A thick-screen frequency selective surface （FSS） has not only a broad bandwidth but also the advantages of overcoming the multilayer FSS shortcoming of complex structure and low transmittance of centre frequency due...A thick-screen frequency selective surface （FSS） has not only a broad bandwidth but also the advantages of overcoming the multilayer FSS shortcoming of complex structure and low transmittance of centre frequency due to the cascade of FSSs, and this means it could potentially be applied in a stealth curved streamlined radome. However, there is an unsteadiness of centre frequency in a wide range of incident angles and another unsteadiness of polarization in a big incident angle. In order to solve these problems, in this paper we provide a novel four-legged loaded element thick-screen FSS. The structure is analysed and simulated using the mode matching method and moment method. The centre frequency, the transmittance of centre frequency, and bandwidth of the structure are investigated when some parameters including the polarization at a big incident angle and the incident angles of TE ＆： TM waves are changed. The novel four-legged loaded element thick-screen FSS has better transmission properties with a better steadiness of polarization and incident angle independence. The novel structure of the four-legged loaded element thick-screen FSS provides a valuable reference for their application in a stealth curved streamlined radome.展开更多
由于光学特性的要求,直显式次毫米发光二极管(LED)对印制板表面的阻焊层平整度和色差要求非常严格,控制阻焊油墨厚度均匀性成为制作Mini LED PCB板的关键控制点之一。为满足这一要求,分析不同阻焊层制作原理,通过实验对比不同的阻焊层...由于光学特性的要求,直显式次毫米发光二极管(LED)对印制板表面的阻焊层平整度和色差要求非常严格,控制阻焊油墨厚度均匀性成为制作Mini LED PCB板的关键控制点之一。为满足这一要求,分析不同阻焊层制作原理,通过实验对比不同的阻焊层制作方式以及设备品牌及板件铜厚对板件油墨厚度极差的影响。结果表明,随着成品铜厚的增加,油墨厚度极差增大;对于阻焊层厚度均匀性要求高的产品,相较于传统方式,采用垂直2次分别喷涂+烘烤的方式更优。展开更多
文摘A thick-screen frequency selective surface （FSS） has not only a broad bandwidth but also the advantages of overcoming the multilayer FSS shortcoming of complex structure and low transmittance of centre frequency due to the cascade of FSSs, and this means it could potentially be applied in a stealth curved streamlined radome. However, there is an unsteadiness of centre frequency in a wide range of incident angles and another unsteadiness of polarization in a big incident angle. In order to solve these problems, in this paper we provide a novel four-legged loaded element thick-screen FSS. The structure is analysed and simulated using the mode matching method and moment method. The centre frequency, the transmittance of centre frequency, and bandwidth of the structure are investigated when some parameters including the polarization at a big incident angle and the incident angles of TE ＆： TM waves are changed. The novel four-legged loaded element thick-screen FSS has better transmission properties with a better steadiness of polarization and incident angle independence. The novel structure of the four-legged loaded element thick-screen FSS provides a valuable reference for their application in a stealth curved streamlined radome.
文摘由于光学特性的要求,直显式次毫米发光二极管(LED)对印制板表面的阻焊层平整度和色差要求非常严格,控制阻焊油墨厚度均匀性成为制作Mini LED PCB板的关键控制点之一。为满足这一要求,分析不同阻焊层制作原理,通过实验对比不同的阻焊层制作方式以及设备品牌及板件铜厚对板件油墨厚度极差的影响。结果表明,随着成品铜厚的增加,油墨厚度极差增大;对于阻焊层厚度均匀性要求高的产品,相较于传统方式,采用垂直2次分别喷涂+烘烤的方式更优。
