×

Broadband radio transceiver

  • US 5,375,256 A
  • Filed: 09/03/1992
  • Issued: 12/20/1994
  • Est. Priority Date: 09/04/1991
  • Status: Expired due to Fees
First Claim
Patent Images

1. A radio transceiver comprising:

  • transmitting means for supplying a transmitting signal having a transmitting frequency to an antenna terminal;

    receiving means for receiving a receiving signal from said antenna terminal having a receiving frequency different from said transmitting frequency of said transmitting signal;

    housing means for housing said transmitting means, said receiving means and said antenna terminal;

    a rod-shaped antenna extendably housed in said housing means and having an antenna element extendable up to a length corresponding to substantially a half of a wavelength corresponding to an intermediate frequency between the frequencies of said transmitting and receiving signals; and

    impedance matching means connected between said antenna terminal and a feed point of said antenna for matching the impedances of said transmitting means and said receiving means as seen from said antenna terminal with an antenna impedance of said antenna as seen from said feed point;

    said impedance matching means comprising;

    an impedance conversion circuit including a first inductor inserted between said antenna terminal and said feed point; and

    a first capacitor inserted between said feed point and a ground potential; and

    a parallel resonance circuit including a parallel circuit of a second inductor and a second capacitor inserted between said antenna terminal and said ground potential and resonating at a predetermined frequency range surrounding said intermediate frequency.

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