共查询到18条相似文献,搜索用时 69 毫秒
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为了提高24 GHz物位雷达系统的精度和抗干扰能力,设计并制作了一款高增益、低副瓣、易集成的微带阵列天线。为了抑制天线的副瓣电平,该天线各阵元间的电流采用同相不等幅分布设计;同时,采用两种不同馈线的单元和串并联混合馈电网络,降低了馈电网络的设计难度。实测结果表明,该阵列天线的带宽为690 MHz(23.77~24.46 GHz),最大增益达到20.1 dBi,E面和H面的副瓣电平分别为-20.7 dB和-19.3 dB。该阵列天线结构紧凑、可靠性高,可用于24 GHz物位雷达系统。 相似文献
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为展宽微带天线的轴比带宽并提高增益,利用旋转馈电方法设计出一种小型化宽轴比高增益的圆极化微带阵列天线。天线由四个微带贴片单元和一个旋转馈电网络组成,每个贴片单元为引入半圆槽的切角矩形,且关于中心旋转对称;旋转馈电网络位于底层介质基板的表面,与四个贴片单元通过四个镀铜通孔相连。利用电磁仿真软件HFSS对天线的性能进行数值计算,阵列天线的-10 dB阻抗带宽为12.3%(4.71~5.33 GHz),3 dB轴比带宽为13.2%(4.67~5.33 GHz),峰值增益在5.2 GHz为9.02 dB。 相似文献
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主要阐述了一个新颖的X波段4×4单元微带阵列天线的设计方法。阵列天线辐射单元采用空气介质的微带贴片天线,辐射效率高;阵列天线的馈线网络采用低损耗的空气带状线形式,降低了馈线损耗。详细给出了微带贴片天线设计公式和阵列天线阵间距的选择。阵列天线性能优良,已成功地应用到某X波段光电雷达项目中。 相似文献
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设计了一种工作在C波段的宽带微带单脉冲阵列天线,采用口径耦合馈电和附加寄生贴片方式拓展微带天线带宽,利用三分支定向耦合器结构设计宽带微带和差网络,并与4×4微带阵列天线组成宽带单脉冲阵列天线,设计仿真后加工实物,经过实测,天线工作带宽1.2 GHz。 相似文献
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根据矩形贴片的腔膜理论,以 Rogers(5880)作为介质基板材料,设计了中心频点在24 GHz的贴片结构,用数值仿真方法进行了研究;按照阻抗匹配和天线增益要求,借助Matlab和ADS软件,设计了功分网络;最后采用HFSS软件对6×14微带阵列天线进行了系统仿真,计算了该天线阵的增益、带宽、电压驻波比、方向图等参数,并在中物院5所微波暗室平台进行测试,各参数都达到要求。 相似文献
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提出了一款高增益低副瓣新型圆极化微带天线阵。单元天线采用叠层切角圆极化微带结构,通过八边形边界布局和顺序旋转交叠组阵技术,实现了天线阵方向性图的对称性和圆极化辐射性能的最优化;馈电网络采用威尔金森功分器和最大平坦式阻抗变换器实现不等功分宽带阻抗匹配,通过改进馈电方向寻求对称结构,简化了馈电网络的设计。制作了天线阵实物并进行了测量。测试结果表明:天线在3.2~4.6 GHz频段内S11<-10 dB,阻抗相对带宽36%;在3.8~4.5 GHz频段内顶点轴比小于3 dB,圆极化相对带宽17%;在4~4.4 GHz频段内天线增益均在15 dB以上,最高增益达17 dB。 相似文献
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Shyh-Jong Chung Kai Chang 《Antennas and Propagation, IEEE Transactions on》1998,46(12):1802-1809
A Van Atta retrodirective reflector was designed and developed, using an aperture-coupled microstrip antenna array. This reflector possesses the advantage of reflecting high fields to the source point over a wide range of incidence angles and, owing to the low cost and conformability of the structure, is suitable for applications in intelligent vehicle highway systems (IVHS). An approximate theory associated with the reradiation and scattering principles of the reflector is presented for the purpose of understanding and designing the reflector. The utility of the retrodirective reflector was demonstrated by comparison with a plate reflector and a microstrip antenna array without a feed structure. Finally, a reflector with switches in the middle of the microstrip feed lines was investigated for possible applications in communications and remote identification 相似文献
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Novel double-layer microstrip array antennas are introduced for high-gain applications. In the proposed antennas, the complex and lossy feed network is not needed. Rather the double structure provides the field distribution at the aperture for the beam-focusing effect. A relatively simple design method based on a cavity model is presented 相似文献
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An array of microstrip antenna panels was designed for use on a small instrumented satellite as part of a 400-MHz telemetry link between that satellite and NASA's shuttle spacecraft. A roughly omnidirectionalphi -plane pattern was desired. The 1.4-wavelength diameter of the satellite and the various ports and structures on its surface presented strong constraints on the antenna array design. Eight antennas, each one a quarter-wavelength panel with one radiating and one shorted edge, were chosen. Aphi -plane pattern ripple of 4.4 dB and a gain of at least 0.1 dB relative to a half-wavelength dipole were realized. The design technique used for the individual antenna panels included the study of feed-point location for impedance matching and the effect of losses in the dielectric. A superposition method was used to synthesize the radiation patterns for different numbers and different excitations of antennas on the satellite. 相似文献
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