US5337058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast switching polarization diverse radar antenna system
Assignee: Norden Systems Inc
•
Filing: 1993-04-16
•
Granted: 1994-08-09
•
Expires: 2013-04-16
Abstract
Abstract A fast switching, variably polarized lens is placed in front of a radar antenna which radiates an electromagnetic wave having any fixed polarization. The radiated electromagnetic wave is coupled to the lens and the switching elements within the lens transform the polarization of the radiated electromagnetic wave as commanded. Each transmit pulse may take on any polarization which the lens is capable of providing independent of the polarization of the previous transmit pulse. Similarly, during receive mode the lens can be set up to allow the radar system to receive a return signal of any polarization independent of the polarization of the return signal's associated transmit signal.
Inventors
- 👤 John H. Cross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:53
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q21/245; G; G01; G01S; G01S7/00; G01S7/02; G01S7/024
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
A fast switching polarization diverse radar system, comprising: a radar transmitter; a radar receiver; a transmit and receive antenna which radiates electromagnetic energy of wavelength λ received from said radar transmitter during transmit mode and receives electromagnetic energy during receive mode and routes the received energy to said radar receiver; a variable polarization lens placed over the aperture of said transmit and receive antenna at a certain distance from said transmit and receive antenna, comprising a) means for coupling said radiated electromagnetic energy to said lens and for providing a coupled electromagnetic energy signal; b) means for transforming the polarization of said coupled electromagnetic energy signal as commanded to either horizontal, vertical, circular left, circular right, elliptical left or elliptical right polarization, and for providing a variably polarized electromagnetic waveform having the commanded polarization; and c) means for radiating said variably polarized electromagnetic waveform from said lens and receiving a return signal at said lens.
Claim 2
Dependent Claim
155 words
A fast switching polarization diverse radar system, comprising: a radar transmitter; a radar receiver; a transmit and receive antenna which radiates electromagnetic energy of wavelength λ received from said radar transmitter during transmit mode and receives electromagnetic energy during receive mode and routes the received energy to said radar receiver; a variable polarization lens placed over the aperture of said transmit and receive antenna at a certain distance from said transmit and receive antenna, comprising a) means for coupling said radiated electromagnetic energy to said lens and for providing a coupled electromagnetic energy signal; b) means for transforming the polarization of said coupled electromagnetic energy signal as commanded to either horizontal, vertical, circular left, circular right, elliptical left or elliptical right polarization, and for providing a variably polarized electromagnetic waveform having the commanded polarization; and c) means for radiating said variably polarized electromagnetic waveform from said lens and receiving a return signal at said lens.
Claim 3
Dependent Claim
44 words
A radar system according to claim 1 wherein said means for radiating comprises a plurality of orthogonal radiating element pairs, wherein each of said pairs has a first radiating element and a second radiating element which are orthogonally disposed with respect to each other.
Claim 4
Dependent Claim
27 words
The radar system according to claim 2 wherein said transmit and receive antenna and said lens are spaced said certain distance of about 0.1λ to about 5λ.
Claim 5
Dependent Claim
18 words
The radar system according to claim 3 wherein said means for transforming comprises a plurality of diode switches.
Claim 6
Dependent Claim
20 words
The radar system of according to claim 3 wherein said means for transforming comprises a plurality of multi-bit phase shifters.
Claim 7
Dependent Claim
16 words
The radar system according claim 3 wherein said means for coupling comprises a plurality of dipoles.
Claim 8
Dependent Claim
19 words
The radar system according to claim 3 wherein said means for coupling comprises a plurality of probe fed slots.
Claim 9
Dependent Claim
152 words
A fast switching polarization diverse antenna system for a radar, comprising: a transmit and receive source antenna which transmits a polarized electromagnetic waveform of wavelength λ and receives a return signal electromagnetic waveform; a fast switching polarization diverse lens which is placed across the aperture of said transmit and receive antenna a fixed distance from said aperture, said lens comprising a) a plurality of coupling elements each disposed to receive said polarized electromagnetic waveform and provide a coupled electromagnetic waveform signal; b) a plurality of elements each for transforming the polarization of said coupled electromagnetic waveforms signals as commanded to either horizontal, vertical, circular left, circular right, elliptical left or elliptical right polarization, and each for providing a variably polarized electromagnetic waveform; and c) a plurality of radiating elements which each receive said variably polarized electromagnetic waveform and radiate said variably polarized electromagnetic waveform via high isolation orthogonally disposed radiating element pairs.
Claim 10
Dependent Claim
152 words
A fast switching polarization diverse antenna system for a radar, comprising: a transmit and receive source antenna which transmits a polarized electromagnetic waveform of wavelength λ and receives a return signal electromagnetic waveform; a fast switching polarization diverse lens which is placed across the aperture of said transmit and receive antenna a fixed distance from said aperture, said lens comprising a) a plurality of coupling elements each disposed to receive said polarized electromagnetic waveform and provide a coupled electromagnetic waveform signal; b) a plurality of elements each for transforming the polarization of said coupled electromagnetic waveforms signals as commanded to either horizontal, vertical, circular left, circular right, elliptical left or elliptical right polarization, and each for providing a variably polarized electromagnetic waveform; and c) a plurality of radiating elements which each receive said variably polarized electromagnetic waveform and radiate said variably polarized electromagnetic waveform via high isolation orthogonally disposed radiating element pairs.
References Cited (Backward Citations)
US3720947A
Cited
US3988732A
Cited
US3569974A
Cited
US3656165A
Cited
US3708796A
Cited
US3701160A
Cited
US3805268A
Cited
US3754271A
Cited
US3795914A
Cited
US3852762A
Cited
US3972043A
Cited
US4119932A
Cited
US4472717A
Cited
US4568943A
Cited
US4663634A
Cited
US4901086A
Cited
US4965868A
Cited
US5055805A
Cited
US5086301A
Cited
US5128637A
Cited
US5258768A
Cited
US5153601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-08 | 1998-02-07 | 1998-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-08 | 2002-02-07 | 2002-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-08 | 2006-02-07 | 2006-08-09 | $7700.00 | Window Closed / Lapsed |