Abstract
Cube satellite missions perform innovative scientific experiments on a low cost developmental platform but have an inherent limitation of size and space. This restricts the total available solar power that can be harnessed and as a result, the radio links operate on stringent power budgets. For improving the available margins for communication in such satellites, it is desirable to improve upon the antenna system performance at the ground station used for the establishment of the links with the satellite. This can be achieved by improving the forward gain, the forward to backward ratio and the directivity of the antenna. This paper describes the electrical simulations and the performance evaluation of the one unit, two unit and four unit circularly polarized crossed Yagi-Uda antenna array designed for communication with amateur radio (HAM) satellites operating over the 434 MHz to 438 MHz Amateur UHF band. The electro-magnetic model has been developed using the 4NEC2 software. The simulations have been validated with the practical field testing performed for estimating the SWR, antenna gain, the forward to backward ratio and radiation pattern for the antenna system.
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