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A high-gain, low-cost millimeter-wave hybrid antenna is presented. The designed antenna consists of a dielectric spherical lens with low dielectric constant fed with microstrip patch antenna. The design parameters for achieving optimal operation of the proposed hybrid antenna are analyzed extensively in order to understand the antenna operation and improve its performance and characteristics. The impedance bandwidth of the prototype is ~6.7%. A high gain of 21.7dB is achieved at 60 GHz using a 2 cm diameter dielectric lens. The proposed antenna is suitable for unlicensed millimeter-wave ISM-band applications.