A wide‐angle frequency scanning narrow‐wall slotted waveguide array antenna with monopulse function is designed for two‐dimensional electrical scanning radar and communication systems. A novel slow wave waveguide formed by loading the periodic metal T‐shaped sheets onto the narrow wall is used to enhance the frequency scanning angular sector of the edge‐slotted waveguide traveling wave array. Two slotted waveguides with 35 radiation slots are arranged in a segmented frequency scanning structure to simultaneously achieve sum/difference patterns in the E‐plan. The prototype antenna fabricated and welded by aluminum is composed of 70 × 8 radiation slots with an overall size of 425 mm × 45 mm × 10 mm. The measured results show that the designed array exhibits a frequency scanning angle range of 20.6° at a relative operating bandwidth of 10% with greater than 50% aperture efficiency. The measured sidelobe level of sum beam is less than −17 dB, and null depth of difference beam pattern is below –25 dB over operating frequency band. This structure can be used to design the electrical two‐dimensional scanning array with a scanning sector greater than 20° × 80°.

中文翻译：

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具有增强扫描范围的新型频率扫描单脉冲缝隙波导阵列

具有单脉冲功能的广角频率扫描窄壁缝隙波导阵列天线是为二维电子扫描雷达和通信系统设计的。通过将周期性的金属T形片加载到窄壁上而形成的新型慢波波导用于增强边缘缝隙波导行波阵列的频率扫描角扇区。两个具有35个辐射缝隙的缝隙波导以分段频率扫描结构排列，以同时实现E平面中的和/差模式。用铝制造和焊接的原型天线由70×8个辐射槽组成，总尺寸为425 mm×45 mm×10 mm。测量结果表明，所设计的阵列的频率扫描角度范围为20。6％的相对工作带宽为10％，光圈效率大于50％。在整个工作频带上，测得的总和波束的旁瓣电平小于-17 dB，差值波束方向图的零点深度小于–25 dB。该结构可用于设计扫描扇区大于20°×80°的二维电子扫描阵列。