US1878257A

US1878257A - Antenna system

Info

Publication number: US1878257A
Application number: US373804A
Authority: US
Inventors: Thomas R Baker
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-06-26
Filing date: 1929-06-26
Publication date: 1932-09-20
Anticipated expiration: 1949-09-20

Description

sept. 2o, 1932. T. R. BAKER 1,878,257

ANTENNA SYSTEM Filed June 25, 1929 2 Fla INVENTOR. WITNEssEs:

' @MAS EBAKER,

' HIS ATTORNEY.

Patented Sept. 20, 1932 THOMAS n. BAKER, or CHICAGO,

PATENT ori-*ICE ILLINOIS, ASSIGNOR F ONE-HALF TO JAMES E. BAKER, OF CHICAGO, ILLINOIS AN TENNA SYSTEM Application led June 26,

whilereducing static interference.

Additional objects and advantages of the method and construction employed will appear more fullyv in the hereinafter details when taken inconnection with the accompanying'y drawing, in which,

Fig. 1 is a perspective view of an antenna systemoperatively associated kwith radlo receiving apparatus; y,

, Fig. 2 is an enlarged elevational view, with if'. parts broken away, of details employed in the construction of my antenna system;

Fig. 3 is an elevational view taken on line- 3-3 of Fig. 2;

Fig. 4 is an enlarged vertical sectional view, taken substantially-on the line 4-#4 of Fig. 5, of angelement employed for obtainlng an .efficient ground connection for the an-A tenna; y t

Fig. 5 is a top plan view ofthe devlce s; shown in Fig. 4'; and

Fig. 6 is a diagrammatic view of the antenna circuit.

In the drawing wherein similar characters of reference indicate corresponding parts in the preferred form of my invention, 11 and 12 designate standards suitably braced by

guy wires

13, 14. To the

standards

11 and 12 the

boards

15, 16 are secured. As clearly shown in Fig. 2 to each of the

boards

15, 16, a plurality of screw eyes or other suitable fastening elements 17 are secured. Con* nected at one end by the wires 18 to the screw eyes 17 are insulators 19, the other ends of which are inter-connected by longitudinally stretching antenna wires 20, the uppermost 21 of which, as shown in Figs. 1 and 2, is connected at the right side thereof by a wire 22 which leads to and is connected with a metal ground engaging member 23, the latter having a threaded socket accommodating 1929. Serial N0. 373,804.

binding screw 24, the base of the ground engaging member 23 being provided with a plurality of radially extending feet 25. be observed that in the general disposition of the antenna wires 20, the insulators 19, and the connecting wires 18 are secured to the

boards

15, 16 in substantially the same manner both `at the left and right hand sides of the antenna supporting structure. At the left hand side of the plurality of wires 20, and secured to the uppermost 21 thereof, is a depending lead-in wire 26, which latter is directly connectedto a radio receiving, set 27 which in the illustration is located in the interi c r of the structurel A.

As best shown structurally in Figs. 1 and 2, and also in the diagrammatic View of Fig. 6, it will be seen that the. present antenna system may be considered as being divided into 'two components, the first of which comprises the wire 22 leading from the ground to the uppermost wire 21 `and forming with the lead-in wire 26 to the radio receiving set a static drain, the other component comprising the plurality of longitudinally stretching wires 20, six in all, which are arranged in two separate groups B and C as more clearly shown in the diagram in Fig. 6; the rirst of these groups B comprising the three

wires

28, 29, 30; the other group C, including the

wires

31, 32, 33. Group B is interconnected by the

short leads

34, 35, whiler group C is interconnected by the

leads

36, 37. The groups of wires B and C, as more clearly shown in Fig. 6 practically form ak condenser the capacity of which will be a function of the distance between the. individual wires of two groups of wires B and C and the surface area thereof. As shown in Figs. 1 and 2, both groups of wires B and C are connected to the lead-in wire 26 through the respective

short leads

34, 35, and 36, 37, and through said lead-in wire 26 to the radio'receiving set 27 (see Fig. 1), the same connection, in e'ect, with the radio receiving set 27 being illustrated in the diagram in Fig. 6, in that the two groups of wires B and C are shown connected tothe same binding post on the receiving set. It is also noted that the

wires

31, 32, and 33,0f the group C are interconnected at their ends It will y opposite to the ends which are connected by said short leads 36, 3T, while the wires of the group B are interconnected at one end only.

There will be found a tendency when atmospheric conditions or strays are such as to occasion considerable interference with wireless reception by what is termed shock or impact excitation of the circuits of receivinor sets. In the present antenna system the wire 26 and the wire 22, in which latter the resistance 3S may be incorporated, is essentially an aperiodic circuit or a. circuit to which the radio receiving set is only slightly responsive. However, this aperiodic circuit will act as a static drain or in other words serve to directly ground or shunt the static or strays to an extent where the shock e);- citation effect communicated by them while noticeable in the radio receiving set connected thereto by wire 26, is nevertheless considerably attenuated. rI`he second component which comprises the two groups of wires B and C is also coupled to the receiving set and has a connection by wire 39 to the first component. The second antenna component is or may be assumed to be tuned to the oscillation frequency of the carrier wavel transmitted, and while also receiving strays at the same time as the first antenna component will nevertheless be responsive to a greater degree to the modulated carrier waves to which the set is being tuned, than the strays. The capacity effect of the two groups of wire B and C alluded to above also assists in bypassing to some degree static interference, and appreciably lessens the disturbance therefrom during radio reception.

The present system I find in practice to actually attenuate to a considerable degree the effect of strays by the means described and illustrated. I am aware of so-called static elimin ators which employ for that purpose comparatively ecomplicated filter systems employing inductance and capacity units which are intercoupled in the receiving apparatus in an endeavor to balance out the so-called strays or static. interference, but I have found the comparatively simple means herein shown to yield results comparable to those of the far more complicated methods employed at a fraction of their cost. It must be recognized that at best the so-called elimination of static interference is only relative and no system yet devised has succeeded in completely eliminating static interference without also completely eliminating the signal desired to be received. As a means for reducing and lessening the effect of static and strays, the method and means above described and shown will be found of assistance.

While I have herein described with some degree of particularity a preferred form of the invention. it will be understood that some modification and change may be made in the details as set forth Without departing from the spirit of or sacrificing any of the advantages of the invention as defined in the appended claims.

IVhat I claim as new and desire to secure by Letters Patent is:

l. Means for reducing static interference comprising a plurality of wires fastened to a pair of supporting elements arranged in spaced relation, one of said plurality of wires being directly connected to a radio receiving set and constituting an aperiodic circuit, the others of said plurality of wires being divided into two groups, each of the wires of said two groups being arranged in alternate relation to provide a condenser, said condenser being -joined to said aperiodic antenna circuit, and to said radio receiving set.

2. Means for reducing static interference, comprisinfr a plurality of wires arranged in spaced relation, one of said wires being directly connected at one end to a radio receiving set and grounded at the other end through a resistance, the remainder of said wires being divided into two groups, the wires of one group being arranged in alternate relation with the wires of the other group to provide a condenser, and the wires forming aid condenser being connected to said radio receiving set.

3. Means for reducing static interference, comprising a plurality of wires arranged substantially parallel and in spaced relation, one

of said wires being connected at one end to t a radio receiving set and grounded at the opposite end, the remainder of said wires being divided into two groups, the wires of one of said groups being arranged in spaced relation to the wires of the other group to provide a condenser, and the wires forming said condenser being connected to said first mentioned wire.

In testimony whereof I have signed my name to this specification.

THOMAS R. BAKER.