Radiating line transmission system

• US 3,896,380 A
• Filed: 05/11/1973
• Issued: 07/22/1975
• Est. Priority Date: 05/26/1972
• Status: Expired due to Term

• Current Assignee: David James Reginald Martin
• Original Assignee: David James Reginald Martin
• Inventors: Martin, David James Reginald
• Primary Examiner(s): Griffin, Robert L.
• Assistant Examiner(s): Ng, Jin F.
• Application Number:
  US05/359,341
• Time in Patent Office: 802 Days
• Field of Search: 325/22,23,26,51,28,53,54,178,179,180 333/84R,26,95S,82B,97R,4,5 179/82 340/22,32,33
• US Class Current: 455/523
• CPC Class Codes: H01Q 13/20 Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/28 using the near field of leaky cables, e.g. of leaky coaxial cables

Abstract

A radiating transmission line system employs a pair of leaky coaxial cables which are spaced from each other and extend along a tunnel to propagate radio signals. The signals to be propagated are fed to both cables in such a manner that the signals in one cable are in antiphase to the signals in the other cable. This reduces attenuation of the signal in the cable.

Claims

1. A radiating transmission line system comprising a source of radiation, a pair of coaxial cables extending from the said source, the cables being parallel to each other along their length, each cable comprising an inner core, a surrounding dielectric material and an apertured continuous outer conductor, and means for applying energy from the source of radiation to both cables whereby the energy in one cable is in phase displacement to the energy in the other cable, wherein the said means for applying energy from the source of radiation to both cables comprises a transformer interposed between the said source of radiation and the pair of coaxial cables, the transformer having an output winding connected to the said cables, the outer conductors of the cables being connected to a common point on the output winding and the inner cores of the cables being connected respectively one to each end of the output winding.

2. A radiating transmission line system according to claim 1, in which the pair of cables are terminated each in its respective terminating impedance.

3. A radiating transmission line system according to claim 1, wherein the outer conductors of the pair of cables are terminated in a common impedance.

4. A radiating transmission line system comprising a source of radiation, a transformer having a primary winding and a center tapped secondary winding, a pair of similar coaxial cables, each cable being comprised of an inner core, a surrounding dielectric material and an apertured continuous outer conductor, spacer means for maintaining the said cables substantially parallel, each inner core terminates in its respective impedance, the outer conductors terminate in a common impedance, and at least one mobile receiver along the pair of coaxial cables for receiving signals propagated from the cables;

the inner core of a first of the said coaxial cables being connected to one end of the said transformer secondary winding and the inner core of the other of the said coaxial cables being connected to the other end of the said transformer secondary winding so that in operation signals from the source are transmitted in the first of the coaxial cables in phase opposition to the signals transmitted in the second of the cables.

5. A radiating transmission line system comprising a source of radiation, a pair of coaxial cables extending from the said source, the cables being parallel to each other along their length, each cable comprising an inner core, a surrounding dielectric material and an apertured continuous outer conductor, each inner core terminating in its respective terminating impedance means and the outer conductors terminating in a common impedance, and delay means comprising an additional length of cable having a length which is an odd number of half wavelengths of the frequency of the source of radiation inserted in one of the cables of the said pair of cables, and means applying energy from the source of radiation to both cables whereby the energy in one cable is in phase oppositIon to the energy in the other cable.