FR2281659A1 - ELECTRO-MAGNETIC WAVE FILTERING GRID - Google Patents

ELECTRO-MAGNETIC WAVE FILTERING GRID

Info

Publication number
FR2281659A1
FR2281659A1 FR7427765A FR7427765A FR2281659A1 FR 2281659 A1 FR2281659 A1 FR 2281659A1 FR 7427765 A FR7427765 A FR 7427765A FR 7427765 A FR7427765 A FR 7427765A FR 2281659 A1 FR2281659 A1 FR 2281659A1
Authority
FR
France
Prior art keywords
frequency
alignments
waves
substrate
cut
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
FR7427765A
Other languages
French (fr)
Other versions
FR2281659B1 (en
Inventor
Nhu Bui-Hai
Alain Bourgeois
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Priority to FR7427765A priority Critical patent/FR2281659A1/en
Priority to IT5086175A priority patent/IT1041168B/en
Priority to GB3324675A priority patent/GB1490594A/en
Publication of FR2281659A1 publication Critical patent/FR2281659A1/en
Application granted granted Critical
Publication of FR2281659B1 publication Critical patent/FR2281659B1/fr
Granted 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

Landscapes

  • Aerials With Secondary Devices (AREA)

Abstract

1490594 E-M wave filtering device THOMSON-CSF 8 Aug 1975 [9 Aug 1974] 33246/75 Heading H4A A low-pass filter which passes e-m waves of frequency below a cut-off value while reflecting higher frequency waves comprises a dielectric sheet substrate 1 supporting parallel alignments 2-6 of metal elements on one of its faces and alignments 7-13 on its other face. The element length is just less than half the wavelength at the desired cut-off frequency. The orthogonal arrangement of the alignments as shown provides a double polarization of the waves. If the central part of each element is made wider or narrower than the remainder, the slope of the filter attenuation-versus-frequency characteristic is reduced or the cut-off frequency is reduced, respectively. Substrate 1 may be flat or curved. The filter may be used as a curved reflector for the high-frequency band of a dual-band antenna, while passing the low-frequency band without significant attenuation. Substrate 1 is a printed circuit board, a sheet of foamed dielectric, or a three-layer structure (having a cellular core).
FR7427765A 1974-08-09 1974-08-09 ELECTRO-MAGNETIC WAVE FILTERING GRID Granted FR2281659A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR7427765A FR2281659A1 (en) 1974-08-09 1974-08-09 ELECTRO-MAGNETIC WAVE FILTERING GRID
IT5086175A IT1041168B (en) 1974-08-09 1975-08-07 ELECTROMAGNETIC WAVES FILTERING GRID
GB3324675A GB1490594A (en) 1974-08-09 1975-08-08 Electromagnetic wave filtering grid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7427765A FR2281659A1 (en) 1974-08-09 1974-08-09 ELECTRO-MAGNETIC WAVE FILTERING GRID

Publications (2)

Publication Number Publication Date
FR2281659A1 true FR2281659A1 (en) 1976-03-05
FR2281659B1 FR2281659B1 (en) 1979-09-28

Family

ID=9142311

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7427765A Granted FR2281659A1 (en) 1974-08-09 1974-08-09 ELECTRO-MAGNETIC WAVE FILTERING GRID

Country Status (3)

Country Link
FR (1) FR2281659A1 (en)
GB (1) GB1490594A (en)
IT (1) IT1041168B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514203A1 (en) * 1981-10-05 1983-04-08 Radant Etudes HYPERFREQUENCY SPATIAL ADAPTIVE FILTER FOR ANOTHER POLARIZATION ANTENNA AND METHOD FOR THE IMPLEMENTATION THEREOF
FR2569906A1 (en) * 1984-08-30 1986-03-07 Messerschmitt Boelkow Blohm MICROWAVE ANTENNA REFLECTOR WITH SELECTIVE POLARIZATION GRID STRUCTURE
US5652631A (en) * 1995-05-08 1997-07-29 Hughes Missile Systems Company Dual frequency radome

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4476471A (en) * 1981-02-09 1984-10-09 Nippon Electric Co., Ltd. Antenna apparatus including frequency separator having wide band transmission or reflection characteristics
DE3436063A1 (en) * 1984-10-02 1986-04-10 Autoflug Gmbh, 2084 Rellingen STACKED ARRANGEMENT TO IMPROVE RADAR REFLECTION
DE3726309A1 (en) * 1987-08-07 1989-02-16 Messerschmitt Boelkow Blohm Radar camouflage of aircraft antennas
DE3824292A1 (en) * 1988-07-16 1990-01-18 Battelle Institut E V Method for fabricating thin-film absorbers for electromagnetic waves
FR2697948B1 (en) * 1992-11-10 1994-12-02 Commissariat Energie Atomique Device forming an artificial capacitive surface admittance, application to the production of two-dimensional cavities, resonators and antennas.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514203A1 (en) * 1981-10-05 1983-04-08 Radant Etudes HYPERFREQUENCY SPATIAL ADAPTIVE FILTER FOR ANOTHER POLARIZATION ANTENNA AND METHOD FOR THE IMPLEMENTATION THEREOF
EP0076760A1 (en) * 1981-10-05 1983-04-13 Thomson-Csf Radant Adaptive spatial microwave filter for an antenna with any polarisation, and method for putting it into use
US4518966A (en) * 1981-10-05 1985-05-21 Societe D'etude Du Radant Adaptive spatial microwave filter for multipolarized antennas and the process of its application
FR2569906A1 (en) * 1984-08-30 1986-03-07 Messerschmitt Boelkow Blohm MICROWAVE ANTENNA REFLECTOR WITH SELECTIVE POLARIZATION GRID STRUCTURE
US5652631A (en) * 1995-05-08 1997-07-29 Hughes Missile Systems Company Dual frequency radome

Also Published As

Publication number Publication date
FR2281659B1 (en) 1979-09-28
IT1041168B (en) 1980-01-10
GB1490594A (en) 1977-11-02

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Legal Events

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