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A pattern-reconfigurable patch antenna with nine beam directions based on the complementary split-ring resonator (CSRR) loaded ground is proposed. The antenna consists of a coaxial feed rectangular patch on the top layer and a ground plane loaded with four CSRRs on the bottom layer. Two p-i-n diodes are installed on the stub of every CSRR. By changing the states of the p-i-n diodes, the main radiation direction can be switched both in the E-plane and H-plane. The operation principle of the beam switching by loading CSRRs on the ground is discussed. The prototype is fabricated with p-i-n diodes and bias circuit. The measured common impedance bandwidth of |S 11 | less than -10 dB is from 2.42 to 2.48 GHz. The 3-dB beamwidth covers the elevation angles from 0° to more than 60° and full azimuth angles. The antenna has a compact size of 0.82 λ 0 × 0.78 λ 0 , which has the potential to be used in the array design.

A wideband printed tapered-slot antenna with pattern reconfigurability is proposed. The antenna consists of four tapered slots, a reconfigurable microstrip-to-slotline transition, and four p-i-n diodes. With a suitable arrangement of bias voltages, four endfire radiation patterns are realized with a simple bias circuit. The measured relative impedance bandwidth of $\vert{ S}_{11}\vert$ less than ${-} 10~\hbox{dB}$ is 71.3%, which is from 1.57 to 3.31 GHz in all operation modes. The gains for four directions are all higher than 6.4 dBi at the center frequency of 2.4 GHz. The measured and simulated results agree with each other well. The proposed antenna has good performances at four reconfigurable directions in a wide band.