Printed Aperiodic Cavity for Computational and Microwave Imaging

• Published in: IEEE microwave and wireless components letters Vol. 26; no. 5; pp. 367 - 369
• Main Authors: Yurduseven, Okan, Gowda, Vinay R., Gollub, Jonah N., Smith, David R.
• Format: Journal Article
• Language: English
• Published: IEEE 01.05.2016
• Subjects: Apertures; Arrays; Boards; Cavity resonators; Computation; Computational imaging; Fibonacci; Frequency measurement; Holes; Imaging; microwave cavity; Microwave imaging; Microwaves; printed cavity; Printed circuits; Q-factor; Radar imaging; microwave cavity; microwave imaging; Fibonacci; Computational imaging; printed cavity
• ISSN: 1531-1309; 1558-1764
• DOI: 10.1109/LMWC.2016.2548443

We demonstrate a frequency-diverse aperture for microwave imaging based on a planar cavity at K-band frequencies (18-26.5 GHz). The structure consists of an array of radiating circular irises patterned into the front surface of a double-sided printed circuit board. The irises are distributed in a Fibonacci pattern to maximize spatial diversity at the scene. The printed cavity is a phase-diverse system and encodes imaged scene information onto a set of frequencies that span the K-band. Similar to recently reported metamaterial apertures, the printed cavity imager does not require any mechanically moving parts or complex phase shifting networks. Imaging of a number of targets is shown; these reconstructed images demonstrate the ability of the system to perform imaging at the diffraction limit. The proposed printed cavity imager possesses a relatively large quality factor that can be traded off to achieve higher radiation efficiency. The general mode characteristics of the printed cavity suggest advantages when used in computational imaging scenarios.