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 Journal of the Korean Institute of Electromagnetic and Science 2003;3(1):62-66.
 Coupled Line Phase Shifters and Its Equivalent Phase Delay Line for Compact Broadband Phased Array Antenna Applications Sang-Min Han, Young-Sik Kim Department of Radio Sciences and Engineering, Korea University Abstract Novel coupled line phase shifters and its equivalent phase delay line for compact broadband phased array antennas are proposed. These phase control circuits are designed to be less complex, small size and to use a less number of active devices. The phase shifter is able to control a 120$^{circ}$ phase shift continuously, and the phase delay line for a reference phase has a fixed 60$^{circ}$ shifted phase. Both have the low phase error of less than $pm$3.5$^{circ}$ and the low gain variations of less than 1 ㏈ within the 300 MHz bandwidth. These proposed circuits are adequate to form the efficient beam-forming networks with compactness, broadband, less complexity, and low cost. Key words: Phase Shifters, Phased Array Antennas, Beam-Forming Networks, Coupled Lines
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