Title:
RADIO EQUIPMENT PROVIDED WITH PLURAL ANTENNAS
Document Type and Number:
Japanese Patent JP2581444
Kind Code:
B2
Abstract:
PURPOSE: To prevent interference by other antennas when an antenna is selected in the communication equipment provided with plural antennas.
CONSTITUTION: A switch SW2(SW3) by which a point T1(T2) providing a maximum voltage distribution of a standing wave of each antenna connects to ground is provided to an antenna A1(A2) connected selectively to a transmission/ reception circuit 1 by a changeover switch SW1 and the switch of the antenna not selected is operated to connect a contact of the switch to ground. The impedance of the antenna connecting to ground is largely unbalanced, the mutual interference with the selected antenna is prevented to prevent the other antenna from giving adverse effect onto the selected antenna.
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Inventors:
NORIMATSU HIDEHIKO
Application Number:
JP11167494A
Publication Date:
February 12, 1997
Filing Date:
April 28, 1994
Export Citation:
Assignee:
NIPPON ELECTRIC CO
International Classes:
H01Q21/28; H01Q1/52; H04B1/40; H04B7/08; (IPC1-7): H04B1/40; H01Q21/28
Domestic Patent References:
| JP1067840B | ||||
| JPS5825732A | ||||
| JPH04321326A | ||||
| JPH0461942B2 |
Attorney, Agent or Firm:
Suzuki Akio