What is semi directional antenna?

Semi-directional antennas are designed to direct the RF signal in a specific direction for point-to-point communication. Semi-directional antennas are used for short to medium distance communication indoors or outdoors.

What are flat panel antennas?

A flat panel antenna is a kind of directional antenna, which means it only sends and receives radio signals from one direction. It has a broader beam, allowing the signal to reach a larger area.

Where directional antennas are useful?

Cellular repeaters often make use of external directional antennas to give a far greater signal than can be obtained on a standard cell phone. Satellite television receivers usually use parabolic antennas. For long and medium wavelength frequencies, tower arrays are used in most cases as directional antennas.

How do Yagi antennas work?

Yagi antennas use mutual coupling between standing-wave current elements to produce a traveling-wave unidirectional pattern. It consists of an array of a dipole and additional closely coupled parasitic elements. The elements in the Yagi antenna are usually welded to a conducting rod or tube at their centers.

Which are the two basic types of antennas briefly explain?

A Dipole Antenna is made up two conductors in the same axis and the length of the wire need to be small compared to the wavelength. A Loop antenna is formed by a single or multiple turn of wire forming a loop.

How does a parabolic dish antenna work?

A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves to the receiver in its focal point. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish.

Do directional antennas need line of sight?

No. Line of sight (LOS) is always desirable but not a critical requirement to establishing good performance. Using a fixed outdoor Poynting antenna improves performance and reliability for 3G/4G LTE even though line of site is not available.