Wireless Signal Switching Circuit and Wireless Communication Apparatus

• US 20070213015A1
• Filed: 06/21/2004
• Published: 09/13/2007
• Est. Priority Date: 06/26/2003
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: NGK Spark PLUG Company Limited (Niterra Co., Ltd.), Sony Corporation (Sony Group Corp.)
• Inventors: Yamada, Kazuhiro, Suhara, Akira, Aoyama, Shigeya, Nagano, Hiroaki
• Granted Patent: US 7,522,887 B2
• Time in Patent Office: Days
• US Class Current: 455/83
• CPC Class Codes: H04B 1/005 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04B 1/48 in circuits for connecting transmitter and receiver to a common transmission path, e.g. by energy of transmitter H04B1/46 takes precedence

Abstract

A wireless signal switching circuit for switching a plurality of wireless transmitter signals or a plurality of wireless receiver signals with low loss in a dual mode compatible mobile phone (cellular phone) or other mobile wireless communication apparatus having for example a triple band GSM system as a first communication system and for example a UMTS system as a second communication system is provided. A wireless signal switching circuit 1 has a signal route switch 20 of a F2 or F3 transmission and reception system, a signal route switching circuit 30 of an F1 or UMTS transmission and reception system having a diplexer 31, and a 90 degree phase rotation circuit 40. Note that the relationship of frequencies is F1≦F2<F3. The 90 degree phase rotation circuit 40 has the characteristic that the phase of a signal of F2 or F3 is rotated by 90 degrees when a switch element 44 is set to a closed state, and a high frequency of UMTS is attenuated when the switch element 44 is set to an opening state. The 90 degree phase rotation circuit 40 separates the signal route switch 20 of the F2 or F3 transmission and reception system and the signal route switching circuit 30 of the F1 or UMTS transmission and reception system when using the F2 or F3 transmission and reception system and has a passing characteristic when using the F1 or UMTS transmission and reception system.

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 (F2 or F3) in the first communication system;

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 further different frequency (F1) of the first communication system lower than the plurality of frequencies (F2, F3) in the first communication system explained above and the transmitter and receiver signals of the second 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 a further different frequency (F1) of the first 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.

2. A wireless signal switching circuit as set forth in claim 1, wherein

the phase rotating means has a characteristic of attenuating harmonic components of signals transmitted by the second communication system.

3. A wireless signal switching circuit as set forth in claim 1, wherein

the first filter side of the diplexer (31) is a low frequency filter side, and the second filter side of the diplexer (31) is a high frequency filter side.

4. A wireless signal switching circuit as set forth in claim 1, wherein the phase rotating means is provided with:

an inductor (41) having one end connected to the antenna terminal (11) and 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.

5. A wireless signal switching circuit as set forth in any one of claims 1 to 4, wherein

the first communication system is a triple band GSM system, and

the second communication system is a UMTS system.

6. A wireless signal switching circuit as set forth in claim 5, wherein the first signal route switching means (20) comprises:

a first receiver signal switching circuit connected to the antenna terminal (11) and having a plurality of switch means (23, 24) for selecting receiver signals (F2RX or F3RX) having a plurality of different frequencies (F2 or F3) in the first communication system and

a first transmitter signal switching circuit connected to the antenna terminal (11) and having a switch means (22) for selecting transmitter signals (F2 or F3TX) having a plurality of different frequencies (F2 or F3) in the first communication system and a filter means connected to the switch means.

7. A wireless signal switching circuit as set forth in claim 1, wherein the second signal route switching means (30) has a switch means (32) connected to the first filter side terminal (31b) of the diplexer (31) and selecting a transmitter signal having a further different frequency (F1) of the first communication system and a switch means (33) for selecting a receiver signal having a further different frequency (F1) of the first communication system.

8. A wireless communication apparatus provided with:

a wireless transmitter and receiver antenna (ANT) and

a wireless signal switching circuit as set forth in any one of claims 1 to 4.

9. A wireless communication apparatus as set forth in claim 8, wherein:

the wireless communication apparatus is a mobile wireless communication apparatus including a dual mode compatible mobile phone of a triple band GSM system as the first communication system and a UMTS system as the second communication system.

10. A wireless communication apparatus as set forth in claim 1, wherein:

the second filter side terminal of the diplexer is connected to a front end of a UMTS use transmission and reception circuit, and

the front end has;

a duplexer (561) for switching the UMTS transmitter signal and UMTS receiver signal,

a low noise amplifier circuit (562) for amplifying the UMTS receiver signal input through this duplexer, and

a power amplifier circuit (563) for amplifying the UMTS transmitter signal.

11. A wireless signal switching circuit as set forth in claim 5, wherein the second signal route switching means (30) has a switch means (32) connected to the first filter side terminal (31b) of the diplexer (31) and selecting a transmitter signal having a further different frequency (F1) of the first communication system and a switch means (33) for selecting a receiver signal having a further different frequency (F1) of the first communication system.

12. A wireless signal switching circuit as set forth in claim 6, wherein the second signal route switching means (30) has a switch means (32) connected to the first filter side terminal (31b) of the diplexer (31) and selecting a transmitter signal having a further different frequency (F1) of the first communication system and a switch means (33) for selecting a receiver signal having a further different frequency (F1) of the first communication system.

13. A wireless communication apparatus provided with:

a wireless transmitter and receiver antenna (ANT) and

a wireless signal switching circuit as set forth in any one of claim 5.

14. A wireless communication apparatus provided with:

a wireless transmitter and receiver antenna (ANT) and

a wireless signal switching circuit as set forth in any one of claim 6

15. A wireless communication apparatus provided with:

a wireless transmitter and receiver antenna (ANT) and

a wireless signal switching circuit as set forth in any one of claim 7.

16. A wireless communication apparatus as set forth in claim 5, wherein:

the wireless communication apparatus is a mobile wireless communication apparatus including a dual mode compatible mobile phone of a triple band GSM system as the first communication system and a UMTS system as the second communication system.

17. A wireless communication apparatus as set forth in claim 6, wherein:

the wireless communication apparatus is a mobile wireless communication apparatus including a dual mode compatible mobile phone of a triple band GSM system as the first communication system and a UMTS system as the second communication system.

18. A wireless communication apparatus as set forth in claim 7, wherein:

the wireless communication apparatus is a mobile wireless communication apparatus including a dual mode compatible mobile phone of a triple band GSM system as the first communication system and a UMTS system as the second communication system.