The size of the reflector is also critical.
In the case of a corner reflector, the distance from the real antenna element and the reflector is critical. Changing these sizes will change the antenna's "pattern" of radiation. The spacing and size of all the other elements of the antenna have to be exact - to operate optimally. The rest of the antenna interacts with that "hot" element through the air (called "passive" elements). Part 3: In designing antennas, usually only one piece of metal is actually fed with the power from the transmitter. or 1:1.Designers optimize an antenna's design for "resonance" and signal "pattern" (as well as it's beamwidth) If the antenna is not the right length, some of the power will be bounced back towards the transmitter and cause heat build-up. They have to be the correct length so that the RF wave reaches it's end - at the end of the antenna. Part 2: Because antennas are fed with RF energy of a certain frequency, the conducting elements of the antenna have to be "resonant". Most times, you Want a lower signal to the rear. This is called the "Front to back ratio" - and is also in DB. You don't get something for nothing! The signal is reduced to the rear. The more you concentrate the power in one direction, the narrower the signal's "Beamwidth" becomes.like focusing a flashlight or hose. You design them to make the pattern you desire. ALL antennas have a "pattern" that is not equal in all directions. This DBi gain is compared to an imaginary pin-head antenna that has a perfectly even radiation pattern - like a 360 degree sphere. It's more complex than that.Īntennas are rated in "DBi gain". And they don't just take the rear 180 degrees of radiated power - and face it forward. Antenna designs don't amplify the signal, they concentrate it.
As you might imagine, it reflects the radiated RF from the controllers antenna - towards a forward direction instead of 360. Part 1: The current reflector design is whats called a "Corner Reflector" or "Parabolic Reflector" antenna.
I'll offer easy to understand theory here too- so folks can grasp exactly what is going on - and use these reflectors to the best advantage. It's likely that the various basic designs of the ones out there are within 20% of a perfect design.
#DJI PHANTOM ANTENNA BOOSTER TEST FULL#
We can do a full analysis of the antenna's "gain" and "pattern". Thing is, I can tell from it's design that nobody has really put the calculator to optimizing it. The Windsurfer style antenna boosters were a great idea for the Phantom series. Signals / antennas / transmitters / receivers. I'm a new P3P owner and it's a rainy day. Hey guys- ( pre-apologize for the length of this- but it might be useful) the signal back from AC which hits parabola is reflected TO the antenna. Most time - you won't see benefit - but usually its there in signal strength. but they create a 'beam' with a shallow angle - making a 'beam' that allows AC to be off that parallel centre line and still benefit. Measuring these reflectors - the ones I have are not true parallel beam reflectors. Even if it is not parallel forward as a true parabolic reflector is supposed to - it will still push that signal forward and if you are not dead straight to AC antenna - will help.
but with a parabola - the signal that was basically wasted is now reflected forward. Think about it - with stock antenna - you have signal being promulgated 360deg. Even a parabola that is not 'focused' precisely is better than none. Generally I don't use my dual parabola - but occasionally I look at the location and feel helping signal could be better. Now its about quality and strength of signal. For me - its not about range - I got that out of my system when I modd'd my P3S and was getting over 5km range.
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