US2093750A - Doubly-folded lecher wire system - Google Patents

Doubly-folded lecher wire system Download PDF

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Publication number
US2093750A
US2093750A US26883A US2688335A US2093750A US 2093750 A US2093750 A US 2093750A US 26883 A US26883 A US 26883A US 2688335 A US2688335 A US 2688335A US 2093750 A US2093750 A US 2093750A
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US
United States
Prior art keywords
wires
wire system
pair
lecher
doubly
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US26883A
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English (en)
Inventor
Vries Gerrit De
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/02—Lecher resonators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra

Definitions

  • This invention relates to a Lecher wire system adapted for use in producing and transmitting electric high frequency oscillations.
  • the natural frequency of such a system is given by the length of the wires. If, therefore, the tuning is to be altered, the length of the wires may be altered.
  • FIG. 1 of the accompanying drawing shows a known type of Lecher wire system constituted by wires l and 2 furnished with an interchangeable extension formed by a doubly-folded Lecher wire system ca, bb, cc, d'd.
  • the natural frequency can be adjusted to the correct value by means of bridge 5.
  • a disadvantage of such a system is that the two parts of the Lecher wire system aa, bb and cc, dd are coupled to each other both magnetically and electrically. This results in the influence exercised by the extension on the tuning being quite different from that exercised when the Lecher wire system is extended in the direction of the wires, as reflections occur which impair the effect of the extension.
  • doublyfolded Lecher wire systems are used to form the extension, the plane in which the leading wires and that in which the return wires are located being normal to each other and the wires being arranged symmetrically with respect to the line of intersection of said planes.
  • FIG. 1 illustrates a known type of system
  • Fig. 2 an arrangement in accordance with the invention.
  • Fig. 2 shows one form of construction of a Lecher wire system provided with terminals for the connection of interchangeable extensions according to the invention.
  • the wires are designated by I and 2.
  • the extension is designated by ac, bb", cc, dd.
  • the points of connection for the leads, or return wires, respectively, of the extension are diagonally connected to the terminals a, b, c, and d, arranged in the apices of a square.
  • the plane in which the two leading wires ac and bb, and the plane in which the two return wires 0'0 and dd, of the doubly-folded Lecher-wire system which constitutes the extension are located, are normal to each other and the wires are arranged symmetrically with respect to the line of intersection of these planes so that the two parts of the Lecher-wire system that constitutes the extension, are magnetically uncoupled.
  • the electric coupling between the wires of the extension connected to the points a, b, c, and d is neutralized by the arrangement of each of these wires being perfectly symmetrical with respect to those closest thereto.
  • a Lecher wire system comprising two pairs of parallel wires each pair being in the form of a loop, the wires of each pair terminating at the adjacent apices of a quadrangle, whereby diagonally oppositely located wires form legs of different loops.
  • quadrangle is a square and diagonally oppositely located wires are in the same plane, the planes of the diagonally located wires being substantially perpendicular to each other.
  • a Lecher wire system comprising a first pair of parallel wires and a second pair of parallel wires, the wires of one pair being arranged perpendicular to the wires of the other pair, the wires of each pair extending to diagonally opposite apices of a quadrangle, a U-shaped loop connecting together at said apices one wire of one pair with an adjacent wire of the other pair, another U-shaped loop connecting together at said apices the other adjacent wires of said pairs, whereby said two pairs of parallel wires are substantially devoid of electric and magnetic coupling between them.
  • a Lecher wire system comprising a first pair of parallel wires, a second pair of parallel wires arranged in a plane perpendicular to the plane of said first pair, the wires of said first pair being also arranged perpendicular to the wires of said second pair, the wires of each pair terminating at diagonally opposite apices of a square, whereby said apices are symmetric-a1 with respect to the line of intersection of said planes, a U-shaped loop connecting together at said apices, one wire of said first pair with an adjacent wire of said second pair, another U-shaped loop connecting together at said apices the other adjacent wires of said first and second pairs, the legs of said U-shaped loops which connect with one pair of diagonally opposite apices being in one plane, and the other legs of said U-shaped loops which connect with the remaining pair of diagonally opposite apices being in a plane perpendicular to said last plane, whereby said two pairs of parallel wires are substantially devoid of electric and magnetic coupling between them.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transceivers (AREA)
  • Insulated Conductors (AREA)
US26883A 1934-07-09 1935-06-15 Doubly-folded lecher wire system Expired - Lifetime US2093750A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE437338X 1934-07-09

Publications (1)

Publication Number Publication Date
US2093750A true US2093750A (en) 1937-09-21

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ID=6507018

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US26883A Expired - Lifetime US2093750A (en) 1934-07-09 1935-06-15 Doubly-folded lecher wire system

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US (1) US2093750A (enMihai)
FR (1) FR793433A (enMihai)
GB (1) GB437338A (enMihai)
NL (1) NL43088C (enMihai)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463440A (en) * 1941-07-28 1949-03-01 Hartford Nat Bank & Trust Co Circuit arrangement comprising a push-pull oscillatory circuit for very short waves
US2631241A (en) * 1949-04-23 1953-03-10 Du Mont Allen B Lab Inc Tuning device for high-frequency electrical energy
FR2568414A1 (fr) * 1984-05-25 1986-01-31 Thomson Csf Resonateurs electromagnetiques et filtres realises a partir de ces resonateurs.
EP0187579A1 (fr) * 1984-12-06 1986-07-16 Thomson-Csf Résonateurs électromagnétiques et filtres réalisés à partir de ces résonateurs

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463440A (en) * 1941-07-28 1949-03-01 Hartford Nat Bank & Trust Co Circuit arrangement comprising a push-pull oscillatory circuit for very short waves
US2631241A (en) * 1949-04-23 1953-03-10 Du Mont Allen B Lab Inc Tuning device for high-frequency electrical energy
FR2568414A1 (fr) * 1984-05-25 1986-01-31 Thomson Csf Resonateurs electromagnetiques et filtres realises a partir de ces resonateurs.
EP0187579A1 (fr) * 1984-12-06 1986-07-16 Thomson-Csf Résonateurs électromagnétiques et filtres réalisés à partir de ces résonateurs

Also Published As

Publication number Publication date
GB437338A (en) 1935-10-28
NL43088C (enMihai)
FR793433A (fr) 1936-01-24

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