Analysis and Design of a Millimeter-Wave Cavity-Backed Circularly Polarized Radiator Based on Fundamental Theory of Multi-Port Oscillators

作者：Nazari Peyman^*; Jafarlou Saman; Heydari Payam

来源：IEEE Journal of Solid-State Circuits, 2017, 52(12): 3293-3311.

DOI：10.1109/JSSC.2017.2753823

• Cavity
• circular polarization
• millimeter-wave (mm-wave)
• multi-port
• multi-port oscillator
• radiator
• ring oscillator
• silicon
• theory

This paper presents the design and implementation of a millimeter-wave fundamental frequency circularly polarized radiator, which employs a multi-port cavity as the core of a high-Q resonator, a power combiner, and an antenna. A general theory of multi-port oscillators-and in particular, the widely used circularly symmetric oscillator topologies-is presented, which quantitatively investigates and predicts all possible oscillation states, their associated modes of operation, and the oscillation stability. The outcomes of this theory are utilized to design a power-optimized eight-port rotationally symmetric radiator, excited at the oscillation state with a 45 phase difference between the adjacent ports, which, in turn, enables a high-efficiency circularly polarized radiation. Fabricated in 0.13-mu m BiCMOS process, this cavity-backed circularly polarized radiator operates at the frequency of 114 GHz and achieves 14.2-dBm equivalent-isotropic-radiated power (EIRP), 5.2% dc-to-EIRP conversion efficiency, 8.2 dBm radiated power, 1.3% dc-to-radiation efficiency, and -99.3 dBc/Hz phase noise at 1-MHz offset, without using silicon lens.

• 出版日期2017-12