Mobile communication device and high-frequency composite unit used in the same

• US 20010027119A1
• Filed: 03/08/2001
• Published: 10/04/2001
• Est. Priority Date: 03/23/2000
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Harada, Tetsuro, Uejima, Takanori, Furutani, Koji, Nakajima, Norio, Takada, Yoshiki
• Granted Patent: US 6,928,298 B2
• Time in Patent Office: Days
• US Class Current: 455/553.1
• CPC Class Codes: H03H 7/463 Duplexers
• CPC Class Codes: H04B 1/0053 with common antenna for more than one band
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04B 1/52 Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

Abstract

A mobile communication device, preferably in the form of a dual-band cellular phone, includes two communications systems supporting different frequency bands, such as DCS in the 1.8 GHz band and GSM in the 900 MHz band. The mobile communication device includes an antenna, a high-frequency composite unit, DCS and GSM transmitters, and DCS and GSM receivers. The high-frequency composite unit contains a diplexer, DCS and GSM high-frequency switches, DCS and GSM high-frequency filters or notch filters, and a directional coupler.

Claims

1. A mobile communication device having a plurality of communication systems supporting different frequency bands, comprising:

an antenna;

a transmitter for each of the plurality of communication systems;

a receiver for each of the plurality of communication systems;

a diplexer transmitting transmission signals from the plurality of communication systems to said antenna, and distributing reception signals received via said antenna to the plurality of communication systems;

a high-frequency switch for each of the plurality of communication systems, arranged to switch the signals between said transmitter and said receiver; and

a directional coupler extracting portions of the transmission signals, and sending the results to an automatic gain control circuit, said directional coupler being disposed between said antenna and said diplexer.

2. A high-frequency composite unit used in a mobile communication device according to

claim 1

, said high-frequency composite unit including a microwave circuit carrying the plurality of communication systems, wherein said high-frequency composite unit is defined by a multilayer substrate including a laminated body including a plurality of dielectric layers, the multilayer substrate having said diplexer, said high-frequency switches, and said directional coupler.

3. A high-frequency composite unit according to

claim 2

, wherein said diplexer includes an inductance element and a capacitance element, said high-frequency switch includes a switching element, an inductance element, and a capacitance element, and said directional coupler includes a primary line and a secondary line, the multilayer substrate includes the switching element, the inductance element, the capacitance element, the primary line, and the secondary line, and the multilayer substrate includes a connector connecting the switching element, the inductance element, the capacitance element, the primary line, and the secondary line.

4. A mobile communication device according to

claim 1

, further comprising high-frequency filters, said high-frequency filters being arranged subsequent to said high-frequency switches and being connected to said receivers.

5. A high-frequency composite unit used in a mobile communication device according to

claim 4

, said high-frequency composite unit including a microwave circuit carrying the plurality of communication systems, wherein said high-frequency composite unit includes a multilayer substrate having a laminated body defined by a plurality of dielectric layers, the multilayer substrate having said diplexer, said high-frequency switches, and said directional coupler.

6. A high-frequency composite unit according to

claim 5

, wherein said diplexer includes an inductance element and a capacitance element, said high-frequency switch includes a switching element, an inductance element, and a capacitance element, and said directional coupler includes a primary line and a secondary line, the multilayer substrate includes the switching element, the inductance element, the capacitance element, the primary line, and the secondary line, andthe multilayer substrate further includes a connector connecting the switching element, the inductance element, the capacitance element, the primary line, and the secondary line.

7. A mobile communication device according to

claim 1

, wherein said plurality of communication systems include DCS and GSM systems.

8. A mobile communication device according to

claim 1

, wherein a notch filter is provided between said transmitters and said high-frequency switches.

9. A mobile communication device according to

claim 1

, wherein said directional coupler includes a port.

10. A mobile communication device according to

claim 1

, wherein said diplexer includes inductance elements and capacitors.

11. A dual-band cellular phone device having two communication systems supporting different frequency bands, comprising:

an antenna;

a transmitter for each of the two communication systems;

a receiver for each of the two communication systems;

a diplexer transmitting transmission signals from the two communication systems to said antenna, and distributing reception signals received via said antenna to the two communication systems;

a high-frequency switch for each of the two communication systems, arranged to switch the signals between said transmitter and said receiver; and

a directional coupler extracting portions of the transmission signals, and sending the results to an automatic gain control circuit, said directional coupler being disposed between said antenna and said diplexer.

12. A high-frequency composite unit used in a dual-band cellular phone device according to

claim 11

, said high-frequency composite unit including a microwave circuit carrying the two communication systems, wherein said high-frequency composite unit is defined by a multilayer substrate including a laminated body having a plurality of dielectric layers, the multilayer substrate having said diplexer, said high-frequency switches, and said directional coupler.

13. A high-frequency composite unit according to

claim 12

, wherein said diplexer includes an inductance element and a capacitance element, said high-frequency switch includes a switching element, an inductance element, and a capacitance element, and said directional coupler includes a primary line and a secondary line, the multilayer substrate includes the switching element, the inductance element, the capacitance element, the primary line, and the secondary line, and the multilayer substrate further includes a connector connecting the switching element, the inductance element, the capacitance element, the primary line, and the secondary line.

14. A dual-band cellular phone device according to

claim 11

, further comprising high-frequency filters, said high-frequency filters being arranged subsequent to said high-frequency switches and being connected to said receivers.

15. A high-frequency composite unit used in a dual-band cellular phone device according to

claim 14

, said high-frequency composite unit including a microwave circuit carrying the two communication systems, wherein said high-frequency composite unit includes a multilayer substrate having a laminated body defined by a plurality of dielectric layers, the multilayer substrate having said diplexer, said high-frequency switches, and said directional coupler.

16. A high-frequency composite unit according to

claim 15

, wherein said diplexer includes an inductance element and a capacitance element, said high-frequency switch includes a switching element, an inductance element, and a capacitance element, and said directional coupler includes a primary line and a secondary line, the multilayer substrate includes the switching element, the inductance element, the capacitance element, the primary line, and the secondary line, and the multilayer substrate further includes a connector connecting the switching element, the inductance element, the capacitance element, the primary line, and the secondary line.

17. A dual-band cellular phone device according to

claim 11

, wherein said two communication systems include DCS and GSM systems.

18. A dual-band cellular phone device according to

claim 11

, wherein a notch filter is provided between said transmitters and said high-frequency switches.

19. A dual-band cellular phone device according to

claim 11

, wherein said directional coupler includes a port.

20. A dual-band cellular phone device according to

claim 11

, wherein said diplexer includes inductance elements and capacitors.