US3106713A - Slot antenna having short radiating slots and long nonradiating distributed capacitance tuning slot - Google Patents

Slot antenna having short radiating slots and long nonradiating distributed capacitance tuning slot Download PDF

Info

Publication number
US3106713A
US3106713A US253490A US25349063A US3106713A US 3106713 A US3106713 A US 3106713A US 253490 A US253490 A US 253490A US 25349063 A US25349063 A US 25349063A US 3106713 A US3106713 A US 3106713A
Authority
US
United States
Prior art keywords
slot
slots
length
conductor
electromagnetic wave
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
US253490A
Inventor
Murata Hiroshi
Matsushita Masao
Ito Mizuo
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.)
Furukawa Electric Co Ltd
Original Assignee
Furukawa Electric Co Ltd
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 Furukawa Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Application granted granted Critical
Publication of US3106713A publication Critical patent/US3106713A/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
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/203—Leaky coaxial lines

Definitions

  • a tubular conductor is provided on its side surface with a number of slots of suitable Width and length arranged in a longitudinal direction and separated one from another with a desired interval, and the slots are brought into resonance condition in order to radiate the electromagnetic wave from the tube wall.
  • the diameter of the tubular conductor becomes extremely small as compared with the wave length, the feeding impedance at the slots becomes too high to etficiently radiate the electromagnetic wave.
  • the diameter or" the tube has to be large enough to decrease the feeding impedance.
  • the use of the tubular conductor having a diameter greater than that necessary for the electromagnetic wave transmission is extremely uneconomical.
  • the object of the invention is to obviate the above disadvantage and provide a slot antenna which compn'ses a tubular conductor that radiates from its side surface electromagnetic wave most eiiiciently even though the diameter of the conductor becomes smaller than of the wave length.
  • FIG. 1 is a perspective view of a slot antenna embodying the invention
  • FIG. 2 is its cross-sectional View
  • FIG. 3 is a partial sectional view of a coaxial cable embodying the invention.
  • FIGS. 4 and 5 show modified embodiments of a coaxial cable in accordance with the invention.
  • FIGS. 6, 7 and 8 are cross-sectional views of modified slit parts of the coaxial cable according to the invention.
  • FIG. 1 designates a tubular conductor which is provided on its one side surface with a number of A 3,166,713 Patented Get. a, 1963 slots of about /2 of the Wave length of the electromagnetic wave to be transmitted, which are separated one from another with an interval equal to about one wave length in a longitudinal direction. Each slot is connected to a power source 3 to supply a high frequency voltage and excited to radiate the electromagnetic wave in the conventional manner.
  • the tubular conductor 1 is provided at the opposite side with a longitudinal slit 4 which is sufiicien-tly long as compared with the slot 2.
  • the slit 4 provides, in case of a current flowing circumferentially along the tube 1, a circuit having capacitance such as a distributed constant connected in parallel, so that the antenna is brought into a resonance condition even though there exists a relation of D/ 0.12 (where D is the diameter of the tube and A is the wave length of the electromagnetic wave to be transmitted).
  • D is the diameter of the tube
  • A is the wave length of the electromagnetic wave to be transmitted.
  • FIG. 3 shows a coaxial cable embodying the invention having'an outer tubular conductor 1 and a central conductor 5.
  • the tubular conductor 1 is provided on its one side with a number of slots 2 and on the opposite side with a longitudinal slit 4 in the same manner as shown in FIG. 1.
  • the central conductor 5 is supported in the outer tubular conductor 1 by means of insulating discs 6.
  • 7 shows an outer protective sheath.
  • the slots 2 are inclined at an angle 0 with respect to the longitudinal axis.
  • the slots 2 interrupt a current flowing through the tubular conductor '1 in the axial direction, so that a potential difference is produced across each side" edge of the slot 2, which results in radiation in transverse direction of the electromagnetic wave without any coupling element at the slot.
  • the inclination of the slot 2 may suitably be selected within a range of 0-i90 according to the energy of electromagnetic wave to be radiated, but it is generally selected within a range of from 2 to 60.
  • the length of slot 2 is usually made equal to about /2 of the Wave length of electromagnetic wave, but it is not necessarily limited to such value, and may be selected at any length shorter than the wave length.
  • the interval between adjacent slots 2 may be determined in accordance with the electromagnetic energy to be transmitted. case shown in FIG. 1, such interval may be made equal to about one to several wave lengths, while in the case shown in FIG. 2 such interval may be made odd multiple of the A wave length. These intervals are not required to be equal to each other.
  • One of the intervals may be made equal to two wave lengths, while the next interval to 1% 'wave length and the other intervals may be made equal to one wave length.
  • the length of the slit 4 should be selected much longer than the length of the slot 2 on the opposite side. For example, the length of the slit 4 may be made 1.5-2.0 times that of the slot 2. If the interval between the slots 2 is made from 1 to several times the A wave length, then the slit 4- may be made to cover the total length of the tube.
  • FIG. 4 shows another embodiment of the coaxial tubular conductor wherein the slots 2 are alternately sloped in opposite directions for the angle of +0 and 0 with the longitudinal axis.
  • the internal between adjacent slots 2 is made odd multiple of the /2 wave length of the electromagnetic wave to be transmitted.
  • the electromagnetic wave can be radiated outwards from the slots in a similar manner to that in the case of FIG. 3.
  • FIG. 5 shows a further embodiment wherein the slots 2 consists of two portions 8 parallel with the longitudinal axis of the tube connected by :an intermediate inclined portion 9. A number of such slots 2 are formed on one side In the of the conductor 1 at a suitable interval, while the slit 4 is formed on the opposite side in the same manner as in the cases of 'FIGS. 1 to 4.
  • FIGS. 6 to 8 represent modifications of the slit 4 each edge of which is capacitively coupled in order to decrease the feeding impedance at the slots.
  • a :metal plate 10 is attached to each edge 11 of the slit 4 in parallel, then the electrostatic capacity is increased.
  • edges 11 are overlapped one upon another and a dielectric piece 12 is inserted between the over-lapping edges 11.
  • a metal strip 13 is attached to the edges 11 of the slit 4 with a spacer 12 made of dielectric material.
  • the electrostatic capacity at the slit is increased and the feeding impedance at the slots is decreased, which results in an increase of the radiation energy of the electromagnetic wave even though the diameter of the tubular conductor is small.
  • the invention provides a slot antenna comprising a tubular conductor which is provided on its one side 'With short slots and on the opposite side with a long longitudinal slit, and has advantages that the feeding impedance at the slots can be decreased even if the diameter of the tubular conductor is made smaller than the wave length of the electromagnetic wave to be transmitted, thereby eificiently radiating the electromagnetic wave, contrary to the conventional slot antenna provided with slots alone.
  • the invention has a particularly noteworthy advantage in that when it is applied to the outer conductor of a conventional coaxial cable used as the guided line in a tunnel, a valley, etc. Where the electric wave cannot reach, UHF and VHF communications with a moving station can be effected with highly eflicient results.
  • a slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromag netic wave to be transmitted and a slit formed on the opposite side of the tubular conductor in a longitudinal direction and having a length longer than that of the slot.
  • a slot antenna which comprises a coaxial conductor through the outer tubular conductor, a number of slots formed on one side of said tubular conductor and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted and a slit formed on the opposite side of the conductor in the longitudinal direction and having a length longer than that of the slot.
  • a slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor and inclined at an angle with a longitudinal axis and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted and a slit formed on the opposite side of the conductor in the longitudinal direction and having a length longer than that of the slot.
  • a slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor, each inclined with a longitudinal axis alternately at angles +6 and 0 and separated with an interval which is about odd multiple of /2 Wave length of the electromagnetic wave to be transmitted, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted and a slit formed on the 0pposite side of the conductor and having a length longer than that of the slot.
  • a slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor and each consisting of portions in parallel with a longitudinal direction and a sloped portion interconnecting said parallel portions and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted an a slit formed on the opposite side of the conductor in the longitudinal direction and having a length longer than that of the slot.
  • a slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted and a slit formed on the opposite side of the conductor and having a length longer than that of the slot, each edge of said slit being capaciti-vely coupled.

Landscapes

  • Waveguide Aerials (AREA)

Description

1963 HlROSHl MURATA ETAL 3,106,713
SLOT ANTENNA HAVING SHORT RADIATING SLOTS AND LONG NONRADIATING DISTRIBUTED CAPACITANCE TUNING SLOT Filed Jan. 25, 1963 INVENTORS Hires/n Nurafa Masao Maisqshiia M224 0 Ito M w m+M ATTORNEYS United States Patent 3,106,713 SLOT ANTENNA HAVING SHORT RADIATING SLOTS AND LONG N ONRADIATING DISTRIB- UTED CAPACITANCE TUNING SLOT Hiroshi Murata, Yokohama City, Masao Matsushita, Hiratsuka City, and Mizuo Ito, Yokohama City, Japan, assignors to The Furukawa Electric Company Limited, Tokyo, Japan, a corporation of Japan Filed Jan. 23, 1963, Ser. No. 253,490 Claims priority, application Japan Jan. 26, 1962 6 Claims. (Cl. 343770) The present invention relates to a slot antenna which comprises a tubular conductor for radiating from its side surface electromagnetic wave.
In general, in Wireless communication with a moving station such as automobile, train, etc., when the station passes through a valley, tunnel, etc., the electromagnetic wave is interrupted and cannot arrive at the station, thereby interrupting the communication. In such a case, therefore, it is necessary to provide the valley, tunnel, etc. with such a guided line or lines to be coupled with the antenna of the moving station as will transmit the electromagnetic wave to continue the communicamm.
For such purpose, use has been made of two parallel conductors or a leakage coaxial system which comprises a coaxial cable having an outer conductor which is provided in its longitudinal direction with a continuous slot. It is impossible, however, to efficiently radiate the electromagnetic wave in a direction at right angles with the line since such system is influenced by other objects such as line supporters or tunnel wall near by, which fact results in an increase of the transmission loss of the line.
In order to obviate the above disadvantage a tubular conductor is provided on its side surface with a number of slots of suitable Width and length arranged in a longitudinal direction and separated one from another with a desired interval, and the slots are brought into resonance condition in order to radiate the electromagnetic wave from the tube wall. In this case, if the diameter of the tubular conductor becomes extremely small as compared with the wave length, the feeding impedance at the slots becomes too high to etficiently radiate the electromagnetic wave. In other words, since it is necessary to satisfy a condition of D/ 0.12 (where D is the diameter of the tube and A is the wave length), the diameter or" the tube has to be large enough to decrease the feeding impedance. But, the use of the tubular conductor having a diameter greater than that necessary for the electromagnetic wave transmission is extremely uneconomical.
The object of the invention is to obviate the above disadvantage and provide a slot antenna which compn'ses a tubular conductor that radiates from its side surface electromagnetic wave most eiiiciently even though the diameter of the conductor becomes smaller than of the wave length.
For a better understanding of the invention, reference is made to the accompanying drawings, of which FIG. 1 is a perspective view of a slot antenna embodying the invention;
FIG. 2 is its cross-sectional View;
FIG. 3 is a partial sectional view of a coaxial cable embodying the invention;
FIGS. 4 and 5 show modified embodiments of a coaxial cable in accordance with the invention; and
FIGS. 6, 7 and 8 are cross-sectional views of modified slit parts of the coaxial cable according to the invention.
In FIG. 1, 1 designates a tubular conductor which is provided on its one side surface with a number of A 3,166,713 Patented Get. a, 1963 slots of about /2 of the Wave length of the electromagnetic wave to be transmitted, which are separated one from another with an interval equal to about one wave length in a longitudinal direction. Each slot is connected to a power source 3 to supply a high frequency voltage and excited to radiate the electromagnetic wave in the conventional manner. In accordance with the invention, the tubular conductor 1 is provided at the opposite side with a longitudinal slit 4 which is sufiicien-tly long as compared with the slot 2. The slit 4 provides, in case of a current flowing circumferentially along the tube 1, a circuit having capacitance such as a distributed constant connected in parallel, so that the antenna is brought into a resonance condition even though there exists a relation of D/ 0.12 (where D is the diameter of the tube and A is the wave length of the electromagnetic wave to be transmitted). Thus, the feeding impedance of the slot 2 is decreased and it is possible to elficiently radiate the electromagnetic wave.
FIG. 3 shows a coaxial cable embodying the invention having'an outer tubular conductor 1 and a central conductor 5. The tubular conductor 1 is provided on its one side with a number of slots 2 and on the opposite side with a longitudinal slit 4 in the same manner as shown in FIG. 1. The central conductor 5 is supported in the outer tubular conductor 1 by means of insulating discs 6. 7 shows an outer protective sheath. In this embodiment, the slots 2 are inclined at an angle 0 with respect to the longitudinal axis. Thus, the slots 2 interrupt a current flowing through the tubular conductor '1 in the axial direction, so that a potential difference is produced across each side" edge of the slot 2, which results in radiation in transverse direction of the electromagnetic wave without any coupling element at the slot. The inclination of the slot 2 may suitably be selected within a range of 0-i90 according to the energy of electromagnetic wave to be radiated, but it is generally selected within a range of from 2 to 60. In the embodiments shown in FIGS. 1 and 2, the length of slot 2 is usually made equal to about /2 of the Wave length of electromagnetic wave, but it is not necessarily limited to such value, and may be selected at any length shorter than the wave length. The interval between adjacent slots 2 may be determined in accordance with the electromagnetic energy to be transmitted. case shown in FIG. 1, such interval may be made equal to about one to several wave lengths, while in the case shown in FIG. 2 such interval may be made odd multiple of the A wave length. These intervals are not required to be equal to each other. One of the intervals may be made equal to two wave lengths, while the next interval to 1% 'wave length and the other intervals may be made equal to one wave length. The length of the slit 4 should be selected much longer than the length of the slot 2 on the opposite side. For example, the length of the slit 4 may be made 1.5-2.0 times that of the slot 2. If the interval between the slots 2 is made from 1 to several times the A wave length, then the slit 4- may be made to cover the total length of the tube.
FIG. 4 shows another embodiment of the coaxial tubular conductor wherein the slots 2 are alternately sloped in opposite directions for the angle of +0 and 0 with the longitudinal axis. In this case, the internal between adjacent slots 2 is made odd multiple of the /2 wave length of the electromagnetic wave to be transmitted. Thus, the electromagnetic wave can be radiated outwards from the slots in a similar manner to that in the case of FIG. 3.
FIG. 5 shows a further embodiment wherein the slots 2 consists of two portions 8 parallel with the longitudinal axis of the tube connected by :an intermediate inclined portion 9. A number of such slots 2 are formed on one side In the of the conductor 1 at a suitable interval, while the slit 4 is formed on the opposite side in the same manner as in the cases of 'FIGS. 1 to 4.
FIGS. 6 to 8 represent modifications of the slit 4 each edge of which is capacitively coupled in order to decrease the feeding impedance at the slots. In case of FIG. 6, a :metal plate 10 is attached to each edge 11 of the slit 4 in parallel, then the electrostatic capacity is increased. In case of FIG. 7, edges 11 are overlapped one upon another and a dielectric piece 12 is inserted between the over-lapping edges 11. In the embodiment shown in FIG. 8, a metal strip 13 is attached to the edges 11 of the slit 4 with a spacer 12 made of dielectric material. In any case, the electrostatic capacity at the slit is increased and the feeding impedance at the slots is decreased, which results in an increase of the radiation energy of the electromagnetic wave even though the diameter of the tubular conductor is small.
As above mentioned, the invention provides a slot antenna comprising a tubular conductor which is provided on its one side 'With short slots and on the opposite side with a long longitudinal slit, and has advantages that the feeding impedance at the slots can be decreased even if the diameter of the tubular conductor is made smaller than the wave length of the electromagnetic wave to be transmitted, thereby eificiently radiating the electromagnetic wave, contrary to the conventional slot antenna provided with slots alone. The invention has a particularly noteworthy advantage in that when it is applied to the outer conductor of a conventional coaxial cable used as the guided line in a tunnel, a valley, etc. Where the electric wave cannot reach, UHF and VHF communications with a moving station can be effected with highly eflicient results.
What we claim is:
1. A slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromag netic wave to be transmitted and a slit formed on the opposite side of the tubular conductor in a longitudinal direction and having a length longer than that of the slot.
2. A slot antenna which comprises a coaxial conductor through the outer tubular conductor, a number of slots formed on one side of said tubular conductor and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted and a slit formed on the opposite side of the conductor in the longitudinal direction and having a length longer than that of the slot.
3. A slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor and inclined at an angle with a longitudinal axis and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted and a slit formed on the opposite side of the conductor in the longitudinal direction and having a length longer than that of the slot.
4. A slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor, each inclined with a longitudinal axis alternately at angles +6 and 0 and separated with an interval which is about odd multiple of /2 Wave length of the electromagnetic wave to be transmitted, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted and a slit formed on the 0pposite side of the conductor and having a length longer than that of the slot.
5. A slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor and each consisting of portions in parallel with a longitudinal direction and a sloped portion interconnecting said parallel portions and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted an a slit formed on the opposite side of the conductor in the longitudinal direction and having a length longer than that of the slot.
6. A slot antenna which comprises a tubular conductor, a number of slots formed on one side of the conductor and separated with a desired interval, each of said slots having a length shorter than the wave length of the electromagnetic wave to be transmitted and a slit formed on the opposite side of the conductor and having a length longer than that of the slot, each edge of said slit being capaciti-vely coupled.
No references cited.

Claims (1)

1. A SLOT ANTENNA WHICH COMPRISES A TUBULAR CONDUCTOR, A NUMBER OF SLOTS FORMED ON ONE SIDE OF THE CONDUCTOR AND SEPARATED WITH A DESIRED INTERVAL, EACH OF SAID SLOTS HAVING A LENGTH SHORTER THAN THE WAVE LENGTH OF THE ELECTROMAGNETIC WAVE TO BE TRANSMITTED AND A SLIT FORMED ON THE OPPOSITE SIDE OF THE TUBULAR CONDUCTOR IN A LONGITUDINAL DIRECTION AND HAVING A LENGTH LONGER THAN THAT OF THE SLOT.
US253490A 1962-01-26 1963-01-23 Slot antenna having short radiating slots and long nonradiating distributed capacitance tuning slot Expired - Lifetime US3106713A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3106713X 1962-01-26

Publications (1)

Publication Number Publication Date
US3106713A true US3106713A (en) 1963-10-08

Family

ID=18008053

Family Applications (1)

Application Number Title Priority Date Filing Date
US253490A Expired - Lifetime US3106713A (en) 1962-01-26 1963-01-23 Slot antenna having short radiating slots and long nonradiating distributed capacitance tuning slot

Country Status (1)

Country Link
US (1) US3106713A (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183511A (en) * 1963-03-28 1965-05-11 Hughes Aircraft Co Broadband waveguide slot radiator with mutually coupled slots of different perimeters and orientation
US3417400A (en) * 1966-04-25 1968-12-17 Administrator Of The Nat Acron Triaxial antenna
US3696433A (en) * 1970-07-17 1972-10-03 Teledyne Ryan Aeronautical Co Resonant slot antenna structure
US3781725A (en) * 1972-05-04 1973-12-25 Sumitomo Electric Industries Leaky coaxial cable
US3795915A (en) * 1972-10-20 1974-03-05 Sumitomo Electric Industries Leaky coaxial cable
US3810186A (en) * 1968-01-31 1974-05-07 Sumitomo Electric Industries Leaky coaxial cable
DE2854133A1 (en) * 1977-12-19 1979-06-21 Int Standard Electric Corp LEVEL ANTENNA GROUP
US4907008A (en) * 1988-04-01 1990-03-06 Andrew Corporation Antenna for transmitting circularly polarized television signals
JPH0341804A (en) * 1989-07-07 1991-02-22 Shinko Seisakusho:Kk Travelling wave feeding type coaxial slot antenna and transmission and reception system
DE3931752A1 (en) * 1989-09-20 1991-04-04 Beam Co COAXIAL SLOT ANTENNA
WO1994009530A1 (en) * 1992-10-22 1994-04-28 Trilogy Communications, Inc. A radiating coaxial cable and a method for making the same
EP0643438A1 (en) * 1993-09-14 1995-03-15 KABEL RHEYDT Aktiengesellschaft Leaky coaxial cable for radio frequency
FR2732820A1 (en) * 1995-04-07 1996-10-11 Inst Scient De Service Public Radiating high-frequency line for radio communication with axially moving object in tunnel, underground railway and building
US6246005B1 (en) * 1997-09-03 2001-06-12 Alcatel Radiating coaxial cable
US6480163B1 (en) * 1999-12-16 2002-11-12 Andrew Corporation Radiating coaxial cable having helically diposed slots and radio communication system using same
US6831231B2 (en) * 2001-12-05 2004-12-14 Times Microwave Systems, Division Of Smiths Aerospace, Incorporated Coaxial cable with flat outer conductor
US20080029299A1 (en) * 2006-08-07 2008-02-07 Sony Corporation Cable device
EP2166613A1 (en) * 2007-07-05 2010-03-24 Mitsubishi Electric Corporation Transmission line converter
US20140015725A1 (en) * 2011-03-25 2014-01-16 Technische Universitat Braunschweig Method and arrangement for modeling antenna emission characteristics
US20150029069A1 (en) * 2013-07-25 2015-01-29 Astrium Gmbh Waveguide Radiator, Array Antenna Radiator and Synthetic Aperture Radar System
US9598945B2 (en) 2013-03-15 2017-03-21 Chevron U.S.A. Inc. System for extraction of hydrocarbons underground
US20170373384A1 (en) * 2016-06-24 2017-12-28 Ford Global Technologies, Llc Multiple orientation antenna for vehicle communication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3183511A (en) * 1963-03-28 1965-05-11 Hughes Aircraft Co Broadband waveguide slot radiator with mutually coupled slots of different perimeters and orientation
US3417400A (en) * 1966-04-25 1968-12-17 Administrator Of The Nat Acron Triaxial antenna
US3810186A (en) * 1968-01-31 1974-05-07 Sumitomo Electric Industries Leaky coaxial cable
US3696433A (en) * 1970-07-17 1972-10-03 Teledyne Ryan Aeronautical Co Resonant slot antenna structure
US3781725A (en) * 1972-05-04 1973-12-25 Sumitomo Electric Industries Leaky coaxial cable
US3795915A (en) * 1972-10-20 1974-03-05 Sumitomo Electric Industries Leaky coaxial cable
DE2854133A1 (en) * 1977-12-19 1979-06-21 Int Standard Electric Corp LEVEL ANTENNA GROUP
US4907008A (en) * 1988-04-01 1990-03-06 Andrew Corporation Antenna for transmitting circularly polarized television signals
JPH0341804A (en) * 1989-07-07 1991-02-22 Shinko Seisakusho:Kk Travelling wave feeding type coaxial slot antenna and transmission and reception system
JP2641944B2 (en) 1989-07-07 1997-08-20 株式会社 新興製作所 Traveling wave fed coaxial slot antenna
US5546096A (en) * 1989-09-13 1996-08-13 Beam Company Limited Traveling-wave feeder type coaxial slot antenna
DE3931752A1 (en) * 1989-09-20 1991-04-04 Beam Co COAXIAL SLOT ANTENNA
WO1994009530A1 (en) * 1992-10-22 1994-04-28 Trilogy Communications, Inc. A radiating coaxial cable and a method for making the same
US5543000A (en) * 1992-10-22 1996-08-06 Trilogy Communications, Inc., Method of forming radiating coaxial cable
US5339058A (en) * 1992-10-22 1994-08-16 Trilogy Communications, Inc. Radiating coaxial cable
TR27801A (en) * 1993-09-14 1995-08-29 Rheydt Kabelwerk Ag Reflective, hemexene high frequency cable.
US5467066A (en) * 1993-09-14 1995-11-14 Kabel Rheydt Aktiengesellschaft Radiating high-frequency coaxial cable
EP0643438A1 (en) * 1993-09-14 1995-03-15 KABEL RHEYDT Aktiengesellschaft Leaky coaxial cable for radio frequency
FR2732820A1 (en) * 1995-04-07 1996-10-11 Inst Scient De Service Public Radiating high-frequency line for radio communication with axially moving object in tunnel, underground railway and building
BE1010528A5 (en) * 1995-04-07 1998-10-06 Inst Scient De Service Public Online high frequency radiant.
US6246005B1 (en) * 1997-09-03 2001-06-12 Alcatel Radiating coaxial cable
US6480163B1 (en) * 1999-12-16 2002-11-12 Andrew Corporation Radiating coaxial cable having helically diposed slots and radio communication system using same
US6831231B2 (en) * 2001-12-05 2004-12-14 Times Microwave Systems, Division Of Smiths Aerospace, Incorporated Coaxial cable with flat outer conductor
US7700882B2 (en) * 2006-08-07 2010-04-20 Sony Corporation Cable device
US20080029299A1 (en) * 2006-08-07 2008-02-07 Sony Corporation Cable device
EP2166613A1 (en) * 2007-07-05 2010-03-24 Mitsubishi Electric Corporation Transmission line converter
US20100176894A1 (en) * 2007-07-05 2010-07-15 Mitsubishi Electric Corporation Transmission line converter
EP2166613A4 (en) * 2007-07-05 2010-10-06 Mitsubishi Electric Corp Transmission line converter
US8169274B2 (en) * 2007-07-05 2012-05-01 Mitsubishi Electric Corporation Transmission line converter using oblique coupling slots disposed in the narrow wall of a rectangular waveguide
US20140015725A1 (en) * 2011-03-25 2014-01-16 Technische Universitat Braunschweig Method and arrangement for modeling antenna emission characteristics
US9413074B2 (en) * 2011-03-25 2016-08-09 Technische Universitat Braunshweig Method and arrangement for modeling antenna emission characteristics
US9598945B2 (en) 2013-03-15 2017-03-21 Chevron U.S.A. Inc. System for extraction of hydrocarbons underground
US20150029069A1 (en) * 2013-07-25 2015-01-29 Astrium Gmbh Waveguide Radiator, Array Antenna Radiator and Synthetic Aperture Radar System
US10651560B2 (en) * 2013-07-25 2020-05-12 Airbus Ds Gmbh Waveguide radiator, array antenna radiator and synthetic aperture radar system
US20170373384A1 (en) * 2016-06-24 2017-12-28 Ford Global Technologies, Llc Multiple orientation antenna for vehicle communication
US10439275B2 (en) * 2016-06-24 2019-10-08 Ford Global Technologies, Llc Multiple orientation antenna for vehicle communication

Similar Documents

Publication Publication Date Title
US3106713A (en) Slot antenna having short radiating slots and long nonradiating distributed capacitance tuning slot
US2207845A (en) Propagation of waves in a wave guide
US4149170A (en) Multiport cable choke
US2947987A (en) Antenna decoupling arrangement
US2848696A (en) Electromagnetic wave transmission
US2658143A (en) Ultrahigh-frequency broadcast antenna system
US2637775A (en) Coupling of a helical conductor to a wave guide
US3576578A (en) Dipole antenna in which one radiating element is formed by outer conductors of two distinct transmission lines having different characteristic impedances
US3039099A (en) Linearly polarized spiral antenna system
US2848695A (en) Electromagnetic wave transmission
US2981947A (en) Coupling device for slot antenna
US2127088A (en) Feeder and the like for electric currents of high frequency
US6246005B1 (en) Radiating coaxial cable
US2644090A (en) Recessed slot antenna
US2820220A (en) Slot aerials
US2950454A (en) Helix wave guide
US6292072B1 (en) Radiating coaxial cable having groups of spaced apertures for generating a surface wave at a low frequencies and a combination of surface and radiated waves at higher frequencies
US3020498A (en) Coupled waveguides
US8809683B2 (en) Leaky coaxial cable
US3550145A (en) Manipole broadband antenna
US3541564A (en) Multiple channel zig-zag antenna array
US3241148A (en) End loaded planar spiral antenna
US3101474A (en) Log periodic type antenna mounted on ground plane and fed by tapered feed
US3002189A (en) Three conductor planar antenna
US3949329A (en) Radiating transmission lines