Huh, neat! Tips for adding a Yagi antenna to wifi routers and equipment.
It’s easy to make a small Yagi for a wireless router even if it lacks an antenna connector. The photo shows how I added two parasitic elements to the sleeve dipole of my Netgear WGR614.
With the AO 8.51 Antenna Optimizer I modeled a three-element Yagi at 2412, 2437, and 2462 MHz. These are center frequencies of the lowest, middle, and highest U.S. Wi-Fi channels. To model the sleeve dipole, I optimized the length of an isolated driven element for minimum SWR. Then I added the parasitics and optimized their lengths and positions for maximum forward gain, including mismatch loss for a 50Ω source impedance. All optimizations weighted the three frequencies equally. Finally, I rounded the dimensions. Below are calculated performance figures at the channel centers using 30 analysis segments per halfwave. Forward gain includes mismatch and conductor losses.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.