IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0185251
(2002-06-27)
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발명자
/ 주소 |
- Parsche, Francis
- Killen, William D.
- Pike, Randy T.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
8 인용 특허 :
21 |
초록
▼
The invention concerns an efficient loop antenna of reduced size. The antenna is formed on a dielectric substrate disposed on a conductive ground plane. The substrate has a plurality of regions of differing substrate characteristics. An elongated conductive antenna element is arranged in the form of
The invention concerns an efficient loop antenna of reduced size. The antenna is formed on a dielectric substrate disposed on a conductive ground plane. The substrate has a plurality of regions of differing substrate characteristics. An elongated conductive antenna element is arranged in the form of a loop and disposed on a first region of the substrate. The antenna element can have first and second adjacent end portions separated by a gap. The first region of the substrate has a relative permeability that is higher as compared to a second region of the substrate on which the remainder of the circuitry is disposed. According to one aspect of the invention, the relative permeability of the first region is greater than 1.
대표청구항
▼
The invention concerns an efficient loop antenna of reduced size. The antenna is formed on a dielectric substrate disposed on a conductive ground plane. The substrate has a plurality of regions of differing substrate characteristics. An elongated conductive antenna element is arranged in the form of
The invention concerns an efficient loop antenna of reduced size. The antenna is formed on a dielectric substrate disposed on a conductive ground plane. The substrate has a plurality of regions of differing substrate characteristics. An elongated conductive antenna element is arranged in the form of a loop and disposed on a first region of the substrate. The antenna element can have first and second adjacent end portions separated by a gap. The first region of the substrate has a relative permeability that is higher as compared to a second region of the substrate on which the remainder of the circuitry is disposed. According to one aspect of the invention, the relative permeability of the first region is greater than 1. cancellation, in the frequency domain. 2. The method according to claim 1, wherein the HPRF application comprises Doppler radar.3. The method according to claim 1, wherein the jammer signal is a side lobe jammer.4. A method of suppressing jammer signals in a received signal of a radar antenna in an HPRF application, by means of Fast Fourier Transformation and side lobe cancellation, the radar antenna comprising sum, difference and auxiliary channels, said method comprising: transforming the received signal in sum, difference and auxiliary channels, from the time domain into the frequency domain using a Fast Fourier Transformation; suppressing the jammer signal by means of side lobe cancellation, in the frequency domain; wherein after the FFT, for the elimination of clutter signals, the frequency range ±2V r/λ, is filtered out of the frequency spectrum of the received signal, wherein Vris the speed of the HPRF application and λ is the wavelength of the received signal.5. A method of suppressing jammer signals in a received signal of a radar antenna in an HPRF application, by means of Fast Fourier Transformation and side lobe cancellation, the radar antenna comprising sum, difference and auxiliary channels, said method comprising: transforming the received signal in sum, difference and auxiliary channels, from the time domain into the frequency domain using a Fast Fourier Transformation; suppressing the jammer signal by means of side lobe cancellation, in the frequency domain; wherein the Fast Fourier Transformation takes place in a burst comprising N scanning values with N=2 Land L &egr; |N, the burst being divided into l sub-bursts with l=2mand m &egr; (0,1,2,3,4) of the length P.6. The method according to claim 5, wherein, to suppress the side lobe jammer by means of side lobe cancellation in the individual sub-bursts i with i=1 . . . l, the computation Y nS(i)=Sn(i)−Ks(i)*Gn(i) for the sum channel (S) and Y nD(i)=Dn(i)−Kd(i)*Gn(i) for the difference channel (D) takes place, with S n(i), Dn(i), Gn(i): Scanning values of the sum, difference and auxiliary channels in the frequency range for the sub-burst i, n=0, 1, 2, . . . N−1, K s(i), Kd(i) being scaling factors for the sub-burst i+1.7. The method according to claim 6, wherein: in a sub-burst i with i=1 . . . l−1, the corresponding scaling factors K s(i) and Kd(i) are determined; said scaling factors are used to eliminate the side lobe jammer in the chronologically next following sub-burst i+1 with i=1 . . . l−1; and the scaling factors for the sub-bursts i with i=1. . . l−1 are computed as follows: with i=1, . . . , l−1, M: clutter free signal range. 8. The method according to claim 7, wherein the scaling factors Ks(1) and Kd(1) of the first sub-burst i=1 are determined by: performing an initialization phase whose length P Iis shorter than P; and in the initialization phase, computing the scaling factors K s(1) and Kd(1) according to:9. A method of suppressing jammer signals in a received signal of a radar antenna in an HPRF application, by means of Fast Fourier Transformation and side lobe cancellation, the radar antenna comprising sum, difference and auxiliary channels, said method comprising: transforming the received signal in sum, difference and auxiliary channels, from the time domain into the frequency domain using a Fast Fourier Transformation; suppressing the jammer signal by means of side lobe cancellation, in the frequency domain; wherein the individual data Y nS(i) and YnD(i) of the sum and difference channels are combined to a final value YnSand YnDof the sum and difference channels for the corresponding burst.
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