ABSTRACT
This paper illustrates the outcome of different feeds used in cylindrical liquid antenna. They are as follows: Co-axial feed, L-shaped feed, Conical feed and Circular Disc feed. These are the contacting methods for feeding of liquid antennas. We have used CST Studio Suite and the PSO (Particle Swarm Optimization) algorithm to simulate the results of different feeds and optimize the resonant frequency respectively. This experiment was conducted at a frequency of 4 GHz by changing the feed lines and keeping the inner radius of the cylinder, height of the liquid and dielectric constant to excite the different modes of antenna for multiple applications. Investigation interprets that the varying electric field line for different feeds changes the maximum gain over frequency and the resonant frequency is constant for all feeds since height, radius and permittivity do not change. The graphs obtained by changing different feeds shows that the directivity are maximum for circular disc feed and angular width is maximum for conical feed.
