Structural analysis of log periodic and monopole antennas considering cyclonic, interference effects
Cyclonic factor; Interference factor; LPDA; Monopole; Structural Analysis
The Broadband High Frequency (HF) Transmit and Receive Antenna System are used as Surface Waveover the Horizon Radars (SWOTHR) for surveillance application. HF Transmit & Receive antenna systemconsists of transmit antenna and receive antenna array operating in HF band 2 to 30?MHz, which have tobe installed near sea shore. The antennas are of Monopole and Log periodic Dipole wire mesh antenna (LPDA). The height of Monopole and LPDA depends on wavelength ? of antenna. For HF band, the height range of receive is from 5 to 25m and transmit is from 10m to 100m. In this study, 10m high monopole for receive and 55m high 60m long Log periodic antenna for transmit are considered. Structural analysis and design of these antennas is critical due to installation at sea coasts. Based on the application, receive antennas are designed as array type consisting of 64 numbers monopoles as 32 doublet's and transmit antennas are 2 numbers of LPDA. If the same height structures installed side by side as an array, wind interference is caused by the obstruction caused by a structure in the path of wind. The antennas are installing on sea coast subjected to cyclonic storms. Dynamic effect of cyclonic and interference of wind is studied. Wind loads are calculated as per IS: 875 part 3:2015. Antennas are analyzed using FEM software STAAD Pro Advanced Connect Edition. Both antennas are analyzedfor self-weight, wind loads considering cyclonic and interference factors. Natural frequency of structure is determined using modal analysis to examine the problems of wind induced oscillations and dynamic effects of wind. 2023 Author(s).
Gullapalli V.L.; Raghunandan Kumar R.; Reddy G.R.
AIP Conference Proceedings, Vol-2763, No. 1
https://doi.org/10.1063/5.0158765 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85176806612&doi=10.1063%2f5.0158765&partnerID=40&md5=61097caf8e5560d01121de7dcb34c525
Gullapalli V.L., Department of Civil Engineering, Christ University, Karnataka, Bangalore, India; Raghunandan Kumar R., Department of Civil Engineering, Christ University, Karnataka, Bangalore, India; Reddy G.R., Structural Engineering Department, VeermataJijabai Technological Institute (VJTI), Mumbai, India