Dual Band Independent Phase-Shift Control Reconfigurable Transmitarray Unit Cell

In this paper, a dual-band independent phase-shift electronically reconfigurable miniature wide band unit cell has been demonstrated for Ku-band. The transmitter layer (M1) exploits two metal patches containing two pin diodes for each lower and higher frequency patch. The receiver layer (M4) includes a pair of passive metal patches at the receiver end that resonates independent frequency bands for lower and higher frequency bands. Four magnetic dipoles are engrave on a single unit cell for low and high frequency bands. Four metal layers reduce the complexity and manufacturing cost of the unit cell. A novel technique with magnetic dipoles helps to miniaturize the unit-cell and diminish the mutual coupling between lower and higher frequency patches. Moreover, four parasitic patches with magnetic dipoles enhance the unit cell's overall bandwidth. Four states of transmission coefficient (S21) are obtainable for independent phase shift for each lower and higher frequency band. The higher band realized a minimum transmission coefficient up to 0.59 dB more than 1.09 GHz bandwidth. In contrast, the lower band exhibits minimum transmission coefficient up to 0.68 dB and 1.27 GHz bandwidth, approximately due to low inter mutual coupling between patches. Thus, 1-Bit independent phase-shift attained for both higher and lower frequency bands.