US2552146A - Duplex directive antenna system - Google Patents

Duplex directive antenna system Download PDF

Info

Publication number
US2552146A
US2552146A US25897A US2589748A US2552146A US 2552146 A US2552146 A US 2552146A US 25897 A US25897 A US 25897A US 2589748 A US2589748 A US 2589748A US 2552146 A US2552146 A US 2552146A
Authority
US
United States
Prior art keywords
conductor
plane
antenna
pair
section
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
US25897A
Other languages
English (en)
Inventor
Jr Burton P Brown
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to BE488912D priority Critical patent/BE488912A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US25897A priority patent/US2552146A/en
Priority to FR985757D priority patent/FR985757A/fr
Application granted granted Critical
Publication of US2552146A publication Critical patent/US2552146A/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
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
    • H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
    • H01Q19/134—Rear-feeds; Splash plate feeds
    • H01Q19/136—Rear-feeds; Splash plate feeds cross-polarised

Definitions

  • This invention relates to a unitary antenna system utilizing two trains of plane polarized electromagnetic waves, mutually perpendicular to each other in the plane at right angles to their direction of propagation and capable of providing simultaneous operation of radio apparatus on the same or on closely adjacent frequencies.
  • Another object of this invention is to provide a new and improved antenna mount and feed assembly for two mutually perpendicular dipoles so that the dipoles may be independently excited and yet electrically decoupled from each other.
  • a further object of this invention is to provide an improved means for mounting a reflecting plate in front of the two mutually perpendicular dipoles of such a duplex antenna system, in such a way that in conjunction with a concave reflector, said reflecting plate will conserve the direct forward radiation and yet not disturb the electrical decoupling of the two dipoles.
  • Fig. l is a longitudinal sectional view of a duplex directive antenna system embodying the invention
  • Fig. 2 is a partial sectional view in the plane AA in Fig. 1 and looking in the direction of the two arrows.
  • the capital letters A, B, C, D, E, F, G and H refer to plane sections through the assembly at the positions indicated by the adjacent section lines.
  • the system comprises a concave reflector i which may be a paraboloid in form.
  • the vertical dipole antenna consists of members 2 and 3 while the horizontal dipole antenna consists of members 4 and 5 and the one is mounted at 90 with respect to the other.
  • the dipole members may consist of flat plates with rounded ends as shown.
  • a co-axial transmission line I, 8 enters the assembly at section B and feeds the vertical dipole 2, 3.
  • a similar co-axial transmission line 9, It] has an expanding conical cross section from section D to section E for improved matching purposes and enters the main assembly at section C, where conductor 9 is fastened to conductor 8.
  • the coaxial transmission lines '1, 8 and 9, l0 are adapted to be energized from two separate sources of high frequency energy which may be of the same or different frequencies.
  • the invention has particular utility in a system where the antennas are to be energized at the same, or
  • Section B to C of tubular conductor l2 provides a quarter-wavelength metallic insulator to secure the assembly, the quarter wavelength being with respect to the frequency impressed between conductors 9 and I8.
  • tubular shell [4 is fastened to the outside of tubular conductor I2 which is there terminated in an expanding conical cross section.
  • a conducting cone i5 is fastened to conductor 8 and at section G an intermediate tubular shell I3 is fastened to the conducting cone I5.
  • the purpose of the conical cross section of tubular conductor l2 and of cone I5 is to provide an impedance match between the co-axial system consisting of conductors l2 and 8 and the system consisting of shells l3 and [4.
  • Two slots 26 are formed by cutting conductor 8 on both sides in parallel horizontal planes for a length of approximately one-quarter wavelength at the operating frequency of the dipole 2, 3, on either side of section line A and extending from section H to section G.
  • inner conductor 1 is fastened by a short vertical conductor 25 to either the upper or lower segment of conductor 8.
  • the upper segment of conductor 8 is the one connected.
  • Two short slots 2'! are formed by cutting shell is on both sides in parallel vertical planes for a length suificient to insure the projection of dipole elements 2 and 3 through the shell without contact.
  • Two slots 28 are formed by cutting shell E4 on both sides in parallel vertical planes for a length of approximately one-quarter wavelength
  • dipole elements 4 and 5 are fastened to shell l4, and one of the elements, in this embodiment the righthand element 4 as shown in Fig. 2, projects right through shell M and is also fastened to shell I3.
  • the conducting assembly consisting of conductor 8 and shells l3 and M, is terminated by a bushing 38.
  • is fastened to the bushing 38 and is placed at a distance from section A through the dipole elements of approximately one-quarter wavelength at the mean operating frequency of the dipoles.
  • the effect of the quarter-wave portion of the slots 26 from section G to section A is to make a balancing transformer of the uncut sections of conductor 8 which convert the balanced impedance of the dipole elements 2 and 3 into the characteristic impedance of inner conductor I to conductor 8.
  • the effect of the portion of the slots 28 from section G to section A is to make a balancing transformer of the uncut section of shell I4 which converts the balanced impedance of the dipole elements 4 and 5 into the characteristic impedance of shell 13 to shell l4.
  • the short slots 21 in shell I3 are simply to permit mounting of the vertical dipole elements 2 and 3 independently of shell I3.
  • the purpose of the quarter-wave portions of slots 26 and 28, from section A to section H, is to effect a metallic insulator to provide a more balanced and decoupled electric field and to give mechani-- cal support to reflector 3
  • the radio frequency excitation to dipole elements 2 and 3 is by means of the electromagnetic field existing between conductors 1 and 8, and similarly, the radio frequency excitation to dipole elements 4 and 5 is by means of the electromagnetic field existing between conductor 8 and tubular conductor I2.
  • the impedance is converted and to the left of section G, the excitation for dipole elements 2 and 3 remains unchanged by means of the electromagnetic field between conductors I and 8, while the excitation to dipole elements 4 and 5 is now by means of the electromagnetic field existing between shells I3 and Hi.
  • the purpose of this arrangement is to decouple the vertical dipole elements from the horizontal dipole elements and prevent any coupling in the feed system.
  • a duplex directive antenna system for simultaneous operation with two independent radio frequency waves of the same or closely adjacent high frequencies, comprising a' pair of mutually perpendicular dipole antennas lying in a plane normal to the directive axis of the system, each dipole antenna having a pair of center feed points, a coaxial structure comprising an in ner conductor extending along said axis and surrounded by an intermediate coaxial tubular conductor and by an outer coaxial tubular conductor, said structure terminating at a distance from said plane substantially equal to one quarter wavelength at the mean operating frequency of said antennas, first coupling means for supplyin wave energy to the first channel defined by said inner and intermediate conductors, second coupling means for supplying Wave energy to the second channel defined by said intermediate and outer conductors, and two groups of three substantially parallel line conductors for individually coupling said antennas to said channels, said first group providing a first connection from one feed point of one antenna to the end of said inner conductor, a second connection from said one feed point of said one antenna to the end of said intermediate conductor and
  • a duplex directive antenna system for simultaneously operation with two independent radio frequency waves comprising a pair of mutually perpendicular dipole antennas lying in a plane normal to the directive axis of the system, each dipole antenna having a pair of center feed points, a coaxial structure comprising an inner conductor extending along said axis to said plane and surrounded by an intermediate coaxial tubular conductor and by an outer coaxial tubular conductor, first coupling means for supplying wave energy to the first channel defined by said inner and intermediate conductors, second coupling means for supplying wave energy to the second channel defined by said intermediate and outer conductors, said intermediate and outer conductors each being cut away to define a pair of complementary longitudinal slots opposite a different one of said antennas, the remaining wall portions forming inner and outer pairs of substantially parallel conducting portions, one pair of said conducting portions being connected to the feed points of each antenna, each of said slots extending away from said plane along said axis by a distance substantially equal to a quarter wavelength at the frequency of operation of the antenna connected to the adjacent portions, a
  • a duplex directive antenna system for simultaneous operation with two independent radio frequency waves comprising a pair of mutually perpendicular dipole antennas lying in a plane normal to the directive axis of the system, each dipole antenna having a pair of center feed points, a coaxial structure comprising an inner conductor extending along said axis to said plane and surrounded by an intermediate coaxial tubular conductor and by an outer coaxial tubular conductor, first coupling means for supplying wave energy to the first channel defined by said inner and intermediate conductors, second coupling means for supplying wave energy to the second channel defined by said intermediate and outer conductors, said intermediate and outer conductors being cut away to define a pair of complementary longitudinal slots opposite a different one of said antennas, the remaining walls forming inner and outer pairs of substantially parallel conducting portions, one pair of said conducting portions being connected in said plane to the feed points of each antenna, each of said pairs of slots extending away from said plane along said axis by a distance substantially equal to a quarter wavelength at the frequency of operation of the antenna connected to the respective portions
  • a duplex directive antenna system for simultaneous operation with two independent radio frequency waves comprising a pair of mutually perpendicular dipole antennas lying in a plane normal to the directive axis of the system, each dipole antenna having a pair of center feed points, a coaxial structure comprising an inner conductor extending along said axis and surrounded by an intermediate coaxial tubular conductor and by an outer coaxial tubular conductor, first coupling means for supplying wave energy to the first channel defined by said inner and intermediate conductors, a second coupling means for supplying wave energy to the second channel defined by said intermediate and outer conductors, said intermediate and outer conductors each being cut away on both sides of said plane to define a pair of complementary longitudinal slots opposite a different one of said antennas, the remaining walls forming inner and outer pairs of substantially parallel conducting portions, one pair of said conducting portions being connected in said plane to the feed points of each antenna, and said slots each extending away from said plane in both directions along said axis by a distance substantially equal to a quarter wavelength at the frequency of operation of
  • a duplex unidirectional antenna system for simultaneous operation with two independent radio frequency waves comprising a pair of mutually perpendicular dipole antennas lying in a plane normal to the directive axis of the system, each dipole antenna having a pair of center feed points, a coaxial structure comprising an inner conductor extending along said axis and surrounded by an intermediate coaxial tubular conductor and by an outer coaxial tubular conductor, first coupling means for supplying wave energy to the first channel defined by said inner and intermediate conductors, second coupling means for supplying wave energy to the second channel defined by said intermediate and outer conductors, said intermediate and outer conduetors each being cut away on both sides of said plane to define a pair of complementary longitudinal slots opposite a different one of said antennas, the remaining walls forming inner and outer pairs of substantially parallel conducting portions, one pair being connected in said plane to the feed points of each antenna, and said slots each extending away from said plane in both directions along said axis by a distance substantially equal to a quarter wavelength at the frequency of operation of the antenna connected
  • a duplex unidirectional antenna system for simultaneous operation with two independent radio waves on closely adjacent frequencies, comprising a pair of mutually perpendicular dipole antennas lying in a plane normal to the directive axis of the system, each dipole antenna having a pair of center feed points, a coaxial structure comprising an inner conductor extending along said axis and surrounded by an intermediate coaxial tubular conductor and an outer coaxial tubular conductor, first coupling means for supplying wave energy to the first channel defined by said inner and intermediate conductors, second coupling means for supplying wave energy to the second channel defined by said intermediate and outer conductors, said intermediate and outer conductors each being cut away on both sides of said plane to define a pair of complementary longitudinal slots opposite a different one of said antennas, the remaining walls forming inner and outer pairs of substantially parallel conducting portions, one pair being connected in said plane to the feed points of each antenna, and said slots each extending forwardly and also rearwardly from said plane along said axis by distances substantially equal to a quarter wavelength at the mean operating frequency

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
US25897A 1948-05-08 1948-05-08 Duplex directive antenna system Expired - Lifetime US2552146A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE488912D BE488912A (fr) 1948-05-08
US25897A US2552146A (en) 1948-05-08 1948-05-08 Duplex directive antenna system
FR985757D FR985757A (fr) 1948-05-08 1949-05-06 Antenne directive à deux voies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25897A US2552146A (en) 1948-05-08 1948-05-08 Duplex directive antenna system

Publications (1)

Publication Number Publication Date
US2552146A true US2552146A (en) 1951-05-08

Family

ID=21828653

Family Applications (1)

Application Number Title Priority Date Filing Date
US25897A Expired - Lifetime US2552146A (en) 1948-05-08 1948-05-08 Duplex directive antenna system

Country Status (3)

Country Link
US (1) US2552146A (fr)
BE (1) BE488912A (fr)
FR (1) FR985757A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE951733C (de) * 1953-01-13 1956-10-31 Telefunken Gmbh Einrichtung zum Anschluss einer koaxialen Hochfrequenzleitung an einen Verbraucher oder Generator mit symmetrischem Eingang
US2954556A (en) * 1956-10-10 1960-09-27 Andrew Corp Cross polarized dual feed
US5748156A (en) * 1994-02-28 1998-05-05 Chaparral Communications High-performance antenna structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1927393A (en) * 1931-07-10 1933-09-19 Int Communications Lab Inc Transmission system for ultrashort waves
US2251530A (en) * 1940-03-19 1941-08-05 Rca Corp Support for high frequency concentric conductors
US2417895A (en) * 1945-06-05 1947-03-25 Hazeltine Research Inc Balanced to unbalanced circuit connector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1927393A (en) * 1931-07-10 1933-09-19 Int Communications Lab Inc Transmission system for ultrashort waves
US2251530A (en) * 1940-03-19 1941-08-05 Rca Corp Support for high frequency concentric conductors
US2417895A (en) * 1945-06-05 1947-03-25 Hazeltine Research Inc Balanced to unbalanced circuit connector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE951733C (de) * 1953-01-13 1956-10-31 Telefunken Gmbh Einrichtung zum Anschluss einer koaxialen Hochfrequenzleitung an einen Verbraucher oder Generator mit symmetrischem Eingang
US2954556A (en) * 1956-10-10 1960-09-27 Andrew Corp Cross polarized dual feed
US5748156A (en) * 1994-02-28 1998-05-05 Chaparral Communications High-performance antenna structure

Also Published As

Publication number Publication date
FR985757A (fr) 1951-07-23
BE488912A (fr)

Similar Documents

Publication Publication Date Title
US2556094A (en) High-frequency apparatus
US3555553A (en) Coaxial-line to waveguide transition for horn antenna
US3750185A (en) Dipole antenna array
US2993205A (en) Surface wave antenna array with radiators for coupling surface wave to free space wave
US2455403A (en) Antenna
US2398096A (en) Two frequency electromagnetic horn radiator
US2362561A (en) Horn radiator
US2479227A (en) Dual frequency antenna
US3500419A (en) Dual frequency,dual polarized cassegrain antenna
US2846678A (en) Dual frequency antenna
US2719230A (en) Dual frequency antenna
US3613098A (en) Electrically small cavity antenna
US20020113746A1 (en) High power broadband feed
US2548821A (en) Horn radiator adapted to be fed by a coaxial line
GB635343A (en) Improvements in radio antennas
US3205499A (en) Dual polarized horn antenna
US3702479A (en) Space diversity antenna system for uhf satellite communications for helicopters
US2512137A (en) Antenna
US2618746A (en) Antenna system
US2459768A (en) Apparatus for the radiation or reception of electromagnetic waves
US3114913A (en) Wing type dipole antenna with u-shaped director
US2552146A (en) Duplex directive antenna system
US2380519A (en) Directional aerial system
US2421988A (en) Directive antenna
US2471515A (en) Antenna