Analysis Of Radiation Pattern and Gain Offset VSAT Antenna Ku-Band Frequency

Very Small Aperture Terminal (VSAT) technology is a ground terminal technology used in satellite communication devices. Emits focused beams through a directional Radiation pattern in VSAT, which enhances antenna performance by minimizing observed interference through radiation pattern, gain, and also side lobes. This research uses the Ku-Band frequency range, which spans from 12.5 to $\mathbf{1 2. 7}$ GHz. It has a relatively small antenna, measuring between 0.8 and 1.4 meters in diameter. Offset VSAT antennas are created by using different feed types, such as circular feed horns and pyramidal feed horns, and by increasing the antenna diameter. The application of circular feed significantly improves the radiation pattern and gain in the offset antenna using pyramidal feed in $1.4 \mathrm{~m} 27.9 \mathrm{~dB}$ optimization using circular feed horn, the gains become $31.2 \mathrm{~dB}$. The side lobe levels, initially measured $31.60 \mathrm{~dB}$, are reduced through the use of circular feed −41 dB. So, an offset antenna using a circular feed has the most optimal radiation pattern because it produces high gain with low side lobes and a narrower beamwidth so that interference can be suppressed optimally.