GB2222486A - Reflector aerial radiating system - Google Patents

Reflector aerial radiating system Download PDF

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Publication number
GB2222486A
GB2222486A GB8918685A GB8918685A GB2222486A GB 2222486 A GB2222486 A GB 2222486A GB 8918685 A GB8918685 A GB 8918685A GB 8918685 A GB8918685 A GB 8918685A GB 2222486 A GB2222486 A GB 2222486A
Authority
GB
United Kingdom
Prior art keywords
radiator according
double radiator
horn radiators
double
radiators
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.)
Granted
Application number
GB8918685A
Other versions
GB8918685D0 (en
GB2222486B (en
Inventor
Karl-Peter Dombeck
Volker Hombach
Hans Scheffer
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.)
Kabelmetal Electro GmbH
Original Assignee
Kabelmetal Electro GmbH
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 Kabelmetal Electro GmbH filed Critical Kabelmetal Electro GmbH
Publication of GB8918685D0 publication Critical patent/GB8918685D0/en
Publication of GB2222486A publication Critical patent/GB2222486A/en
Application granted granted Critical
Publication of GB2222486B publication Critical patent/GB2222486B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H01Q13/02—Waveguide horns
    • H01Q13/0208—Corrugated horns
    • 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
    • H01Q19/10—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 reflecting surfaces
    • H01Q19/12—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 reflecting surfaces wherein the surfaces are concave
    • H01Q19/17—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 reflecting surfaces wherein the surfaces are concave the primary radiating source comprising two or more radiating elements

Landscapes

  • Aerials With Secondary Devices (AREA)
  • Waveguide Aerials (AREA)

Description

() C)
DESCRIPTION
REFLECTOR AERIAL RADIATING SYSTEM The invention relates to radiators of reflector aerials which can be used especially in digital directional radio to compensate for interference due to multipath propagation. it is shown in K.-P. Dombek's "Reduction of multipath interference by adaptive beam orientation",, European Conference on Radio-Relay-Systems, Conf. Publ. ECRR, VDE-Verlag, 1986, p. 400-406. that it is possible to effectively reduce interference due to multipath propagation, as occurs in radio links during unfavourable weather conditions, by small angular swings of the main lobe of the transmitting andlor receiving aerial. A directional radio aerial suitable for this must generate at least two closely adjacent radiation lobes which can be switched over. Where these radiation lobes have too great an angular distance. impermissibly high losses in gain must be tolerated.
Fig. 1 shows a known parabolic aerial with main reflector 1 and two funnel-shaped radiators 2a and 2b. The radiator distance 3 between the points of concentration of the radiation of the radiators 2a, 2b determines the angular distance 5 between the deflected lobes in the radiation field of the aerial. With known arrangements of the horn radiators 2a, 2b, the aperture diameter 4 of an individual radiator is always smaller than the radiator distance 3.
If an aerial with two radiation lobes is required whose intersection level 6 is -6dB or more. the radiator distance and hence the diameter of the radiator aperture must be selected to be so small that the reflector 1 is automatically illuminated with a relatively high boundary level which is > -5d.B. The high boundary level causes undesired spill-over of the radiators beyond the reflector edge, additional losses and an increased side-lobe level 7 in the radiation pattern. The physically determined, unfavourable ratios between lobe distance 5 and 1 2 - is radiator diameter 4 are generally valid, regardless of the relationships of the focal length 9 and of the diameter 8 of a reflector. They apply in particular also to two-reflector systems.
one possibility of arranging radiators more densely than would correspond to their geometric dimensions is mentioned in the literature cited above. Dielectric radiators are used here, whose aperture area which electrically effectively determines the radiation is greater than the geometric cross-sectional area. However, dielectric radiators can only be produced without cross-couplings for reflectors with a small focal length/diameter ratio. They have pronounced side lobes and usually also a high cross-polarization.
The object of the invention,to design a double radiator which permits the generation of two deflected radiation lobes with an intersection level of > -6dB,is achieved by the invention characterized in the main claim. Further refinements of the invention are characterized in the sub-claims. The double radiator concentrates so greatly that it can be used in reflectors with a large focal length/diameter ratio, that is in tworeflector systems in particular. By virtue of the design according to the invention, the deflected radiation lobes of the reflector aerial have a low side-lobe level and cross-polarization level.
An exemplary embodiment of the invention is described in greater detail below and illustrated in the drawing. in which:
Fig. 1 shows a known parabolic aerial with two horn radiators; Fig. 2 shows a double radiator according to the invention; and Fig. 3 shows a radiation pattern.
Fig. 2 shows a front view and a cross-sectional view of 1 is a double radiator according to the invention. Distance, depth and arrangement of the axial grooves are dimensioned so that the individual patterns are to a large extent free of cross-polarization and side lobes, and in such a way as to permit broadband illumination of a reflector with the focal length/diameter ratio 0.7 at a boundary level of approximately - 18dB. The mutually penetrating grooves in the contact zone 12 of the horn radiators 10, 11 ensure a sufficient decoupling of the patterns. Fig. 3 shows the radiation patterns of the reflector aerial with double radiator in the plane of deflection of the two lobes as a solid and as a dashed curve. The intersection level of the two lobes is -6dB. A reflector aerial of this kind is particularly suitable for use in digital radio links which require measures for reducing the interference due to multipath propagation.
The individual patterns of the double radiator according to the invention are slightly inclined towards the common plane of symmetry. The illumination of a reflector is thereby improved. To minimize the spillover, it is advantageous to additionally incline the axes of the individual radiators.
An enhancement of the decoupling of the individual radiators and their matching is achieved by insertion of conductive plates and pins or dielectric inserts in the penetration zone.
It will of course be understood that the present invention has been described above purely by way of example, and modifications of detail can be made within the scope of the invention as defined in the appended claims.
1

Claims (11)

  1. Double radiator for reflector aerials for generating two closely adjacent radiation lobes, characterized in that two axially symmetrical horn radiators at least partially penetrate each other.
  2. Double radiator according to Claim 1, characterized in that in the penetration zone the horn radiators have a common web.
  3. 3. Double radiator according to Claim 1, characterized in that in the penetration zone the horn radiators have a common groove.
  4. Double radiator according to Claims 1 to 3, characterized in that the axes of the two horn radiators are mutually inclined.
  5. 5. Double radiator according to Claims 1 to 4, charac terized in that conductive plates and pinsare attached in the penetration zone of the horn radiators.
  6. 6. Double radiator according to Claims 1 to 5, characterized in that dielectric inserts are attached in the penetration zone.
  7. 7. Double radiator according to Claims 1 to 6, charac terized in that the horn radiators are constructed from smooth-walled dielectrically coated rotationally symmetrical structures.
  8. 8. Double radiator according to Claims 1 to 6, charac terized in that the horn radiators are constructed from grooved rotationally symmetrical structures.
  9. 9. Double radiator according to Claims 1 to 6, charac terized in that the horn radiators are constructed from smooth-walled dielectrically coated rectangular structures.
  10. 10. Double radiator according to Claims 1 to 6, charac terized in that the horn radiators are constructed from grooved rectangular structures.
  11. 11. Double radiator according to claim 1, substantially as described with reference to Figure 2 of the accompanying drawings.
    Publiahed19WatThe Patent Offtce, State House, M 7tVlghHelburn. London WC1R47P Further copies maYbeObtLMecitr'OMThs"zlto'MC
GB8918685A 1988-08-30 1989-08-16 Reflector aerial radiating system Expired - Fee Related GB2222486B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3829370A DE3829370A1 (en) 1988-08-30 1988-08-30 DOUBLE EXCITER FOR MIRROR ANTENNAS FOR GENERATING TWO NEARBY NEIGHBORED LOBS

Publications (3)

Publication Number Publication Date
GB8918685D0 GB8918685D0 (en) 1989-09-27
GB2222486A true GB2222486A (en) 1990-03-07
GB2222486B GB2222486B (en) 1993-02-17

Family

ID=6361874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8918685A Expired - Fee Related GB2222486B (en) 1988-08-30 1989-08-16 Reflector aerial radiating system

Country Status (3)

Country Link
DE (1) DE3829370A1 (en)
GB (1) GB2222486B (en)
IT (1) IT1232185B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994028467A1 (en) * 1993-05-24 1994-12-08 Medison Co., Ltd. Bandwidth sampling technique for digital focusing in array imaging systems
US6388633B1 (en) 1996-11-15 2002-05-14 Yagi Antenna Co., Ltd. Multibeam antenna

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4001952A1 (en) * 1990-01-24 1991-08-08 Siemens Ag Double exciter for reflector antenna - has dielectric region with low dielectric constant
DE4009322A1 (en) * 1990-03-23 1991-09-26 Ant Nachrichtentech Supply system for angle diversity operation of dish reflector antenna - has pair of horns between dish and sub-reflector defining angle between them
WO1999038228A1 (en) * 1998-01-22 1999-07-29 Matsushita Electric Industrial Co., Ltd. Multi-primary radiator, down converter and multibeam antenna
DE102009034429B4 (en) * 2009-07-23 2013-06-27 Kathrein-Werke Kg Flachantenne

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1054057A (en) *
GB495977A (en) * 1936-07-21 1938-11-23 Standard Telephones Cables Ltd Ultra short wave transmission systems
GB640181A (en) * 1946-09-24 1950-07-12 Marconi Wireless Telegraph Co Improvements in or relating to ultra high frequency wave transmission systems
GB1002140A (en) * 1961-03-01 1965-08-25 Thomson Houston Comp Francaise Ultra short-wave antennas
GB1179768A (en) * 1966-03-09 1970-01-28 Telefunken Patent Improvements in or relating to Aerial Arrangements of the Radiating Aperture Type

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1054057A (en) *
GB495977A (en) * 1936-07-21 1938-11-23 Standard Telephones Cables Ltd Ultra short wave transmission systems
GB640181A (en) * 1946-09-24 1950-07-12 Marconi Wireless Telegraph Co Improvements in or relating to ultra high frequency wave transmission systems
GB1002140A (en) * 1961-03-01 1965-08-25 Thomson Houston Comp Francaise Ultra short-wave antennas
GB1179768A (en) * 1966-03-09 1970-01-28 Telefunken Patent Improvements in or relating to Aerial Arrangements of the Radiating Aperture Type

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994028467A1 (en) * 1993-05-24 1994-12-08 Medison Co., Ltd. Bandwidth sampling technique for digital focusing in array imaging systems
US5581036A (en) * 1993-05-24 1996-12-03 Medison Co., Ltd. Bandwidth sampling technique for digital focusing in array imaging systems
US6388633B1 (en) 1996-11-15 2002-05-14 Yagi Antenna Co., Ltd. Multibeam antenna
US6864850B2 (en) 1996-11-15 2005-03-08 Yagi Antenna Co., Ltd. Multibeam antenna

Also Published As

Publication number Publication date
IT1232185B (en) 1992-01-25
GB8918685D0 (en) 1989-09-27
GB2222486B (en) 1993-02-17
DE3829370A1 (en) 1990-03-01
IT8948308A0 (en) 1989-08-28

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950816