Abstract
A new conflguration of Yagi antenna is proposed, which can improve the forward/backward ratio (f/b) signiflcantly while maintaining a high gain. This conflguration involves the addition of one radiating element to the original Yagi array. This additional element may arrange on parallel (side-by-side) or collinear to a radiating dipole of the original Yagi antenna. It is shown here that the technique is most efiective for collinear conflguration (exhibits smaller mutual efiects) and that there then exists an optimum length and position for the added element. The amplitude of the excitation of the additional element determines the angular location of the back lobe reduction. To demonstrate the major beneflts, comparisons are made among the proposed and conventional Yagi conflgurations. Numerical and measured results of our design show more than 20dB front to back ratio at 2.4GHz. Moreover, the proposed array represents a simple and valuable alternative to the stack Yagi antennas as the obtainable radiation characteristics are satisfactory in terms of both forward and backward gain.
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