US2513007A - Broadcast antenna - Google Patents

Broadcast antenna Download PDF

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Publication number
US2513007A
US2513007A US593152A US59315245A US2513007A US 2513007 A US2513007 A US 2513007A US 593152 A US593152 A US 593152A US 59315245 A US59315245 A US 59315245A US 2513007 A US2513007 A US 2513007A
Authority
US
United States
Prior art keywords
slot
cylinder
length
antenna
along
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
US593152A
Other languages
English (en)
Inventor
Darling Woodrow
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
Priority to BE465085D priority Critical patent/BE465085A/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US593152A priority patent/US2513007A/en
Priority to FR926207D priority patent/FR926207A/fr
Priority to GB14267/46A priority patent/GB635343A/en
Application granted granted Critical
Publication of US2513007A publication Critical patent/US2513007A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/12—Longitudinally slotted cylinder antennas; Equivalent structures

Definitions

  • the present invention relates to broadcast antennas and, more particularly, to such antennas designed for ultra short wave operation.
  • An object of the present invention is the provision of a high frequency broadcast antenna requiring a minimum number of feed points from the transmission line to the antenna structure itself.
  • a further object of the present invention is the provision of a high frequency antenna which does not require a number of apelookas or high impedance trap circuits along the transmission line to prevent the flow of high frequency energy along the outside of the transmission line.
  • A'further object of the present invention is the provision of a high frequency broadcast antenna having substantially a uniform horizontal radiation pattern.
  • Still a further object of the present invention is the provision of a high frequency broadcast antenna radiating horizontally polarized energy.
  • Still another object of the present invention is the provision of a multilayer high frequency broadcast antenna having a high gain per layer.
  • Still a further object of the present invention is the provision of a wide band high frequency broadcast antenna.
  • Still another object of the present invention is the'provision of a high frequency broadcast antenna which is characterized by simplicity of mechanical construction and which is furthermore electrically grounded for protection from lightning strokes.
  • An additional object of the present invention is to provide an antenna having a minimum numher of feed points and uniform horizontal pat- V tern" of horizontally polarized radiation and whcrein'a circular current flow in horizontal planes in the antenna is obtained.
  • an antenna in the form of a vertically disposed hollow conductive cylinder having a circumference equal to a half wavelength at the operating frequency and an overall length, in a preferred elemental embodiment, equal to onewavelen'gth.
  • a narrow longitudinal slot closed at each end is provided along the length of the cylinder. It has been found that by appropriately adjusting the width of the longitudinal slot and the length of the slot, a band width of up to 12 or. 15 percent of the midband frequency may-be satisfactorily obtained.
  • a transmission line-for connecting the antenna to turned inwardly to form flanges the associated transmitting and/or receiving equipment is coupled across the slot at a position midway between its ends.
  • the structure as so far described may be stacked in a number of vertical layers in order to I increase the vertical directivity to any desired extent.
  • Figure 1 illustrates in elevation an embodiment of the present invention
  • Figure 2 illustrates in horizontal cross section a view of the antenna of Figure 1 taken at line 2, 2 of Figure 1;
  • Figure 3 illustrates in vertical section a modification of the present invention utilizing a pair of vertically stacked antennas such as those shown in Figure 1 to increase the vertical directivity;
  • Figure 4 illustrates in vertical section a further modification of the present invention utilizing a vertically stacked array of three antennas "similar to that shown in Figure 1.
  • Figure 5 illustrates in vertical section a modified form of the invention shown in Figure 3 wherein a different manner of connecting th feed line is utilized.
  • FIG. 1 there is shown a broadcast antenna in the form of a ver----. tically disposed hollow conductive cylinder 10,,"- having a longitudinal slot l2 extending from one The edges of slot I2 may be '1 l3 and My end to the other.
  • outwardly extending flanges may be used if desired.
  • the slot [2 is preferably electrically closed at each end.
  • the antenna is connected to a'transr'nitter or receiver by means of transmission line TL having an outer sheath l8 and inner conductor 20
  • transmission line TL having an outer sheath l8 and inner conductor 20
  • the outer shell I8 is preferably bonded to the interior of the hollow cylinder in at several pointswtwo equal length branches T141 and TL2.
  • Transmission line TL]. crosses and is connected to the upper slot 22 at substantially its midpoint. while transmission line TLz also crosses and is directly connected to the lower slot 32 at substantially its midpoint.
  • the other ends of transmission lines TL; and 11-2 are connected togethe'rflinia parallel relationship: and: then connected to transmision lindTL.
  • this vertical stacking oftwo radiators serves subis immediately adjacent fiangesxhwllfndesiredg stantially' tow'comprfess the radiation in a narrow flanges l3, [4 may be turned outwardly, in .which. angle, thereby increasing the effectiveness of the case it may be preferred.
  • the hollow conductive cylinder ll has an exterior-'-circumterence "sub 7 stahtially" equal-to 'one'half of'a wavelength at thefoperatin'g frequency: length ofthe an tennafithat is, its" dimension measured alongthe slot, is preferably equal to one wavelength at theop'erating -frequency as illustrated-inl i'gure 1;
  • cordance with-. Figures 1 andz2 are stacked'one'..-1 above tithe other; thusz makingiza tota'lizoverall height of two wavele'ngths's Theiloiigitudinalr slot: divided t-into" two r parts 22 and 32, eachnhavingza lehgthmubstahtially:
  • Figure 4 illustrates a further modification of the: present invention :wherein three antennas are'rstacked terticallyf'in"'layers one-above the other.
  • the ho'llo'w cylindrical conductor "4- 0* thus hasa an overall len'gth 'of :thr'eewavelengths-.
  • a broadcast antenna including a hollow conductive cylinder having a length substantially equal to one wavelength at the operating frequency and having a circumference of the order of one-half wavelength, there being a narrow longitudinal slot along the length of said cylinder and a coaxial transmission line connected to the edges of said slot at a position half way between the ends of said slot and extending longi-' tudinally along said slot inside of said cylinder and out one end of said cylinder.
  • a broadcast antenna including a hollow conductive cylinder having a length substantially equal to one wavelength at the operating frequency and having a circumference of the order of one-half wavelength, there being a narrow longitudinal slot along the length of said cylinder and a coaxial transmission line extending longitudinally from a position half Way between the ends of said slot and along said slot inside of said cylinder and out one end of said cylinder, said coaxial line having an inner conductor extending across said slot and connected to the opposite edge of said slot and said line having an. outer sheath connected along the edge of said slot from one end of said antenna to substantially the midpoint of said slot.
  • a broadcast antenna including a hollow conductive cylinder having a circumference substantially equal to one-half wavelength at the operating frequency and a length equal to a multiple of wavelengths, said cylinder having a number of longitudinal slots spaced a multiple of wavelengths including unity apart along the length of said cylinder in an end to end relationship, each of said slots having a length equal to one wavelength and being closed at each end, a coaxial transmission line connected across the midpoint of each of said slots at the edges thereof and means for connecting each of said transmission lines in a parallel relationship to another transmission line which is adapted to connect said antenna to transducer equipment, said first mentioned transmission lines having the same length and each extending longitudinally along the edge of the slot with which it is associated to one end thereof.
  • a broadcast antenna including a hollow conductive cylinder having a circumference substantially equal to a half wavelength of the operating frequency, an overall length equal to two wavelengths, a pair of narrow longitudinal slots arranged in an end to end relationship along the length of said cylinder, each of said slots having a length lying between three-quarters and one wavelength and being electrically closed at each end, a coaxial transmission lin connected across the midpoint to each of said, slots at the edges thereof and further means for connecting each of said transmission lines in a parallel relationship to a further transmission line adapted to connect said antenna to transducer equipment, said first mentioned transmission lines having the same length and each extending along an edged the slot with which it is associated to one end thereof.
  • a broadcast antenna including a hollow conductive cylinder having a circumference substantially equal to a half wavelength of the operating frequency and a length equal to two wavelengths, a pair of narrow longitudinal slots extending along the length of said cylinder in an end to end relationship, each of said slots having a length substantially equal to one wavelength, said slots being closed at each end, coaxial transmission lines each having an outer sheath and an inner conductor connected across the midpoints of each of said slots at the edges thereof, the inner conductor of one of said lines crossing said slots in an opposite direction from the other and means within said cylinder for connecting said transmission lines in a series relationship to the end of another transmission line.
  • a broadcast antenna including a hollow conductive cylinder having a circumference substantially equal to one-half of the operating wavelength and having a narrow longitudinal slot along the length of said cylinder, inwardly turned flanges along each edge of said slot, conductive means joining said flanges together at points along said slot spaced substantially one wavelength apart and a coaxial transmission line having inner and sheath conductors connected to the edges of said slot at points intermediate said first mentioned points said coaxial transmission line extending along said slot inside said cylinder in conductive relationship thereto and out one end thereof.
  • a broadcast antenna including a conductive member constituted by a conductive surface element arranged in the form of a substantially closed hollow member having a narrow longitudinal slot along the length thereof, said member having a length substantially equal to one wavelength at the operating frequency and a mean circumferential dimension of the order of onehalf wavelength, and a coaxial transmission line connected to the edge of said slot at a position halfway between the ends of said slot and extending longitudinally along said slot inside of said member and out one end thereof.
  • a broadcast antenna including a hollow conductive member in the form of a substantially continuous surface of revolution, said member having a length substantially equal to one wavelength at the operating frequency and having a circumference of the order of one-half wavelength, there being a narrow longitudinal slot along the length of said member and a coaxial transmission line connected to the edge of said slot at a position halfway between the ends of said slot and extending longitudinally along said slot inside of said member and out one end thereof.
  • a broadcast antenna including a hollow conductive cylinder having a length substantially equal to one wavelength at the operating frequency and having a circumference of the order of one-half wavelength, there being a narrow longitudinal lslotialong the length of-saidrcylinflensaid-cylinder having connection-means .thereon to :connect a coaxial transmission line having an linner conductor and .an outer sheath extending: longitudinally from a" position halfway between the-ends 'of fsaid slot and along said slot inside -of-zsaid-cylinder and :out one end o-fsaid cylinder-across said slot, said connection means including rmeans to :connect the outer sheath of said coaxial 'line'alongnone edge of.
  • said slot from one end 'of said antenna to-substantia11 the-midpointrof-saidslot'and theinner conductor of said coaxial: line to the rother edge 'of' said slot across irlomathe end of said outer sheath at substantially thesmidpoint'ofisaidslot.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)
US593152A 1945-05-11 1945-05-11 Broadcast antenna Expired - Lifetime US2513007A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE465085D BE465085A (xx) 1945-05-11
US593152A US2513007A (en) 1945-05-11 1945-05-11 Broadcast antenna
FR926207D FR926207A (fr) 1945-05-11 1946-05-02 Antenne de radio diffusion
GB14267/46A GB635343A (en) 1945-05-11 1946-05-11 Improvements in radio antennas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US593152A US2513007A (en) 1945-05-11 1945-05-11 Broadcast antenna

Publications (1)

Publication Number Publication Date
US2513007A true US2513007A (en) 1950-06-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US593152A Expired - Lifetime US2513007A (en) 1945-05-11 1945-05-11 Broadcast antenna

Country Status (4)

Country Link
US (1) US2513007A (xx)
BE (1) BE465085A (xx)
FR (1) FR926207A (xx)
GB (1) GB635343A (xx)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2575471A (en) * 1950-04-13 1951-11-20 Philco Corp Vehicular antenna system
US2600179A (en) * 1946-02-18 1952-06-10 Alford Andrew Split cylinder antenna
US2625654A (en) * 1946-01-12 1953-01-13 Alford Andrew Slotted cylindrical antenna
US2659002A (en) * 1946-03-29 1953-11-10 Price M Keeler Split truncated cone-antenna
US2660674A (en) * 1948-10-14 1953-11-24 Rca Corp Slotted antenna system
US2665382A (en) * 1947-10-16 1954-01-05 Smith Three slot cylindrical antenna
US2685029A (en) * 1950-05-20 1954-07-27 Rca Corp Compact wide band antenna system
US2712604A (en) * 1951-07-26 1955-07-05 Glenn L Martin Co Antenna assembly with de-icing means
US2747182A (en) * 1953-01-13 1956-05-22 Alford Andrew Antenna
US2755465A (en) * 1949-10-07 1956-07-17 Marconi Wireless Telegraph Co Aerials
US2791769A (en) * 1950-09-27 1957-05-07 Rca Corp Dual slot wide band antenna
US2799017A (en) * 1946-08-31 1957-07-09 Alford Andrew Slotted cylindrical antennas
US2825061A (en) * 1951-11-21 1958-02-25 Gabriel Co Wave radiator
US2895133A (en) * 1956-05-22 1959-07-14 Applic Rech Electronique Wide-band antenna

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2196796A (en) * 1986-10-27 1988-05-05 Jaybeam Limited Antennas and antenna arrays

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1960006A (en) * 1930-12-30 1934-05-22 Telefunken Gmbh Antenna system
US2160053A (en) * 1936-03-03 1939-05-30 Emi Ltd Wireless aerial system
US2175363A (en) * 1938-01-07 1939-10-10 Rca Corp Method of and means for coupling two high frequency circuits
US2206923A (en) * 1934-09-12 1940-07-09 American Telephone & Telegraph Short wave radio system
US2234293A (en) * 1939-09-19 1941-03-11 Rca Corp Antenna system
US2238770A (en) * 1938-03-07 1941-04-15 Emi Ltd High frequency electrical conductor or radiator
US2286179A (en) * 1940-07-10 1942-06-09 Rca Corp Wide band antenna
US2321454A (en) * 1941-11-22 1943-06-08 Rca Corp Multiple section antenna
US2324462A (en) * 1941-11-15 1943-07-13 Gen Electric High frequency antenna system
US2400867A (en) * 1942-06-27 1946-05-21 Rca Corp Antenna
US2414266A (en) * 1942-06-27 1947-01-14 Rca Corp Antenna
US2415094A (en) * 1938-01-17 1947-02-04 Board Radio measurement of distances and velocities
US2433183A (en) * 1945-02-27 1947-12-23 Rca Corp Antenna system

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1960006A (en) * 1930-12-30 1934-05-22 Telefunken Gmbh Antenna system
US2206923A (en) * 1934-09-12 1940-07-09 American Telephone & Telegraph Short wave radio system
US2160053A (en) * 1936-03-03 1939-05-30 Emi Ltd Wireless aerial system
US2175363A (en) * 1938-01-07 1939-10-10 Rca Corp Method of and means for coupling two high frequency circuits
US2415094A (en) * 1938-01-17 1947-02-04 Board Radio measurement of distances and velocities
US2238770A (en) * 1938-03-07 1941-04-15 Emi Ltd High frequency electrical conductor or radiator
US2234293A (en) * 1939-09-19 1941-03-11 Rca Corp Antenna system
US2286179A (en) * 1940-07-10 1942-06-09 Rca Corp Wide band antenna
US2324462A (en) * 1941-11-15 1943-07-13 Gen Electric High frequency antenna system
US2321454A (en) * 1941-11-22 1943-06-08 Rca Corp Multiple section antenna
US2400867A (en) * 1942-06-27 1946-05-21 Rca Corp Antenna
US2414266A (en) * 1942-06-27 1947-01-14 Rca Corp Antenna
US2433183A (en) * 1945-02-27 1947-12-23 Rca Corp Antenna system

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2625654A (en) * 1946-01-12 1953-01-13 Alford Andrew Slotted cylindrical antenna
US2600179A (en) * 1946-02-18 1952-06-10 Alford Andrew Split cylinder antenna
US2659002A (en) * 1946-03-29 1953-11-10 Price M Keeler Split truncated cone-antenna
US2799017A (en) * 1946-08-31 1957-07-09 Alford Andrew Slotted cylindrical antennas
US2665382A (en) * 1947-10-16 1954-01-05 Smith Three slot cylindrical antenna
US2660674A (en) * 1948-10-14 1953-11-24 Rca Corp Slotted antenna system
US2755465A (en) * 1949-10-07 1956-07-17 Marconi Wireless Telegraph Co Aerials
US2575471A (en) * 1950-04-13 1951-11-20 Philco Corp Vehicular antenna system
US2685029A (en) * 1950-05-20 1954-07-27 Rca Corp Compact wide band antenna system
US2791769A (en) * 1950-09-27 1957-05-07 Rca Corp Dual slot wide band antenna
US2712604A (en) * 1951-07-26 1955-07-05 Glenn L Martin Co Antenna assembly with de-icing means
US2825061A (en) * 1951-11-21 1958-02-25 Gabriel Co Wave radiator
US2747182A (en) * 1953-01-13 1956-05-22 Alford Andrew Antenna
US2895133A (en) * 1956-05-22 1959-07-14 Applic Rech Electronique Wide-band antenna

Also Published As

Publication number Publication date
GB635343A (en) 1950-04-05
BE465085A (xx)
FR926207A (fr) 1947-09-25

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