How to Design and Build a 70cm DIY Loop Antenna (EP37)

Описание: This video is about building a loop antenna for the 70 centimeters amateur radio band. What I particularly like about this antenna is that it implements a bandpass and a powerful antenna at the same time. The principle of this antenna is actually very simple: A ring with the circumference of one wavelength is excited with its resonant frequency and thus acts as a filter and antenna at the same time. Since this type of loop antenna has a fairly high radiation impedance, a suitable matching network is needed for it, which is not easy to calculate. That's why we at “electronics.unmessed” have developed a dimensioning tool based on EXCEL: it allows you to design such an antenna for different materials and for an arbitrary frequency band.

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0:00 Teaser - Resonant Loop
0:23 Advantage of the Loop
1:10 Matching
2:00 Materials
2:45 Calculating the Layout
9:33 Antenna Assembled
10:30 Playing with Tolerances
11:40 Reflection Measurement
14:03 Insights & Next Steps


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