| US 7,499,678 B2 | ||
| Antenna sharing device and wireless communication terminal using the same | ||
| Nobuhiko Shibagaki, Kokubunji (Japan); Mitsutaka Hikita, Hachioji (Japan); Kazuyuki Sakiyama, Chigasaki (Japan); and Osamu Hikino, Yokohama (Japan) | ||
| Assigned to Hitachi Media Electronics Co., Ltd., Iwate-Ken (Japan) | ||
| Filed on Dec. 19, 2005, as Appl. No. 11/303,924. | ||
| Claims priority of application No. 2004-377250 (JP), filed on Dec. 27, 2004. | ||
| Prior Publication US 2006/0141944 A1, Jun. 29, 2006 | ||
| Int. Cl. H04B 1/46 (2006.01) | ||
| U.S. Cl. 455—82 [455/129; 455/67.11; 455/78; 370/342; 333/134] | 19 Claims |
| 1. An antenna sharing device which has a diplexer and which switches paths for signals in a plurality of frequency bands,
wherein said diplexer comprising:
at least a common signal terminal which is connected to an antenna and which transmits and receives signals in said plurality
of frequency bands;
a high-pass filter; and
units for distributively outputting signals in each frequency band selected from said receive signals and for combining and
outputting transmit signals to said signal terminal;
wherein said antenna sharing device further comprising:
a first high-frequency switch which is connected to said high-pass filter and which separates the transmit and receive signals
in said plurality of frequency bands; and
a second high-frequency switch which is connected to a first output terminal of said first high-frequency switch and which
separates said transmit signal and the receive signal in a frequency band separated from said plurality of frequency bands;
wherein said first high-frequency switch includes compound semiconductors and said second high-frequency switch connected
to said first output terminal includes PIN diodes.
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