Double bi-quad antenna dimension calculator

On-line antenna designer. Calculate the required dimensions for a double bi-quad antenna construction for any given frequency. A directional antenna ideally suited for UHF and above frequencies for use with WiFi, UMTS, LORA, mobile phone networks and more.

Enter the required frequency in MHz and the antenna designer will calculate the dimensions of the elements as shown below.

Note: After receiving several questions about the rear reflector for this antenna, the following:

• The diagram shown is not to scale.
• The minimum reflector measurement should be a quarter of a wavelength larger on each side of the antenna than the dimensions of the active antenna element itself. (half wave longer is a bit better, but more has no effect)
• Purpose of the reflector is to block rf signals from the rear while allowing bounced rf of the reflector to reach the antenna in phase with the directly received rf on the antenna itself. Making it a forward facing unidirectional antenna with a bit of gain.
• The reflector does not need to be made of a solid metallic material, a great wind catcher outdoors. It can be made with wire mesh, the distance between the mesh should be smaller than a quarter wavelength and not a multiple division of the required frequency wavelength.
• If you want a bi-directional antenna, receiving from both front and back, the reflector can be ignored and removed completely.