A Compact Wideband Slot-Loop Hybrid Antenna With a Monopole Feed

This communication presents a compact monopole-fed slot-loop hybrid antenna for wideband wireless communications. The wideband characteristic is achieved by coupling three different resonant modes of the proposed slot-loop hybrid antenna, namely, a loop mode for the lower band, a slot mode for the middle band and a monopole mode for the higher band. The proposed antenna is built and tested to verify the design strategy. The measured impedance bandwidth (|S₁₁| <; -10B) ranges from 1.82 GHz to 5.68 GHz (102.9%) with stable performance, including bi-directional radiation pattern, vertical polarization and gain. The proposed slot-loop hybrid antenna also shows the merits of compact dimension, low cross-polarization and low cost.