Microwave field detector. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, detectors, metal detectors
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I have made a large number of microwave field detectors of various designs, and after an article in "RL" No. 11/92, I decided to share my experience in this area.
First, there are two unfortunate inaccuracies in the mentioned article. The first one is the R24 rating - 820 Ohm, the second one - nowhere in the text is it indicated that the VD1 cathode is connected by the screen of the insulated cable to the "ground" directly near VT1 (to reduce interference on the "ground" bus).
The microwave head is difficult to repeat at home, since turning and milling operations are required, so it is better to make a horn antenna (Fig. 1). It is simpler and does not need scarce fluoroplast. The waveguide and horn can be made of thin copper or tin plate. You can also use foil fiberglass, after polishing the foil and coating it with alcohol-rosin flux (so that it does not oxidize).
(click to enlarge)
A board with parts is attached directly under the antenna. There are a lot of processing schemes, but I recommend the one shown in Fig. 2, which does not require adjustments and does not have adjustment elements.
(click to enlarge)
In conclusion, I want to warn about the need for careful handling of microwave diodes. They are afraid of electrostatic electricity and during a breakdown, the sensitivity in the microwave field drops by an order of magnitude or more. The insidiousness of the situation is that when checked by a tester, a diode pierced by electrostatics behaves in exactly the same way as a serviceable one. Therefore, when working with microwave diodes, the same precautions must be observed as when working with MOSFETs.
Author: Yu.Igntatenko, Donetsk region, Enakievo; Publication: N. Bolshakov, rf.atnn.ru
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