This paper presents a simple method of forming sum and difference patterns with adaptivenulls. The effects on the sidelobe level and the pointing null of difference pattern by adaptive null areanalyzed. The result tha...This paper presents a simple method of forming sum and difference patterns with adaptivenulls. The effects on the sidelobe level and the pointing null of difference pattern by adaptive null areanalyzed. The result that the increment value of the envelope of the sidelobe level under the effect ofa null is less than l.6dB is proved. The formula about shift value of the pointing null which is thefunction of the jammer direction and array parameters is given in the paper.展开更多
An array of two substrate-integrated waveguide(SIW)periodic leaky-wave antennas(LWAs)with sum and difference beam scanning is proposed for application in target detection and tracking.The array is composed of two peri...An array of two substrate-integrated waveguide(SIW)periodic leaky-wave antennas(LWAs)with sum and difference beam scanning is proposed for application in target detection and tracking.The array is composed of two periodic LWAs with different periods,in which each LWA generates a narrow beam through the n=-1 space harmonic.Due to the two different periods for the two LWAs,two beams with two different directions can be realized,which can be combined into a sum beam when the array is fed in phase or into a difference beam when the array is fed 180?out of phase.The array integrated with 180?hybrid is designed,fabricated,and measured.Measurement results show that the sum beam can reach a gain up to 15.9 dBi and scan from-33.4?to 20.8?.In the scanning range,the direction of the null in the difference beam is consistent with the direction of the sum beam,with the lowest null depth of-40.8 dB.With the excellent performance,the antenna provides an alternative solution with low complexity and low cost for target detection and tracking.展开更多
文摘This paper presents a simple method of forming sum and difference patterns with adaptivenulls. The effects on the sidelobe level and the pointing null of difference pattern by adaptive null areanalyzed. The result that the increment value of the envelope of the sidelobe level under the effect ofa null is less than l.6dB is proved. The formula about shift value of the pointing null which is thefunction of the jammer direction and array parameters is given in the paper.
基金Project supported in part by the National Natural Science Foundation of China(No.62171480)in part by the Guangdong Basic and Applied Basic Research Foundation,China(No.2020B1515020053)。
文摘An array of two substrate-integrated waveguide(SIW)periodic leaky-wave antennas(LWAs)with sum and difference beam scanning is proposed for application in target detection and tracking.The array is composed of two periodic LWAs with different periods,in which each LWA generates a narrow beam through the n=-1 space harmonic.Due to the two different periods for the two LWAs,two beams with two different directions can be realized,which can be combined into a sum beam when the array is fed in phase or into a difference beam when the array is fed 180?out of phase.The array integrated with 180?hybrid is designed,fabricated,and measured.Measurement results show that the sum beam can reach a gain up to 15.9 dBi and scan from-33.4?to 20.8?.In the scanning range,the direction of the null in the difference beam is consistent with the direction of the sum beam,with the lowest null depth of-40.8 dB.With the excellent performance,the antenna provides an alternative solution with low complexity and low cost for target detection and tracking.
