GB2338114A - Aerials - Google Patents
Aerials Download PDFInfo
- Publication number
- GB2338114A GB2338114A GB9812177A GB9812177A GB2338114A GB 2338114 A GB2338114 A GB 2338114A GB 9812177 A GB9812177 A GB 9812177A GB 9812177 A GB9812177 A GB 9812177A GB 2338114 A GB2338114 A GB 2338114A
- Authority
- GB
- United Kingdom
- Prior art keywords
- aerial
- helical coil
- retracted
- telephone
- antenna
- 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- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
- H01Q1/244—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas extendable from a housing along a given path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/08—Means for collapsing antennas or parts thereof
- H01Q1/10—Telescopic elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/40—Radiating elements coated with or embedded in protective material
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Set Structure (AREA)
Abstract
An antenna for a mobile phone includes a helical coil 6 and a telescopic section (2 and 3). The antenna is configured such that when telescopic section is retracted into the case of a mobile phone a collar 5 on prevents the helical coil from being retracted too. A screw fastener 4 allows the aerial to be attached to the circuit of the telephone. Because helical coil 6 is not retracted within the case the antenna 1 always has a significant effective length. A resilient coating 7 is provided over helical coil 6 in order to protect it.
Description
1 2338114 Aerials This invention relates to aerials.
UK cordless telephones were at one time devised to comply with Radiocommunications; Agency Standard MPT 1.322. The handsets for these telephones were provided with two aerials. A first aerial built into the handset received signals from the base unit. This aerial comprises, typically, a tuned ferrite rod of the Idnd often used in AM radio receivers. A second retractable aerial was used to transmit signal from io the handset to the base unit. Because a tuned receiving aerial was used an incoming call would be received up to the limit of the telephone's range even if the second aerial was retracted. Ile user can extend the transmitting aerial when the telephone is in use.
MPT 1322 has been replaced by MPT 1384. The MPT 1384 standard specifies different radio frequencies at which it is not practicable to use a ferrite rod. A telescopic aerial is provided for reception and transmission. This means that while the aerial is extended there is good reception and transmission but when retracted poor reception and transmission. This is a problem because the handset when remote from the base unit with the aerial retracted may not detect incoming calls.
2 The invention seeks to reduce this problem.
According to the invention there is provided an aerial for a cordless telephone comprising mounting for mounting the aerial to a receiving circuit of the telephone, a plurality of telescoping aerial sections, a helical coil aerial section, and means for preventing retraction of the helical coil into the body of a telephone.
An embodiment of the invention will be described by way of non-limiting example with reference to the accompanying figure which is a cross section of an aerial.
Aerial 1 comprises a plurality of telescoping sections 2, 3. A screw fastener 4 for attaching the aerial to a circuit of the telephone is provided. Collar 5 is provided for preventing complete retraction of the aerial into the telephone. Helical coil 6 is provided attached to a telescoping section. Coil 6 cannot be retracted since collar 5 is bigger than the aerial aperture of the telephone. A resilient coating 7 is provided over helical coil 6. Because helical coil 6 is not retractable aerial 1 always has a significant effective length. This means that the aerial is more sensitive and transimssion firom a base unit detectable at a greater distance than with a conventional retracted telescopic aerial. Use of a helical coil is advantageous since the external portion of the aerial is more flexible than if made of tube. Furthermore because a 3 helical coil has components perpendicular to one another polarised signals are more likely to be detected even if the orientation of the handset and base unit aerials is very different.
4 cl hm 1. An aerial for a cordless telephone comprising mounting for mounting the aerial to a receiving circuit of the telephone, a plurality of telescoping a-erial sections, a helical coil aerial section, and means for preventing retraction of the helical coil.
2. An aerial as claimed in claim 1 wherein the helical coil is enveloped in a resilient material.
An aerial as claimed 'm claim 1 or claim 2 wherein the means for preventing retraction comprise a collar surrounding an aerial section.
4. An aerial as claimed in claim 3 wherein the collar is provided with a screw threaded portion for mounting the aerial on a telephone.
5.
An aerial substantially as described herein by reference to the figure.
6. A cordless telephone incorporating an aerial as claimed in any one of the preceding claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9812177A GB2338114A (en) | 1998-06-05 | 1998-06-05 | Aerials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9812177A GB2338114A (en) | 1998-06-05 | 1998-06-05 | Aerials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9812177D0 GB9812177D0 (en) | 1998-08-05 |
| GB2338114A true GB2338114A (en) | 1999-12-08 |
Family
ID=10833300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9812177A Withdrawn GB2338114A (en) | 1998-06-05 | 1998-06-05 | Aerials |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2338114A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2282705A (en) * | 1993-09-09 | 1995-04-12 | Mitsubishi Electric Corp | Antenna system having plural antenna portions |
| EP0688060A1 (en) * | 1994-06-13 | 1995-12-20 | Galtronics Ltd. | Electrical antenna assembly and electrical device including same |
| GB2305782A (en) * | 1995-09-29 | 1997-04-16 | Motorola Inc | Antenna assembly for a wireless communication device |
| GB2308744A (en) * | 1995-12-22 | 1997-07-02 | Motorola Inc | Wireless communication device has impedance matching for both antenna positions |
| WO1998049747A1 (en) * | 1997-04-29 | 1998-11-05 | Galtronics Ltd. | Dual-band antenna with a single matching network |
| GB2326531A (en) * | 1997-05-07 | 1998-12-23 | Nec Corp | Capacitive coupling for combined helical and whip antenna |
-
1998
- 1998-06-05 GB GB9812177A patent/GB2338114A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2282705A (en) * | 1993-09-09 | 1995-04-12 | Mitsubishi Electric Corp | Antenna system having plural antenna portions |
| EP0688060A1 (en) * | 1994-06-13 | 1995-12-20 | Galtronics Ltd. | Electrical antenna assembly and electrical device including same |
| GB2305782A (en) * | 1995-09-29 | 1997-04-16 | Motorola Inc | Antenna assembly for a wireless communication device |
| GB2308744A (en) * | 1995-12-22 | 1997-07-02 | Motorola Inc | Wireless communication device has impedance matching for both antenna positions |
| WO1998049747A1 (en) * | 1997-04-29 | 1998-11-05 | Galtronics Ltd. | Dual-band antenna with a single matching network |
| GB2326531A (en) * | 1997-05-07 | 1998-12-23 | Nec Corp | Capacitive coupling for combined helical and whip antenna |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9812177D0 (en) | 1998-08-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |