ACTUAL GAIN OF CPW-FED ACTIVE INTEGRATED ANTENNAS FOR TELEVISION RECEIVER

Two types of CPW-fed active antenna for television receivers, printed on thin dielectric film, are analyzed numerically and experimentally a nd their broadband operations are reported. The actual gain of the rec eiving active antenna is expressed in terms of the transducer power ga in of the amplifier circuit and the effective length of the passive an tenna. Between the feed point of the passive antenna element and the C PW, the silicon transistor 2SC2585 or 2SC3604 is integrated with a dip ole antenna or loop antenna. The actual gains of a dipole antenna with 24 cm length are more than 8 dBd (relative gain to the standard half- wave dipole) at frequencies from 470 to 770 MHz for television channel s 13-62 in Japan. In the case of a loop antenna with a size of 25.8 cm x 12 cm, actual gains of more than 3.5 dBd are obtained for channels 1-12, from 90 to 222 MHz, and more than 6.5 dBd for channels 13-62, fr om 470 to 770 MHz.