Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
RADIOCOMMUNICATION EQUIPMENT
Document Type and Number:
Japanese Patent JPH01101702
Kind Code:
A
Abstract:

PURPOSE: To prevent an antenna effect from being lowered even when an antenna is retracted by connecting a loading coil, whose inductance is small, to the antenna when a telescopic antenna is expanded and connecting a loading coil, whose inductance is large, to the antenna when it is retracted.

CONSTITUTION: A telescopic antenna 2 is provided. Then, switches 3a and 3b are provided to connect a loading coil 8, whose inductance is small when the antenna 2 is expanded, to the antenna 2 and to connect a loading coil 9, whose inductance is large when the antenna 2 is retracted, to the antenna. Accordingly, even when the antenna 2 is expanded and retracted, an antenna circuit is oscillated with a transmitting and receiving radio wave. Thus, a radiocommunication equipment, in which there is no extreme difference to the sensitivity of the antenna even when the antenna is expanded and retracted and a high frequency output transistor is not destroyed even when transmission is executed in a condition that the antenna is retracted, can be obtained.


Inventors:
OMAGARI NAOYUKI
Application Number:
JP25892487A
Publication Date:
April 19, 1989
Filing Date:
October 14, 1987
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H01Q9/30; H01Q1/10; H01Q1/24; H01Q1/50; H04B1/40; (IPC1-7): H01Q1/10; H01Q9/30; H04B1/40
Domestic Patent References:
JP61168732B
Attorney, Agent or Firm:
Akira Kobiji (2 outside)



 
Previous Patent: JPH01101701

Next Patent: RADIOCOMMUNICATION EQUIPMENT