All kind of antennas to the transmitters


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

pcs
USD
/pcs
USD
Airmail 25days


2.1 omnidirectional antennaExisting omnidirectional antenna shape is generally cylindrical, also known as a half-wave dipole antenna (dipole). Corresponding points in both indoor and outdoor, the most important difference in the size of the gain. If the single is considered from the point of view of the increased coverage, you can use omni-directional antennas, because do not need to take into account the antenna placed, the angle, the extension cord attached for the average user is very convenient and free on the desktop any corner. Outdoor omnidirectional antenna can provide a wide range of open areas covering the antenna itself after rain and lightning and other treatment, can effectively work in a relatively harsh environment, generally pole installation. Need to pay attention to the contrast gain purchase omnidirectional antenna VSWR, vertical beamwidth, lightning protection measures, etc. parameters performance.2.1.1 ordinary omnidirectional antennaGeneral indoor dipole antenna does not exceed 10dBi, common 5 ~ 8dBi gain the antenna radiation like a spherical or ellipsoidal meet all corners of the room, and on the lower coverage range closer; full range of outdoor antennas are generally used for point-to-multipoint (PtMP), because of its small vertical lobe, is relatively high if the antenna set, often appear at a distance just below it or close area not covered by the case, but its the overall coverage. So buy omnidirectional antenna when the need to distinguish between the indoor and outdoor antenna and the application.
2.1.2 Indoor Xiding antennaCeiling Antenna is a special kind of omni-directional antenna. Ceiling antenna taking into account the constraints of wiring, use ceiling environment, its gain is generally 3-5 dBi.
Home users, and the ceiling antenna is not very popular, because it involves the AP install location. The common solution is to use extension cable to connect the AP and the antenna or RF connection PoE Ceiling AP.
There are still a relatively common with enhanced indoor cell phone signal coverage, the use of frequency bands between 800MHz-900MHz.
As shown above, the ceiling antenna vertical radiation pattern down radiation to ensure complete coverage of the area below. Radiation of the antenna above the ceiling antenna will have a obvious sign weakened, both to ensure the purpose of coverage, but also to prevent the leakage of wireless information to achieve the effect of wireless security protection.
2.2 directional antennaDirectional antenna relative to the omnidirectional antenna use more targeted. Is usually used in a special area coverage, point-to-point connection, long-distance transmission, and so on. And the appearance of the directional antenna, the gain of the same, the following are some common directional antenna.2.2.1 Tablet Directional Antenna (Patch Antenna)The panel antenna with more directional antenna, its form is relatively simple, generally square or elongated,
The internal arrangement of a plurality of transducers, the radiation in the same direction in order to increase the gain. The transducer determines the number of the antenna gain, typically 6-14dBi high attainable 20dBi above.
This type antenna may be used as the cover, but also the transmission can be used both in indoor and outdoor use. Although the appearance of the square plate, but different installation, can pole the installation, a wall-mounted display, some can be placed on the desktop, users can choose according to their needs. Some products also provide flexible angle adjustment mechanism is a directional antenna, facilitate the user to adjust the antenna for the purpose of coverage.
Relatively speaking, directional outdoor panel antenna will be stronger. The following is a comparison of the interior and exterior of the vertical direction of the flat-plate antenna radiation diagram.
Outdoor antenna as well as a long plate, because the coverage is often a sector, it is sometimes also known as sector antenna (Sector Antenna), as shown above.The type of flat-panel antenna gain is larger than the average flat-panel antenna, because the antenna is often internal top to bottom, there are more than a half-wave oscillator, it will be a long plate.Its longitudinal arrangement of a plurality of time around, the vertical lobe performance in the form of a plurality of sidelobe, is very suitable for covering.The level of class antenna beamwidth often 60 degrees, 90 degrees and 120 degrees of a variety of specifications, actual use often plurality used together to achieve a 360 degree coverage.Such antennas generally do pole is installed, you can easily adjust the inclination to change the coverage.
2.2.2 Yagi antenna (Yagi Antenna)Yagi antenna is composed of a series of antennas antenna array composed of elements often we are familiar with the dipole antenna. The antenna array only one responsible for driving the remaining charge of orientation, reflection, etc.. Determine the number of antenna elements composed of a Yagi antenna Yagi antenna directivity strength and size of the gain, the constituent elements of the more, the greater the gain. Such antennas because of their radiation characteristics commonly used as a cover to use.
Generally directional Yagi antenna is better than the flat-panel antenna, there is widespread use of shortwave broadcast band Yagi antenna. Yagi antennas usually 6-12 units. The type of antenna in the subway environment applications more gain in 9-15dBi. Subway environment is often a relatively narrow area, the need for better directional antenna directivity, can be completed relatively concentrated but more long-range coverage. In the field of mobile communications, Yagi antenna is often used as a the open plains centralized coverage.
2.2.3 The parabolic the palisade antenna (Grid Antenna)
The palisade antenna is a kind of outdoor high-gain antenna, the general design into a parabolic shape, square and round two, also called antenna grille. Designed as the benefits of the paraboloid can be effective reflection, aggregation of electromagnetic waves, and thus have a better directivity is very suitable for long distance point-to-point communication.
As the long-distance bridging of 5 GHz WLAN applications often also useful in the 2.4GHz band, the effective distance of up to tens or even hundreds of kilometers. Because its energy is concentrated beam width is very small, so this type of antenna gain is generally not less than 20dBi and basically do not do up close. Reasons for its radiation to analysis: First, the radiation is too large, too close, the radiation is too strong, adverse effects to humans and animals as well as other electronic devices will; Second Whether horizontal or vertical Beamwidth are small, do not for close coverage.In addition, the reason made gridlike First, to reduce the antenna quality, adapt to outdoor wind blocking. To be considered one of the outdoor one wind resistance, if the antenna area is bigger, is bound to increase wind resistance, causing the antenna is not properly fixed, affect use. Made palisade can avoid this problem effectively.

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

pcs
USD
/pcs
USD
Airmail 25days


This entry was posted in News. Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *