Wifi Antennas come in all shapes and sizes and these various shapes reflect the design purpose of the antennas. The main purpose of all antennas is to direct the radio signal energy from the transmitting and receiving antennas in and efficient way. A receiving antenna will gain most when the transmitter antenna focuses the maximum amount of avai...
Wifi Antennas come in all shapes and sizes and these various shapes reflect the design purpose of the antennas. The main purpose of all antennas is to direct the radio signal energy from the transmitting and receiving antennas in and efficient way. A receiving antenna will gain most when the transmitter antenna focuses the maximum amount of available signal energy in its direction.
Directional antennas like Yagi Antennas and Grid Antennas produce long focused cigar shaped signal footprints, ideal for point to point applications. Panel antennas can also be made to be highly directional. Omni-directional antennas are typically shaped like rods and produce a radiation pattern that is donut shaped provided a symmetric circular footprint perpendicular to the direction of the rod. These antennas are good for all round coverage applications. Some indoor antennas can have dome shapes but still produce the donut footprint. The antenna gain is an important measure of the antennas ability to propagate the available signal power in the desired direction.
The higher the gain the more reach the antenna has and the greater the signal strength received at a given point. Wifi Antennas are like any other antennas in that they have a design function. The general characteristic of all antennas is that they focus the energy delivered to them in patterns of radiated EM (electro magnetic) waves, which in everyday language we call radio waves. The physical characteristics of a given antenna are determined by the wavelength and corresponding frequency for which the antenna is designed.
In this section you can find Wifi Directional Antennas, Omnidirectional Antennas, Grid / Parabolic Antennas, Yagi Antennas and High Gain Antennas for indoors.
A directional antenna or beam antenna is an antenna which radiates greater power in one or more directions allowing for increased performance on transmit and receive and reduced interference from unwanted sources.
An antenna that produces a cigar shaped signal footprint would be useful for concentrating the signal energy in a point to point direction thereby propagating the signal further in the direction between the two points and less to the sides. This kind of antenna is called a directional antenna.
Here you will find a great variety of high gain directional USB Wifi Antennas
An omnidirectional antenna is an antenna which radiates radio wave power uniformly in all directions in one plane, with the radiated power decreasing with elevation angle above or below the plane, dropping to zero on the antenna's axis.
Omnidirectional antennas are most commonly are used to create hot spots by transmitting a signal over a large area in all directions or receiving signals in all directions when the transmit location is unknown or close by. Omni WiFi antennas do not need to be pointed since their radiation cone is 360 degrees, working in all directions.
Omnidirectional antennas are widely used for radio broadcasting antennas, and in mobile devices that use radio such as cell phones, FM radios, walkie-talkies, wireless computer networks, cordless phones, GPS ...
If you wanted to receive a signal all around the antenna, perhaps when you are sharing Wifi in a spread out community, you would want a more evenly spread out footprint. This type of antenna is called an omnidirectional antenna.
In this section we have high gain Wifi Omni Antennas for Indoors and Outdoors
Parabolic and or grid antennas are used as high-gain antennas for point-to-point communications, in applications such as microwave relay links that carry telephone and television signals between nearby cities, wireless WAN/LAN links for data communications, satellite communications and spacecraft communication antennas.
The reflector can be of sheet metal, metal screen, or wire grill construction.
A reflector made of a grill of parallel wires or bars oriented in one direction acts as a polarizing filter as well as a reflector.
The directive qualities of an antenna are measured by a dimensionless parameter called its gain.
Here you'll find high gain Wifi Antennas, type Grid / Parabolic Antennas
A Yagi antenna, is a directional antenna consisting of a driven element (typically a dipole or folded dipole) and additional parasitic elements (usually a so-called reflector and one or more directors).
Highly directional antennas such as the Yagi are commonly referred to as "beam antennas" due to their high gain.
The reflector element is slightly longer (typically 5% longer) than the driven dipole, whereas the so-called directors are a little shorter. This design achieves a very substantial increase in the antenna's directionality and gain compared to a simple dipole.
An Indoor antenna is a type antenna placed indoors, as opposed to being mounted on the roof.
Indoor antennas are usually a simple and cheap solution that may work well when the receiver is relatively near to the broadcasting transmitter and the building walls do not shield the radio waves too much.
An indoor antenna is prone to picking up more electrical noise that may interfere with a clear (analog) reception. Used for digital broadcast, the noise is less of a factor, which recently makes this type of antenna a more popular solution.
A sector antenna is a type of directional microwave antenna with a sector-shaped radiation pattern.
The word 'sector' is used in the geometric sense; some portion of the circumference of a circle measured in degrees of arc. 60°, 90° and 120° designs are typical, often with a few degrees 'extra' to ensure overlap and mounted in multiples when wider or full-circle coverage is required.
The antenna's long narrow form gives it a fan-shaped radiation pattern. Sector Antennas have usually a downtilt so that the base station can more effectively cover its immediate area and not cause RF interference to distant cells. The coverage area which is equal to the square of the sector's projection to the ground can be adjusted by changing the downtilt. Downtilting can be used to solve specific problems, for example local interference problems or cells that are too large.
To increase or widen the coverage area, and thus the number of served clients, several sector antennas are installed on the same supporting structure, e.g. tower or mast.
They are used for limited-range distances of around 4 to 5 km.
Read more about Sector Antennas here...
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