Optimization and Measurement of a Smoothly Profiled Horn for a W-Band Gyro-TWA
Optimization and Measurement of a Smoothly Profiled Horn for a W-Band Gyro-TWA
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DOI：
10.1109/ted.2017.2687949
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发表时间：
2017-03
影响因子：
3.1
通讯作者：
Liang Zhang;Wenlong He;C. Donaldson;Graham M. Smith;D. Robertson;R. Hunter;A. Cross
中科院分区：
文献类型：
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作者：
Liang Zhang;Wenlong He;C. Donaldson;Graham M. Smith;D. Robertson;R. Hunter;A. Cross
为了改善W波段回旋行波管放大器的真空兼容性，设计并制造了一种光滑喇叭，以取代波纹喇叭。它被优化为高真空完整性，低反射，高基本高斯模式内容，低旁瓣电平，并在90-100 GHz的频率带宽的高方向性。在此工作频段上，反射率优于-37 dB，与基高斯模的耦合率高于97%。远场方向图在测量中显示出约27 dB的方向性，旁瓣低于−30 dB。
In this paper, a smoothly profiled horn was designed and manufactured to replace a corrugated output horn for a W-band gyrotron traveling-wave amplifier with improved ultrahigh vacuum compatibility. It was optimized for high vacuum integrity, low reflection, high fundamental Gaussian mode content, low sidelobe levels, and high directivity over the frequency bandwidth of 90–100 GHz. Over this operating frequency band the reflectivity was better than −37 dB and the coupling to a fundamental Gaussian mode was above 97%. The far-field pattern showed a directivity of approximately 27 dB in the measurement with sidelobes lower than −30 dB.