Low-Profile Wideband Slot-Loaded Patch Antenna With Multiresonant Modes

Abstract

A low-profile and wideband patch antenna is proposed for base station applications. In order to realize a wide band, two types of slots are adopted and three resonant modes are constructed within a band of interest. The mode analysis is conducted to clarify the wideband performance. The designed antenna has an impedance bandwidth of 52.7% (from 1.62 to 2.78 GHz) with a low-profile structure of ${\text{0.7}}\lambda _{0}\,\times \,{\text{0.47}}\lambda _{0}\,\times \,{\text{0.084}}\lambda _{0}$ , where $\lambda _{0}$ is the free-space wavelength at the center frequency. The measurement results of a prototype agree well with the simulations. The measured average gain is 6 dBi, and the radiation patterns remain stable in the required band with low cross polarization, low backlobes, and nearly identical E- and H-plane patterns. The proposed multiresonant antenna can cover six bands of wireless communication, such as DCS, PCS, UMTS, WLAN, LTE2300, and LTE2600, exhibiting great potentials in applications of multiband wireless communication systems.