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It is very likely that the antenna is more efficient at the higher frequency. Another possibility is that the harmonic is being radiated from the wiring on your circuit board. Try putting a resistive load on the antenna connector and measure the two radiated components.
Are you sure that your array elements are really efficient collectors over that frequency range? The other problem you will have is that at frequencies where they are significantly less than a wavelength apart, you will not have any gain. At frequencies where they are over a wavelength apart...
It may be like spice where there has to be DC paths from all nodes to ground.
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It may be like spice where there has to be DC paths from all nodes to ground.
Another problem is the layout. The output can couple to the input if they are close together and there could be a common impedance in what you think is a 0 +j0 ohm ground.
In general, high fields that cause problems are from transmitters in the above 5 W radiated area. In your case the wiring will not be a good antenna and the radiated energy will be in the below 1 W region.
This has to do with highly directional antennas. It means to measure the radiation pattern and determine if its peak is where you would expect from the mechanical configuration of the antenna. The pointing of the antenna is commonly done using the mechanical configuration.
The LO power is independent of which output mixing product you use. It is set by the technology of the mixer circuit. In general, diode ring mixers require more LO power than active mixers.
The active multiplier will produce mostly the signal you want. The diode produces numerous harmonically related signals that you will have to filter out.
You are stuck with the limitations of the internal circuitry and the reflections from buildings. GPS uses satellites at all angles in the sky. Narrowing the antenna pattern will reduce the number of satellites you use and degrade the accuracy. As a matter of history, GPS was invented for use by...
Cables and connectors are so linear that they do not produce any significant distortion. Especially compared to the distortion produced by active circuits.
The standard solution is to use a transformer. They come just for this application with screw terminals for the antenna side and coax terminal for the receiver side.
Your biggest problem will be legal. Such things are prohibited by the radio laws of most countries. These laws restrict the peak power on the ISM bands which will reduce your range.
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