This paper proposes a reflector backed dipole antenna whose reflector is composed of frequency selective reflector (FSR) and the size of the FSR elements aligned in the both side columns is changed. Since the width of the frequency selective reflector, which is composed of an array of the frequency selective elements, is chosen discretely, it is difficult to design an arbitrary beamwidth of the reflector backed antenna because the beam-width of the reflector backed dipole antenna can be adjusted by the size of the reflector. The proposed antenna configuration can achieve arbitrary beamwidth by using different size of the FSR elements aligned in the both side columns. This paper also shows the condition of the FSR element size aligned in the both side columns to obtain sector radiation pattern.
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