Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1984-08-08
1986-12-02
Lieberman, Eli
Communications: radio wave antennas
Antennas
With radio cabinet
343790, 343895, H01Q 124
Patent
active
046268626
ABSTRACT:
An elongated active element for an antenna has an internal resonator providing a high quality matching impedance. The internal resonator is formed by a pair of conductors including an outer conductor and a coaxial inner conductor that is connected to signal ground. The signal connection of the active element is made to one end of the outer conductor in the neighborhood of the ground connection to the inner conductor. The inner conductor is shorted to the outer conductor at approximately a quarter of a wavelength, plus an integral number of half wavelengths, from the signal and ground connections to provide a parallel-resonant condition complementing the series resonant characteristics of the radiation impedance of the active element. Preferably, the active element is approximately a quarter wavelength long, and may be lengthened or shortened to obtain a desired radiation resistance. The antenna is easily fabricated from a length of coaxial cable. The antenna is advantageously used in pagers and other kinds of VHF and UHF radios, since the coaxial cable can be coiled to fit inside a miniature radio housing. For relatively low frequencies, a coil of coaxial cable including a number of turns provides a relatively efficient broadband antenna.
REFERENCES:
patent: 676332 (1901-06-01), Marconi
patent: 2529213 (1950-11-01), Goldsmith
patent: 2533078 (1950-12-01), Woodward
patent: 3573628 (1971-04-01), Cramer, Jr. et al.
patent: 3622890 (1971-11-01), Fujimoto et al.
patent: 3623161 (1971-11-01), Fujimoto et al.
patent: 3736591 (1973-05-01), Rennels et al.
patent: 3774218 (1973-11-01), Fowler
patent: 3863157 (1975-01-01), Quinlan et al.
patent: 4103241 (1978-07-01), Najork
patent: 4254422 (1981-03-01), Kloepfer et al.
patent: 4270128 (1981-05-01), Drewett
patent: 4543583 (1985-09-01), Wurdack
Jasik, Antenna Engineering Handbook, 1st ed., McGraw-Hill Book Co., New York (1961) pp. 22-28.
Radio Amateur's Handbook, American Radio Relay League, Newington, Conn. (1969) pp. 369-381.
Brown et al., Lines, Waves, and Antennas, 2nd ed., Ronald Press Co. New York (1973) pp. 80, 150, 344-345.
LandOfFree
Antenna having coaxial driven element with grounded center condu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Antenna having coaxial driven element with grounded center condu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antenna having coaxial driven element with grounded center condu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2295845