GB2215136A - Broadsword anti-radar foil - Google Patents

Broadsword anti-radar foil Download PDF

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Publication number
GB2215136A
GB2215136A GB8802963A GB8802963A GB2215136A GB 2215136 A GB2215136 A GB 2215136A GB 8802963 A GB8802963 A GB 8802963A GB 8802963 A GB8802963 A GB 8802963A GB 2215136 A GB2215136 A GB 2215136A
Authority
GB
United Kingdom
Prior art keywords
foil
radar
shaped foil
amp
fins
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.)
Withdrawn
Application number
GB8802963A
Other versions
GB8802963D0 (en
Inventor
Ronald Cecil Hutchins
Original Assignee
Ronald Cecil Hutchins
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 Ronald Cecil Hutchins filed Critical Ronald Cecil Hutchins
Priority to GB8802963A priority Critical patent/GB2215136A/en
Publication of GB8802963D0 publication Critical patent/GB8802963D0/en
Publication of GB2215136A publication Critical patent/GB2215136A/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14Reflecting surfaces; Equivalent structures
    • H01Q15/145Reflecting surfaces; Equivalent structures comprising a plurality of reflecting particles, e.g. radar chaff

Abstract

The limited advantage of chaff when the radar detection system to be confused has moving target indication (MTI) to screen out such 'slow moving' targets, is countered by the use of offset 45 degree angle fins at the base of the chaff foil pieces so as to present a doppler complication to the reflected radar wave. The rotational velocity of the foil could show up just as readily as a linear velocity of a target such as an aircraft. With many of this type of foil aloft, and each having somewhat different rotational velocities, the doppler system can conceivably be confused. At the same time, the rotation of these units help to increase the target area making a cluster of such units seem larger than actual in terms of the radar signature. The design geometry of the blade coupled with the angular displacement of the fins, serve to govern the rotational velocity of the unit in flight, thus presenting each reflecting surface for a slightly longer exposure than if the blade were pointed and the edges streamlined. Prototypes have proved the aerodynamic stability of the units, and the added advantage of compacted stowage in a limited space is readily observed. <IMAGE>

Description

BROAPSWORD ANTI-RADAR FOIL.

This invention relates to a new configuration in the field of passive Radar countermeasures. The title 'Broadsword' is in reference to its shape, and has no trade or personal connotations, serving only to differentiate it from other types of foil presently in use.

The use of aluminium foil to confuse ground to air Radar has been employed for a considerable number of years, with, in many cases, inadequate or uncertain results, and giving insufficient protection to the aircraft or target under fire. This is due mainly to its erratic movement in eddying air currents after release in the upper atmosphere which can leave large holes in the field of foils, through which the Radar beam can penetrate.

The essential technical features of this invention are as follows. The concept of the foil, as I will now describe, is a design of a military Radar countermeasure device, made from metalized mylar or aluminium foil having the approximate shape of a 'broadsword'- like projectile just under ten centimetres in length. Two fins located at the lower end of the foil are offset in relation to each other by an angle of 45 degrees. When dropped into the upper atmosphere by an aircraft, or the exploding nose- cone of a missile,in large quantities, each individual unit would disperse and begin rotating about its central axis. The light weight of individual units, combined with the rotating action, would allow the device to remain aloft for relatively long periods whilst exhibiting alternate reflecting surfaces to the transmitted Radar beam.Updrafts or thermal inversion conditions are also made use of by virtue of the cushion of air beneath the spinning fins.

The foil maintains its vertical stance during the whole time it is in flight.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which : Figure I. Illustrates two dimensionally, the outline or shape of the foil.

Figure 2. The side view, showing the offset position of the fins.

Figure 3. View from above, showing the position of the 'blade' part of the foil in relation to the fins.

Referring to the drawing, it will be clearly observed that there is little or no complexity in its construction, the foil being fabricated from a single piece of very lightweight metalized mylar or aluminium sheet. There are no moving parts, with the possible exception of the fins which are preset at some stage during manufacture. There are only two functional parts to the finished unit. One being the 'blade', which is uppermost, and which supplies the alternate reflecting surfaces during rotation, and two being the fins causing the rotary motion imparted to the blade.

Vhen the foil is released at a high altitude, it immediately takes on a vertical attitude due to its elongated shape, and begins its fall earthwards.

The air passing between the two fins exerts an aerodynamic effect on the fin surfaces causing them to act like a propeller. Once rotation has been induced,the foil will maintain its vertical stance continuously due to the air pressure on both sides of the blade being equal at all times. It will then continue to rotate during its descent at the same r.p.m throughout.

For identification purposes, the blade which begins at the squared-off tip and terminates at the neck adjoining the shoulders and fin assembly, is nominated 'A'. The shoulders 'B', and the fins,'C' and 'D' respectively.

Claims (9)

  1. I. A passive military radar countermeasure foil, ( hereinafter known as 'a shaped foil' ) which uses aerodynamic principles in its application.
  2. 2. A shaped foil which remains in a perpendicular attitude during its descent as claimed in claim I.
  3. 3. A shaped foil which continuously rotates during its descent, as claimed in claims I & 2.
  4. 4. A shaped foil which presents a continuous series of alternating surfaces to a radar transmission during its descent, as claimed in claim 3.
  5. 5. A shaped foil which has offset fins at the base to induce and maintain rotation during descent, as claimed in claims I & 3.
  6. 6. A shaped foil in which the use of the offset 45deg: fins present a varying doppler waveform to the resonant cavity of the missile receiver when many foils are in flight, as claimed in claims 3 & 4.
  7. 7. A shaped foil which causes a cluster of such foils to appear larger to the missile radar, due to the alternate surfaces presented to it, as claimed in claims 3-4-5 & 6.
  8. 8. A shaped foil which , when manufactured to certain dimensions, will resonate to frequencies relevant to missile radar transmissions, and , en-masse provide a conglomerate reflective field in addition to preceding claims.
  9. 9. A passive military radar countermeasure foil substantially as described herein with reference to I - 2 & 9 of the accompanying drawing.
GB8802963A 1988-02-10 1988-02-10 Broadsword anti-radar foil Withdrawn GB2215136A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8802963A GB2215136A (en) 1988-02-10 1988-02-10 Broadsword anti-radar foil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8802963A GB2215136A (en) 1988-02-10 1988-02-10 Broadsword anti-radar foil

Publications (2)

Publication Number Publication Date
GB8802963D0 GB8802963D0 (en) 1988-06-02
GB2215136A true GB2215136A (en) 1989-09-13

Family

ID=10631388

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8802963A Withdrawn GB2215136A (en) 1988-02-10 1988-02-10 Broadsword anti-radar foil

Country Status (1)

Country Link
GB (1) GB2215136A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2190749A1 (en) * 2001-11-30 2003-08-01 Fractus Sa Dispersers "chaff" multilevel and / or "space-filling" against radar
US6809692B2 (en) 2000-04-19 2004-10-26 Advanced Automotive Antennas, S.L. Advanced multilevel antenna for motor vehicles
US7920097B2 (en) 2001-10-16 2011-04-05 Fractus, S.A. Multiband antenna
US7932870B2 (en) 1999-10-26 2011-04-26 Fractus, S.A. Interlaced multiband antenna arrays
US8009111B2 (en) 1999-09-20 2011-08-30 Fractus, S.A. Multilevel antennae
US8207893B2 (en) 2000-01-19 2012-06-26 Fractus, S.A. Space-filling miniature antennas
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9755314B2 (en) 2001-10-16 2017-09-05 Fractus S.A. Loaded antenna

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Applied ECM" by van Brunt, E.W. Engineering Inc *
"Strategy of electromagnetic Conflict" Editor Lt *
IEE Proceedings, Part F, June 1982 Volume 129 No *

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8330659B2 (en) 1999-09-20 2012-12-11 Fractus, S.A. Multilevel antennae
US9240632B2 (en) 1999-09-20 2016-01-19 Fractus, S.A. Multilevel antennae
US10056682B2 (en) 1999-09-20 2018-08-21 Fractus, S.A. Multilevel antennae
US9761934B2 (en) 1999-09-20 2017-09-12 Fractus, S.A. Multilevel antennae
US8941541B2 (en) 1999-09-20 2015-01-27 Fractus, S.A. Multilevel antennae
US8009111B2 (en) 1999-09-20 2011-08-30 Fractus, S.A. Multilevel antennae
US8154463B2 (en) 1999-09-20 2012-04-10 Fractus, S.A. Multilevel antennae
US8154462B2 (en) 1999-09-20 2012-04-10 Fractus, S.A. Multilevel antennae
US9000985B2 (en) 1999-09-20 2015-04-07 Fractus, S.A. Multilevel antennae
US8976069B2 (en) 1999-09-20 2015-03-10 Fractus, S.A. Multilevel antennae
US9054421B2 (en) 1999-09-20 2015-06-09 Fractus, S.A. Multilevel antennae
US9362617B2 (en) 1999-09-20 2016-06-07 Fractus, S.A. Multilevel antennae
US9905940B2 (en) 1999-10-26 2018-02-27 Fractus, S.A. Interlaced multiband antenna arrays
US8228256B2 (en) 1999-10-26 2012-07-24 Fractus, S.A. Interlaced multiband antenna arrays
US7932870B2 (en) 1999-10-26 2011-04-26 Fractus, S.A. Interlaced multiband antenna arrays
US8896493B2 (en) 1999-10-26 2014-11-25 Fractus, S.A. Interlaced multiband antenna arrays
US8471772B2 (en) 2000-01-19 2013-06-25 Fractus, S.A. Space-filling miniature antennas
US10355346B2 (en) 2000-01-19 2019-07-16 Fractus, S.A. Space-filling miniature antennas
US8610627B2 (en) 2000-01-19 2013-12-17 Fractus, S.A. Space-filling miniature antennas
US8558741B2 (en) 2000-01-19 2013-10-15 Fractus, S.A. Space-filling miniature antennas
US8212726B2 (en) 2000-01-19 2012-07-03 Fractus, Sa Space-filling miniature antennas
US8207893B2 (en) 2000-01-19 2012-06-26 Fractus, S.A. Space-filling miniature antennas
US9331382B2 (en) 2000-01-19 2016-05-03 Fractus, S.A. Space-filling miniature antennas
US6809692B2 (en) 2000-04-19 2004-10-26 Advanced Automotive Antennas, S.L. Advanced multilevel antenna for motor vehicles
US8228245B2 (en) 2001-10-16 2012-07-24 Fractus, S.A. Multiband antenna
US7920097B2 (en) 2001-10-16 2011-04-05 Fractus, S.A. Multiband antenna
US8723742B2 (en) 2001-10-16 2014-05-13 Fractus, S.A. Multiband antenna
US9755314B2 (en) 2001-10-16 2017-09-05 Fractus S.A. Loaded antenna
US6876320B2 (en) 2001-11-30 2005-04-05 Fractus, S.A. Anti-radar space-filling and/or multilevel chaff dispersers
ES2190749A1 (en) * 2001-11-30 2003-08-01 Fractus Sa Dispersers "chaff" multilevel and / or "space-filling" against radar
US9099773B2 (en) 2006-07-18 2015-08-04 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US9899727B2 (en) 2006-07-18 2018-02-20 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices
US8738103B2 (en) 2006-07-18 2014-05-27 Fractus, S.A. Multiple-body-configuration multimedia and smartphone multifunction wireless devices

Also Published As

Publication number Publication date
GB8802963D0 (en) 1988-06-02

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)