A Compact Quad-band Monopole Antenna for IoT Application in WSNs/WLAN/LTE Bands

In this paper, a compact quad-band planar monopole antenna for IoT application is designed, fabricated and measured. Four desired resonant frequencies are achieved by an L-shape radiation element and a paperclip meander strip. The proposed antenna achieves resonant frequencies at 0.915/2.45/3.5/5.8GHz with a simple structure and a very compact size of radiation structure of 15.9×25mm 2 . The key parameters of strips and parasitic block in generating resonant frequencies and optimizing impedance matching are discussed in detail. Experimental results reveal stable radiation properties, and adequate impedance bandwidths, thus making it suitable for practical IoT applications in WSNs/LTE/WLAN/GSM bands.