Multimedia Training Kit Antenna 2212021 Multimedia Training Kit

Multimedia Training Kit Antenna 2/21/2021 Multimedia Training Kit www. itrainonline. org

Antenna • In a wireless system, antennas are used to convert electrical waves into electromagnetic waves. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Antenna Gain • The amount of energy the antenna can ‘boost’ the sent and received signal by is referred to as the antennas gain. • Antenna gain is measured in: – d. Bi – d. Bd - relative to an isotropic radiator - relative to a dipole radiator • The relationship between d. Bd and d. Bi can be represented in the following equation – 0 d. Bd = 2. 15 d. Bi • In most cases, we use d. Bi as our antenna gain measurement. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Antenna Type • Access Point – Omnidirectional – Sectoral Antenna • Client or Point To Point – Yagi – Parabolic Reflector – Tin Can Antenna 2/21/2021 Multimedia Training Kit www. itrainonline. org

At the Access Point • Omnidirectional Antenna • Sectoral Antenna 2/21/2021 Multimedia Training Kit www. itrainonline. org

Omnidirectional Antenna • Omnidirectional antennas have normally a 360 -degree RF radiation from it. • It is normally vertically polarized E-field. • Omnidirectional antenna gain is normally low around 3 to 12 d. Bi. • It is used for Point-to-Multi-Point (P 2 MP) links. • It is quite good for 1 -5 km coverage, especially if the client uses high gain directional antenna. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Omnidirectional Antenna • Ref: RFLinx http: //www. rflinx. com. • Model RFDG 140 6. 5 d. Bi. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Omnidirectional Antenna • Ref: YDI. COM http: //www. ydi. com • Mode: A 2408, A 2412 -D, A 2412 -O gain 8 d. Bi and 12 d. Bi. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Omnidirectional Antenna • Ref: Evercom Taiwan http: //www. evercomind. com • Model OM 88 LNF 12 d. Bi length 121 cm 2/21/2021 Multimedia Training Kit www. itrainonline. org

Omnidirectional Antenna • Ref: jbudisantosa@groundsys. com. • Homebrew 6 d. Bi antenna 75 cm length 2/21/2021 Multimedia Training Kit www. itrainonline. org

Sectoral Antenna • Sectoral is used for the Access Point to serve a Point-to-Multi-Point (P 2 MP) links. • Some sectoral antennas are vertically polarized, some horizontally polarized. • It has higher gain of 10 -19 d. Bi. • Good for serving an area of 6 -8 km distances. • It has narrow horizontal beam-width to about 45 -180 degree. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Sectoral Antenna • Ref: YDI. COM • Model A 2. 45 LP 14 vertically polarized 180 deg. sectoral antenna. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Sectoral Antenna • Ref: Evercom Taiwan http: //www. evercomind. com • Model FG-Panel-56 LB 19 d. Bi 2/21/2021 Multimedia Training Kit www. itrainonline. org

Sectoral Antenna • Ref: johny@marscyber. net • Homebrew 16 d. Bi sectoral. 2/21/2021 Multimedia Training Kit www. itrainonline. org

At Client / Point To Point • Parabolic Antenna • Flat Panel Antenna • Tincan Antenna 2/21/2021 Multimedia Training Kit www. itrainonline. org

Radome Enclosed Antenna • Ref: YDI. COM http: //www. ydi. com • Model P 2412 12 d. Bi. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Yagi Antenna • Ref: Kenbotong Communication Ltd. Taiwan http: //www. kenbotong. com • Model TDJ-2400 C 15 Gain 13 d. Bi 2/21/2021 Multimedia Training Kit www. itrainonline. org

Parabolic Antenna • Ref: RFLinx http: //www. rflinx. com • Model RFL-MANT 19 & RFLMANT 24. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Parabolic Antenna • Ref: Tongyu Communication Equipment Co Ltd. , Guangdong, China http: //www. tycc. cn • Model PST-2424 C-08 -GS High Gain 24 d. Bi Grid Parabolic 2/21/2021 Multimedia Training Kit www. itrainonline. org

Flat Panel Antenna • Ref: YDI. COM http: //www. ydi. com • Model FP 12 & FP 18, 12 & 18 d. Bi. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Backhaul Antenna • High Gain Antennas for Long Range 2/21/2021 Multimedia Training Kit www. itrainonline. org

Antenna Polarization • Electromagnetic radio signal propagate through the air in two polarizations, electric field (E-field) or magnetic field (H-field), crossing 90 -degree each other. An antenna polarization is relative to the E-field of antenna. – If the E-field is horizontal, than the antenna is Horizontally Polarized. – If the E-field is vertical, than the antenna is Vertically Polarized. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Antenna Polarization • No matter what polarity you choose, all antennas in the same RF network must be polarized identically regardless of the antenna type. • Using a correct polarized antenna, it would be possible for us to: – Increase isolation on unwanted signal source. Cross polarization (x-pol) discrimination is around 20 -25 d. B. – Reducing interference. – Defining coverage area. 2/21/2021 Multimedia Training Kit www. itrainonline. org

Antenna Polarization • Horizontally Polarized. 2/21/2021 • Vertically Polarized. Multimedia Training Kit www. itrainonline. org