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GB2033161B - Reflector antennae - Google Patents

Reflector antennae

Info

Publication number
GB2033161B
GB2033161B GB7925563A GB7925563A GB2033161B GB 2033161 B GB2033161 B GB 2033161B GB 7925563 A GB7925563 A GB 7925563A GB 7925563 A GB7925563 A GB 7925563A GB 2033161 B GB2033161 B GB 2033161B
Authority
GB
United Kingdom
Prior art keywords
reflector
frequency
centre
phase
feed system
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.)
Expired
Application number
GB7925563A
Other versions
GB2033161A (en
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.)
SECR DEFENCE
UK Secretary of State for Defence
Original Assignee
SECR DEFENCE
UK Secretary of State for Defence
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 SECR DEFENCE, UK Secretary of State for Defence filed Critical SECR DEFENCE
Priority to GB7925563A priority Critical patent/GB2033161B/en
Priority to US06/083,917 priority patent/US4342035A/en
Publication of GB2033161A publication Critical patent/GB2033161A/en
Application granted granted Critical
Publication of GB2033161B publication Critical patent/GB2033161B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
    • H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/10—Logperiodic antennas
    • 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
    • H01Q19/15—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 being a line source, e.g. leaky waveguide antennas

Landscapes

  • Aerials With Secondary Devices (AREA)

Abstract

A reflector antenna comprising a reflector system, and a feed system, eg a log-periodic feed system (1) the phase-centre of which moves with frequency, for illuminating the reflector system to produce a substantially focussed antenna beam. To compensate for frequency variations in the position of the phase-centre of the feed system, the reflector system includes a frequency dependent reflector (2) the effective surface of reflection of which (6a-6e) varies with frequency to cause the focus of the reflector system to move with the phase-centre of the feed system. A number of different forms of suitable frequency dependent reflectors are described, employing composite arrangements of frequency selective mesh or grid reflector elements, or arrays of reflecting horns or wedges. <IMAGE>
GB7925563A 1978-04-25 1979-07-23 Reflector antennae Expired GB2033161B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB7925563A GB2033161B (en) 1978-04-25 1979-07-23 Reflector antennae
US06/083,917 US4342035A (en) 1979-07-23 1979-10-11 Frequency compensating reflector antenna

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1626478 1978-04-25
GB7925563A GB2033161B (en) 1978-04-25 1979-07-23 Reflector antennae

Publications (2)

Publication Number Publication Date
GB2033161A GB2033161A (en) 1980-05-14
GB2033161B true GB2033161B (en) 1982-08-25

Family

ID=26251933

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7925563A Expired GB2033161B (en) 1978-04-25 1979-07-23 Reflector antennae

Country Status (1)

Country Link
GB (1) GB2033161B (en)

Also Published As

Publication number Publication date
GB2033161A (en) 1980-05-14

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Legal Events

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