Electronic-based tuning started to appear in the 1960s for two reasons. First, the solid-state variable-capacitance diode (varactor or varicap) was developed and commercialized, significantly ...
It involves the integration of a varactor to dynamically compensate for fluctuations in the input impedance of the rectifier. The direct biasing of the varactor is strategically achieved through a ...
The most practical reconfiguration elements are electrical‐based ones, which usually are various kinds of electrical switches or variable capacitors (i.e. PIN diodes, varactor diodes, RF switches, etc ...