US 2161707 A
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June 6, 1939. J. L. HATHAWAY ANTENNA Original Filed Feb. 25, 1937 11/ [III IIIIIII II INVENTOR J. L. HATHAWAY BY g ATTORNEY Patented June 6, 1939 UNITED STATES PATENT OFFICE ANTENNA tion of Delaware Original application February 25, 1937, Serial No.
127,628. Divided and this application November 10, 1937, Serial No. 173,790
My present invention is a division of my copending application Serial No. 127,628, filed February 25, 1937.
The object of my present invention is to pro- 6 vide an improved antenna system for use with ultra short wave apparatus.
The antenna of my present invention is particularly adapted to safeguard the frequency stability and constancy of an ultra short wave transmitter. In carrying my invention into effect, the antenna structure is electrically coupled to the high frequency tubes of the apparatus so that undue loading, for example, by contact therewith will not cause cessation of oscillation or undesirable changes in frequency. A further feature of my antenna resides in the provision of a novel flexible antenna support saving the antenna and apparatus associated therewith from harm in the event of contact with external objects.
In the accompanying drawing, Figure 1 shows my improved antenna and its application to a short wave portable transmitter; and Figure 2 is an exploded view of my antenna.
Figure 1 shows my improved antenna connected to and energized by a high frequency transmitter T. The transmitting structure is supported within a metallic case 92 which is preferably of such size and shape that it may readily be carried about. Passing through an aperture in the top of case 92 is a feed through insulator 96 and my improved antenna I is supported on the insulator through the medium of a supporting spring 98. The spring resiliently supports the antenna so that if the antenna is inadvertently struck or brushed against non-yielding objects it will deflect harmlessly and not be bent or broken. Spring 9-8 also serves to conduct radio frequency energy from the output of the transmitter T to the antenna I00.
40 The power oscillator tube 90 forming a part of transmitter T feeds its output through a relatively small condenser 94 say, for example, of the order of ten micro-microfarads in value to the antenna I00 which may be approximately one- 45 sixteenth of a wave length in length.
Should antenna I00 be touched or otherwise loaded, condenser 04 will serve to prevent undue load reaction or cessation of oscillations and, of
course, the crystal control which may be used with oscillator tube will serve to prevent any substantial change in frequency.
An exploded view of the mechanical construction of the antenna is given in Figure 2. The antenna proper in the form of a stiff wire or rod I00 is fitted within a chuck consisting of a split threaded portion or bolt section I00 whose split ends are fixed against the antenna I00 by the action of the knurled nut I02. The bolt section I00 is mounted upon the coil spring 98, in turn supported by the insulating bushing 96. Bushing 96 is provided with a lower section I04 threaded to which is bolt I06 extending through bushing 96 and threadedly engaging lock nuts I06, I08 and the internally threaded member 1 I 0 upon which the spring 90 is supported.
Having thus described my invention, what I claim is:
1. A short wave antenna system comprising a support, an insulator carried by said support, an open helical spring having one end mounted on said insulator and a short straight light weight antenna rod mounted on the other end of said spring.
2. A short wave antenna system comprising a support, an insulator carried by said support, an open helical spring having one end mounted on said insulator and a short straight light weight antenna rod removably mounted on the other end of said spring.
3. A short wave antenna system comprising a support, an insulator carried by said support, an open helical spring having one end mounted on said insulator, a split chuck mounted on the other end of said spring and a short light weight antenna rod removably mounted in said chuck.
4. A short wave antenna system comprising a support, a feed-through insulator carried by said support, a clamping bolt passing through said insulator and means for energizing said antenna connected to one end of said bolt, a helical spring having spaced turns mounted on the end of said bolt, a split chuck mounted on the other end of said spring remote from said bolt and a light weight antenna rod removably mounted in said chuck.
JARRETT L. HATHAWAY.