The Receive Antenna Type and Optional


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the antenna type and optional

2.1 full-directional antenna

Existing omnidirectional antenna shape is generally cylindrical, also known as half-wave dipole antenna (the dipole). The corresponding product at both indoor and outdoor, the size of the most important difference in gain. If there is considered from the perspective of increasing coverage, you can use the omni-directional antenna, because do not need to take into account the antenna placed, the angle of the supplied extension cable is very convenient for the average user, can be freely placed in any corner of the desktop. Outdoor omnidirectional antenna can provide a wide range of open areas covered with the antenna itself after rain and lightning and other treatment, can effectively work in a relatively harsh environment, usually for pole mounting. Parameter properties of contrast gain, VSWR, vertical beam width, lightning protection measures need to buy the omni-directional antenna.

2.1.1 The ordinary omni-directional antenna

General indoor use dipole antenna does not exceed 10 dBi, a common 5 ~ 8dBi, the radiation of the antenna gain is like a spherical or ellipsoidal, to meet the indoor corner and on lower cover, closer range; the full range of outdoor antenna is generally used for point-to-multipoint (PtMP) connection, because of its smaller vertical lobe, if the antenna set is relatively high, often at a distance of just below or close to areas not covered by the case, but its The overall coverage. Optional omni-directional antenna is required to distinguish between indoor and outdoor antenna and application.


The ordinary omni-directional antenna

 

2.1.2 Indoor Ceiling Antenna

Ceiling antenna is a special kind of omni-directional antenna. Consider to wiring restrictions, the ceiling antenna in the ceiling, the gain is generally 3-5 dBi, Home users, ceiling antenna is not very popular, because it involves the AP installation position. Common solution extension cable or use radio frequency to connect PoE Ceiling AP
Then the AP and the antenna. Another common situation is to use enhanced indoor cell phone signal coverage, the use of the frequency band between 800MHz-900MHz.

The vertical radiation pattern as shown above, ceiling antenna downward radiation, in order to ensure complete coverage of the area below. For the radiation of the antenna above the ceiling antenna will have a distinct weakening of signs, both to ensure the purpose of coverage, but also to prevent the leakage of wireless information and the effect of the protection of wireless security.

2.2 The directional antenna

Directional antenna, omni-directional antenna to use more targeted. Is normally used for coverage of a particular region, point to point connections, long-distance transmission. The appearance of gain of the directional antenna, the following are some common directional antenna.

2.2.1 The flat panel directional antenna (Patch Antenna)

The patch antenna is more directional antenna, its composition is relatively simple, generally square or rectangular shape, internal arrangement of the multiple-oscillator radiation in the same direction to increase the gain. The oscillator determines the number of antenna gain, usually 6-14dBi, high can reach more than 20dBi.
This type of antenna can either be used as cover, can also be used to point transmission, both in indoor and outdoor use. Appearance for the side plate, but the installation method different pole mounting, wall mounting, and some can also be placed on the desktop, users can choose according to their needs. Is a directional antenna, some products provide flexible angle adjustment mechanism to facilitate the user to adjust the antenna for the purpose of coverage. Outdoor panel antenna is directional relatively stronger.

Fan-shaped antenna

There are an outdoor antenna for long plate, because the coverage is often a sector, it is sometimes also known as sector antenna (Sector Antenna), as shown above. This type of flat panel antenna gain is larger than the average flat-panel antenna, the antenna is often the internal top to bottom more than a half-wave oscillator, it will become a long plate. Because of its more than one time around the longitudinal arrangement of the vertical lobe performance in the form of multiple sidelobe, very suitable for coverage. Type of antenna horizontal beam width is often 60 degrees, 90 degrees and 120 degrees, a variety of specifications, the actual use is often used together to achieve 360 ​​degree coverage. Such antennas generally do pole mounting, can facilitate the adjustment of inclination to change the coverage.

2.2.2 Yagi antenna (Yagi, Antenna)
Yagi antenna

Yagi antenna array is a series of antenna elements, often we are familiar with the dipole antenna. The array antenna is only one responsible for driving the remaining charge of orientation and reflection. Up the Yagi antenna elements determines the number of directional strength and gain size of the Yagi antenna elements, the more gain the greater. Cover the use of this type of antenna commonly used for its radiation characteristics.

Yagi antenna theory

Generally speaking, the directivity of the Yagi antenna is better than a flat panel antenna, in the past, there are widely used in shortwave broadcast band Yagi antenna. Usually Yagi antenna with 6-12 units. The type of antenna applications in the subway environment more gain in the 9-15dBi. Subway environment is often a relatively narrow area, directional good directional antenna can be completed relatively concentrated and relatively long-range coverage. In the field of mobile communications, the Yagi antenna often used as a centralized coverage of the open plains.

2.2.3 The parabolic the palisade antenna (Grid Antenna)
Grating antenna

The gate antenna is a kind of outdoor high-gain antenna, the general design of a parabolic-shaped common both square and round, also known as the grille antenna. The benefits of the designed parabolic is the effective reflection, gather the electromagnetic waves, which have a better direction, and very suitable for long distance point to point communication. Has often been applied in the WLAN 5GHz distance bridging, is also useful in the 2.4GHz band, the effective range of up to tens or even hundreds of kilometers. Because its focus on energy, the beam width is very small, this type of antenna gain is generally not less than 20dBi, and basically not to close. The reason can be from the radiation analysis: One is radiation is too large, too close, the radiation is too strong, there will be adverse effects to humans and animals as well as other electronic devices; Second, regardless of horizontal or vertical beam width is very small, not Suitable for close cover.
In addition, the reason made the grille like First, reduce the quality of the antenna is to adapt to the outdoor wind block. One of them is to be considered in the outdoor wind resistance, if the antenna area is bigger, will increase wind resistance, resulting in the antenna can not be normal and fixed, and affect the use. Made of palisade can effectively avoid this problem


Sample/Wholesale
Price
Shipping
Carrier
Buy it Now
1 pcs sample
USD
/pcs
USD
Airmail 25days

pcs
USD
/pcs
USD
Airmail 25days


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