Directional Antenna

The antenna of the radio frequency (called "RF") refers to the entry within the coverage area

. A variety of antenna coverage. For a place to select the correct antenna, namely, to determine what kind of antenna coverage pattern to best meet the coverage requirements of the places. Understand your environment will help determine the correct antenna set.

Basically, the antenna is divided into two types:

The omni-directional antenna with 360 degrees of a horizontal plane overwrite mode. Overwrite mode is circular (like a donut). The type of antenna most suitable for square or nearly square area.

Directional antenna will cover the mode is concentrated in one direction. This will produce an almost conical coverage pattern (like a torch of light). The orientation of the antenna beam width angle specified. The beam width angle from 90 degrees (a degree of orientation) to a minimum of about 20 degrees (very directional). Directional beam can be transmitted long distances, but narrower coverage, ideal for long and narrow area, corners and outdoor point-to-point applications.

Get coverage:

Enhance the coverage within the RF beam width, which is called the antenna gain is measured in dB (decibels). The antenna gain can improve the signal range, and better communication.

Calculate the range:

To calculate the increased range of indoor spaces, the antenna gain for each additional 1 dB will increase the range of about 2.5%. If unimpeded outdoor spaces, the antenna gain for each additional the 1dB large an increase of 5% range. The total number of obstacles and type of the actual results, as the site may be.

To set the location of the antenna:

The antenna is set to the appropriate position (direction) at the scene to help determine the maximum coverage area. In general, to the extent practicable, the antenna should be installed in as far as possible the height, the fewer obstacles place the better. If the sending and receiving antenna are located on the same height, and with each other in direct line of sight alignment, you can achieve the best performance. "Access point" should be set up on the ceiling or near the ceiling of the place.

If omni-directional antenna installed in the bottom of the coverage area (table, the work of stage ... etc.), the vertex point of the antenna. If omni-directional antenna installed on top of the coverage area (ceiling or wall height), the vertex point of the antenna. The omni-directional antenna should be possible to set the center point of the coverage area. If you want to install on the ceiling, try to make the antenna and the sprinkler heads, metal lighting to maintain a distance of at least two feet.

The use of directional antennas, please refer to the direction of the coverage area. To send and receive all of the antenna characteristics are the same. If installed in the outdoor antenna, please note that the coaxial RF cable should be as short as possible, in order to minimize RF losses - antenna cable attached to the length of the optimization. If necessary, you can use the coaxial extension cable; However, the better "access point" on the place near the antenna, Ethernet cable to pull the "access point".

by: planner

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