Millimeter wave radiometer receiver for target radiation characteristic measurement, and millimeter wave target radiation characteristic measuring method
A radiation characteristic and millimeter wave technology, which is applied in the field of precision measurement, can solve the problems of difficult debugging, poor flexibility, and large RF switch constraints, and achieve the effect of reducing video signal processing hardware circuit modules and reducing volume
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[0048] The antenna of the radiation characteristic measurement receiver in this embodiment is a Cassegrain antenna, with a diameter of 130mm, a working frequency of 32~36GHz, a main beam width of 3.9°, and a gain of 30dB; the working frequency of the electronically controlled attenuator is 32~36GHz, and its insertion The loss is 1.8dB, the attenuation coefficient is 35dB when the attenuation is maximum; the noise source super-noise ratio is 14dB, the coupling coefficient of the directional coupler is -13dB, and the insertion loss is 1dB; the working frequency of the isolator is 32~36GHz, and the insertion loss is 0.6dB , The isolation is 30dB; the center frequency of the local oscillator is 34GHz, the output power is 14dBm, and the frequency stability is 5MHz / ℃. The maximum insertion loss of the mixer is 7dB, the noise figure is 8dB, and the local oscillator RF port isolation is 20dB; the pre-IF amplifier is integrated in the mixer, and its working bandwidth is 100-2500MHz, and ...
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