Is helical antenna wideband?

The strip helical antenna is designed for wideband applications that provide a wide bandwidth and circular polarization. A wideband bandwidth of 1.37GHz with a resonant frequency at 10 GHz is achieved by the helical antenna on the Paper substrate.

Is helical antenna a broadband antenna?

Helical antenna is an example of wire antenna and itself forms the shape of a helix. This is a broadband VHF and UHF antenna.

What is the gain of helical antenna?

The gain of one optimal nonuniform helical antenna can be about 2.5 dB higher than the gain of a uniform helical antenna of the same axial length. Creating a array further increases the gain up to about 6 dB.

What is a helical antenna used for?

Helical broadcasting antennas Specialized normal-mode helical antennas are used as transmitting antennas for FM radio and television broadcasting stations on the VHF and UHF bands.

What is axial ratio in helical antenna?

The axial ratio of the antenna using equation 3.37 was calculated to be 1.07 which is in line with theory that the axial ratio of a helical antenna was a unity. In increasing the inductor, L, and capacitors used for constructing the frequency multiplier circuit was in line with the choice of values.

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 …

Why a helical antenna is used for satellite tracking?

A helical antenna is used for satellite tracking because of its. circular polarization.

What is the pitch angle of the helical antenna to become a loop antenna?

What is the pitch angle of the helical antenna to become a loop antenna? Explanation: C is the circumference and L is the length, s is the spacing between turns. When pitch angle α=0, the separation becomes zero and length will be equal to circumference of the loop. Hence it acts as a loop antenna.

What is axial ratio bandwidth?

The axial ratio is the ratio of orthogonal components of an E-field. A circularly polarized field is made up of two orthogonal E-field components of equal amplitude (and 90 degrees out of phase). This indicates that the deviation from circular polarization is less than 3 dB over the specified angular range.

What are helical antennas?

The most popular helical antenna (helix) is a travelling wave antenna in the shape of a corkscrew that produces radiation along the axis of the helix antenna. These helix antennas are referred to as axial-mode helical antennas.

What are the limiting conditions of a helical antenna?

Therefore, patch angle at 0° and 90° serves as the limiting conditions of the helical antenna. So, we can say, if the spacing tends to zero but the diameter is constant then helix resembles like a loop.

What is the formula for a helix antenna?

H – Total height of helix antenna, H = NS . The antenna in Figure 1 is a left handed helix antenna, because if you curl your fingers on your left hand around the helix your thumb would point up (also, the waves emitted from this helix antenna are Left Hand Circularly Polarized).

What happens if the helix antenna is wound the other way?

If the helix antenna was wound the other way, it would be a right handed helical antenna. The radiation pattern will be maximum in the +z direction (along the helical axis in Figure 1). The design of helical antennas is primarily based on empirical results, and the fundamental equations will be presented here.