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I have a situation where I need to find receiving antenna impedance when it’s $\lambda/2$ distance from the transmitting antenna. Both are dipole antennas. Is it possible with EZNEC?

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  • $\begingroup$ Are you worried about the interaction between the conductors of the receiving antenna and the transmitting antenna that is $\lambda/2$ distance? I certainly wouldn't. Usually, the receiving antenna impedance is not as critical as transmitting since a mismatch in transmitting affects power out and also potential harm to the transmitter or at least limiting power out by transmitter protection circuits. Most receivers have "antenna trimmer" capacitors to improve the match with the antenna. $\endgroup$ – K7PEH Oct 18 '15 at 23:51
  • $\begingroup$ I want to find both 1. Impedance change in the transmitter 2. Impedance of the receiver so that I can design a matching circuit between receiving antenna and rectifier. $\endgroup$ – Shiva Mudide Oct 19 '15 at 14:10
  • $\begingroup$ OK, what you just said makes no sense to me. Maybe you are attempting to do something totally different than things common to ham radio. Maybe you can describe the goal of your question. $\endgroup$ – K7PEH Oct 19 '15 at 15:03
  • $\begingroup$ May be this might helps you. I want to find both 1. Impedance change in the transmitter when a receiving antenna is $lambda/2$ distance away from transmitter 2. Impedance of the receiver so that I can design a matching circuit between receiving antenna and rectifier $\endgroup$ – Shiva Mudide Oct 19 '15 at 15:28
  • $\begingroup$ That is the same thing you said above. Questions: (1) do you mean transmitter or transmitting antenna. What is the purpose of the rectifier and where is it located? Or, are you using the correct word? When I ask what you are trying to do, I didn't mean the the details above of your question. I meant why do you even care to know this stuff? Are you planning to actively receive on one antenna while transmitting on the other? Or, are you merely concerned about impedance change due to nearby conductor? And, for a nearby conductor's impact on impedance it does not matter what you use it for $\endgroup$ – K7PEH Oct 19 '15 at 16:08
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I believe that what you want is the effect of mutual coupling of the antennas. That, I believe, can be done in EZNEC by modeling both antennas at the same time (for example the transmitting antenna in the normal way and the receive antenna as a parasitic element not connected to anything).

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