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An S-band low-sidelobe antenna is designed and proposed which fosters the character of small size and simple structure with wide bandwidth in this paper. The antenna to be discussed takes the advantage of short -focus paraboloidal reflector with round chip and is fed with half-wave dipole. Adjusting the amplitude-phase distribution of aperture field of the antenna, the demand for low-sidelobe and high gain is satisfied through a wide frequency range. The antenna contributes to the portable device for its short vertical length. Simulated on CST MICROWAVE Studioreg, E-plane and H-plane directional diagram results illustrate that the antenna satisfies following character through a wide frequency range: the maximum sidelobe les-20 dB, the gain ges 20 dBi, the half-power beam width (HPBW) les 20deg. Besides, within the frequency range of the central frequency plusmn 50 MHz the antenna shows ultra-low sidelobe and satisfies its maximum side lobe les-30 dB. At the same time, the collision between low-sidelobe and beam width is solved successfully.

low-sidelobe; field distribution; half-power; low-backlobe; rotating paraboloid