Biquad Wifi Antenna Calculator
The metal plane really just has the purpose of acting as a reflector – due to symmetry, the biquad has the same pattern into the 'front' and back, and adding a simple metal plane in the right distance from the antenna will make the reflections add up constructively with the 'forward' direction, thus adding a 3dB to gain (in theory). You want an infinitely sized, perfectly conducting ground plane. You don't get that, but something around two times the quad side length in each direction around the driven element should do most of the work – you don't lose that much if you don't have that. The bent 'legs' might have the purpose of electrically 'enlarging' the plane area, but they might also serve as mechanical improvements, making the ground plane more rigid.
Biquad Wifi Antenna Satellite Dish
I'd recommend simulating this stuff – OpenEMS, free as it is, already comes with a Biquad example, and you'd only need to add a reflector to that and play with the parameters. The problem I often encounter when researching this kind of question is that many Antenna 'theory' on the internet is written by Hams that assume that SWR (standing wave ratio) is the final and best and only measure for antenna quality, totally ignoring that an impedance-matched terminator has perfect SWR; so for example, I found one source that claimed that a driven element-plane distance that would lead to destructive interference is the optimal configuration – probably just because he saw a better impedance matching that way. But that's the dominant quality of antenna discussions – based on not-really-understood measures and vague heuristics rather than actual simulation and understanding:(. $ begingroup $ I don't know your equipment, but 50 Ω is the most common impedance in microwave equipment, yes. An antenna is technically but an impedance transformer between your transmission line and the free-space impedance, so matching an antenna design to your line is crucial.
Now, for transmit only, if you're not planning to use significant power and if your TX amplifier can withstand a bit of reflection, a perfect match isn't strictly necessary, but you'd waste power on energy being reflected back into the cable. $ endgroup $ – Dec 13 '16 at 11:53 •.
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These dimensions are taken directly from Andrew's PCB biquad yagi design. I used a short length of flexible coax cable with an SMA connector to connect the antenna to my USB WiFi adaptor. Have a look at the video that inspired this design here: Biquad Yagi 2 4GHz and 5 8GHz Upgrade! Double BiQuad sector antenna. Ask Question 1 $ begingroup $ I want to DIY a double BiQuad antenna. $ begingroup $ The font of the title reminds me of some famous antenna calculator collection website. What is the name of the tiny PCB radio connectors? Apple WiFi/Bluetooth antenna ports) 2.