宽频段雷达天线罩电厚度反射测试探头设计

在雷达天线罩电厚度反射测试中,针对测试探头与被测天线罩的失配反射限制测量范围,以及传统校准方法只适用于 特定单一工作频率的问题,采用波导魔 T 和半星形截面的介质柱相结合,设计了一种消除波导探头与天线罩外壁失配影响的贴 合式探头,优化提升了测试信号相位与天线罩插入相位变化的映射线性度,无需校准即可实现宽频段测量。 在 X 波段方波导 8~12 GHz 全频段范围内,探头对测试端口失配抑制可达 30 dB。 利用该探头,可以方便地将反射测试信号转化为传输信号,而 且仅通过简单的相位比对,即可获取天线罩电厚度信息,并可以直接实现不同工作频率下的测试。

Design of electric thickness reflex test probe for wideband radar radome

Aiming at the issues such as measurement ability limitation caused by the mismatch between the test probe and the radome under test, as well as the traditional calibration methods apply only for a particular single operating frequency, one kind of radome electrical thickness reflection test probe is proposed innovatively by use of magic-T and half-star cross section prism. By which, the mismatch suppression can be up to 30 dB within 8 ~ 12 GHz full frequency range of X band, and the linearity of the phase mapping between the test signal and insertion phase difference of radome is optimized, and with no calibration required. Using this probe, the reflection test signal can be easily converted into transmission signal, the thickness information of the radome can be obtained by simple phase comparison, and the probe can be used at different operating frequencies at same time.