WO1995000980A1 - Antenne du type panneau a deux frequences - Google Patents

Antenne du type panneau a deux frequences Download PDF

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Publication number
WO1995000980A1
WO1995000980A1 PCT/US1994/007144 US9407144W WO9500980A1 WO 1995000980 A1 WO1995000980 A1 WO 1995000980A1 US 9407144 W US9407144 W US 9407144W WO 9500980 A1 WO9500980 A1 WO 9500980A1
Authority
WO
WIPO (PCT)
Prior art keywords
dipoles
frequency
pair
radiating
antenna
Prior art date
Application number
PCT/US1994/007144
Other languages
English (en)
Inventor
Ali R. Mahnad
Original Assignee
Jampro Antennas
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 Jampro Antennas filed Critical Jampro Antennas
Priority to AU73166/94A priority Critical patent/AU668836B2/en
Publication of WO1995000980A1 publication Critical patent/WO1995000980A1/fr

Links

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
    • H01Q21/061—Two dimensional planar arrays
    • H01Q21/062—Two dimensional planar arrays using dipole aerials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements

Definitions

  • the present invention is directed to a dual frequency panel type antenna and more specifically to an antenna especially useful for high definition television (HDTV) .
  • HDMI high definition television
  • HDTV high definition television
  • a radio frequency antenna for radiating a pair of radio frequency signals having first and second frequencies with a ratio of substantially two to one or greater comprising a first pair of radiating elements arranged as a dipole panel antenna having a pattern with nulls and being resonant at the first frequency. Two or more dipoles resonant and radiating at said second frequency are spaced on the panel between the first pair of radiation elements with the second frequency dipoles having a radiation pattern to provide noninterference with the first pair of dipoles.
  • Figure 1 is a block diagram of a generalized transmitter system as it would drive the antenna of the present invention.
  • Figure 2 is a perspective view of a panel antenna system embodying the present invention.
  • Figure 3 is a top view of Figure 2.
  • Figure 4 is a diagrammatic view of Figure 2.
  • Figure 5 is a radio frequency propagation pattern illustrating Figure 5.
  • Figure 6 is a simplified elevational view of Figure 3 taken substantially along the line 5-5 of Figure 3.
  • Figure 7 is a simplified plan view of Figure 5 showing an alternative embodiment.
  • Figure 1 illustrates a proposed HDTV system where "he transmission tower 21 which with its antenna on a vertical support mast 22 will radiate or transmit both an NTSC signal received on the coaxial cable 23 and coupled to the tower and a HDTV signal on the coaxial cable or waveguide 24.
  • the NTSC signal can be either in the low VHF or high VHF range which are 54-88 MHz and 170-230 MHz, respectively.
  • such a signal may be in the UHF band which is 470-800 MHz.
  • the extra HDTV channels will be the UHF channels which were used for spacing.
  • FIG. 1 The remainder of Figure 1 are standard transmitting system blocks. From a television studio 26, one feed extends to an NTSC channel including an exciter 27, visual and aural power amplifiers 28 and a combining diplexer 29 which feeds the coaxial waveguide 23 and connects to the antenna 21, 22.
  • the second channel from the TV studio 26 includes the encoder 31 to convert the information to digital, an upconverter 32, power amplifier 33, and a band pass filter 34 connecting to the HDTV coaxial 24.
  • the HDTV signal as well as being digital is contemplated to be of the spread spectrum type.
  • Figure 2 illustrates one of the four panel antennas 40 which would be mounted on the transmission tower 21. Referring also to Figure 3, it includes a first pair of dipoles 41a, 41b, resonant at a first lower frequency, f 1# (for example, the NTSC frequency) and spaced a half wavelength apart. A second set of smaller dipoles 42a, b and c, are resonant and radiating at a second higher frequency, f 2 . These are all mounted on the panel 40. Then to provide circular polarization, in addition to the larger dipoles 41a, 41b, there are a 90 degree quadrature pair 43a, 43b.
  • f 1# for example, the NTSC frequency
  • Figure 4 illustrates the various dipoles and their physical arrangement on the panel.
  • This includes the dipoles 41a, 41b, being spaced a half wavelength apart along with the quadrature dipoles 43a, 43b.
  • the latter are driven, of course, by the first frequency f at a 90 degree angle compared to 0 degrees for 41a, 41b.
  • the dipoles 42a, 42b, 42c are again arranged a half wavelength apart and the frequency is at least double, or in this case, triple the frequency of f . This provides intermediate space between the first pair of dipoles 41a, 41b.
  • the radiation pattern of the vertical dipoles 42a, 42b, 42c at frequency f 2 is illustrated in Figure 5.
  • This elevation radiation pattern is, of course, formed by three high frequency dipoles spaced one-half wavelength apart.
  • the first null of the elevation pattern of the array falls at an angle which is indicated as 42 degrees. This is by a known radiation formula, the arc sine of 2/3. If there are more than three high frequency elements than in accordance with the above formula, the first null point may decrease to an angle approaching 32 degrees. On the other hand, if only two dipoles are used, the null angle is approximately 45 degrees.
  • any of these null angles will provide a radiation pattern which, as illustrated in Figure 6, will not interfere with the lower frequency dipoles 41a, 41b.
  • the angle is the angle at which the dipoles 41a, 41b are viewed by the array of the three higher frequency dipoles, which in this specific context works out to 45 degrees.
  • the radiation pattern shown in Figure 5 and the null located at 42 degrees the radiation pattern of the higher frequency dipoles will not interfere with the dipoles 41a, 41b. That is the radiation from the three dipole array to the lower frequency dipoles is essentially zero or close to zero.
  • any interfering radiation from the lower frequency dipoles 41a, 41b is also zero or close to zero because the radiation patterns of these two lower frequency dipoles tend to cancel each other.
  • the radiation pattern, with respect to physical interference from the higher frequency dipoles is less than the slant angle which is the angle from the center axis of the panel dipole antenna to either of these first pair of dipoles 41a or 41b.
  • the spacing and excitation of this higher frequency array can be designed to minimize the coupling between this array and the f 1 dipole array.
  • Figure 7 illustrates an alternative embodiment with regard to the dipole array 42a, 42b, 42c where a conductive box 51 surrounds the three-dipole array.
  • Box 51 forms the cavity 52 having the conductive side walls 53 indicated in dashed outline in Figure 6.
  • the height of the side walls is approximately the height of the dipole antennas.
  • the dimension a (the width dimension) of the box 51 determines the radiation patterns' three decibel points. Use of such of the above technique is especially effective if the panel antenna is designed to achieve maximum circulation based on the shape of the cross section of the tower on which generally several panels would be mounted (see Figure 2 which indicates the orientation of one panel) .
  • the invention provides a dual frequency radio antenna where within the same aperture two different frequencies can be accommodated.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

Antenne du type panneau à deux fréquences, dans laquelle les doublets (42a-42c) de fréquence supérieure sont situés sur le panneau entre les doublets de féquence inférieure (41a, 41b, 43a, 43b) et présentent un diagramme de rayonnement permettant d'éviter le brouillage.
PCT/US1994/007144 1993-06-28 1994-06-24 Antenne du type panneau a deux frequences WO1995000980A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU73166/94A AU668836B2 (en) 1993-06-28 1994-06-24 Dual frequency panel antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8336493A 1993-06-28 1993-06-28
US08/083,364 1993-06-28

Publications (1)

Publication Number Publication Date
WO1995000980A1 true WO1995000980A1 (fr) 1995-01-05

Family

ID=22177832

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/007144 WO1995000980A1 (fr) 1993-06-28 1994-06-24 Antenne du type panneau a deux frequences

Country Status (2)

Country Link
AU (1) AU668836B2 (fr)
WO (1) WO1995000980A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1509969A1 (fr) * 2002-03-26 2005-03-02 Andrew Corporation Antenne multi-bande de station de base reglable, a faisceau incline et a double polarisation
CN109755763A (zh) * 2019-01-31 2019-05-14 西南电子技术研究所（中国电子科技集团公司第十研究所） S/Ku双频共口径线极化相控阵扫描天线

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2573914A (en) * 1949-07-30 1951-11-06 Rca Corp Antenna system
GB763870A (en) * 1954-08-25 1956-12-19 Siemens Ag Improvements in or relating to wide-band radiators

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2573914A (en) * 1949-07-30 1951-11-06 Rca Corp Antenna system
GB763870A (en) * 1954-08-25 1956-12-19 Siemens Ag Improvements in or relating to wide-band radiators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1509969A1 (fr) * 2002-03-26 2005-03-02 Andrew Corporation Antenne multi-bande de station de base reglable, a faisceau incline et a double polarisation
EP1509969A4 (fr) * 2002-03-26 2005-08-31 Andrew Corp Antenne multi-bande de station de base reglable, a faisceau incline et a double polarisation
US7405710B2 (en) 2002-03-26 2008-07-29 Andrew Corporation Multiband dual polarized adjustable beamtilt base station antenna
CN109755763A (zh) * 2019-01-31 2019-05-14 西南电子技术研究所（中国电子科技集团公司第十研究所） S/Ku双频共口径线极化相控阵扫描天线

Also Published As

Publication number Publication date
AU7316694A (en) 1995-01-17
AU668836B2 (en) 1996-05-16

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