Mishka

I'm going to use a pair of cheap offset satellite mirrors of about 80 cm diameter. Looks like most of them were designed with F/D ≈ 0.5, hence the feed antenna should fit vast majority of its radiation into 90 degrees beam. I don't expect the mirrors will be of high quality, but I believe they're big enough to compensate some errors. Also, I'll try to align focal points. The link budget with monopole omnidirectional antennas (I assume 0dBi) and +8dBm PA on transmitter side is 104 dB which results in about 1600 m of theoretical range. I hope to break this 2 km barrier with directional antennas first (supposed to be +10 dBi each) which hopefully results in 5+ km range. And then with the satellite dishes (hope to achieve +25 dBi per node) to reach 10 km. Unfortunately, this is the maximum distance in my area where I may have more or less clear Fresnel zone. There is also 20 km line of sight, but there is a hill between the points.

Pretty much agree, thanks for the point. This will probably to decrease it by 1 dBi or such. So I could laser cut it from a copper plate instead. But this means that a different model needed. Also, I think that I'm going to fix the biquad to the reflector with two plastic struts, and for the feed line I'll use an SMA bulkhead extension cable from Amazon, like this one https://www.amazon.com/Bingfu-Bulkhead-Cellular-Amplifier-Transmitter/dp/B07MJQWH8S On the board side there is the U.FL connector.

Hello, first of all, please let me thank you for sharing the designs! This is absolutely stunning what you guys are doing here. I'm working with Bluetooth 5 enabled microcontrollers, and for an experiment want to build a long range symmetrical setup using vanilla nRF52840 MCU (+8dBm max). To break 2 km range, I'm thinking about a couple of offset dishes 1m diameter (expect to reach +25dBi), and looking for a suitable feed horn. I have noticed your biquad and batwing antenna designs. Both do promise about +10dBi gain, with the biquad a little bit narrower and hence with better directivity. I ilke that they can be manufactured on FR4 which means high reproducibility and hence low error margin. Also, I'm going to further tune the antenna with matching network to better match my source. However, I've noticed that the DXF / Gerber files (cited above) are not fully correspond to the dimensions on the CST screenshots listed for a very similar 2.44 GHz design - DXF / Gerber is bigger. Could you point me to the most decent model for 2.442 GHz, please? Also, may be there a better option to take the feed horn role? Thanks!