GB2106717A - A self-erecting waveguide antenna - Google Patents

A self-erecting waveguide antenna Download PDF

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Publication number
GB2106717A
GB2106717A GB8128676A GB8128676A GB2106717A GB 2106717 A GB2106717 A GB 2106717A GB 8128676 A GB8128676 A GB 8128676A GB 8128676 A GB8128676 A GB 8128676A GB 2106717 A GB2106717 A GB 2106717A
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GB
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Application
Patent type
Prior art keywords
self
erecting
bung
body portion
radio
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
GB8128676A
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GB2106717B (en )
Inventor
Raymond Passmore
Denis Victor Butler
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.)
Plessey Co Ltd
Original Assignee
Plessey Co Ltd
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

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/08Means for collapsing antennas or parts thereof
    • H01Q1/085Flexible aerials; Whip aerials with a resilient base

Abstract

A self-erecting waveguide antenna (2) comprises a body portion (4); a flat spring sheet coil (6) which is secured at one end to the body portion, which forms a continuous tubular surface in the erected condition of the antenna (Fig 2, 3, not shown), which is collapsible for storage, and which is extendible to an operative position by energy stored in the collapsed coil; and a bung (8) which is made of a radio transparent dielectric material and which is for preventing the ingress of unwanted foreign material into the body portion and the coil, the bung being provided with a radio reflective surface, and the radio reflective surface being provided in predetermined positions and in predetermined shapes for enabling a predetermined radio transmission or reception pattern to be obtained from the bung. <IMAGE>

Description

SPECIFICATION A self-erecting waveguide antenna This invention relates to a self-erecting waveguide antenna.

Waveguide antennae are well known and they are usually employed to raise the point of radar emission or reception above a transmitting or receiving source. Thus, for example, it may be desirable to raise the point of radar emission or reception above the source when the source is on the surface of a sea. The source may be, for example, a magnetron.

It is an aim of the present invention to provide a waveguide antenna which is self-erecting and which is able to emit a predetermined radio surface emission pattern due to a particularly simple and yet highly efficient mechanical construction.

Accordingly, this invention provides a selferecting waveguide antenna which comprises a body portion; a flat spring sheet coil which is secured at one end to the body portion, which forms a continuous tubular surface in the erected condition of the antenna; which is collapsible for storage, and which is extendible to an operative position by energy stored in the collapsed coil; and bung means which is made of a radio transparent dielectric material and which is for preventing the ingress of unwanted foreign material into the body portion and the coil, the bung means being provided with a radio reflective surface, and the radio reflective surface being provided in predetermined positions and in predetermined shapes for enabling a predetermined radio transmission or reception pattern to be obtained from the bung means.

Preferably, the body portion is a tube.

The flat spring sheet coil may be pivotally secured to the body portion.

Preferably, the bung means is hollow with one end closed and one end open. The bung means will usually have the same cross sectional shape as the body portion.

The radio reflective surface on the bung means may be in the form of a coating. The coating may be formed by electro-deposition, by painting or by spraying.

Alternatively, the radio reflective surface on the bung means may be in the form of a separate sheet of material. The sheet of material may be wound around or stuck in desired positions and shapes to the remainder of the bung means.

The radio reflective surface may be constituted by a metal, for example aluminium, or by some nonmetallic materials, for example plastics materials.

The flat spring sheet coil may be pivotally secured to the bung means at its end remote from the body portion.

The flat spring sheet coil may be made of stainless steel or bronze. Various other materials may be employed for the flat spring sheet coil but the materials employed should not corrode or otherwise quickly deteriorate under the conditions of use which may involve, for example, exposure to sea water.

Preferably, the flat spring sheet coil is collapsible for storage into the body portion. A compact construction is thereby achieved.

Advantageously, the self-erecting waveguide antenna includes limiting means for limiting the extension of the flat spring sheet coil from the body portion.

The limiting means may be a cord which is fixed at one end to the body portion and which is fixed at its other end to the end of the flat spring sheet coil which is remote from the body portion.

An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawings in which: Figure 1 is a section through a self-erecting waveguide antenna in a collapsed condition; Figure 2 shows part of the antenna of Figure 1 in an extended erected condition; and Figure 3 shows a further part of the antenna of Figure 1 in the extended erected condition.

Referring to the drawings, there is shown a self-erecting waveguide antenna 2 which comprises a body portion in the form of a radio outlet tube 4, a flat spring sheet coil 6 and a bung 8.

The coil 6 is secured at its left hand end as viewed in Figure 1 to the tube 4 by a pintle 10. The pintle 10 enables the coil 6 to be pivotally connected to the tube 4. As shown in Figure 1, the coil 6 collapses for storage within the tube 4 so that the antenna 2 is very compact. As shown in Figures 2 and 3, the coil extends out of the tube 4 to an extended erected condition and in the extended erected condition, a continuous tubular surface is formed as shown.

The bung 8 is hollow and it is open at one end 12 and closed at its other end 14. The right hand end of the coil 6 as viewed in the drawings is pivotally secured to the bung 8 by means of a dielectric pintle 16. The bung 8 is made of a radio transparent dielectric material which is provided with a coating of a radio reflective material, for example aluminium, so that the bung 8 has a radio reflective surface. This radio reflective surface is removed in predetermined places such for example as the circular place 18, for enabling a predetermined radio surface emission pattern to be transmitted from the bung 8. The size and shape of the place 18 can be varied as desired to give the desired predetermined radio surface emission pattern. For example, the bung 8 can be arranged to give both axial and lateral radio emissions.

The coil 6 is extendible from its collapsed condition to its extended erected condition due to the strain energy in the flat spring sheet which forms the coil 6. In order that the coil 6 does not extend too far out of the tube 4 and possibly become too floppy, the antenna 2 is provided with limiting means in the form of an extension limiting cord 20. The cord 20 is provided with a knot 22 at one end and then the cord 20 is passed through an aperture 24 in a pintle 26 provided in the tube 4. The other end of the cord 20 passes through an aperture 28 in the pintle 16 and is provided with a knot 30. The cord 20 thus limits the possible extension of the coil 6.

The antenna 2 is such that the coil 6 forms a convenient means of enabling the antenna 2 to be self-erecting. The antenna 2 can be used from a storage condition in which the coil 6 will be in its collapsed form as shown in Figure 1 and the coil 6 will self erect once outer packaging or other means for containing the coil 6 in its collapsed condition is released. The removal of the radio reflective surface to give the place or places 18 for enabling the required predetermined radio surface emission pattern to be transmitted from the bung 8 provides an exceptionally easy way of obtaining desired radio surface emission patterns. It will be appreciated that the removal of the plating can be easily undertaken or, alternatively, the bung 8 can be masked whilst the plating is being undertaken to avoid the need for its subsequent removal in unwanted places.It will thus be appreciated that the easy removal of the radio reflective surface or the easy masking of the radio reflective surfacing areas where it is not wanted is far superior to, or example, cutting holes in a bung 8 made of a radio reflective material since the bung 8 would then become structurally weakened.

It is to be appreciated that the embodiment of the invention described above has been given by way of example only and that modifications may be effected. Thus, for example, antenna 2 can receive as well as transmit. If desired, the radio reflective coating could be constituted by separate sheeting which could be wound and/or stuck around the bung 8.

CLAIMS (Filed on 12 July 1982) 1. A self-erecting waveguide antenna which comprises a body portion; a flat spring sheet coil which is secured at one end to the body portion, which forms a continuous tubular surface in the erected condition of the antenna, which is collapsible for storage, and which is extendible to an operative position by energy stored in the collapsed coil; and bung means which is made of a radio transparent dielectric material and which is for preventing the ingress of unwanted foreign material into the body portion and the coil, the bung means being provided with a radio reflective surface, and the radio reflective surface being provided in predetermined positions and in predetermined shapes for enabling a predetermined radio transmission or reception pattern to be obtained from.

2. A self-erecting waveguide antenna according to claim 1 in which the body portion is a tube.

3. A self-erecting waveguide antenna according to claim 1 or claim 2 in which the flat spring sheet coil is pivotally secured to the body portion.

4. A self-erecting waveguide antenna according to any one of the preceding claims in which the bung means is hollow with one end closed and one end open.

5. A self-erecting waveguide antenna according to claim 4 in which the bung means has the same cross sectional shape as the body portion.

6. A self-erecting waveguide antenna according to any one of the preceding means in which the radio reflective surface on the bung means is in the form of a coating.

7. A self-erecting waveguide antenna according to claim 6 in which the coating is formed by electro-deposition, by painting or by spraying.

8. A self-erecting waveguide antenna according to any one of claims 1 to 5 in which the radio reflective surface on the bung means is in the form of a separate sheet of material.

9. A self-erecting waveguide antenna according to any one of the preceding claims in which the flat spring sheet coil is pivotally secured to the bung means at its end remote from the body portion.

10. A self-erecting waveguide antenna according to any one of the preceding claims in which the flat spring sheet coil is collapsible for storage into the body portion.

11. A self erecting waveguide antenna according to any one of the preceding claims and including limiting means for limiting the extension of the flat spring sheet coil from the body portion.

12. A self-erecting waveguide antenna according to claim 11 in which the limiting means is a cord which is fixed at one end to the body portion and which is fixed at its other end to the end of the flat spring sheet coil which is remote from the body portion.

13. A self-erecting waveguide antenna substantially as herein described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. storage condition in which the coil 6 will be in its collapsed form as shown in Figure 1 and the coil 6 will self erect once outer packaging or other means for containing the coil 6 in its collapsed condition is released. The removal of the radio reflective surface to give the place or places 18 for enabling the required predetermined radio surface emission pattern to be transmitted from the bung 8 provides an exceptionally easy way of obtaining desired radio surface emission patterns. It will be appreciated that the removal of the plating can be easily undertaken or, alternatively, the bung 8 can be masked whilst the plating is being undertaken to avoid the need for its subsequent removal in unwanted places.It will thus be appreciated that the easy removal of the radio reflective surface or the easy masking of the radio reflective surfacing areas where it is not wanted is far superior to, or example, cutting holes in a bung 8 made of a radio reflective material since the bung 8 would then become structurally weakened. It is to be appreciated that the embodiment of the invention described above has been given by way of example only and that modifications may be effected. Thus, for example, antenna 2 can receive as well as transmit. If desired, the radio reflective coating could be constituted by separate sheeting which could be wound and/or stuck around the bung 8. CLAIMS (Filed on 12 July 1982)
1. A self-erecting waveguide antenna which comprises a body portion; a flat spring sheet coil which is secured at one end to the body portion, which forms a continuous tubular surface in the erected condition of the antenna, which is collapsible for storage, and which is extendible to an operative position by energy stored in the collapsed coil; and bung means which is made of a radio transparent dielectric material and which is for preventing the ingress of unwanted foreign material into the body portion and the coil, the bung means being provided with a radio reflective surface, and the radio reflective surface being provided in predetermined positions and in predetermined shapes for enabling a predetermined radio transmission or reception pattern to be obtained from.
2. A self-erecting waveguide antenna according to claim 1 in which the body portion is a tube.
3. A self-erecting waveguide antenna according to claim 1 or claim 2 in which the flat spring sheet coil is pivotally secured to the body portion.
4. A self-erecting waveguide antenna according to any one of the preceding claims in which the bung means is hollow with one end closed and one end open.
5. A self-erecting waveguide antenna according to claim 4 in which the bung means has the same cross sectional shape as the body portion.
6. A self-erecting waveguide antenna according to any one of the preceding means in which the radio reflective surface on the bung means is in the form of a coating.
7. A self-erecting waveguide antenna according to claim 6 in which the coating is formed by electro-deposition, by painting or by spraying.
8. A self-erecting waveguide antenna according to any one of claims 1 to 5 in which the radio reflective surface on the bung means is in the form of a separate sheet of material.
9. A self-erecting waveguide antenna according to any one of the preceding claims in which the flat spring sheet coil is pivotally secured to the bung means at its end remote from the body portion.
10. A self-erecting waveguide antenna according to any one of the preceding claims in which the flat spring sheet coil is collapsible for storage into the body portion.
11. A self erecting waveguide antenna according to any one of the preceding claims and including limiting means for limiting the extension of the flat spring sheet coil from the body portion.
12. A self-erecting waveguide antenna according to claim 11 in which the limiting means is a cord which is fixed at one end to the body portion and which is fixed at its other end to the end of the flat spring sheet coil which is remote from the body portion.
13. A self-erecting waveguide antenna substantially as herein described with reference to the accompanying drawings.
GB8128676A 1981-09-22 1981-09-22 A self-erecting waveguide antenna Expired GB2106717B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8128676A GB2106717B (en) 1981-09-22 1981-09-22 A self-erecting waveguide antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8128676A GB2106717B (en) 1981-09-22 1981-09-22 A self-erecting waveguide antenna

Publications (2)

Publication Number Publication Date
GB2106717A true true GB2106717A (en) 1983-04-13
GB2106717B GB2106717B (en) 1985-07-03

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ID=10524679

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8128676A Expired GB2106717B (en) 1981-09-22 1981-09-22 A self-erecting waveguide antenna

Country Status (1)

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GB (1) GB2106717B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2331630A (en) * 1997-11-20 1999-05-26 Nec Technologies Retractable antenna for a mobile telephone

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2331630A (en) * 1997-11-20 1999-05-26 Nec Technologies Retractable antenna for a mobile telephone
US6054960A (en) * 1997-11-20 2000-04-25 Nec Corporation Retractable antenna for a mobile telephone
GB2331630B (en) * 1997-11-20 2001-12-05 Nec Technologies Retractable antenna for a mobile telephone

Also Published As

Publication number Publication date Type
GB2106717B (en) 1985-07-03 grant

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PCNP Patent ceased through non-payment of renewal fee