EP2654125A1 - Antenne à fente annulaire - Google Patents

Antenne à fente annulaire Download PDF

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Publication number
EP2654125A1
EP2654125A1 EP12002714.9A EP12002714A EP2654125A1 EP 2654125 A1 EP2654125 A1 EP 2654125A1 EP 12002714 A EP12002714 A EP 12002714A EP 2654125 A1 EP2654125 A1 EP 2654125A1
Authority
EP
European Patent Office
Prior art keywords
inner conductor
slot antenna
antenna
diameter
ring slot
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
EP12002714.9A
Other languages
German (de)
English (en)
Other versions
EP2654125B1 (fr
Inventor
Michael Dr. Sabielny
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.)
Hensoldt Sensors GmbH
Original Assignee
EADS Deutschland 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 EADS Deutschland GmbH filed Critical EADS Deutschland GmbH
Priority to EP12002714.9A priority Critical patent/EP2654125B1/fr
Priority to ES12002714.9T priority patent/ES2668860T3/es
Priority to US13/865,346 priority patent/US9692137B2/en
Publication of EP2654125A1 publication Critical patent/EP2654125A1/fr
Application granted granted Critical
Publication of EP2654125B1 publication Critical patent/EP2654125B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01Q13/10—Resonant slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
    • H01Q1/286—Adaptation for use in or on aircraft, missiles, satellites, or balloons substantially flush mounted with the skin of the craft
    • 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
    • H01Q13/10—Resonant slot antennas
    • H01Q13/18—Resonant slot antennas the slot being backed by, or formed in boundary wall of, a resonant cavity ; Open cavity antennas

Definitions

  • the invention relates to a ring-slot antenna according to the preamble of patent claim 1.
  • the art of ring-slot antennas is well documented in a number of trade publications which illuminate various aspects of conventional loop-slot antennas. As an example, reference is made here to [1], [2], [3].
  • a classical ring-slot antenna can therefore by the representation in Fig. 1 to be discribed.
  • the metallic antenna body 1 forms a closed cavity filled with air or a dielectric 50 and comprises as main components the rod-shaped inner conductor I between the front V and rear H and the sheath-type outer conductor A.
  • the radiating, circumferential annular slot 10 is located on the front side V of the antenna 1.
  • Reference numeral 99 designates holes for the passage of fasteners, for example, to attach the antenna to a support structure.
  • the entire arrangement is usually constructed substantially rotationally symmetrical (symmetry axis 91). However, this does not apply to the feeding of the antenna signal, which takes place laterally through a coaxial cable 20.
  • the outer conductor of the coaxial cable 20 is contacted with the outer conductor A of the antenna.
  • the inner conductor 21 of the coaxial cable 20 is guided through the outer conductor A of the antenna to the inner conductor I of the antenna.
  • the antenna is in resonance. Without further measures (such as external matching circuits), the usable bandwidth is not particularly large, since the antenna has only a single resonance mechanism (single-tuned antenna).
  • the achievable with the antenna bandwidth depends on the ratio of the volume enclosed by the antenna to the respective wavelength at resonance: the lower the volume, the lower the achievable bandwidth.
  • the known, side-fed, ring-slot antennas according to Fig. 1 must suitably guide the inner conductor of the coaxial cable and secure it against mechanical stress. Furthermore, a lateral feed is generally not axially symmetric to the resonator of the antenna, so that considerable asymmetries in the radiation pattern is expected.
  • the invention has for its object to realize an alternative design of the antenna feed without negative influences on the radiation pattern.
  • the inner conductor according to the invention is divided by a dielectric gap in a front and a rear portion, wherein the inner conductor of the coaxial feed line is contacted with the front portion of the inner conductor and the outer conductor of the coaxial feed line is contacted with the rear portion.
  • the dielectric gap provides an additional design parameter of the antenna that can be suitably used to advantage in the design of the antenna.
  • the series capacitance formed by this gap can be used as a compensation parameter for other components with reactances or susceptances.
  • the folded loop antenna according to the invention is suitable as a replacement for any form of monopole antenna, as it is electrodynamically complementary to these.
  • Monopole antennas and ring slot antennas (in the present design) have nearly identical radiation patterns (complete coverage in azimuth and one zero at elevation of 90 °), however, loop antennae can be better embedded in structures where conformal and surface-true installation must be ensured. For example, this feature gives airplanes less drag and a lower radar signature.
  • Fig. 3 shows an inventive antenna 1 (same reference numerals designate identical drawing elements, this applies throughout to all Fig. 1 to 6 ).
  • the exemplary arrangement shown is rotationally symmetric with the central axis 91 as the axis of symmetry.
  • Front U, rear H and the coat-like outer conductor A with a constant diameter form as in the known antennas together a cavity filled with air or with a dielectric is.
  • the dielectric can be selected to produce as few dielectric losses as possible.
  • the inner conductor I has a stepped structure, such that its diameter increases from the front V to the rear side H of the antenna.
  • the stepped transition of the diameter formed thereby is located inside the front portion of the inner conductor I.
  • the dielectric gap is located in the region of the inner conductor I which has an increased diameter.
  • This grading is advantageous for the impedance transformation from the impedance level of the feed line 20 (usually 50 ohms) to the level of the radiation resistance of the annular slot 10.
  • the enlargement of the inner conductor cross section can alternatively also be continuous.
  • the goal of optimal impedance matching can also be achieved with a change in the diameter of the outer conductor A. become ( Fig. 5 ).
  • the enlargement of the outer conductor cross-section can, as in Fig. 5 Shown in the form of a step, so that two areas of the outer conductor are formed with a higher or smaller diameter.
  • the area of the outer conductor with increased diameter is located near the front side V of the antenna, while the area of the outer conductor with a comparatively small diameter is located near the rear side H.
  • the dielectric gap is in the volume enclosed by the outer diameter region of smaller diameter.
  • an increase in diameter can also be continuous.
  • the dielectric gap as well as the described shape of the inner conductor I and / or outer conductor A form additional parameters of the antenna, which can be suitably used advantageously in the design of the antenna.
  • this makes it easier and more flexible to achieve impedance transformation from the reference impedance of the input line (e.g., 50 ohms) to the radiation resistance of the ring slot even in situations where the entire antenna becomes electrically small (e.g., less than one-eighth of the respective wavelength).
  • an optional matching network 30 may be used, as in FIG Fig. 4 shown.
  • This matching network 30 is characterized by the in Fig. 4 shown design of the antenna body 1 integrated with the enclosed volume of the antenna.
  • the rear side H of the antenna has a recess 31, in which the matching circuit 30 is arranged sunk.
  • the matching circuit is central to the axis of rotation placed so that the symmetry of the overall arrangement is not disturbed. Also, this design achieves mechanical protection of the matching network.
  • the antenna according to the invention can be covered in an advantageous embodiment with a radome.
  • a radome This serves in particular for the mechanical protection of the antenna or for adapting the antenna structure to the surface of a mounting platform, for example of a vehicle, in particular an aircraft.
  • Fig. 6 shows a corresponding embodiment of the antenna, in which the front side V of the antenna is covered with a radome 60. It is a dielectric layer that is designed as neutral as possible with respect to the radiation of the antenna. In a specific embodiment, it may be a frequency selective radome.
  • the front side V of the antenna does not necessarily have to be planar. In particular, for adaptation and conformity with the surrounding surface structure of a mounting platform, it can also be curved, in particular designed to be uniaxial or biaxially curved.
  • Fig. 7 shows such an embodiment. It can be seen that the surface of the front side V of the antenna is curved. The curvature can be chosen so that the symmetry of the overall arrangement is not disturbed. Depending on the specification by the surface structure of the mounting platform, it is also possible to deviate in terms of the shape of the front of the antenna from a rotationally symmetrical structure. This is the case, for example, with a uniaxially curved design of the front of the antenna.
EP12002714.9A 2012-04-19 2012-04-19 Antenne à fente annulaire Active EP2654125B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12002714.9A EP2654125B1 (fr) 2012-04-19 2012-04-19 Antenne à fente annulaire
ES12002714.9T ES2668860T3 (es) 2012-04-19 2012-04-19 Antena de ranura anular
US13/865,346 US9692137B2 (en) 2012-04-19 2013-04-18 Annular slot antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12002714.9A EP2654125B1 (fr) 2012-04-19 2012-04-19 Antenne à fente annulaire

Publications (2)

Publication Number Publication Date
EP2654125A1 true EP2654125A1 (fr) 2013-10-23
EP2654125B1 EP2654125B1 (fr) 2018-03-14

Family

ID=46085317

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12002714.9A Active EP2654125B1 (fr) 2012-04-19 2012-04-19 Antenne à fente annulaire

Country Status (3)

Country Link
US (1) US9692137B2 (fr)
EP (1) EP2654125B1 (fr)
ES (1) ES2668860T3 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10158178B2 (en) 2013-11-06 2018-12-18 Symbol Technologies, Llc Low profile, antenna array for an RFID reader and method of making same
US9847571B2 (en) 2013-11-06 2017-12-19 Symbol Technologies, Llc Compact, multi-port, MIMO antenna with high port isolation and low pattern correlation and method of making same
US9509060B2 (en) 2014-08-19 2016-11-29 Symbol Technologies, Llc Open waveguide beamforming antenna for radio frequency identification reader
US10756814B2 (en) * 2015-08-31 2020-08-25 The Boeing Company Conformal load bearing distributed sensing arrays
GB2552921A (en) * 2016-04-04 2018-02-21 Creo Medical Ltd Electrosurgical probe for delivering RF and microwave energy
CN107785659A (zh) * 2017-10-16 2018-03-09 广东曼克维通信科技有限公司 飞行器及其机载超宽带全向天线
RU2680110C1 (ru) * 2018-05-25 2019-02-15 Российская Федерация, от имени которой выступает Государственная корпорация по космической деятельности "РОСКОСМОС" Антенна эллиптической поляризации
US10923810B2 (en) * 2018-06-29 2021-02-16 Deere & Company Supplemental device for an antenna system
RU2720048C1 (ru) * 2019-05-17 2020-04-23 Акционерное общество "Особое конструкторское бюро Московского энергетического института" Кольцевая резонансная малогабаритная антенна круговой поляризации
RU2715811C1 (ru) * 2019-08-28 2020-03-03 Дмитрий Алексеевич Антропов Кольцевая щелевая антенна
RU2761412C1 (ru) * 2020-12-21 2021-12-08 Акционерное общество "Особое конструкторское бюро Московского энергетического института" Моноимпульсная кольцевая резонансная антенна

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1113796A (fr) * 1954-09-13 1956-04-04 Applic Rech Electronique Antenne radioélectrique
EP0439677A2 (fr) * 1990-02-01 1991-08-07 Robert Bosch Gmbh Antenne de véhicule comportant une paroi conductrice avec une fente annulaire
US20040150575A1 (en) * 2003-02-03 2004-08-05 Silver Spring Networks, Inc. Flush-mounted antenna and transmission system

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US2644090A (en) * 1948-03-05 1953-06-30 Dorne Arthur Recessed slot antenna
US2746040A (en) * 1950-05-20 1956-05-15 Rca Corp Annular element antenna systems
US2834959A (en) * 1956-05-01 1958-05-13 Dorne And Margolin Inc Antennas
US3718869A (en) * 1971-03-29 1973-02-27 Us Army Microwave oscillator with coaxial leakage output coupling
GB2005922B (en) * 1977-10-01 1982-05-19 Secr Defence Radio antennae
US4443802A (en) * 1981-04-22 1984-04-17 University Of Illinois Foundation Stripline fed hybrid slot antenna
US4682180A (en) * 1985-09-23 1987-07-21 American Telephone And Telegraph Company At&T Bell Laboratories Multidirectional feed and flush-mounted surface wave antenna
US4821040A (en) * 1986-12-23 1989-04-11 Ball Corporation Circular microstrip vehicular rf antenna
US4994817A (en) * 1989-07-24 1991-02-19 Ball Corporation Annular slot antenna
US5194876A (en) * 1989-07-24 1993-03-16 Ball Corporation Dual polarization slotted antenna
US5202697A (en) * 1991-01-18 1993-04-13 Cubic Defense Systems, Inc. Low-profile steerable cardioid antenna
US6288685B1 (en) * 1998-09-09 2001-09-11 Schlumberger Resource Management Services, Inc. Serrated slot antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1113796A (fr) * 1954-09-13 1956-04-04 Applic Rech Electronique Antenne radioélectrique
EP0439677A2 (fr) * 1990-02-01 1991-08-07 Robert Bosch Gmbh Antenne de véhicule comportant une paroi conductrice avec une fente annulaire
US20040150575A1 (en) * 2003-02-03 2004-08-05 Silver Spring Networks, Inc. Flush-mounted antenna and transmission system

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
S. A. CLAVIJO; R. E. DIAZ; E. CASWELL: "Low-profile mounting-tolerant folded-out annular slot antenna for VHF applications", ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, 2007 IEEE, 2007, pages 13 - 16, XP031169062
T. J. YUAN U. A.: "A compact broadband omnidirectional vertically polarized VHF antenna for aircraft", MICROWAVE CONFERENCE (EUMC), 2010 EUROPEAN, 2010, pages 1480 - 1483, XP031785804
VOLAKIS J L ET AL: "A SCHEME TO LOWER THE RESONANT FREQUENCY OF THE MICROSTRIP PATCH ANTENNA", IEEE MICROWAVE AND GUIDED WAVE LETTERS, IEEE INC, NEW YORK, US, vol. 2, no. 7, 1 July 1992 (1992-07-01), pages 292 - 293, XP000279147, ISSN: 1051-8207, DOI: 10.1109/75.143399 *
W. CUMMING; M. CORMIER: "Design data for small annular slot antennas", ANTENNAS AND PROPAGATION, IRE TRANSACTIONS ON, vol. 6, no. 2, 1958, pages 210 - 211

Also Published As

Publication number Publication date
EP2654125B1 (fr) 2018-03-14
ES2668860T3 (es) 2018-05-22
US20130278475A1 (en) 2013-10-24
US9692137B2 (en) 2017-06-27

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