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Cable attenuation is measured as dB per meter (or feet).
 
For example CLF400-cable has attenuation of 12,8dB/100 meters (0,128dB/meter).
 
So 15 meters have 15 * 0,128 = 1,92dB. Notice that connectors add attenuation also.
Connector loss is negligible with respect to the overall cable loss. We suggest adding 0.2 dB for every 1 connector within a cable system for planning purposes.
Transmit power is simple calculation. Transmit power of module plus antennas gain minus cables attenuation. For example modules transmit power is +14dBm, antennas gain +4dBm and cables attenuation -5,5dBm. 14 + 4 - 5,5 = 12,5 dBm
A: A mobile antenna is a type of antenna that generally gives adequate signal even when one is on the road. There are several variables to consider when choosing the best mobile antenna. These variables include the places where you live, where you work, and where you visit regularly, along with your geographical location, and the available frequencies operating in the area. When choosing a mobile antenna that matches your needs, it is usually advantageous to first determine what kind of environment your antenna will be dealing with. You can try looking around the area surrounding your home, your workplace, and the places you regularly visit. These are places where you will more than likely use your mobile antenna. It is often advisable to take note of the layout of the place and obstructions present in these places. By doing this, you can narrow down your search to a few specific types of antennas. There are various kinds of mobile antennas; the portable ones, the hidden ones, and the mounted ones. Mounted antennas can be mounted on top of your vehicle, on the glass, or in a movable base. Some mobile antennas work best when they are mounted and reach a considerable height, while others may work well when hidden. An antenna that can change bands and frequencies without requiring too much effort from you is often a good choice, especially when you are looking for a car antenna. A convenient mobile antenna that does not require a lot of maintenance while on the road is generally the best choice.
? Increased Productivity - WLAN provides "untethered" network and/or Internet access. ? Fast Network Set-up – No need to install cables in the area. ? Installation Flexibility - WLANs can be installed in places where wires can't and also possibility for mobile systems
Radio Frequency (RF) range, especially in indoor environments, is a function of transmitted power, antenna design, receiver design, and interference. Interactions with typical building objects, including walls, metal objects, windows, and even people, can affect how signals propagate, and thus what range and coverage a particular system achieves. The range of coverage for typical WLAN systems varies depending on the number and types of obstacles encountered. Coverage can be provided for a greater area through the use of multiple access points, wireless repeaters or wireless bridges.
The antenna is responding to the ground plane size and shape in the immediate field of the whip. Ground plane effects are significant at low frequencies, because a quarter-wave is fairly long for low-band frequencies.VSWR (voltage standing wave ratio). For example, the VSWR value 1.2:1 denotes a maximum standing wave amplitude that is 1.2 times greater than the minimum standing wave value.
Most require a good ground plane for good performance. If your box is made of plastic, fiberglass or other non-metallic materials, there may not be enough ground plane. If your box is metal, but is small in wavelengths, there may still be inadequate ground plane. One solution may be to use a half-wave antenna if your application will allow the additional height. Half-waves work independent of a ground plane.
FCC is Federal Communications Commission’s certificate for US markets. IC is Industry Canada certification for CanadaCE is certificate to conform requirements of the applicable EC directives.C-Tick is certification to cover EMC regulatory arrangements in Australia or New Zealand.
The two main types of antennas are Omni-directional and directional. Omni-directional antennas radiate RF signal in a 360 degree pattern and directional antennas emit the RF signal in a focused beam similar to the headlight of a car. If your application is a point to point WiFi link like from one building to another you would use a Directional antenna. If you need to send the WiFi signal 360 degrees then you would use and Omni directional antenna. It is also possible to use both antenna types in same system.
The polarity of an antenna is the orientation of the electric field of the radio wave with respect to the Earth's surface. Antennas can have vertical polarization, horizontal polarization or both.
Antenna gain is a relative measure of an antennas ability to direct or concentrate radio frequency energy in a particular direction or pattern. WiFi antenna gain is typically measured in dBi or dBd.
Multipath interference is signal reflections and delayed signal images that interfere with the desired un-delayed and larger desired signal. Multipath causes picture ghosting for over the air analog TV and errors in digital transmission systems.
The term low loss refers to the cables relative low attenuation (loss) over dis-tance. The main difference between standard RG cable and low loss coaxial cable is the shielding. Low loss cable has far better shielding than typical RG style cable thus achieving better low loss characteristics. Additionally, low loss coaxial cables use solid center conductors which offer lower attenuation than stranded conduc-tors that are sometimes found on RG style cables. Low loss coaxial cables are typi-cally used in WLAN, Cellular, PCS, ISM and many other wireless applications.
Connector with reverse polarity is mix of normal male and female connector. Outer side of connector is for example male, but center conductor is female. Below is pictures of RP SMA male and RP SMA female.