Safe payment - We provide popular & safe payment methods, 24/7 Help Center and Buyer Protection policy to give you a smooth and secure shopping experience.Īliexpress is the brand leads you to savings on all your purchases in Toys & Hobbies, such as Arkbird High Gain 5.8G 5.8GHZ Double Biquad Antenna for Long Range FPV/ WiFi Antenna -12DB (RP-SMA) For transmitter and receiver. Worldwide shipping - We ship to over 200 countries ad regions, and our app support 12 languages and multiple currencies. Great Value - We provide competitve prices on over 100 millions quality items in Toys & Hobbies & more. 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.Buy Arkbird High Gain 5.8G 5.8GHZ Double Biquad Antenna for Long Range FPV/ WiFi Antenna -12DB (RP-SMA) For transmitter and receiver on AliExpress AliExpress is the go-to online shopping app to find everything you need at your fingertips! It's a place where fun and deals take over. 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 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. 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. You want an infinitely sized, perfectly conducting ground plane. 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).
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