US5604925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Super low noise multicoupler
Assignee: OL Security LLC
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Filing: 1995-04-28
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Granted: 1997-02-18
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Expires: 2015-04-28
Abstract
Abstract A method and multicoupler for a receiver at a base station in a cellular/PCS radio communication system includes a cooled container that is mounted on an antenna tower at the base station. The container is mounted on the antenna tower adjacent an antenna and contains thereinside a preselector filter, a highly linear amplifier, and a directional coupler that are cooled to a temperature less than 175° K. and greater than 100° K. A power splitter is connected between the output from the container and the radio system receiver, and is located at a ground station near the base of the antenna tower. Cooling the components inside the container, particularly the amplifier, to a temperature of about 150° K. reduces the noise from the multicoupler so that base station range is extended, building penetration is improved, and subscriber transmit power may be reduced. The multicoupler may also be used for duplex channels, and in this event a transmit filter may also be cooled to reduce transmit power dissipation by the filter.
Inventors
- 👤 John P. O'Malley
- 👤 William J. Rinard
- 👤 Rodney O. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:10
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H01; H01Q; H01Q1/00; H01Q1/02; H04B1/02; H04B1/03; H04B1/036
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
117 words
A multicoupler for a receiver at a base station in a radio communication system, the base station having an antenna tower and a ground station adjacent a base of the antenna tower, said multicoupler comprising: a cooled container on the antenna tower adjacent an antenna, said cooled container comprising thereinside, a preselector filter connected to a feed from the antenna, and a highly linear amplifier connected to said filter and to an output from said cooled container; and a refrigeration unit for cooling said filter, said amplifier and connections therebetween to a temperature less than 175° K. and greater than 100° K.; and a power splitter connected between said output from said cooled container and the receiver.
Claim 2
Dependent Claim
117 words
A multicoupler for a receiver at a base station in a radio communication system, the base station having an antenna tower and a ground station adjacent a base of the antenna tower, said multicoupler comprising: a cooled container on the antenna tower adjacent an antenna, said cooled container comprising thereinside, a preselector filter connected to a feed from the antenna, and a highly linear amplifier connected to said filter and to an output from said cooled container; and a refrigeration unit for cooling said filter, said amplifier and connections therebetween to a temperature less than 175° K. and greater than 100° K.; and a power splitter connected between said output from said cooled container and the receiver.
Claim 3
Dependent Claim
14 words
The multicoupler of claim 1 wherein said power splitter is at the ground station.
Claim 4
Dependent Claim
37 words
The multicoupler of claim 2 further comprising a second amplifier at the ground station that is connected between said output from said cooled container and said power splitter for increasing received signal gain without significantly increasing noise.
Claim 5
Dependent Claim
54 words
The multicoupler of claim 1 further comprising inside said cooled container a second preselector filter connected to a feed from a second antenna, and a second highly linear amplifier connected to a second output from said cooled container, and a second power splitter that is connected to said second output from said cooled container.
Claim 6
Dependent Claim
22 words
The multicoupler of claim 1 wherein said filter comprises one of a cavity filter with plural sections, or a ceramic puck filter.
Claim 7
Dependent Claim
18 words
The multicoupler of claim 1 further comprising a coupler connected to said filter for injecting a test signal.
Claim 8
Dependent Claim
15 words
The multicoupler of claim 6 wherein said coupler comprises a parallel coupled rod type coupler.
Claim 9
Dependent Claim
17 words
The multicoupler of claim 1 wherein said amplifier comprises one of a MESFET, HEMT and MMIC amplifier.
Claim 10
Dependent Claim
12 words
The multicoupler of claim 1 wherein said temperature is about 150° K.
Claim 11
Dependent Claim
33 words
The multicoupler of claim 1 wherein said refrigeration unit comprises a closed-system cooler, and means for maintaining a predetermined temperature within the range of less than 175° K. and greater than 100° K.
Claim 12
Dependent Claim
41 words
The multicoupler of claim 1 wherein said filter comprises a transmit filter and receive filter, and further comprising means for isolating said receive filter from a source of transmit power, whereby the multicoupler is for operation in a duplex antenna system.
Claim 13
Dependent Claim
112 words
An antenna tower-mounted multicoupler for a receiver in a cellular/PCS radio communication system, said multicoupler comprising: a first, highly linear, amplifier on an antenna tower adjacent an antenna, said first amplifier being connected to a feed from the antenna; a refrigeration unit adjacent said first amplifier on the antenna tower for cooling said first amplifier to a predetermined temperature between 175° K., and 100° K. so that noise from said first amplifier is reduced; and means for providing a radio signal received at the antenna from said first amplifier to a receiver, said means for providing and the receiver being located at a ground station adjacent a base of the antenna tower.
Claim 14
Dependent Claim
112 words
An antenna tower-mounted multicoupler for a receiver in a cellular/PCS radio communication system, said multicoupler comprising: a first, highly linear, amplifier on an antenna tower adjacent an antenna, said first amplifier being connected to a feed from the antenna; a refrigeration unit adjacent said first amplifier on the antenna tower for cooling said first amplifier to a predetermined temperature between 175° K., and 100° K. so that noise from said first amplifier is reduced; and means for providing a radio signal received at the antenna from said first amplifier to a receiver, said means for providing and the receiver being located at a ground station adjacent a base of the antenna tower.
Claim 15
Dependent Claim
40 words
The multicoupler of claim 12 further comprising a transmit filter and a parallel connected receive filter that are connected between said first amplifier and the antenna feed and cooled by said refrigeration unit for enabling duplex operation of the multicoupler.
Claim 16
Dependent Claim
19 words
The multicoupler of claim 13 further comprising means for isolating said receive filter from a source of transmit power.
Claim 17
Dependent Claim
45 words
The multicoupler of claim 12 further comprising a second, uncooled, amplifier at the ground station, said second amplifier being connected between said first amplifier and the receiver, said second amplifier for increasing the gain of the signal from said first amplifier without significantly increasing noise.
Claim 18
Dependent Claim
22 words
The multicoupler of claim 15 wherein said means for providing comprises a power splitter connected between said second amplifier and the receiver.
Claim 19
Dependent Claim
29 words
The multicoupler of claim 16 further comprising a preselector filter connected between the feed from the antenna and said first amplifier adjacent said refrigeration unit with said first amplifier.
Claim 20
Dependent Claim
29 words
The multicoupler of claim 17 further comprising a directional coupler for injecting a test signal that is connected between said filter and said first amplifier adjacent said refrigeration unit.
Claim 21
Independent Claim
128 words
A method of increasing sensitivity of a receiver at a base station in a radio communication system, the base station having an antenna tower and a ground station adjacent a base of the antenna tower, the method comprising the steps of: (a) providing a cooled container on the antenna tower adjacent an antenna; (b) providing inside the cooled container, a filter connected to a feed from the antenna, and a highly linear first amplifier connected to an output from the cooled container; and (c) cooling the filter, the first amplifier, and connections therebetween that are inside the cooled container to a predetermined temperature less than 175° K. and greater than 100° K.; and (d) connecting a power splitter between the output from the cooled container and the receiver.
Claim 22
Independent Claim
128 words
A method of increasing sensitivity of a receiver at a base station in a radio communication system, the base station having an antenna tower and a ground station adjacent a base of the antenna tower, the method comprising the steps of: (a) providing a cooled container on the antenna tower adjacent an antenna; (b) providing inside the cooled container, a filter connected to a feed from the antenna, and a highly linear first amplifier connected to an output from the cooled container; and (c) cooling the filter, the first amplifier, and connections therebetween that are inside the cooled container to a predetermined temperature less than 175° K. and greater than 100° K.; and (d) connecting a power splitter between the output from the cooled container and the receiver.
Claim 23
Dependent Claim
53 words
The method of claim 19 further comprising the step of providing a second, uncooled, amplifier at the ground station, the second amplifier being connected between the output of the cooled container and the power splitter, the second amplifier for increasing the gain of the signal from the first amplifier without significantly increasing noise.
Claim 24
Dependent Claim
38 words
The method of claim 19 wherein the filter includes a transmit filter and a parallel connected receive filter, and further comprising the step of isolating the receive filter from a source of transmit power, for enabling duplex operation.
Claim 25
Dependent Claim
21 words
The method of claim 19 wherein the filter comprises one of a cavity filter with plural sections, or ceramic puck filter.
Claim 26
Dependent Claim
27 words
The method of claim 19 further comprising the step of providing a directional rod type coupler between the antenna and the amplifier for injecting a test signal.
Claim 27
Dependent Claim
17 words
The method of claim 19 wherein the amplifier comprises one of a MESFET, HEMT and MMIC amplifier.
Claim 28
Dependent Claim
13 words
The method of claim 19 wherein the predetermined temperature is about 150° K.
Claim 29
Dependent Claim
28 words
The method of claim 19 further comprising the step of providing a closed-system cooler for cooling the cooled container, the cooler having means for selecting the predetermined temperature.
References Cited (Backward Citations)
US3564546A
Cited
US3389352A
Cited
US3644803A
Cited
US3902143A
Cited
SU566282A1
Cited
US4585999A
Cited
US4763132A
Cited
US5093311A
Cited
US5006825A
Cited
US4799067A
Cited
US5244869A
Cited
US5262395A
Cited
US5378999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-18 | 2000-08-19 | 2001-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-18 | 2004-08-19 | 2005-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-18 | 2008-08-19 | 2009-02-18 | $7700.00 | Window Closed / Lapsed |