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Abstract
A novel approach to the design of a 1-D CRLH leaky-wave antenna has been proposed in which the frequency range of beam scanning can be adjusted without the change of unit cell’s physical length. The presented antenna is based on a unit cell composed of series capacitor connected in cascade with four sections of transmission lines and two symmetrically located transmission-line stubs. The unique feature of such a unit cell is that the phase constant’s slope vs. frequency and the resulting scanning bandwidth can be adjusted by controlling the characteristic impedance and the electrical length of the open-ended transmission-line stubs while all other parameters are fixed. The theoretical investigation as well as experimental results of the developed antenna operating at 2.5 GHz are shown, proving the correctness of the described design technique.