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By M. Karimi, Y. Labrador

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Examined bifilar scanning helical antenna with large pitch angle terminated with a resistive load. This antenna generates circularly polarized scanning radiation pattern from backfire to normal. 5 GHz (Nakano et. al, 1991). Fig. 13 illustrates typical radiation patterns, the backfire conical and normal radiation pattern reaching the antenna gain of 10 dB, Fig. 13 a) and b), respectively. 19 Helical Antennas in Satellite Radio Channel a) b) Fig. 11. a) Standard, conical and tapered BHAs, and b) their radiation patterns.

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. 033Cn2 (z1 ) 1 κ m L0 5/3 ∞ − exp 1 ∑ i!

11, (November 2007), pp. 3087-3090, ISSN 0018-926X Barts, R. M. & Stutzman, W. L. (1997). A reduced size helical antenna, Proceedings of IEEE Antennas and Propagation Society International Symposium, ISBN 0-7803-4178-3, Montreal, Canada, July 1997. 24 Advances in Satellite Communications Blazevic, Z. & Skiljo, M. (2010). Bandwidth of the Helical Beam Antenna Loaded by a Dielectric Rod, Proceedings of ICECom, ISBN 978-1-61284-998-0, Dubrovnik, Croatia, September 2010. Bulgakov, B. , Shestopalov, V.

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