DE1723575U - REACTOR FOR HIGH FREQUENCIES. - Google Patents

Description

j; 21a ⁴ , 68. 1725575. Philips Patentver- "waltung G. mb H .. Hamburg L | Dros- 7 ium sclspule for high frequencies. 12. 10. 55." ^Jum _f P 8901. (T. 4; Z. 1) ν -ι λ

ßipl.-Ing. KÜRT.LENGNER

Pl

J ^ ldor: Philips Patentverwaltung GmbH !, Hamburg

! File No. KK / G-42

dung voaa 11.10.1955

Philips Patentverwaltung GmbH. Hamburg 1, Mönckebergstr. Choke coil for high frequencies.

The hiring refers to a choke coil for high Frequencies, preferably over 10 MIz, with closed ferromagnetic !!! Core.

Pe / 10

Such choke coils are used as attenuators in feed lines of radio devices in which undesired high and intermediate frequencies or impulse signals occur. It is currently known to attenuate these unwanted frequencies and signals to cover the lines with so-called. Beads made of ferromagnetic material, in particular ferrite. Due to the high permeability of the ferromagnetic material, the inductance of the conductor increases in such a way that the line acts as an HF choke, {at the same time the HF, ZP or pulse signals are attenuated due to the high losses in the ferromagnetic material. However, the impedance of such a "choke bead" ^v ~ t r " at a frequency of 100 MHz is only about 30 Q, so that its attenuation is in many cases insufficient. In addition, the inductive component of the impedance in the known beads is also at high frequencies still relatively large, so that undesirable resonance phenomena can easily occur.

- 2 -

21a ⁴ , 6S. 1723 575. Philips Patentverwaltung G. mb H., Hamburg 1. | Dros- 7 iiitri

_o high frequency coil. ^{12.10.55. &Quot; JUfii}

- £ ■ - PS901. (T. 4; line 1)

The innovation overcomes these disadvantages and provides a choke coil of the type mentioned, the impedance of which is a multiple of the "on" known throttle beads, thereby the coil core consists openings with at least two approximately parallel ^ continuous [, di3 from a block ferroraagnetischen material '' dur ~ h which the windings are passed through. '. Ir

Γ t r

The block forming the coil core is preferably cylindrical three shaped and the openings run approximately

parallel to the axis of the 3 cylinder. I.

In this way it is achieved that the magnetic lines of force of the windings are completely over the ferromagnetic Close material. If the turns are only wound on an open coil core or in longitudinal grooves of a rod core> are laid, the with the Droüselspule not even close to achievable values after the innovation reach.

The coil core consists mainly of ferromagnetic !!! cubic ferrite, which has the greatest possible losses for the frequencies to be damped.

The innovation is shown on the basis of one in the drawing Embodiment; explained in more detail «,

The figure shows a diagrammatic representation of a choke coil according to the innovation. \

The choke coil consists of a cylindrical ferromagnetic rod core 1 made of a cubic ferrite, which has the greatest possible losses for the frequencies to be damped. The core 1 has five approximately axially and mutually parallel openings 2 which penetrate the core 1 over its entire length. Through these openings 2 a coil winding 3 is pulled, which in the _present case is rj 2-of · turns. The number of turns can be

• ■■ ■ ■ ■ '.- .. ".' ■ ■ -3 - ■■■■ ;,]

:; ' 21a ⁴ , 6S- 1723 575. Philips patent

administration G. mb H., Hamburg 1.] Throttle coil for high frequencies. 12. 10. 55. '* ^{üm la} " ^S P 8901. (T. 4; line 1) ___

however, both smaller, e.g. one, & ls also selected larger will. Because the winding .3. almost entirely inside) of the ferromagnetic core 1 is their magnetic Lines of force completely over the electromagnetic closed, so that practically no scattering occurs and the impedance of such a Droscelspule is very high.

In one embodiment after the innovation, the diameter of the coil core was 6 mm and its length was 12 mm. The core was provided with five openings, each about 0.7 mm in diameter, through which 2-k turns of a wire about 0.5 mm in diameter were drawn. The impedance of the choke coil was practically constant in a frequency range from about 50 MHz to almost 300 ItIHz and was about 1Ω. The real component of the impedance made up more than 90 feet of this resistance over the entire frequency range, so that such a choke coil is practically effective as a purely ohmic resistance in the specified frequency range. Since the reactive component of the impedance has a negligible value, In this case there is also no risk of any undesirable resonance seizures occurring.

If necessary, the parts protruding from the core 1 can of the turns 3 are embedded in an insulating compound.

Protection claims

Claims (4)

21a4, 68, 1723 575. Philips Patentverwaltung G. m. B. H., Hamburg 1. I Dros- 7 min se coil for high frequencies. 12. 10. 55. '' Jm P 8901 (T 4 Z 1) - 4 - '· P 8901. (T. 4; Z. 1)' ■ ■ '■.' ■■ '. ■■> i Claims for protection : ί "- -,. ; j ί: Il 1. Choke coil for high frequencies "preferably above I f 10 MHz, with a closed ferromagnetic ^ core, characterized in that the core (1) consists of a block of ferromagnetic material with at least two approximately parallel, continuous openings (2), through which the turns (3) are passed. ; 2. Choke coil according to claim 1, characterized in that the block forming the "core" (1) is cylindrical in shape and the openings (2) run approximately parallel to the axis of the cylinder. 3. Choke coil according to Claims 1 and 2, characterized in that that the parts (4) of the windings (3) protruding from the core (1) are embedded in an insulating compound. 4. Choke coil according to claims 1 to 3, characterized in that the coil core (1) is made of ferromagnetic cubic ferrite, which has the greatest possible losses for the Ixe to be damped sequences. Dipl.-Ing. KURT LENGNER Patent attorney