Communications: radio wave antennas – Antennas – With vehicle
Patent
1976-03-22
1978-04-25
Lieberman, Eli
Communications: radio wave antennas
Antennas
With vehicle
343749, H01Q 132, H01Q 918
Patent
active
040865967
ABSTRACT:
There is disclosed an antenna including an accurately formed whip member and an accurately formed loading coil one end of which is connected to one end of the whip member and the other end of which is connected to a single connector. The length of the whip member and its diameter and any associated metallic connector are selected to give a predeterminedly accurate capacitive value. The loading coil has a predeterminedly accurate inductive value such that the loading coil and whip member have a net accurate inductive value which is connected to a predeterminedly accurate capacitor for matching the impedance of the antenna to the conductor, coaxial cable for example, from the transmitter. The capacitor, a single stub connector, the end of the coaxial cable and the necessary connections are epoxy encapsulated in a base housing.
The connector at the end of the loading coil is attached to the single stub connector in the base to provide the only connection necessary for the antenna to become operative.
The loading coil is very accurately formed by a two-step molding process wherein the turns are first held in position by a first molding step followed by a second overmolding step which connects and holds the associated parts together. The overall accuracy thus obtained is such that no adjustments in the factory after assembly, nor in the field are necessary and the voltage standing wave ratio of the antenna throughout the operating frequency band (Citizens Band) is no greater than two to one.
REFERENCES:
patent: 2841789 (1958-07-01), Bassett
patent: 3267476 (1966-08-01), Finke
patent: 3461455 (1969-08-01), Rowe
patent: 3828353 (1974-08-01), Majkrzak et al.
Gauss Robert C.
Sathe Hemant T.
Wills Lynn D.
Gillman James W.
Lieberman Eli
Motorola Inc.
Myer Victor
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