For multi-beam control and compact implementation, the proposed eight-port feeding network consists of an integrated beam-control block with a two-stage RF switch block, 12 quadrature hybrid couplers, and 12 90° phase shifters, and was designed and fabricated on a circular three-layer 1.2 mm FR-4 substrate. The diameter of the fabricated network is ~0.47 λ 0 at 915 MHz.

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[Antenna Specification]

​Frequency band : 902-928 MHz

Maximum insertion loss : 4.5 dB

Amplitude and phase imbalance : ± 1.3 dB, and ± 17.5°

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Usage : Wireless item management