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Two types of millimeter-wave planar array antennas for electronic beam-scanning systems are developed in this work. Several vertically-long sub-arrays are arranged horizontally for beam forming in array signal processing of horizontal plane. On the other hand, the vertically-long subarrays are developed in travelling-wave design. The travellingwave feeding system is advantageous for simple configuration and low-loss operation in millimeter-wave band. Waveguide antennas and microstrip antennas are developed for sub-arrays of electronic beam-scanning systems. Features and advantages of microstrip antennas and waveguide antennas designed for beamscanning systems are discussed in this paper.

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