Title:
ANTENNA SWITCH
Document Type and Number:
WIPO Patent Application WO/1997/004533
Kind Code:
A1
Abstract:
An antenna switch which comprises first switch means (11) for selectively connecting a transmission terminal (a) or a reception terminal (c) to a common point (e) in accordance with a control signal, second switch means (12) having a similar construction to that of the first switch means (11), for selectively connecting a first antenna terminal (b) or a second antenna terminal (d) to a common point (f), and a filter (13) interposed between the switch circuits (11 and 12) through capacitances (14 and 15). The circuit construction of the first switch means (11) has the same circuit construction as that of the second switch means (12), and devices constituting them are symmetrically disposed on each wiring layer of a multilayered substrate. Fewer kinds of components are needed and the construction can be simplified. This antenna switch is utilized for switching between transmission and reception and antenna switching of a portable telephone set.
Inventors:
HAYASHI KATUHIKO (JP)
Application Number:
PCT/JP1996/002014
Publication Date:
February 06, 1997
Filing Date:
July 19, 1996
Export Citation:
Assignee:
TDK CORP (JP)
HAYASHI KATUHIKO (JP)
HAYASHI KATUHIKO (JP)
International Classes:
H01P1/15; H03K17/76; H04B1/44; H04B1/48; H05K1/00; H05K1/16; H05K1/18; (IPC1-7): H04B1/44; H01P1/15; H03K17/76
Foreign References:
| JPH0167840U | 1989-05-01 | |||
| JPH06334404A | 1994-12-02 | |||
| JPS57204747U | 1982-12-27 | |||
| JPH06343001A | 1994-12-13 |
Other References:
See also references of EP 0784384A4
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