WO2001063697A1 - An antenna - Google Patents

An antenna Download PDF

Info

Publication number
WO2001063697A1
WO2001063697A1 PCT/IB2001/000242 IB0100242W WO0163697A1 WO 2001063697 A1 WO2001063697 A1 WO 2001063697A1 IB 0100242 W IB0100242 W IB 0100242W WO 0163697 A1 WO0163697 A1 WO 0163697A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
elements
active
boom
axis
Prior art date
Application number
PCT/IB2001/000242
Other languages
French (fr)
Inventor
Anthony Rabie
Original Assignee
Anthony Rabie
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 Anthony Rabie filed Critical Anthony Rabie
Priority to AU2001237654A priority Critical patent/AU2001237654A1/en
Publication of WO2001063697A1 publication Critical patent/WO2001063697A1/en

Links

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
    • H01Q19/28—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 a secondary device in the form of two or more substantially straight conductive elements
    • H01Q19/30—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 a secondary device in the form of two or more substantially straight conductive elements the primary active element being centre-fed and substantially straight, e.g. Yagi antenna
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength

Definitions

  • This invention relates to an antenna, more particularly, but not exclusively, to a television antenna
  • antennae for receiving television signals All antennae have at least one active element, which is connected to the receiver or television set
  • the active elements are often stand-alone units, sometimes referred to as "bunny ears"
  • External antennae usually have additional reflector and carrier elements associated therewith, which may be active elements (i e they are electrically connected to the receiver) or may be passive elements (i e they are electrically insulated from the receiver) All of the antenna elements are commonly carried on a boom mounted to a pole or other structure Generally, the boom is of an electrically conductive material and is grounded The carrier and reflector elements usually enhance the performance of the antenna
  • active elements are in the form of rods which may be telescopically extendible, or elongate loops
  • an antenna which includes an active antenna element having a generally polygonal-shaped lobe with other than four sides
  • the antenna includes a pair of like active antenna elements arranged symmetrically about an antenna axis
  • the sides of the lobes of the active antenna elements may be substantially equal in length
  • the lobes of the active antenna elements may be generally triangular
  • the lobes of the active antenna elements may be generally hexagonal
  • the antenna may have a coaxial antenna lead
  • One of the active antenna elements may be connected to an inner conductor of the coaxial antenna lead and the other of the active antenna elements may be grounded
  • the antenna may include an inductor, the grounded active antenna element being grounded via the inductor
  • the antenna may further include an elongate antenna boom, a longitudinal axis of which defines the antenna axis, the active antenna elements being mounted on the boom transversely thereto and at least one carrier element may be mounted on the boom transversely thereto
  • the antenna may include at least one reflector element mounted on the boom in a plane generally perpendicular to the antenna axis
  • an antenna which includes an elongate antenna boom, a longitudinal axis of which defines an antenna axis, a plurality of carrier elements mounted on the boom transversely thereto to form an array, a plurality of reflector elements mounted on the boom in a plane generally perpendicular to the antenna axis to form an array, a pair of like active antenna elements arranged symmetrically about the antenna axis and mounted on the boom transversely thereto, one of the active antenna elements being connected to an inner conductor of a coaxial antenna lead and the other of the active antenna elements being grounded via an inductor, and in which each antenna element has a polygonal-shaped lobe with other than four sides, the sides being of substantially the same length and the value of the inductance of the inductor when expressed in mil henrys being about the same as the length of a side of the active antenna elements when expressed in millimeters
  • Figure 1 shows a perspective view of an antenna in accordance with the invention
  • Figure 2 shows a part sectional elevation of part of the antenna of Figure 1
  • a television antenna (1 ) in accordance with the invention is shown in Figure 1
  • the antenna (1 ) has a boom (2) secured to an upright pole (3) by means of a U- bolt (4)
  • the boom (2) defines an antenna axis and a pair of active antenna elements (5) having lobes (6), (7) is secured to the boom (3) intermediate its ends (8), (9) and transversely thereto
  • the antenna (1 ) has a reflector (10), comprising an array of reflector elements (dipoles) (11 ) arranged in a plane perpendicular to the boom (2), at the end (9) thereof
  • a plurality of carrier elements (dipoles) (12) extend intermediate the active elements (5) and end (8) of the boom (2) to form an array
  • the carrier elements (12) and reflector elements (1 1 ) are active elements and are directly electrically connected to the boom, which is conductive, and the active elements (5), and are not insulated therefrom
  • Each lobe (6), (7) of the active elements (5) is constructed from aluminium tubing bent to be hexagonal in shape, sides (13) of the hexagon being of equal length In this embodiment, each side is approximately 100 mm long Free ends (15), (16) of the tubing used for the respective lobes (6), (7) extend parallel to each other away from the hexagonal lobe (6), (7)
  • a coaxial cable (25), providing an antenna lead, is connected to a television set (not shown) and extends along the pole (3) terminating in the box (20)
  • a quick coupling, shown in Figure 2 allows the inner conductor (30) of the coaxial antenna lead (25) to be connected to one lobe (6) and the outer braiding (31 ) to be connected to the other lobe (7)
  • the outer braiding (31 ) is also connected via a 100 mH inductor (32) to the boom (2) in this way grounding the lobe (7)
  • a bracket (34) is provided which extends upwardly from the surface of the box (21 ) to which it is secured
  • a pin (35) extends normally from the bracket (34) and is shaped to be insertable centrally into the end of the coaxial cable (25) to abut the inner conductor (30)
  • a pair of spikes (36) are spaced apart from the bracket (34) and shaped to pierce the outer insulation (37) of the coaxial cable (25) and to reach the outer braid (31 ) but not the inner conductor (30)
  • a clamp (38) is securable over the coaxial cable (25) adjacent to the spikes (36) to force the antenna cable (25) onto the spikes when secured in position
  • the coupling shown provides a quick and effective means for securing the coaxial cable (25) in position without the need for stripping of insulating layers
  • the bracket (34) is simply connected to the lobe (6) by a length of insulated wire and the spikes (36) are similarly connected to the lobe (7).
  • the active elements (5) have been found to provide improved reception of television signals in the UHF, VHF and VLF range.
  • the active elements (5) has also been found to be effective when used as a stand-alone antenna in indoor applications.
  • the active elements further functions well when retrofitted to existing antennae.
  • the active elements (5) may have three or more sides and need not be constructed of tubing or rods, but could be cut from a metal plate.
  • the quick coupling use for the coaxial cable could have any convenient configuration.

Abstract

An antenna includes an active antenna element having a generally polygonal-shaped lobe with other than four sides.

Description

AN ANTENNA
FIELD OF THE INVENTION
This invention relates to an antenna, more particularly, but not exclusively, to a television antenna
BACKGROUND TO THE INVENTION
Many different forms of antenna exist for receiving television signals All antennae have at least one active element, which is connected to the receiver or television set For internal antennae (i e antennae used indoors), the active elements are often stand-alone units, sometimes referred to as "bunny ears"
External antennae usually have additional reflector and carrier elements associated therewith, which may be active elements (i e they are electrically connected to the receiver) or may be passive elements (i e they are electrically insulated from the receiver) All of the antenna elements are commonly carried on a boom mounted to a pole or other structure Generally, the boom is of an electrically conductive material and is grounded The carrier and reflector elements usually enhance the performance of the antenna
For the most part, active elements are in the form of rods which may be telescopically extendible, or elongate loops
OBJECT OF THE INVENTION
it is the object of this invention to provide an antenna having a particular active element to enhance the performance of the antenna SUMMARY OF THE INVENTION
According to a first aspect of the invention there is provided an antenna which includes an active antenna element having a generally polygonal-shaped lobe with other than four sides
In a preferred embodiment of the invention, the antenna includes a pair of like active antenna elements arranged symmetrically about an antenna axis
The sides of the lobes of the active antenna elements may be substantially equal in length In particular, the lobes of the active antenna elements may be generally triangular Instead, the lobes of the active antenna elements may be generally hexagonal
The antenna may have a coaxial antenna lead One of the active antenna elements may be connected to an inner conductor of the coaxial antenna lead and the other of the active antenna elements may be grounded Then, the antenna may include an inductor, the grounded active antenna element being grounded via the inductor
The antenna may further include an elongate antenna boom, a longitudinal axis of which defines the antenna axis, the active antenna elements being mounted on the boom transversely thereto and at least one carrier element may be mounted on the boom transversely thereto
Still further, the antenna may include at least one reflector element mounted on the boom in a plane generally perpendicular to the antenna axis
According to a further aspect of the invention there is provided an antenna which includes an elongate antenna boom, a longitudinal axis of which defines an antenna axis, a plurality of carrier elements mounted on the boom transversely thereto to form an array, a plurality of reflector elements mounted on the boom in a plane generally perpendicular to the antenna axis to form an array, a pair of like active antenna elements arranged symmetrically about the antenna axis and mounted on the boom transversely thereto, one of the active antenna elements being connected to an inner conductor of a coaxial antenna lead and the other of the active antenna elements being grounded via an inductor, and in which each antenna element has a polygonal-shaped lobe with other than four sides, the sides being of substantially the same length and the value of the inductance of the inductor when expressed in mil henrys being about the same as the length of a side of the active antenna elements when expressed in millimeters
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is now described, by way of example, with reference to the accompanying diagrammatic drawings
In the drawings
Figure 1 shows a perspective view of an antenna in accordance with the invention, and Figure 2 shows a part sectional elevation of part of the antenna of Figure 1
DETAILED DESCRIPTION WITH REFERENCE TO THE DRAWINGS
A television antenna (1 ) in accordance with the invention is shown in Figure 1 The antenna (1 ) has a boom (2) secured to an upright pole (3) by means of a U- bolt (4) The boom (2) defines an antenna axis and a pair of active antenna elements (5) having lobes (6), (7) is secured to the boom (3) intermediate its ends (8), (9) and transversely thereto The antenna (1 ) has a reflector (10), comprising an array of reflector elements (dipoles) (11 ) arranged in a plane perpendicular to the boom (2), at the end (9) thereof A plurality of carrier elements (dipoles) (12) extend intermediate the active elements (5) and end (8) of the boom (2) to form an array The carrier elements (12) and reflector elements (1 1 ) are active elements and are directly electrically connected to the boom, which is conductive, and the active elements (5), and are not insulated therefrom
Each lobe (6), (7) of the active elements (5) is constructed from aluminium tubing bent to be hexagonal in shape, sides (13) of the hexagon being of equal length In this embodiment, each side is approximately 100 mm long Free ends (15), (16) of the tubing used for the respective lobes (6), (7) extend parallel to each other away from the hexagonal lobe (6), (7)
The free ends (15), (16) of the lobes (6), (7) extend through the sides of a connection box (20) secured to the boom (2) and are secured by clamps (21 ), (22) to the box (20) A coaxial cable (25), providing an antenna lead, is connected to a television set (not shown) and extends along the pole (3) terminating in the box (20) A quick coupling, shown in Figure 2, allows the inner conductor (30) of the coaxial antenna lead (25) to be connected to one lobe (6) and the outer braiding (31 ) to be connected to the other lobe (7) The outer braiding (31 ) is also connected via a 100 mH inductor (32) to the boom (2) in this way grounding the lobe (7)
As shown more clearly in Figure 2, a bracket (34) is provided which extends upwardly from the surface of the box (21 ) to which it is secured A pin (35) extends normally from the bracket (34) and is shaped to be insertable centrally into the end of the coaxial cable (25) to abut the inner conductor (30) A pair of spikes (36) are spaced apart from the bracket (34) and shaped to pierce the outer insulation (37) of the coaxial cable (25) and to reach the outer braid (31 ) but not the inner conductor (30) A clamp (38) is securable over the coaxial cable (25) adjacent to the spikes (36) to force the antenna cable (25) onto the spikes when secured in position
The coupling shown provides a quick and effective means for securing the coaxial cable (25) in position without the need for stripping of insulating layers The bracket (34) is simply connected to the lobe (6) by a length of insulated wire and the spikes (36) are similarly connected to the lobe (7).
The active elements (5) have been found to provide improved reception of television signals in the UHF, VHF and VLF range. The active elements (5) has also been found to be effective when used as a stand-alone antenna in indoor applications. The active elements further functions well when retrofitted to existing antennae.
It will be appreciated, however, that many other embodiments of an antenna exist which fall within the scope of the invention. For example, the active elements (5) may have three or more sides and need not be constructed of tubing or rods, but could be cut from a metal plate.
Also, the quick coupling use for the coaxial cable could have any convenient configuration.

Claims

1 An antenna which includes an active antenna element having a generally polygonal-shaped lobe with other than four sides
2 The antenna as claimed in Claim 1 , which includes a pair of like active antenna elements arranged symmetrically about an antenna axis
3 The antenna as claimed in Claim 2, in which the sides of the lobes of the active antenna elements are substantially equal in length
4 The antenna as claimed in Claim 3, in which the lobes of the active antenna elements are generally triangular
5 The antenna as claimed in Claim 3, in which the lobes of the active antenna elements are generally hexagonal
6 The antenna as claimed in Claim 2, in which one of the active antenna elements is connected to an inner conductor of a coaxial antenna lead and the other of the active antenna elements is grounded
7 The antenna as claimed in Claim 6, which includes an inductor, the grounded active antenna element being grounded via the inductor
8 The antenna as claimed in Claim 2, which includes an elongate antenna boom, a longitudinal axis of which defines the antenna axis, the active antenna elements being mounted on the boom transversely thereto, and at least one carrier element mounted on the boom transversely thereto
9 The antenna as claimed in Claim 8, which includes at least one reflector element mounted on the boom in a plane generally perpendicular to the antenna axis
10. An antenna which includes an elongate antenna boom, a longitudinal axis of which defines an antenna axis; a plurality of carrier elements mounted on the boom transversely thereto to form an array; a plurality of reflector elements mounted on the boom in a plane generally perpendicular to the antenna axis to form an array; a pair of like active antenna elements arranged symmetrically about the antenna axis and mounted on the boom transversely thereto, one of the active antenna elements being connected to an inner conductor of a coaxial antenna lead and the other of the active antenna elements being grounded via an inductor; and in which each antenna element has a polygonal-shaped lobe with other than four sides, the sides being of substantially the same length and the value of the inductance of the inductor when expressed in millihenrys being about the same as the length of a side of the active antenna elements when expressed in millimeters.
11. An antenna substantially as herein described, with reference to Figure 1 of the accompanying diagrammatic drawings.
PCT/IB2001/000242 2000-02-26 2001-02-23 An antenna WO2001063697A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001237654A AU2001237654A1 (en) 2000-02-26 2001-02-23 An antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA99/7341 2000-02-26
ZA997341 2000-02-26

Publications (1)

Publication Number Publication Date
WO2001063697A1 true WO2001063697A1 (en) 2001-08-30

Family

ID=25588013

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/000242 WO2001063697A1 (en) 2000-02-26 2001-02-23 An antenna

Country Status (2)

Country Link
AU (1) AU2001237654A1 (en)
WO (1) WO2001063697A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1280231A1 (en) * 2001-07-26 2003-01-29 RF-Link Systems Inc., A diamond-shaped loop antenna for a wireless I/O device
EP2093836A1 (en) * 2008-02-19 2009-08-26 Televes, S.A. Yagi antenna
ES2334618A1 (en) * 2008-02-19 2010-03-12 Televes, S.A. Antenna (Machine-translation by Google Translate, not legally binding)
ES2338965A1 (en) * 2008-02-19 2010-05-13 Televes, S.A. Antenna (Machine-translation by Google Translate, not legally binding)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1516773A1 (en) * 1966-05-27 1969-12-18 Kompass Antennen Hanns Schaefe U-H-F directional antenna
US4593289A (en) * 1983-04-18 1986-06-03 Butternut Electronics Co. Multi-band dipole antenna with matching stubs
US5945962A (en) * 1996-08-19 1999-08-31 Emc Test Systems, L.P. Broad band shaped element dipole antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1516773A1 (en) * 1966-05-27 1969-12-18 Kompass Antennen Hanns Schaefe U-H-F directional antenna
US4593289A (en) * 1983-04-18 1986-06-03 Butternut Electronics Co. Multi-band dipole antenna with matching stubs
US5945962A (en) * 1996-08-19 1999-08-31 Emc Test Systems, L.P. Broad band shaped element dipole antenna

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1280231A1 (en) * 2001-07-26 2003-01-29 RF-Link Systems Inc., A diamond-shaped loop antenna for a wireless I/O device
EP2093836A1 (en) * 2008-02-19 2009-08-26 Televes, S.A. Yagi antenna
EP2093837A1 (en) 2008-02-19 2009-08-26 Televes, S.A. Yagi Antenna
ES2334618A1 (en) * 2008-02-19 2010-03-12 Televes, S.A. Antenna (Machine-translation by Google Translate, not legally binding)
ES2338965A1 (en) * 2008-02-19 2010-05-13 Televes, S.A. Antenna (Machine-translation by Google Translate, not legally binding)

Also Published As

Publication number Publication date
AU2001237654A1 (en) 2001-09-03

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