How do you calculate the number of turns in a helical antenna?
Where S is the Spacing between helix turns, N number of turns, C is the speed of light and λ is the antenna wavelength. The antenna Gain = 32.08dB Pitch angle �� = 15.9° Height of antenna is known by formula H = N× ��, 2.2. 5 Where H = height of the antenna. N = number of turns, S = spacing between two turns.
What are the parameters to be considered for the design of a helical antenna?
The antenna geometry is described with the following parameters: circumference of helix C = πD , spacing p between the successive turns, diameter of helix D = 2a , pitch angle ψ = tan-1( p / πD ), number of turns N , total length of the antenna L = Np , total length of the wire L n = NL 0 where L 0 is the wire length …
What is a helical antenna?
The helical antenna when in axial mode is incredibly wide band which makes it great to receive our wide band analog signals as well as making it great for construction because building tolerances are incredibly loose. Thus, if you want an easy to construct antenna that will keep signal in a bank, this is the one for you.
What is the maximum efficiency of a helical antenna?
Maximum efficiency is about 80% with a 3-4 turn helical and drops to about 60% at 12 turns. The helical antenna when in axial mode is incredibly wide band which makes it great to receive our wide band analog signals as well as making it great for construction because building tolerances are incredibly loose.
How do I Make my helix match the polarization of antenna?
If you are flying with a circularly polarized antenna on your plane, then you need to make your helix match the same polarization. The polarization of the helix is simple. If the thread is the same as a bolt it is RHCP (Right Hand).
How do you make a helix winding?
You simply make a metal strip that is tapered so that the width is equal to the height over the reflector and follow the normal helix winding. Use this as the first 1/4 turn of your helix making it follow the natural helix winding spacing. The shape keeps the signal from being attenuated and also allows for some manufacturing error.