Abstract
ABSTRACTIn this work, several techniques are presented to switch operated bandwidth and circularly polarized pattern of the coplanar waveguide (CPW)-fed monopole antenna. A fork-like conducted strip monopole is utilized for the radiating element. Two p-i-n (PIN) diodes are embedded in the antenna structure to realize the switchable capability of frequency band and circular polarization. By electronically turning on or off these diodes, a right-hand circularly polarized (RHCP) wave at 1.57 GHz for the global positioning system (GPS) is not only generated, but a left-hand circularly polarized (LHCP) wave at 2.33 GHz for satellite digital audio radio (SDAR) service system is also achieved. Measured results show that the 3-dB axial ratio (AR) bandwidths are 110 MHz (1.49–1.60 GHz, 7.1%) around 1.57 GHz and 70 MHz (2.29–2.36 GHz, 3.0%) around 2.33 GHz, whereas the impedance bandwidths are 430 MHz (1.38–1.81 GHz) and 670 MHz (2.05–2.72 GHz).
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