US5016020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transceiver testing apparatus
Assignee: BAE Systems Electronics Ltd
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Filing: 1989-04-19
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Granted: 1991-05-14
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Expires: 2009-04-19
Abstract
Abstract Apparatus for testing a radio transceiver installation having an antenna includes a screening hood (20) adapted to be fitted over the antenna (10) of an installation to be tested; and a hood antenna (21) mounted within said hood (20) so that when the hood is in its operative position the two antennae (10, 21) form an over-coupled bandpass filter. The position of said hood antenna (21) is within adjustable hood (20) which should normally have a diameter which is approximately 0.15 wavelengths of the resonant frequency of an antenna (10) to be tested.
Inventors
- 👤 Iain F. Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:31
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/08; G01R29/10; H; H01; H01Q; H01Q1/00; H01Q1/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
Apparatus for testing a radio transceiver installation having an installation antenna that normally resonates at a resonant frequency, the apparatus comprising: (a) a grounded hood mounted on the installation and surrounding the installation antenna in a test mode, said hood being dimensioned to be non-resonant at the resonant frequency of the installation antenna, thereby lowering the resonant frequency of the installation antenna when the hood alone surrounds the installation antenna; (b) a hood antenna that normally resonates at a higher resonant frequency greater than said resonant frequency of the installation antenna, said hood antenna being mounted within the hood and being coupled to the installation antenna in the test mode to form an over-coupled bandpass filter having lower and higher frequency poles; and (c) means to adjust the higher frequency pole of the filter to be substantially coincident with said resonant frequency of the installation antenna in the test mode by varying said higher resonant frequency of the hood antenna.
Claim 2
Dependent Claim
160 words
Apparatus for testing a radio transceiver installation having an installation antenna that normally resonates at a resonant frequency, the apparatus comprising: (a) a grounded hood mounted on the installation and surrounding the installation antenna in a test mode, said hood being dimensioned to be non-resonant at the resonant frequency of the installation antenna, thereby lowering the resonant frequency of the installation antenna when the hood alone surrounds the installation antenna; (b) a hood antenna that normally resonates at a higher resonant frequency greater than said resonant frequency of the installation antenna, said hood antenna being mounted within the hood and being coupled to the installation antenna in the test mode to form an over-coupled bandpass filter having lower and higher frequency poles; and (c) means to adjust the higher frequency pole of the filter to be substantially coincident with said resonant frequency of the installation antenna in the test mode by varying said higher resonant frequency of the hood antenna.
Claim 3
Dependent Claim
30 words
Apparatus as claimed in claim 1, wherein the hood antenna has a movable part adjacent the installation antenna, and wherein said movable part is moved relative to the installation antenna.
Claim 4
Dependent Claim
32 words
Apparatus as claimed in claim 1, wherein the hood antenna has a radiating length, and wherein the adjusting means is a movable screen to adjust the radiating length of the hood antenna.
Claim 5
Dependent Claim
15 words
Apparatus as claimed in claim 1, wherein the hood is constituted of a non-magnetic material.
Claim 6
Dependent Claim
18 words
Apparatus as claimed in claim 4, wherein the hood is constituted of aluminum treated with a conductive finish.
Claim 7
Dependent Claim
16 words
Apparatus as claimed in claim 1, wherein the hood is filled with an electro-magnetically inert substance.
Claim 8
Dependent Claim
28 words
Apparatus as claimed in claim 1, wherein the hood is dimensioned to have a diameter which is approximately 0.15 wavelengths of said resonant frequency of the installation antenna.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |