US1874966A - Aerial system and feeding system therefor - Google Patents

Aerial system and feeding system therefor Download PDF

Info

Publication number
US1874966A
US1874966A US177979A US17797927A US1874966A US 1874966 A US1874966 A US 1874966A US 177979 A US177979 A US 177979A US 17797927 A US17797927 A US 17797927A US 1874966 A US1874966 A US 1874966A
Authority
US
United States
Prior art keywords
aerial
cables
cable
twin
high frequency
Prior art date
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
Application number
US177979A
Other languages
English (en)
Inventor
Green Ernest
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.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1874966A publication Critical patent/US1874966A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
    • H01Q21/12—Parallel arrangements of substantially straight elongated conductive units

Definitions

  • This invention relates to aerial systems, and, feeding systems therefor, and more particularly to aerial'systems for use in direc-i tional radio telegraphy andtelephony.
  • aerial systems for use in directional radio telegraphy and telephony have dimensions of the order of several wave lengths, and are fed with high frequency at a number of points throughout their extent by means of cables.
  • the object of the present invention is to provide a feeding system for use with such an aerial system in which reflection along the cables shall be reduced to a minimum.
  • aerial system comprising a single aerial fed through an aerial transformer and length of uniform cable from a source of high frequency energy
  • reflections are substantially eliminated when the tune of the aerial and the coupling of the trans former are so adjusted that the effective load at the aerial end of the cable is a resistance numerically equal to the square root of the quotient obtainedby dividing the effective inductance by the effective capacity.
  • the said resistance which is, of course, equal to the surge impedance, will be designated by the symbol R0.
  • the present invention provides a method whereby such stationary waves may be substantially eliminated in the transmitter cable, and reduced in the intermediate and aerial cables.
  • n will be sees that f that be an as
  • A1, A2, A3 and A4 are aerials fed through cable sections 1, 2, 8, 4, 5, 6, 7, by way of junctions T1, T2 and T3. It will be seen that if the aerial loads are correctly adjusted so that there will be no stationary waves in the sections 1, 2, 3, 4E, thetwo sections 1' and- 2, in parallel at the junction T1, constitute a load v A R0 upon the section 5. Similarly the sections 3, 4, in parallel constitute a load Roupon the section 6.
  • the sections 5 and 6 are made each an odd number of quar-' ter wave lengths long,'so that the effective impedance of each at their junction T3 is substantially that of apure resistance 2R0.
  • the invention is equallyapplicable to the reception as to the transmissionof wireless tele raphy' and telephony; j
  • a feeder or the like for feeding high frequency energy to a pluralityof antennae comprising a transmitter twin cable, an intermediate twin cable, and a pair of twin aerial cables coupled at their ends to said antennae through a couplingwhich impresses a load on said' aerial cables equal'to their surge im: pedance' whereby standing waves are eliminatedin said'twin aerial cables, said inter-.
  • mediate twin cables being connected atits ends to the mid-points of each of said twin aerial cables and at its mid-point to said transmitter twin cable and being an odd number of quarter wave lengths long in each branch whereby standing waves are eliminated in said transmitter, twin cable.
  • An energy transfer system between a high frequency source and a plurality of high frequency circuits comprising a path from said source, a pair of paths connected to the first mentioned path,said pair of paths each having. a'lengt h equal to an odd number of quarter wave lengths of the energy being transferred, and means electrically connect ing said pair of paths to said plurality-of high frequency circuits, said means impressing a load on saidpair of paths which is equal to one-half the surge impedance of said paths.
  • An energy transfer system between a high frequency source and a plurality of high frequency circuits comprising a path from said source, a plurality of pathsconnected to the end of said path, each of said plurality of paths having an; effectivelength equal to a quarter wavelength of the energy being transferred, and means electrically connectingsaid'pluralityof paths to said high frequency circuits, said means impressing loads .on the ends of said plurality of'paths of such values that their reciprocals will combine at the end of the first mentioned path to form vanimpedance equal to the surge impedance of said first mentioned path.

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Emergency Protection Circuit Devices (AREA)
US177979A 1926-04-30 1927-03-24 Aerial system and feeding system therefor Expired - Lifetime US1874966A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11430/26A GB274970A (en) 1926-04-30 1926-04-30 Improvements in or relating to aerial systems and feeding systems therefor

Publications (1)

Publication Number Publication Date
US1874966A true US1874966A (en) 1932-08-30

Family

ID=9986092

Family Applications (1)

Application Number Title Priority Date Filing Date
US177979A Expired - Lifetime US1874966A (en) 1926-04-30 1927-03-24 Aerial system and feeding system therefor

Country Status (5)

Country Link
US (1) US1874966A (enrdf_load_stackoverflow)
BE (1) BE341616A (enrdf_load_stackoverflow)
FR (1) FR633200A (enrdf_load_stackoverflow)
GB (1) GB274970A (enrdf_load_stackoverflow)
NL (1) NL23456C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465843A (en) * 1944-08-16 1949-03-29 Rca Corp Radio frequency power division network
US2716694A (en) * 1951-06-16 1955-08-30 Gen Electric Combination electric and ultra-high frequency heating apparatus
US2867804A (en) * 1954-12-01 1959-01-06 Rca Corp Antenna array and feed system therefor
US2876448A (en) * 1954-03-30 1959-03-03 Radio Patents Company Multiple decoupled antennae connected to radio by different length feeder for impedance mismatch reduction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465843A (en) * 1944-08-16 1949-03-29 Rca Corp Radio frequency power division network
US2716694A (en) * 1951-06-16 1955-08-30 Gen Electric Combination electric and ultra-high frequency heating apparatus
US2876448A (en) * 1954-03-30 1959-03-03 Radio Patents Company Multiple decoupled antennae connected to radio by different length feeder for impedance mismatch reduction
US2867804A (en) * 1954-12-01 1959-01-06 Rca Corp Antenna array and feed system therefor

Also Published As

Publication number Publication date
NL23456C (enrdf_load_stackoverflow)
BE341616A (enrdf_load_stackoverflow)
GB274970A (en) 1927-08-02
FR633200A (fr) 1928-01-23

Similar Documents

Publication Publication Date Title
US2283914A (en) Antenna
US2540839A (en) Wave guide system
US1898661A (en) Antenna system
US2267951A (en) Antenna
US3276028A (en) High gain backfire antenna array
US2321521A (en) Frequency band filter
US2292496A (en) Transmission line circuit
US2513007A (en) Broadcast antenna
US1874966A (en) Aerial system and feeding system therefor
US1964189A (en) Directive antenna
US2258406A (en) Wide band antenna
US2366195A (en) Antenna array
US2428831A (en) Radio power division network
US2413609A (en) Time-delay network
US1959407A (en) Transmission system
US2769169A (en) Dipole impedance matching device
US2193859A (en) Ultra short wave antenna
US2704811A (en) Cylindrical antenna
US2258407A (en) Wide band antenna
US1965539A (en) Duplex radio aerial system
US3375524A (en) Antenna distributor circuit for four dipoles with adjacent dipoles in phase quadrature
US2126295A (en) Antenna system
US2238904A (en) Short wave communication system
US2572672A (en) Impedance transforming network
US1952411A (en) Transmission network