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Harmonic Radar Finds Hidden Electronics

https://fed.brid.gy/r/https://hackaday.com/2026/02/12/harmonic-radar-finds-hidden-electronics/

<div><img alt="A diagram of a radar system is shown. A pair of antennas is shown on the left, with beams illuminating a number of electronic devices, labelled as "Concealed Targets."" class="attachment-large size-large wp-post-image" height="449" src="https://hackaday.com/wp-content/uploads/2026/02/harmonic_radar-e1770527229391.png?w=800" style="margin: 0 auto; margin-bottom: 15px;" width="800" /></div>
<p>For as long as small, hidden radio transmitters have existed, people have wanted a technology to detect them. One of the more effective ways to find hidden electronics is the nonlinear junction detector, which illuminates the area under investigation with high-frequency radio waves. Any P-N semiconductor junctions in the area will emit radio waves at harmonic frequencies of the original wave, due to their non-linear electronic response. If, however, you suspect that the electronics might be connected to a dangerous device, you’ll want a way to detect them from a distance. One solution is harmonic radar (also known as nonlinear radar), such as this <a href="https://ieeexplore.ieee.org/abstract/document/11006501" target="_blank">phased-array system</a>, which detects and localizes the harmonic response to a radio wave.<br /><br />One basic problem is that semiconductor devices are very rarely connected to antennas optimized for the transmission of whatever harmonic you’re looking for, so the amount of electromagnetic radiation they emit is extremely low. To generate

Harmonic Radar Finds Hidden Electronics https://hackaday.com/2026/02/12/harmonic-radar-finds-hidden-electronics/
#RadioHacks #Continuouswaveradar #Fmcwradar #Nljd #Nonlinearjunctiondetector #Radar

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