Phaseless measurements of antenna near fields from infrared images using holographic phase retrieval

John E. Will; John D. Norgard; Michael F. Seifert

doi:10.1117/12.271651

4 April 1997 Phaseless measurements of antenna near fields from infrared images using holographic phase retrieval

John E. Will, John D. Norgard, Michael F. Seifert

Author Affiliations +

Proceedings Volume 3056, Thermosense XIX: An International Conference on Thermal Sensing and Imaging Diagnostic Applications; (1997) https://doi.org/10.1117/12.271651
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

Complex (magnitude and phase) measurements of the near field of a radiating antenna over a known surface (usually a plane, cylinder, or sphere) can be used to determine its far-field radiation pattern using near-field to far-field Fourier transformations. Standard gain horn antennas or open-ended waveguide are often used to probe the near field. This requires the time-consuming positioning of the probe antenna to several thousand positions in the radiating near field of the antenna under test. Experimental errors are introduced into the near-field measurements by mechanical probe position inaccuracies and electrical probe interactions with the antenna under test and probe correction errors. A minimally perturbing infrared (IR) imaging technique can also be used to map the near fields of the antenna. This measurement technique is much simpler and easier to use than the probe method and eliminates probe position errors and probe correction errors. Current IR imaging techniques, which have been successfully used to rapidly map the relative magnitude of a radiating field at many locations (mXn camera pixels per image captured) over a surface, however, suffer from an inability to determine phase information. This paper describes a method for determining the absolute magnitude and relative phase data from these phaseless IR measurements by using techniques derived from optical holography. Form a pair of microwave holograms and magnitude only measurements, the complete near field (magnitude and phase) of the antenna can be determined. Once obtained, this data can then be used to determine the antenna far field pattern by conventional Fourier near-field to far-field transformation techniques.

Citation Download Citation

John E. Will, John D. Norgard, and Michael F. Seifert "Phaseless measurements of antenna near fields from infrared images using holographic phase retrieval", Proc. SPIE 3056, Thermosense XIX: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (4 April 1997); https://doi.org/10.1117/12.271651

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Antennas

Holograms

Near field

Holography

Infrared imaging

Phase measurement

Near field optics

Show All Keywords

Keywords/Phrases

Search In:

Publication Years