Abstract
ABSTRACTThis work presents a compact planar dual-band rat-race coupler (RRC) using improved microwave C-section. The difference in even- and odd-mode phase velocity is compensated by using wiggly lines in the structure. The wiggle depth is tuned to obtain a characteristic impedance of 70.7 Ohm and phase of 90° at 2.1 GHz and 5.3 GHz. The size of the proposed structure is 0.42 λg × 0.26 λg. The measured and simulated responses are in good agreement. The 1 dB bandwidth of the first and second bands is 670 MHz and 210 MHz, respectively, covering the GSM and WLAN bands. The structure is compact, simple, single layer, and cheap.
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