Circularly-Polarized Discrete Lens Antennas in the 60-GHz Band

This paper presents the design and demonstration of two circularly-polarized transmit-arrays operating in the 60-GHz band and generating a broadside beam and a 30°-tilted beam respectively. These arrays have a fairly simple structure with only three metal layers and are fabricated with a standard printed-circuit board technology. The simulated results show the performances of the unit-cells as well as the whole arrays, and detail their power budget. The experimental results in V-band are in very good agreement with the simulations and demonstrate very satisfactory characteristics. Power efficiencies up to 53.7% are reached with a 1-dB gain-bandwidth up to 9.1%, and low cross-polarization level

Phase noise improvement in a loop configuration of oscillating antennas

International audiencePhase noise in a four-element array of oscillating antennas is analyzed for a loop configuration and a unilateral coupling topology. It is demonstrated that this structure, basically designed for circular polarization (CP) applications, also yields a 75% reduction of the near-carrier phase noise compared to a single oscillator. Experimental validation is made at 4 GHz. For this structure, deviation of the coupling phase from its nominal value has no influence on the phase noise performance

Coupled oscillator array generating circular polarization

International audienceIn this work, a four-element oscillator array using linearly polarized elements is designed to generate circular polarization. The oscillators are coupled in a loop arrangement with unidirectional coupling. The analysis of this new arrangement is developed and confirmed by circular polarization radiation pattern measurements showing a wide axial ratio beamwidth both in principal and diagonal planes

Cavity-backed antennas integrating a self-oscillating mixer

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BPSK and QPSK modulations of an oscillating antenna for transponding applications

International audienceAn oscillating antenna allowing binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) is demonstrated. The modulating signals are applied to a PIN diode switch and an injection-locked oscillator. Experimental results are presented, including constellation diagrams of the radiated signal and typical waveforms of demodulated signals