Antenna 2.4 GHz and 5 GHz

Contact MFT Systems for your Wireless (WiFi) Antenna needs.

Antenna

An antenna gives the wireless system three fundamental properties-gain, direction, and polarisation. Gain is a measure of increase in power. Direction is the shape of the transmission pattern. A good analogy for an antenna is the reflector in a flashlight. The reflector concentrates and intensifies the light beam in a particular direction similar to what a parabolic dish antenna would to a RF source in a radio system.

Antenna Gain

Antenna gain ratings are in decibels which is a ratio between two values. An antenna rating is typically to the gain of an isotropic or dipole antenna (dBi). An isotropic antenna is a theoretical antenna with a uniform three-dimensional radiation pattern (similar to a light bulb with no reflector). dBi is used to compare the power level of a given antenna to the theoretical isotropic antenna. An isotropic antenna is said to have a power rating of 0 dB; for example, zero gain/loss when compared to itself.

Types of Antenna

Omnidirectional Antenna

Omnidirectional antenna are designed to provide a 360-degree radiation pattern. This type of antenna is used when coverage in all directions from the antenna is required.

Directional Antenna

Directional antennas come in many different styles and shapes. An antenna does not offer any added power to the signal, it simply redirects the energy it receives from the transmitter. By redirecting this energy, it has the effect of providing more energy in one direction, and less energy in all other directions. As the gain of a directional antenna increases, the angle of radiation usually decreases, providing a greater coverage distance, but with a reduced coverage angle. Directional antennas include yagi antennas, patch antennas, and parabolic dishes. Parabolic dishes have a very narrow RF energy path and the installer must be accurate in aiming these at each other.

Diversity Antenna Systems

Diversity antenna systems are used to overcome a phenomenon known as multipath distortion of multipath fading. It uses two identical antennas, located a small distance apart, to provide coverage to the same physical area.

Multipath Distortion

Multipath interference occurs when an RF signal has more than one path between a receiver and a transmitter. This occurs in sites that have a large amount of metallic or other RF reflective surfaces. Just as light and sound bounce off of objects, so does RF. This means there can be more than one path that RF takes when going from a TX to and RX antenna. These multiple signals combine in the RX antenna and receiver to cause distortion of the signal. Multipath interference can cause the RF energy of an antenna to be very high, but the data would be unrecoverable. Choosing the correct type and location of the antenna can eliminate multipath interference.

Wireless Site Survey

Site Surveys, planning and design are becoming recognised as an essential process when proceeding with Wireless Networks within organisations. The survey will usually involve a site visit to run tests to determine the presence of RF interference to determine the optimum configuration and installation location of Wireless Access Points and also the type and position of Antenna. We also analyse building floor plans with your indicated covergae zones and requirements.

Contact MFT Systems

We are ready to help and provide you with a wireless solution.