US2241914A - Toroidal coil - Google Patents

Description

May 13, 1941. K. KOSCHMIEDER TOROIDAL CO IL Filed April 13, 1938 impressed upon these Patented May 13, 1941 TOROIDAL COIL Kurt Koschmieder,

Falkensee, Germany, asaignor to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof, Lorenzweg, Germany, a company Application April 13, 1938, Serial No. 201,702 Germany April 15, 1937 1 Claim (CL 175-359) The invention relates to toroidal coils such,

for example, as used for coupling an a transmitter or a measuring receiver to the energylines of an antenna system freeof fading, such as an Adcock antenna. As is well known, in order to ascertain whether in systems of this kind the energy lines have a radiation or a reception component, a voltage is by local action lines with the aid of an auxiliary transmitter. The voltage thus added is adjusted to bring about an effect counteracting the.so-calledhorizontal effect of the incoming waves while being of the same magnitude as this.

To such end a coil is placed'around the energy line and fed from a small high frequency generator whose frequency or operating wavelength corresponds to that of the direction finding system. The antenna system is then balanced until high frequency components cease to occur in the direction finding receiver. If a direction finding transmitter is concerned instead of a receiver, a measuring receiver is coupled to the energy lines, and with the aid of this measuring receiver the energy lines are balanced to present the minimum radiation. 1

The coil used for coupling either the auxiliary transmitter or the measuring receiver to the energy lines must be such that it shall not act as a radiating or receiving means. For this reason this coil is'wound in toroidal fashion.

In order that the coil can be qui and simply applied to the energy line of the antenna system the invention proposes to make it in two parts. Itwillthennotbenecessarytodisconnecttheenergyllneinordertoinsertthecoil therecver, but the two parts of the cell are simply placed around the line and are then fastened toea'chothen.

Inaccordance with another feature of the inventlontheradiationpropertiesofthecoilare diminished by a screening provided on all sides Oneembodimentoftheinventionisdescribed hereafter by way of example, reference being had to the accompanying drawing in which Fig. 1 is a partially sectioned side view of a toroidal coil as provided by the invention, Fig. 2 is a plan view of one half of such coil.

The device here shown comprises two half-ring bodies A, B made of a suitable insulating material. Body A carries a toroidal winding Ihof radio cable. Equally, body 13 is fitted with a toroidal radio cable winding ii. The two wire ends of winding it are joined to a plug 2 each. The plugs 2 areiastened in body A. The two wire ends of winding ii are joined to a socket I each. The sockets l are fixed in' body B and are adapted to receive the plugs 2. Winding I4 is contained in a screening jacket 3. Equally, winding ii is provided with a screening 4. These jackets are made of strong sheet copper and are subdivided by slots 5, 6 in order not to act as short-circuited windings. Fixed to jacket 4 are metal springs 1 which serve to clot:- trically interconnect the jackets I, ing the air gap III which there is between the halves of the coil. Jacket 3 has two lugs it while jacket I is provided with two lugs II. In these lugs screws 8 are inserted in order is hold the halves of the coil together. A screened cable 0, attached to the coil through a screw joint ll. serves to connect the coil with the said auxiliary transmitter or measuring receiver, as the case may be. These are likewise completely screened.

What is claimed is:

A toroidal coil comprising two half-ring shaped insulating bodies, an arcuate solenoidal air-core winding on each or these bodies, a subdivided screening jacket for each of these windings, metal springs fastened to one of such jackets and adapted to engage the other jacket, lugs fitted to the said jackets, fastening screws seated in these lugs, and an arrangement of. plugs and plug said insulating bodies and to the said windings are joined.

Jacket

Images