Advances in Satellite Communications by M. Karimi, Y. Labrador

By M. Karimi, Y. Labrador

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Decrease in the spatial coherence of transmitted waves due to a wave front distortion. modulus of the complex degree of coherence (DOC) and the BER derived from the average received power. Sec. 3 shows the results of analysis of the effect of atmospheric turbulence on satellite communications in Ka-band at low elevation angles. We analyze the DOC and the BER derived from the average received power for the uplink and the downlink, respectively. Furthermore, we analyze the effect of atmospheric turbulence on the BER when we make an aperture radius of the ground station’s antenna large in order to increase the antenna gain and improve BER performance.

Tapered BHA is consisted of two sections of equal axial lengths, one corresponding to the first half of the conical BHA and the other to the half of the standard BHA. According to the radiation patterns in Fig. 11 b) and the results given in the Table 1, the tapered BHA provides the best performance of the BHA considering the F/B ratio and gain with satisfying axial ratio and decreased HPBW. It is important to note that the conical and tapered BHA’s give better radiation characteristics than the standard BHA.

2001). , 2006). Radiation pattern of fractional turn resonant QHA is cardioid-shaped and circularly polarized with wide beamwitdh, but by extending the fractional-turn QHA to an integral number of turns shaped-conical radiation pattern can be obtained for many applications in spacecraft communications (Kilgus, 1975). The Kilgus coil consisted of four wires λ/2 long and forming a ½ turn of a helix, generates a cardioid-shaped backfire radiation pattern with circular polarization and a very high HPBW 22 Advances in Satellite Communications when two pairs are fed in phase quadrature and lower ends are short-circuited (Kilgus, 1968, 1974).

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