| US 7,522,887 B2 | ||
| Wireless signal switching circuit and wireless communication apparatus | ||
| Hiroaki Nagano, Kanagawa (Japan); Akira Suhara, Kanagawa (Japan); Kazuhiro Yamada, Aichi (Japan); and Shigeya Aoyama, Aichi (Japan) | ||
| Assigned to Sony Corporation, (Japan); and NGK Spark Plug Co., Ltd., (Japan) | ||
| Appl. No. 10/561,610 PCT Filed Jun. 21, 2004, PCT No. PCT/JP2004/009055 § 371(c)(1), (2), (4) Date Feb. 01, 2007, PCT Pub. No. WO2005/002078, PCT Pub. Date Jan. 06, 2005. |
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| Claims priority of application No. 2003-182565 (JP), filed on Jun. 26, 2003. | ||
| Prior Publication US 2007/0213015 A1, Sep. 13, 2007 | ||
| Int. Cl. H04B 1/44 (2006.01) | ||
| U.S. Cl. 455—78 [455/62; 455/63.3; 455/82; 455/83; 455/63.1] | 18 Claims |
| 1. A wireless signal switching circuit for switching a plurality of transmitter and receiver signals having different frequencies
in wireless communication for communication by at least a first communication system and a second communication system, comprising:
an antenna terminal (11) connected to an antenna (ANT);
a first signal route switching means (20) having a plurality of switch means (21, 23, 24, 60) for selecting a plurality of transmitter and receiver signals having different frequencies in the first communication system,
the different frequencies including at least a second frequency and a third frequency (F2, F3);
a phase rotating means (40) having one end (40a) connected to the antenna terminal (11) and imparting a phase rotation of 90 degrees to the phase of the signal of the frequency component supplied to the first
signal route switching means (20); and
a second signal route switching means (30) having a diplexer (31) for separating the transmitter and receiver signals having a first frequency (F1) of the second communication system lower than the first and second frequencies (F2, F3) of the first communication system and the transmitter and receiver signals of the first communication system, a common input
and output terminal (31a) of the diplexer (31) being connected to the other end (40b) of the phase rotating means, a first filter side terminal (31b) of the diplexer (31) being supplied with transmitter and receiver signals having the first frequency (F1) of the second communication system, and a second filter side terminal (31c) of the diplexer (31) being supplied with transmitter and receiver signals of the second communication system, and
an inductor (41) being connected between the one end (40a) connected to the antenna terminal (11) and the other end (40b) connected to the diplexer (31) in the second routing means (30), and
wherein the phase rotating means comprises:
the inductor (41) having the other end (40b) connected to the common input and output terminal (31a) of the diplexer (31),
a first capacitor (42) connected between one end of the inductor (41) and a reference potential node,
a second capacitor (43) connected between the other end of the inductor and the reference potential node,
a first switch means (44, 60) having one end connected to the other end of the inductor (41), and
a third capacitor (45) connected between the other end of the first switch means (44, 60) and the reference potential node, and
has the characteristics
that a circuit defined by the inductor (41) and the first to third capacitors (42, 43, 45) imparts a phase rotation of 90 degrees to the phase of the signal of the frequency component supplied to the first signal
route switching means (20) when the first switch means is activated and
that a circuit defined by the inductor (41) and the first and second capacitors (42, 43) attenuates the harmonic component of the signal transmitted by the second communication system when the first switch means
is de-activated.
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