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

By M. Karimi, Y. Labrador

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R. & Mönich, G. (1990). Main-beam polarization properties of modified helical antennas, IEEE Transactions on Antennas and Propagation, Vol. 38, No. 5, (May 1990), pp. 589-597, ISSN 0950-107X Kraus, J. D. & Williamson J. C. (1948). Characteristic of helical antennas radiating in the axial mode, Journal of Applied Physics, Vol. 19, No. 1, (January 1948), pp. 87-96, ISSN 00218979 Kraus, J. D. (1949). The helical antenna, Proceedings of IRE, Vol. 37, No. 3, (March 1949), pp. 263-272, ISSN 0096-8390 Kraus, J.

44) 40 12 Advances in Satellite Communications Will-be-set-by-IN-TECH 3. 033Cn2 (z1 ) 1 κ m L0 1 6 5/3 ∞ 1 ∑ i! i =0 − exp and ρ = ρ = ⎧ ⎪ ⎪ ⎪ ⎪ ⎨ ρ2 − 2ρ 1 κ m L0 ρ L0 2i 1 F1 1 F1 z2 2 zL κ+ cos θ + L2 κ+ k k 5 κ2 ρ 2 −i − ; 1; − m 6 4 1 2 2ρ − ;− ;− 3 3 L0 in ρ = ρ − , (46) zL κ+ k (47) ⎪ ⎪ ⎪ ⎪ z ⎩ zL κ in ρ = − L κ+ . + k k Fig. 8 shows that the DOC in the uplink is almost unity within the size of an aperture diameter of the receiving antenna of the GEO satellite (ρ 2ae ). It means that the spatial coherence of received waves keeps enough large within the receiving antenna.

12. Geometry and radiation patterns of reduced size BHA, a) and b) respectively. a) b) Fig. 13. 1 GHz. 0. , 1991; Zimmerman, 2000) of the lobe direction for the different values of phase velocity, Fig. 14. 4 Fig. 14. The comparison of the simulated, calculated and experimental results for the lobe direction vs. frequency. 2 The quadrifilar helical antenna The quadrifilar helical antenna (QHA), also known as the Kilgus coil, is mostly used for telemetry, tracking and command (TT&C) satellite systems due to its simplicity, small size, wide circularly polarized beam and insensitivity to nearby metal objects.

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