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Short helical antenna array fed from a waveguide

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3 Author(s)
Nakano, H. ; Hosei University, Tokyo, Japan ; Asaka, N. ; Yamauchi, J.

An array consisting of short helical antennas is fed from a single rectangular waveguide. Stubs are introduced near the array elements in order to make a matching condition between the array elements and the waveguide. On the basis of a transmission line theory, a coupling phase and a coupling factor are determined. The mechanical rotation is applied to each array element so that in-phase condition at the aperture may be formed. Excellent agreement between the calculated and experimental results is demonstrated in the arrays of five, seven, and nine helical antennas.

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Antennas and Propagation, IEEE Transactions on  (Volume:32 ,  Issue: 8 )