Fig. 1. Antenna array structure and component arrangement

Fig. 2. Stack-up of the multilayer PCB

Fig. 3. Model of the dual-polarized antenna element

Fig. 4. (a) Scattering parameters and axial ratio of the antenna element, (b) far-field pattern at 26 GHz

Fig. 5. Surface electric current distribution under excitations of different feeding ports（26 GHz）

Fig. 6. Real part variation of the input impedance (a) with the width variation of the square patch in the middle-8 layer, (b) with the width variation of the square patch in the bottom layer

Fig. 7. Simulated model of the interconnection from the RF output ports of the chip to the antenna (a) isometric view, (b) bottom and top views

Fig. 8. (a) Simulated results of each RF output port and (b) simulated results of directivities, realized gains and the differences between them for the antenna element under single port excitation

Fig. 9. Photograph of the phased array antenna prototype

Fig. 10. Photograph of the antenna array measurement in the anechoic far-field chamber

Fig. 11. (a) Beam-scanning far-field pattern at the E-plane for H polarization, (b) beam-scanning far-field pattern at the E-plane for V polarization, (c) beam-scanning far-field pattern at the H-plane for H polarization, (d) beam-scanning far-field pattern at the H-plane for V polarization (dashed line: simulation; solid line: measurement)

Fig. 12. (a) Measured normalized cross-polarization power level under 0 degree phase shift condition, (b) measured normalized cross-polarization power level under 110 degrees phase shift condition

Fig. 13. (a) The sketch of the transmit-receive measurement with the phased array as the transmitting antenna, (b) the sketch of the transmit-receive measurement with the standard horn antenna as the transmitting antenna

Fig. 14. Measured transmitting EIRP of the phased array at the 1 dB compression point