DC resistance of DJ7GP-Feed

  • HI all,


    I have (maybe) a strupid question regarding the DJ7GP-Feed:


    I checked the DC resistance of the 2.4GHz Patch and the meter shows 1.1 Ohms. So now I wonder if the antenna works like a folded dipole which forms a closed loop?


    Thanks!


    73 Mic

  • Hallo Mic,


    a few minutes ago I sent the following mail to an OM who asked the same question:


    Your thoughts are correct!


    The radiator and the reflector disc have a mechanical and thus also an electrical connection. At 2.4 GHz, of course, it looks different. Just think of a loop dipole, where you also measure a short circuit at the (symmetrical) feed-in point. ...And it gets even worse! If the loop dipole is directly attached to the boom at its point of symmetry (which is indeed permissible), there is also a conductive connection to the boom. ... and still the structure works. That is the "exciting" thing about HF technology!


    I wish you much success and lots of fun with your activities over QO-100!


    73! Peter, DJ7GP


    PS .: If you have any questions, do not hesitate to contact me!