Leonardo Ranzani

Micro-Fabricated 130–180 GHz Frequency Scanning Waveguide Arrays

This paper describes frequency scanning slot arrays operating from 130 to 180 GHz. The arrays are micro-fabricated using the PolyStrata sequential copper deposition process. Measured reflection coefficient and radiation patterns agree with HFSS full-wave simulations. The voltage standing wave ratio is less than 1.75:1 over the entire frequency range, and the measured scanning is 1.04°/ GHz from 130 to 150 GHz and 32.5° over the full frequency range. The measured gain is 15.5 dBi for a 10-element array at 150 GHz and 18.9 dBi for a 20-element array at 150 GHz with about 3 dB of variation over the scan range.

Nonreciprocal Microwave Signal Processing with a Field-Programmable Josephson Amplifier

We report on the design and implementation of a Field Programmable Josephson Amplifier (FPJA) - a compact and lossless superconducting circuit that can be programmed \textit{in situ} by a set of microwave drives to perform reciprocal and nonreciprocal frequency conversion and amplification. In this work we demonstrate four modes of operation: frequency conversion (

G-band frequency-scanned antenna arrays

-0.5~\mathrm{dB}

G-Band Micro-Fabricated Frequency-Steered Arrays With 2

transmission,

^\circ

-30~\mathrm{dB}

/GHz Beam Steering

reflection), circulation (

A geometric description of nonreciprocity in coupled two-mode systems

-0.5~\mathrm{dB}

W-Band Micro-Fabricated Coaxially-Fed Frequency Scanned Slot Arrays

transmission,

Microfabricated transmission-line transformers with DC isolation

-30~\mathrm{dB}

G-band frequency-steering antenna array design and measurements

reflection,