Helical Antenna

December 21, 2023 Post a Comment

Helical antenna

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

What are the advantages of helical antenna?

Benefits or advantages of Helical Antenna ➨It can be used for broadband applications due to wider bandwidth. ➨It can be used at HF/VHF frequencies for transmission and reception. ➨It offers higher directivity. ➨It is very robust in construction.

Is a helical antenna directional?

The HELICAL antenna is a passive circular polarized directional wide-band UHF antenna which can be used as a transmitting or receiving antenna for wireless microphones and in-ear monitoring systems.

What are the features of helical antenna?

A helix is a fundamental form of antenna with many radiation modes. A recently reported mode, called an axial or beam mode, occurs for a relatively wide range of helix dimensions, in the region of 0.2 to 0.5 wave-lengths diameter and as high as 0.5 wave-lengths spacing between turns.

What are the three types of antennas?

The three main types of antenna are directional, semi-directional, and omni-directional.

What is the wavelength of a helical antenna?

This helix antenna has a specification with 10 turns, wavelength of 30 mm, length of 310 mm, height of 70 mm, spacing of 7 mm, diameter of 9.55 mm, and a calculated strip width of 4.84 mm. Figure 2: Design structure of 10 GHz Helical Antenna using Paper material.

What is the efficiency of the helical antenna?

Since no antenna is perfect, the efficiency factor allows you to specify the degradation in performance. Typical values fall in the range of 70 to 90 percent. The center-to-center distance between the turns of the helix. The total number of turns of the helix.

What is helical pattern?

A helix (/ˈhiːlɪks/) is a shape like a corkscrew or spiral staircase. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis.

Why is helical antenna used for satellite tracking?

In addition to circular polarization, monofilar helical antennas offer the advantage of high gain in axial direction over a wide range of frequencies which makes them suitable for applications in broadband satellite communications.

What is pitch in helical antenna?

The helix antenna functions well for pitch angles ( ) between 12 and 14 degrees. Typically, the pitch angle is taken as 13 degrees. The normalized radiation pattern for the E-field components are given by: For circular polarization, the orthogonal components of the E-field must be 90 degrees out of phase.

How do you calculate gain of 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.

How do you make a helical antenna?

Helical Antenna Design.
Helix Design Specifications.
Model Assumptions and Differences.
Helix Design Parameters.
Frequency of Operation and Bandwidth.
Create Helical Antenna.
Pattern Behavior.
Discussion on the Results.

Which mode of radiation occurs in an helical antenna?

Explanation: In Axial mode of radiation, the radiation is in end-fire direction along the helical axis. In Axial mode of radiation, the dimensions of antenna are approximately equal to the wavelength and spacing space of λ/4.

What kind of polarization is provided by helical antenna?

Abstract: A helical coil radiates a wave of circular polarization in a doughnut pattern if the area and pitch of the turns are properly related to the radianlength of the wave.

What is Yagi Uda and helical antenna?

A Yagi-Uda antenna was seen on top of almost every house during the past decades. The parasitic elements and the dipole together form this Yagi-Uda antenna. The figure shows a Yagi-Uda antenna. It is seen that there are many directors placed to increase the directivity of the antenna. The feeder is the folded dipole.

What are the 4 types of antenna?

Different Types of Antennas

Short Dipole Antenna.
Dipole Antenna.
Loop Antenna.
Monopole Antenna.

Which are the two basic types of antennas?

There are several different types of antennas in three broad categories: omni-directional, directional, and semi-directional. – Omni-directional antennas propagate in all directions. – Semi-directional antennas propagate in a constricted fashion, defined by a specific angle.

What is the frequency of an antenna?

Antennas are commonly used to transmit and receive electromagnetic radiation in the frequency range from 3 kHz≲f≲3 THz.

What is helical wire?

Wire with a general cross-sectional shape that is non-circular and has an orientation that varies helically along the length of the wire. Used for threaded nails, spikes, concrete reinforcement, nonskid gratings, etc.

What do you mean by antenna array?

An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves.