWANAMI, Keiji OKAMURA, Toshio NISHIKAWA, },
journal={IEICE TRANSACTIONS on Electronics},
title={A Miniature Isolator for 800 MHz Band Mobile Communication Systems},
year={1991},
volume={E74-C},
number={5},
pages={1226-1232},
abstract={A surface mount device (S. M. D.) type miniature isolator has been developed. Its dimension is 6.8 6.9 4 mm³ and weight is 0.75 g. Both the volume and weight have been reduced to one-third compared with a conventional small model. A resin case and metalplated terminals on its surface are used to realize this configuration. By using a simplified simulation technique the most suitable ferrite size and the most suitable magnet are determined to minimize an insertion loss and to realize good temperature stability. Consequently, 0.8 dB insertion loss, 15 dB isolation and 14 dB return loss are obtained within 3 % bandwidth at 836.5 MHz in the practical operating temperature range between -25 and +75. Handling power capability of 2.5 W for forward input and 0.75 W for reverse input are achieved at +25.},
keywords={},
doi={},
ISSN={},
month={May},}

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TY - JOUR
TI - A Miniature Isolator for 800 MHz Band Mobile Communication Systems
T2 - IEICE TRANSACTIONS on Electronics
SP - 1226
EP - 1232
AU - Youhei ISHIKAWA
AU - Takekazu OKADA
AU - Takashi KAWANAMI
AU - Keiji OKAMURA
AU - Toshio NISHIKAWA
PY - 1991
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E74-C
IS - 5
JA - IEICE TRANSACTIONS on Electronics
Y1 - May 1991
AB - A surface mount device (S. M. D.) type miniature isolator has been developed. Its dimension is 6.8 6.9 4 mm³ and weight is 0.75 g. Both the volume and weight have been reduced to one-third compared with a conventional small model. A resin case and metalplated terminals on its surface are used to realize this configuration. By using a simplified simulation technique the most suitable ferrite size and the most suitable magnet are determined to minimize an insertion loss and to realize good temperature stability. Consequently, 0.8 dB insertion loss, 15 dB isolation and 14 dB return loss are obtained within 3 % bandwidth at 836.5 MHz in the practical operating temperature range between -25 and +75. Handling power capability of 2.5 W for forward input and 0.75 W for reverse input are achieved at +25.
ER -