US3886549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intrusion detection system
Assignee: SOUTHWEST MICROWAVE Inc A CORP OF
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Filing: 1973-06-07
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Granted: 1975-05-27
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Expires: 1993-06-07
Abstract
Abstract An intrusion detection system including a microwave transmitter for generating plane polarized microwave energy, a microwave antenna which is adapted for radiation and reception of the microwave energy in a predetermined pattern, a duplexer for converting the plane polarized energy from the transmitter into circularly polarized energy for radiation from the antenna and for converting received circularly polarized energy reflected from an object into plane polarized energy having an electric field which is orthogonal to the electric field of the energy from the transmitter, a mixer for mixing the received microwave energy and a small portion of the microwave energy generated by the transmitter to provide a signal having a component representative of the doppler effect, and a receiver for detecting the doppler component to provide a signal representative thereof. The signal representative of the doppler effect is received by a signal processor which converts the signal to a square wave signal of like frequency and integrates the square wave signal to provide an integral signal which, upon attaining a predetermined level, indicates the presence of an intruder. The antenna preferably consists of a parabolic reflector and a splash plate and has identical patterns of radiation and reception so as to generally delineate the area of surveillance of the intrusion detecting system. Preferably, the splash plate is a metallic foil which is affixed to a dielectric support member and which is configured to provide the desired pattern of radiation and reception.
Inventors
- 👤 James Cheal
- 👤 Vincent J Mchenry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:58
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/56
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
169 words
An intrusion detecting system comprising: antenna means for receiving electromagnetic energy including a reflector, a dielectric member having an exposed end surface for removably supporting at least one of a plurality of interchangeable antenna elements of thin metallic material on said end surface and at least partially covering said end surface having a configuration which is the part of or the whole of a circular configuration in a location relative to said reflector so that said received electromagnetic energy is directed by said reflector to said one antenna element, said reflector cooperating with any one of said interchangeable antenna elements for providing a reception pattern of predetermined configuration with the predetermined configuration provided by respective ones of said interchangeable antenna elements substantially differing each from the other to thereby provide substantially differing areas of surveillance of said intrusion detecting system; and means associated with said antenna means for detecting a low frequency component of said received electromagnetic energy for providing an output signal which is indicative of an intrusion.
Claim 2
Dependent Claim
169 words
An intrusion detecting system comprising: antenna means for receiving electromagnetic energy including a reflector, a dielectric member having an exposed end surface for removably supporting at least one of a plurality of interchangeable antenna elements of thin metallic material on said end surface and at least partially covering said end surface having a configuration which is the part of or the whole of a circular configuration in a location relative to said reflector so that said received electromagnetic energy is directed by said reflector to said one antenna element, said reflector cooperating with any one of said interchangeable antenna elements for providing a reception pattern of predetermined configuration with the predetermined configuration provided by respective ones of said interchangeable antenna elements substantially differing each from the other to thereby provide substantially differing areas of surveillance of said intrusion detecting system; and means associated with said antenna means for detecting a low frequency component of said received electromagnetic energy for providing an output signal which is indicative of an intrusion.
Claim 3
Dependent Claim
57 words
An intrusion detecting system according to claim 1 further including means associated with said antenna means for generating electromagnetic energy for radiation of said generated electromagnetic energy from said antenna means, and wherein said antenna means is provided with a radiation pattern of the predetermined configuration of said reception pattern by said at least one antenna element.
Claim 4
Dependent Claim
21 words
An intrusion detecting system acCording to claim 2 wherein said electromagnetic energy received by said antenna is within the microwave range.
Claim 5
Dependent Claim
19 words
An intrusion detecting system according to claim 3 wherein said one antenna element has a full solid circular configuration.
Claim 6
Dependent Claim
24 words
An intrusion detecting system according to claim 3 wherein said one antenna element has a configuration which is a portion of a solid circle.
Claim 7
Dependent Claim
24 words
An intrusion detecting system according to claim 3 wherein said one antenna element is at least partially defined by inner and outer concentric circles.
Claim 8
Dependent Claim
23 words
An intrusion detecting system according to claim 6 wherein said one antenna element is wholly defined by said inner and outer concentric circles.
Claim 9
Dependent Claim
21 words
An intrusion detecting system according to claim 1 wherein said electromagnetic energy received by said antenna is within the microwave range.
Claim 10
Dependent Claim
29 words
An intrusion detecting system according to claim 1 wherein said reflector is a dish-type reflector and said one antenna element is a splash plate associated with said dish-type reflector.
Claim 11
Dependent Claim
19 words
An intrusion detecting system according to claim 9 wherein said dish-type reflector includes a portion which is substantially parabolic.
Claim 12
Dependent Claim
19 words
An intrusion detecting system according to claim 1 wherein said one antenna element has a full solid circular configuration.
Claim 13
Dependent Claim
24 words
An intrusion detecting system according to claim 1 wherein said one antenna element has a configuration which is a portion of a solid circle.
Claim 14
Dependent Claim
24 words
An intrusion detecting system according to claim 1 wherein said one antenna element is at least partially defined by inner and outer concentric circles.
Claim 15
Dependent Claim
23 words
An intrusion detecting system according to claim 13 wherein said one antenna element is wholly defined by said inner and outer concentric circles.
Claim 16
Dependent Claim
19 words
An intrusion detecting system according to claim 1 wherein said metallic sheet is removably affixed to said dielectric member.
Claim 17
Dependent Claim
21 words
An intrusion detecting system according to claim 1 wherein said splash plate is affixed to said dielectric member by an adhesive.
Claim 18
Dependent Claim
171 words
An intrusion detecting system comprising: antenna means including a reflector substantially aligned with an axis for reflecting electromagnetic energy, at least one of a plurality of interchangeable antenna elements, at least one of said antenna elements including a portion which is aligned with said axis, and a dielectric member having a side surface generally parallelly aligned with said axis for supporting each of said plurality of interchangeable elements in cooperative position with respect to said reflector for receiving electromagnetic energy reflected by said reflector, at least one of said interchangeable elements being supportable on said side surface, each of said interchangeable antenna elements providing a reception pattern of predetermined configuration with the predetermined configuration provided by respective ones of said interchangeable antenna elements substantially differing each from the other to thereby provide substantially differing areas of surveillance of said intrusion detecting system; and means associated with said antenna means for detecting a low frequency component of said received electromagnetic energy for providing an output signal which is indicative of an intrusion.
Claim 19
Dependent Claim
171 words
An intrusion detecting system comprising: antenna means including a reflector substantially aligned with an axis for reflecting electromagnetic energy, at least one of a plurality of interchangeable antenna elements, at least one of said antenna elements including a portion which is aligned with said axis, and a dielectric member having a side surface generally parallelly aligned with said axis for supporting each of said plurality of interchangeable elements in cooperative position with respect to said reflector for receiving electromagnetic energy reflected by said reflector, at least one of said interchangeable elements being supportable on said side surface, each of said interchangeable antenna elements providing a reception pattern of predetermined configuration with the predetermined configuration provided by respective ones of said interchangeable antenna elements substantially differing each from the other to thereby provide substantially differing areas of surveillance of said intrusion detecting system; and means associated with said antenna means for detecting a low frequency component of said received electromagnetic energy for providing an output signal which is indicative of an intrusion.
Claim 20
Dependent Claim
125 words
An intrusion detecting system comprising: antenna means for receiving electromagnetic energy including a reflector aligned with an axis, means having a cylindrical surface for removably supporting a pair of antenna elements substantially aligned with said axis and in a location relative to said reflector so that said received electromagnetic energy is directed by said reflector to said pair of antenna elements, said pair of antenna elements having at least partially a cylindrical configuration in accordance with said cylindrical surface, said reflector cooperating with said pair of antenna elements for providing a reception pattern of predetermined configuration; and means associated with said antenna means for deteCting a low frequency component of said received electromagnetic energy for providing an output signal which is indicative of an intrusion.
Claim 21
Dependent Claim
125 words
An intrusion detecting system comprising: antenna means for receiving electromagnetic energy including a reflector aligned with an axis, means having a cylindrical surface for removably supporting a pair of antenna elements substantially aligned with said axis and in a location relative to said reflector so that said received electromagnetic energy is directed by said reflector to said pair of antenna elements, said pair of antenna elements having at least partially a cylindrical configuration in accordance with said cylindrical surface, said reflector cooperating with said pair of antenna elements for providing a reception pattern of predetermined configuration; and means associated with said antenna means for deteCting a low frequency component of said received electromagnetic energy for providing an output signal which is indicative of an intrusion.
Claim 22
Dependent Claim
23 words
An intrusion detecting system according to claim 18 wherein said pair of antenna elements are diametrically disposed with respect to said cylindrical surface.
Claim 23
Dependent Claim
230 words
An intrusion detecting system comprising: antenna means including a dish-type reflector which is aligned with an axis for reflecting electromagnetic energy, at least one of a plurality of interchangeable splash plate antenna elements associated with said dish-type reflector which essentially consists of at least one thin metallic sheet, said one having first and second splash plates defining portions of a cylindrical surface, and a dielectric member for supporting each of said plurality of interchangeable elements in cooperative position with respect to said reflector for receiving electromagnetic energy reflected by said reflector, each of said interchangeable antenna elements providing a reception pattern of predetermined configuration with the predetermined configuration provided by respective ones of said interchangeable antenna elements substantially differing each from the other to thereby provide substantially differing areas of surveillance of said intrusion detecting system, at least one of said antenna elements including first and second portions which are aligned with said axis; means associated with said antenna means for generating electromagnetic energy for radiation of said generated electromagnetic energy from said antenna means, and wherein said antenna means is provided with a radiation pattern of the predetermined configuration of said reception pattern by said at least one antenna element; and means associated with said antenna means for detecting a low frequency component of said received electromagnetic energy for providing an output signal which is indicative of an intrusion.
Claim 24
Dependent Claim
230 words
An intrusion detecting system comprising: antenna means including a dish-type reflector which is aligned with an axis for reflecting electromagnetic energy, at least one of a plurality of interchangeable splash plate antenna elements associated with said dish-type reflector which essentially consists of at least one thin metallic sheet, said one having first and second splash plates defining portions of a cylindrical surface, and a dielectric member for supporting each of said plurality of interchangeable elements in cooperative position with respect to said reflector for receiving electromagnetic energy reflected by said reflector, each of said interchangeable antenna elements providing a reception pattern of predetermined configuration with the predetermined configuration provided by respective ones of said interchangeable antenna elements substantially differing each from the other to thereby provide substantially differing areas of surveillance of said intrusion detecting system, at least one of said antenna elements including first and second portions which are aligned with said axis; means associated with said antenna means for generating electromagnetic energy for radiation of said generated electromagnetic energy from said antenna means, and wherein said antenna means is provided with a radiation pattern of the predetermined configuration of said reception pattern by said at least one antenna element; and means associated with said antenna means for detecting a low frequency component of said received electromagnetic energy for providing an output signal which is indicative of an intrusion.
Claim 25
Dependent Claim
42 words
An intrusion detecting system according to claim 20 wherein said reflector is aligned with an axis, and said first-mentioned splash plate and said second splash plate are aligned with said axis and are diametrically disposed with respect to said defined cylindrical surface.
Claim 26
Dependent Claim
22 words
An intrusion detectings system according to claim 21 wherein said first-mentioned splash plate and said second splash plate have a rectangular configuration.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |