×

Homotropic antenna system for portable radio

  • US 4,584,709 A
  • Filed: 07/06/1983
  • Issued: 04/22/1986
  • Est. Priority Date: 07/06/1983
  • Status: Expired due to Term
First Claim
Patent Images

1. A homotropic antenna system for use in a portable receiver having a non-conductive housing which encloses the antenna system comprising:

  • a first antenna means optimized for reception in free space;

    a second multiwire antenna means optimized for reception in close proximity to a human body;

    receiver means having an output for receiving an RF signal;

    a plurality of electronic switch means, each coupled between a corresponding antenna means and said receiver means for selective actuation of corresponding antenna means in response to a control signal;

    a signal evaluation means coupled to the output of said receiver means for providing an output signal indicating the relative signal quality of the output signal of said receiver means; and

    control circuit means coupled to the output of said signal evaluation means for generating a control signal in response to the output signal of said signal evaluation means, said control circuit alternately activating said first or second antenna means if the presently connected antenna means produces a signal of unacceptable quality.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×