International Symposium on Antennas and Propagation
Propagation Characteristics of Periodic Metal Strips on Dielectric Layer in Parallel Plate Waveguide
Jung-Rae Cho, Dong-Chul Park, Dong-Seok Kim,
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In a phased array antenna, the phase shifters, T/R modules, and beam-steering control circuitry account for the major hardware cost. Therefore, the phase shifters are being actively investigated for realizing the low cost phased arrays . The Radant lens, which is one of the phase shifters, reduces many of the fabrication problems that increase the cost and the transmission loss associated with the conventional implementation of a passive phased array . The Radant lens is constructed from a set of parallel metal plates. In between each set of plates is dielectric layers on which are two periodic strips of metal cross-connected by a set of the diodes. The operating principle of the Radant lens is that the phase shift through the lens changes when the diodes in one layer are turned on or off. The amount of the phase shift per dielectric layer can be controlled by varying the structure of the metal strips . In this paper, 11.25? , 22.5? and 45? layers, which can be used for X-band 4-bit Radant lens phase shifter , are simulated by using CST’s MWS(Microwave Studio). The diode ON and OFF states are regarded as the short and open circuit, respectively, in the simulation. Also, the equivalent circuit of each layer is found and simulated by using Agilent’s ADS(Advanced Design System). Validity of the equivalent circuit is verified by comparing the simulated results with the measured ones.