WO1988004836A1 - Antenne interieure - Google Patents

Antenne interieure Download PDF

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Publication number
WO1988004836A1
WO1988004836A1 PCT/AU1987/000429 AU8700429W WO8804836A1 WO 1988004836 A1 WO1988004836 A1 WO 1988004836A1 AU 8700429 W AU8700429 W AU 8700429W WO 8804836 A1 WO8804836 A1 WO 8804836A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
elements
structures
planar
antennas
Prior art date
Application number
PCT/AU1987/000429
Other languages
English (en)
Inventor
John Chun Sing Yip
Catherine Wei Yuen Yip
Original Assignee
John Chun Sing Yip
Catherine Wei Yuen Yip
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 John Chun Sing Yip, Catherine Wei Yuen Yip filed Critical John Chun Sing Yip
Publication of WO1988004836A1 publication Critical patent/WO1988004836A1/fr

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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/01—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the shape of the antenna or antenna system
    • 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
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H01Q5/385—Two or more parasitic elements
    • 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
    • H01Q9/06—Details
    • H01Q9/065—Microstrip dipole antennas

Definitions

  • the present invention is directed to the field of antennas and in particular antennas with planar structures for indoor use.
  • Directional antennas incorporating multiple parasitic elements such as directors or reflectors, are common in outdoor applications, for example Yagi antennas, to overcome any reception problems arising from low field strength, and to reduce ghosting which can arise from multipath reflections.
  • conventional indoor antennas usually comprise a dipole element in the form of exposed rigid rods or a loop wire supported by a stand or base. Such an antenna will usually pick up sufficient signal in urban areas where field strengths are usually high but ghosting remains a common problem.
  • Yagi antennas are also used as indoor antennas but they occupy considerably more space. Such indoor antennas are unsightly and awkwardly shaped.
  • the present invention is an antenna for indoor use comprising two or more planar structures characterized in that said planar structures support antenna elements including driven and parasitic elements and the planar structures are substantially non-parallel.
  • the word driven describes elements that are electrically feeding the antenna cable.
  • the antenna comprises at least two planar structures connected along adjacent edges to define at least one common edge, wherein one planar structure supports at least one driven element and optionally parasitic elements, and the other planar structure supports parasitic elements.
  • the use of parasitic elements and the adjustable angle between elements in connected planar structures affect beneficially the performance characteristics such as the bandwidth, gain and the front-to-back ratio of the antenna.
  • the angle can be preset during manufacture or allowed to be adjustable for fine tuning during normal usage.
  • the structures in the first embodiment are rectangular and positioned on substantially a horizontal surface either in an inverted-V shaped configuration with the common edge upper-most and free edges extended apart, or alternatively with the common edge vertical as for the case of receiving vertically polarized signals. Positioning on a wall or other vertical surface by hanging or other fixed means is also possible.
  • the planar structures are made from non-metallic material such as perspex, plastic, fibreglass board or the like.
  • the antenna elements are conductors, pteferably made from metallic wires, films or strips. Materials with suitable dielectric properties may also be used to achieve reduction of the lengths of the antenna elements which are required to resonate at the requisite design frequencies.
  • the antenna elements are supported on the planar structure, preferably by bonding onto its surface such as in the case of printed circuit boards, however, embedding the antenna elements in the structures is also possible such as in the form of slots, or as wire threaded through or encased in the structure during its formation into final form.
  • the use of parasitic elements and the adjustable angle between elements in connected planar structures affect beneficially the performance characteristics of the antenna.
  • orientation of the antenna according to the first embodiment will cause it to function as a directional antenna.
  • Additional parasitic elements placed in a plane parallel and close to that of the driven elements, for example, in the same planar structure supporting the driven element, will provide improved gain or widened bandwidth of reception.
  • Such parasitic elements can be placed in a plane in front of that of the driven elements hence acting as directors.
  • a parasitic element such as a reflector placed in the second planar structure of the antenna according to the first embodiment would also enhance the performance characteristics such as the gain and front-to-back ratio.
  • the angle extended between the two planar structures and thereby the angle and distance between antenna elements ca-n be altered to optimize the performance characteristics for the desired frequency band of operation. This arrangement also enables a broadband antenna with improved gains and front-to-back ratios over a wide bandwidth to be designed.
  • the driven elements may be two loops joined at their respective ends to provide improved gain or widened bandwidth.
  • the invention will be small, compact and stable and be directional in its reception of signal.
  • the antenna may be formed to serve a decorative or display purpose in that the planar structures can be formed as a holder for photographs, pictures or the like.
  • each structure is preferably provided with a planar outer transparent member.
  • Figures la, lb and lc are perspective front and rear views respectively of the invention according to a first embodiment.
  • Figures 2a and 2b are a perspective and inside front view of a second embodiment of the invention.
  • Figure 3 is a view according to a third embodiment.
  • Figure 4 is a view according to a fourth composite embodiment.
  • Figure 5 illustrates the angular relationships, for
  • Planar structure 1 supports the driven elements 3 which consist of a pair of stacked and joined folded dipoles made of metallic wires.
  • the two main antenna elements may not be identical, depending on the application.
  • One or more parasitic elements 5 are also in the first planar structure, lying in a plane parallel to, and in front of, that of the driven elements. The parasitic elements 5 serve to improve the bandwidth and gain by acting as a set of directors and as bandwidth-broadening elements.
  • the planar structure 2 has a parasitic element being a reflector 4 made of preferably aluminium plate or film mounted thereon.
  • a single reflector may be used for both dipoles, as shown.
  • multiple and separate reflectors can be used.
  • reflectors are not required in ghost-free reception areas but such situations are relatively rare.
  • the main antenna elements are mounted on cardboard and then inserted in between the two members la and lb of the planar structure 1 which preferably is a perspex sheet folded over.
  • the driven elements may be threaded through suitable holes made in the rear surface of planar structure 1.
  • the output signal of the driven antenna elements is fed to, for example, a television receiver.
  • a matching stub in the form of a short length of antenna cable, and a balun (matching transformer) in series can be connected to the antenna output for improving the impedance characteristics over the desired UHF band; the matching stub and balun can be physically located between the planar structures.
  • FIGS 2a and 2b a further embodiment of the invention is shown.
  • Two planar structures 6 and 7 consist of preferably cardboard covered in plastic and are connected along a common movably connected edge 7a. The structures can be positioned to extend in an inverted-V shape as shown, with bottom edges connected by a member 8.
  • the driven element 9 is a substantially triangular loop antenna contained in the structure 7.
  • Parasitic elements are directors 10 made of thin metal strips contained in structure 6.
  • This electrical arrangement is suitable for narrow-band reception.
  • the electrical arrangement described under the first embodiment can be used instead.
  • Figure 2c illustrates two movably connected structures made of plastic cardboards. A connecting member 8a is inserted into the sideholes, thus holding the structures in place. A similar member 8b is used on the other side to improve rigidity. These members can be re-positioned upwards or downwards for adjusting the angle between the structures.
  • the antenna is hung against a wall or other vertical surface which, in many situations, provides improved reception and reduces the detrimental effect on reception due to bodily movements.
  • the vertical beam-width of the antenna may be designed to be wide enough for these alternatives.
  • FIG 4 there is shown a composite embodiment of the invention. Whereas the antenna according to its preferred embodiments is primarily intended for UHF reception, a similar antenna can be designed for other frequency bands, subject to the user acceptability of the physical size.
  • the output signal of the antenna can be combined with the signal from another indoor or outdoor antenna such as a VHF television antenna by means of a signal combining unit. Accordingly, in this embodiment the UHF antenna structure is used to support also a VHF antenna mounted upon or attached to it.
  • Two rotatable telescopic metallic rods 12 forming the VHF antenna may be mounted on the upper join of the UHF antenna which is similar to that shown in figure 1 for example. It is modified in that the common edge of the planar structures is a narrow and flat member 11.
  • the design of a combined UHF and VHF antenna system as shown in figure 4 offers the advantages of a high level of flexibility in the adjustment of the positions of the two telescopic rods 12 because of their elevation, in comparison with conventional indoor combined antenna systems which typically consists of two telescopic rods mounted below or close to a UHF antenna.
  • there are often physical restrictions in the adjustment of the telescopic rods and the need to avoid undesirable electrical interaction between VHF and UHF antennas. In the arrangement as shown in figure 4, such restrictions are reduced.
  • the combining unit for the antenna system shown in figure 4 may be achieved preferably by means of a diplexer circuit using strip-line techniques on a printed circuit card which may in addition embody the main UHF antenna elements as printed circuits.
  • line 14 represents the horizontal plane of the E-vector, i.e. for H-polarized signal reception, through the electrical centre of the antenna. Sum of the angles a and b (between this horizontal plane and the antenna structures containing the elements) is less than 180 degrees.
  • the invention has the following advantages, namely, a high level of mechanical stability and compactness which blends with the necessity for an aesthetically attractive antenna in the home environment particularly when the antenna is used for a display purpose.
  • the antenna provides a directional response for ghost reduction when parasitic elements are incorporated.
  • Low cost non-rigid antenna elements such as thin metallic wires or thin aluminium films or strips may be used.
  • the invention has horizontal and vertical beamwidth angles wide enough to allow the structure or structures to be orientated in most usage situations, or inverted, as when it is hung on a wall, to achieve both reception and decorative aims.
  • both outer members can provide a display capability and this is necessary to give a high level of flexibility in antenna orientation.
  • an impedance matching circuit or device such as a balun may be used between the antenna and television receiver.
  • a circuit or device may optionally be attached to or incorporated in the antenna according to the invention.

Abstract

Une antenne intérieure comprend au moins deux structures parallèles planes (1, 2), (6, 7), lesquelles comportent ou supportent des éléments d'antenne (3), (4), (5), (9) et (12), dans lesquels sont compris des éléments à attaque directe (3), (9) et des éléments à alimentation indirecte (4), (5), l'angle entre lesdites structures étant réglable. L'utilisation d'éléments à alimentation indirecte et l'angle réglable entre les éléments influencent de façon bénéfique les caractéristiques de performance, telles que la largeur de bande, le gain et le rapport d'atténuation avant-arrière de l'antenne.
PCT/AU1987/000429 1986-12-18 1987-12-17 Antenne interieure WO1988004836A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPH956586 1986-12-18
AUPH9565 1986-12-18

Publications (1)

Publication Number Publication Date
WO1988004836A1 true WO1988004836A1 (fr) 1988-06-30

Family

ID=3771958

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1987/000429 WO1988004836A1 (fr) 1986-12-18 1987-12-17 Antenne interieure

Country Status (1)

Country Link
WO (1) WO1988004836A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003058850A2 (fr) * 2002-01-07 2003-07-17 Loranet Nv Dispositif et procede pour l'amelioration de la communication numerique sans fil de l'exterieur vers l'interieur
WO2003075404A1 (fr) * 2002-03-07 2003-09-12 Kathrein-Werke Kg Dispositif d'antennes a dipole plan
DE102013012776A1 (de) * 2013-08-01 2015-02-05 Sebastian Schramm Empfangsantenne

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2866195A (en) * 1954-02-23 1958-12-23 Neil C Powlison Television receiving antenna
US3249946A (en) * 1963-03-25 1966-05-03 Martin Marietta Corp Frequency independent antenna array with constant phase center spacing
GB2029112A (en) * 1978-06-08 1980-03-12 Murphy A Television aerial
AU2059183A (en) * 1982-02-10 1984-05-03 Sony Corporation Indoor tv antenna
EP0027067B1 (fr) * 1979-10-05 1984-07-18 Thomson-Csf Antenne plane bifilaire à rayonnement transversal et son application aux aériens radars
DE3306054A1 (de) * 1983-02-22 1984-08-23 Meier Meßtechnik, 3400 Göttingen Folien-antenne
WO1985002719A1 (fr) * 1983-12-05 1985-06-20 Motorola, Inc. Antenne d'emetteur-recepteur a bande double

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2866195A (en) * 1954-02-23 1958-12-23 Neil C Powlison Television receiving antenna
US3249946A (en) * 1963-03-25 1966-05-03 Martin Marietta Corp Frequency independent antenna array with constant phase center spacing
GB2029112A (en) * 1978-06-08 1980-03-12 Murphy A Television aerial
EP0027067B1 (fr) * 1979-10-05 1984-07-18 Thomson-Csf Antenne plane bifilaire à rayonnement transversal et son application aux aériens radars
AU2059183A (en) * 1982-02-10 1984-05-03 Sony Corporation Indoor tv antenna
DE3306054A1 (de) * 1983-02-22 1984-08-23 Meier Meßtechnik, 3400 Göttingen Folien-antenne
WO1985002719A1 (fr) * 1983-12-05 1985-06-20 Motorola, Inc. Antenne d'emetteur-recepteur a bande double

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003058850A2 (fr) * 2002-01-07 2003-07-17 Loranet Nv Dispositif et procede pour l'amelioration de la communication numerique sans fil de l'exterieur vers l'interieur
WO2003058850A3 (fr) * 2002-01-07 2004-05-06 Loranet Nv Dispositif et procede pour l'amelioration de la communication numerique sans fil de l'exterieur vers l'interieur
WO2003075404A1 (fr) * 2002-03-07 2003-09-12 Kathrein-Werke Kg Dispositif d'antennes a dipole plan
DE102013012776A1 (de) * 2013-08-01 2015-02-05 Sebastian Schramm Empfangsantenne

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