Self-Oscillating Semi-Ring Active Integrated Antenna With Frequency Reconfigurability and Voltage-Controllability

摘要

A compact frequency-agile self-oscillating semi-ring active integrated antenna is presented and investigated. Without changing the circuit footprint, the proposed active antenna achieves frequency reconfigurability and voltage-controllability simultaneously with a PIN diode, a varactor diode, and proper biasing network. The oscillation frequency can be controlled from 4.47–4.85 GHz in the OFF state and 5.03–5.33 GHz in the ON state. The VCO gains are 17.7 and 16.4 MHz/V in the two states. Benefitting from the feedback path, the proposed active antenna, with a miniature size of 0.046 $lambda_{0}^{2}$, shows well-behaved phase noises of ${-}106.2$ and ${-}98.7$ dBc/Hz at a 1-MHz offset from the carriers.