Glidepath Antenna Design

The GP antenna comprises a lattice mast with three dipole antenna arrays A1, A2 and A3. The mast using the dimensions (W x D) 450 x 650 [mm] is rectangular and may be mounted by way of stirr ups.The mast is divided in sections of 3.50 m in length each, and can be adapted to satisfy nearby specifications.Each mast section comprises 4 bars connected collectively via struts and butt straps by indicates of rivets and screws. It's produced of aluminium ALMgSi, the metal parts are galvanized and all screw connections are created of metal V2A. The base frame is made of welded metal profiles. It consists of forked bolts which allow the mast to become tilted. The erected mast is fixed with supports. The mast suggestion is made of welded U-profiles. It includes two deflection rollers produced of polyamide for an auxiliary guy wire when installing the antenna dipoles, and 2 obstacle lights. The antenna mounting for the dipole array is really a buckled C-profile which permits a horizontal adjustment of the dipole array by about ±350 mm. The C-profile is mounted at a vertical tube 1 m long that is fixed to the mast by cross-strucks. With the vertical tube a fine vertical adjustment of the antenna array is possible. In addition the height of the complete body can be adjusted in actions of 500 mm. The mast is painted in red and white for 1.75 m alternately.The 3 dipole antenna arrays A1, A2 and A3 have a horizontal polarization and an identical design using the dimensions (H x W x D) 500 x 2000 x 250 [mm]; they're mounted over 1 an additional and somewhat offset. The antennas are protected against weathering exposure with a polyester glass fibre cover. They remain operational, even in case of substantial formation of ice. Atmospheric discharges are eradicated reliably, since all metal parts of the antenna are linked to floor.The reflector surface area in front of the GP antenna consists of a welded construction-steel internet which is embedded in gravel and which should be grounded. If preferred, the construction-steel web can also be embedded in asphalt, concrete or similar. The use of structural metal mesh isn't mandatory. Depending on the local conditons it may be established during website survey, if it is suggested or necessary.