Antenna duplexer

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United States of America Patent

PATENT NO 8994472
APP PUB NO 20120188026A1
SERIAL NO

13353350

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An antenna duplexer includes first and second filters connected to an antenna terminal. The first filter has a passband of a low frequency band. The second filter has a passband of a high frequency band. The second filter is a ladder-type filter including series-arm resonators and parallel-arm resonators. At least one parallel-arm resonator out of the parallel-arm resonators has a main resonance and an auxiliary resonance. Attenuation poles caused by the main resonance and the auxiliary resonance are within the low frequency band. This antenna duplexer has a high attenuation characteristic and a high isolation characteristic while maintaining a low insertion loss.

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Patent Owner(s)

  • SKYWORKS FILTER SOLUTIONS JAPAN CO., LTD.

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiwara, Joji Osaka, JP 57 676
Nakamura, Hiroyuki Osaka, JP 526 4351
Nishimura, Kazunori Kyoto, JP 64 516
Yamaji, Toru Osaka, JP 29 149

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