High Gain Monopole Antenna For VHF And Microwave Interferometers

Ng, Yun Jiek (2017) High Gain Monopole Antenna For VHF And Microwave Interferometers. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text (24 Pages) High Gain Monopole Antenna For VHF And Microwave Interferometers 1.pdf - Submitted Version Download (688kB)

Abstract

Monopole antenna is one of the most widely used antennas around the world owing to the radiation characteristics that it exhibits.Its omnidirectional radiation properties,frequency range,light weight,simple structure, ease of fabrication and low cost make it possible to be used in numerous applications.The only problem is that a simple monopole antenna can only achieve a relatively low gain.This means low sensitivity and low efficiency on the antenna performance.Therefore,a high gain wire monopole antenna is designed and constructed in this project.The antenna is composed of a number of main radiating elements placed collinearly and separated by phasing coils,with a total of four radials made as the virtual grounding.With the aid of CST (Computer Simulation Technology) Microwave Studio,two separate collinear monopole antennas are designed to operate at the VHF and microwave band respectively,one at 60 MHz and another at 1 GHz.Through parametric study,the most satisfactory results are obtained.Simulation results clearly show that the 60 MHz and 1 GHz collinear antennas are able to achieve a gain of 3.238 dB and 10.74 dB respectively. Having a return loss of -26.225 dB and -23.936 dB,both antennas exhibit omnidirectional radiation patterns. Simulations results for farfield radiation patterns and VSWR of both antennas are presented and discussed.The antennas are designed to be used as lightning interferometers.Source of electromagnetic radiation generated from lightning flashes can be detected and located.

Actions (login required)

View Item