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The prospects for and the state of the art of adaptable RF hardware are reviewed, focusing primarily on the traditional frequency planning bottleneck, the filtering stages. First, a case is made that even banded systems can be greatly impacted by a modest amount of tuning. This is done by showing the results of a traditional fixed system in an unlicensed band upgraded with a programmable front–end...
This paper demonstrates the concept of a field-programmable filter array which can be configured in the field after fabrication. The proposed array is composed of tunable resonators and can have multiple functionalities by rerouting signals from input ports to output ports. Signal rerouting can be achieved by controlling the inter-resonator coupling with a wide tuning ratio of coupling coefficients...
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