High-frequency switch module

• US 6,987,984 B1
• Filed: 03/17/2000
• Issued: 01/17/2006
• Est. Priority Date: 03/18/1999
• Status: Expired due to Term

• Current Assignee: Hitachi Metals (Thailand) Ltd.
• Original Assignee: Hitachi Metals (Thailand) Ltd.
• Inventors: Tanaka, Toshihiko, Watanabe, Mitsuhiro, Kemmochi, Shigeru, Tai, Hiroyuki, Taketa, Tsuyoshi
• Primary Examiner(s): Nguyen, Lee
• Assistant Examiner(s): Tran, Tuan A
• Application Number:
  US09/700,671
• Time in Patent Office: 2,132 Days
• Field of Search: 455/550.1, 455/552.1, 455/553.1, 455/73, 455 78- 83, 333100-104, 333/134, 333/175
• US Class Current: 455/552.1
• CPC Class Codes: H01P 1/15 by semiconductor devices
• CPC Class Codes: H01P 1/2135 using strip line filters H01P1/2131 takes precedence
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band
• CPC Class Codes: H04B 1/44 Transmit/receive switching
• 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 high-frequency switch module comprising one band-separating circuit and two switch circuits, the first switch circuit being connected to one circuit separated by the band-separating circuit, and the second switch circuit being connected to the other circuit thereof; the first switch circuit being a circuit for switching a transmission system and a reception system for a first transmitting and receiving system; and the second switch circuit being a circuit for switching a transmission system and a reception system for a second transmitting and receiving system and a transmission system and a reception system for a third transmitting and receiving system.

Claims

1. A high-frequency switch module for switching a transmission circuit and a reception circuit in a plurality of different transmitting and receiving systems, comprising first and second filter circuits having different pass bands;

a first switch circuit connected to said first filter circuit for switching a transmission circuit and a reception circuit in a first transmitting and receiving system; and

a second switch circuit connected to said second filter circuit for switching a transmission circuit of second and third transmitting and receiving systems, a reception circuit of said second transmitting and receiving system and a reception circuit of said third transmitting and receiving system.

2. The high-frequency switch module according to claim 1, wherein said first and second filter circuits function as branching filter circuits for dividing a reception signal for said first transmitting and receiving system and a reception signal for said second and third transmitting and receiving systems.

3. The high-frequency switch module according to claim 1, wherein each of said first and second switch circuits is a diode switch comprising a diode and a distributed constant line as main elements, whereby one of said first, second and third transmitting and receiving systems is selected by controlling the on/off of said diode switches by applying voltage from a power supply means to said diode switches.

4. The high-frequency switch module according to claim 3, wherein said second switch circuit comprises an input/output terminal for inputting a reception signal for said second and third transmitting and receiving systems from said second filter circuit and outputting a transmission signal from said transmission circuit of said second and third transmitting and receiving systems;

an input terminal for inputting a transmission signal from said transmission circuit of said second and third transmitting and receiving systems;

a first output terminal for outputting a reception signal of said second transmitting and receiving system to said reception circuit; and

a second output terminal for outputting a reception signal of said third transmitting and receiving system to said reception circuit;

a first diode connected between said input/output terminal and said input terminal;

a first distributed constant line connected between said input terminal and a ground;

a second distributed constant line connected between said input/output terminal and said first output terminal;

a second diode connected between said first output terminal and said ground; and

a third diode connected between said input/output terminal and said second output terminal.

5. The high-frequency switch module according to claim 4, wherein each of said first and second distributed constant lines has a line length in which a resonance frequency thereof is within a range between the maximum frequency and the minimum frequency in a frequency band of said transmission signal for said second and third transmitting and receiving systems.

6. The high-frequency switch module according to claim 3, wherein said second switch circuit comprises an input/output terminal for inputting a reception signal for said second and third transmitting and receiving systems from said second filter circuit and outputting a transmission signal from said transmission circuit of said second and third transmitting and receiving systems;

an input terminal for inputting a transmission signal from said transmission circuit of said second and third transmitting and receiving systems;

a third output terminal for outputting a reception signal of said second and third transmitting and receiving systems; and

a fourth output terminal for outputting a reception signal of said second transmitting and receiving a system to said reception circuit;

a fifth output terminal for outputting a reception signal of said third transmitting and receiving system to said reception circuit;

a first diode connected between said input/output terminal and said input terminal;

a first distributed constant line connected between said input terminal and a ground;

a second distributed constant line connected between said input/output terminal and said third output terminal;

a second diode connected between said third output terminal and said ground;

a third distributed constant line connected between said third output terminal and said fourth output terminal;

a third diode connected between said fourth output terminal and said ground, a fourth diode connected between said third output terminal and said fifth output terminal; and

a fourth distributed constant line connected between said fifth output terminal and said ground.

7. The high-frequency switch module according to claim 6, wherein said first distributed constant line has a line length in which a resonance frequency thereof is within a range between the maximum frequency and the minimum frequency in a frequency band of said transmission signal for said second and third transmitting and receiving systems;

wherein said second distributed constant line has a line length in which a resonance frequency thereof is within a range between the maximum frequency and the minimum frequency in a frequency band of said transmission signal for aid second and third transmitting and receiving systems;

wherein said third distributed constant line has a line length in which a resonance frequency thereof is within a range between the maximum frequency and the minimum frequency in a frequency band of said reception signal for said third transmitting and receiving system; and

wherein said fourth distributed constant line has a line length in which a resonance frequency thereof is within a range between the maximum frequency and the minimum frequency in a frequency band of said reception signal for said third transmitting and receiving system.

8. The high-frequency switch module according to claim 1, wherein a low-pass filter comprising a distributed constant line and a capacitor is connected between said second filter circuit and said transmission circuit for said second and third transmitting and receiving systems.

9. The high-frequency switch module according to claim 8, wherein the line length of said distributed constant line constituting said low-pass filter is λ

/8 to λ

/12, wherein λ

is a middle frequency of said transmission signal for said second and third transmitting and receiving systems.

10. The high-frequency switch module according to claim 1, wherein each of said first and second filter circuits comprises a distributed constant line and a capacitor.

11. The high-frequency switch module according to claim 10, wherein at least part of said distributed constant lines and a said capacitors in said first and second filter circuits and said distributed constant lines in said first and second switch circuits is constituted by electrode patterns in a laminate comprising dielectric layers having electrode patterns, said diodes in said first and second switch circuits being disposed on said laminate.

12. The high-frequency switch module according to claim 11, wherein a low-pass filter circuit comprising a distributed constant line and a capacitor is connected between said second filter circuit and said transmission circuit for said second and third transmitting and receiving systems;

and wherein at least part of said distributed constant line and said capacitors is constituted by electrode patterns in said laminate.

13. The high-frequency switch module according to claim 11, wherein said distributed constant line in said switch circuit is formed by electrode patterns formed in a region sandwiched by a pair of ground electrodes.

14. The high-frequency switch module according to claim 13, wherein capacitors in said first and second filter circuits are formed on a pair of ground electrodes, and distributed constant lines in said first and second filter circuits are formed thereon.

15. A high-frequency switch module for switching a transmission circuit and a reception circuit in a plurality of different transmitting and receiving systems, comprising first and second filter circuits having different pass bands;

a first switch circuit connected to said first filter circuit for switching a transmission circuit and a reception circuit in a first transmitting and receiving system;

a second switch circuit connected to said second filter circuit for switching a transmission circuit of second and third transmitting and receiving systems, a reception circuit of said second transmitting and receiving system and a reception circuit of said third transmitting and receiving system; and

a low-pass filter connected between said second filter circuit and said transmission circuit for said second and third transmitting and receiving systems, wherein said low-pass filter and each of said first and second filter circuits comprises a distributed constant line and a capacitor, and at least part of said distributed constant line and said capacitors is constituted by electrode patterns in said laminate, wherein at least part of said distributed constant lines and said capacitors in said first and second filter circuits and said distributed constant lines in said first and second switch circuits is constituted by electrode patterns in a laminate comprising dielectric layers having electrode patterns formed in a region sandwiched by a pair of ground electrodes, said diodes in said first and second switch circuits being disposed on said laminate, and wherein capacitors in said low-pass filter circuit and capacitors in said first and second filter circuits are formed on said ground electrodes; and

wherein a distributed constant line in said low-pass filter circuit and distributed constant lines in said first and second filter circuits are formed thereon.

16. A high-frequency switch module for switching a transmission circuit and a reception circuit in a plurality of different transmitting and receiving systems, comprising first and second filter circuits having different pass bands;

a first switch circuit connected to said first filter circuit for switching a transmission circuit and a reception circuit in a first transmitting and receiving system;

a second switch circuit connected to said second filter circuit for switching a transmission circuit of second and third transmitting and receiving systems, a reception circuit of said second transmitting and receiving system and a reception circuit of said third transmitting and receiving system; and

a low-pass filter connected between said second filter circuit and said transmission circuit for said second and third transmitting and receiving systems, wherein said low-Pass filter and each of said first and second filter circuits comprises a distributed constant line and a capacitor, and at least part of said distributed constant line and said capacitors is constituted by electrode patterns in said laminate and wherein said first and second filter circuits and said low-pass filter circuit are formed in separate regions not overlapping in a laminating direction of said laminate.