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A practical method for the design of dual-band decoupling and matching networks (DMN) for two closely spaced antennas using discrete components is presented. The DMN reduces the port-to-port coupling and enhances the diversity of the antennas. By applying the DMN, the radiation efficiency can also be improved when one port is fed and the other port is match terminated. The proposed DMN works at two...
A design method for dual-band Class III loaded-line phase shifters is presented. The center line and the loads of the phase shifter are designed to meet dual-band requirements. Two single-pole-double-throw switches are used to switch between two reactive loads in the two phase states. Four possible reactive loads are considered and closed-form formulas are provided to achieve dual-band operation....
This paper proposes a novel Doherty power amplifier (PA) that realizes concurrent dual-band operation. A T-network is used to implement a dual-band impedance transformer and a phase shifter simultaneously. To prove the concept a PA is designed operating at 900 MHz and 2000 MHz simultaneously. In the experimental results, the concurrent dual-band PA achieves a drain efficiency of 39.8% with an output...
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