Microwave Resonant Switched-Slot Probe with Perpendicular Coaxial Feed


Development of efficient microwave real-time imaging systems is of great interest for many applications. A cost-effective design of such systems utilizes a switched transmit-receive array composed of efficient antenna elements. The utilized imaging arrays are typically planner and consist of large number of closely-spaced elements. The performance of these systems depends largely on the efficiency of the array element and its feeding structure, isolation between the elements as well as the transmit-receive isolation. Implementing the required efficient feeding and high-isolation switching, in-plane with the elements of a compact array is rather challenging at high microwave frequencies, e.g., 24 GHz. In this paper, a resonant switched slot with an out-of-plane coaxial feed is introduced as an efficient element for microwave imaging arrays. The slot is loaded with a PIN Diode and hence it is switched directly. The proposed array element design involves coupling the transmitted/received signals into/from the slot using a coaxial feed perpendicular to the plane of the slot. Two design variations of this out-of-plane feeding structure are considered here, namely; electrical and magnetic coupling. Simulation and measurement results show that high radiation and switching isolation can be obtained with these feed designs.

Meeting Name

IEEE International Instrumentation and Measurement Technology Conference (2010: May 3-6, Austin, TX)


Electrical and Computer Engineering

Keywords and Phrases

Imaging; Microwave; Perpendicular Coaxial Feed; PIN Diode; Resonant Slot; Sensing; Design; Feeding; Imaging Systems; Instruments; Magnetic Couplings; Measurement Theory; Real Time Systems; Semiconductor Diodes

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version


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© 2010 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 May 2010