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A Resonant Slit-Type Probe for Millimeter-Wave Scanning Near-Field Microscopy

Tatsuo NOZOKIDO, Tomohiro OHBAYASHI, Jongsuck BAE, Koji MIZUNO

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Summary :

A resonant slit-type probe is proposed in this paper that can improve measurement sensitivity in millimeter-wave scanning near-field microscopy. The probe consists of a rectangular metal waveguide incorporating the following three sections; a straight section at the tip of the probe whose height is much smaller than the operating wavelength; a standard-height waveguide section; a quarter-wave transformer section to achieve impedance-matching between the other sections. The design procedure used for the probe is presented in detail and the performance of the fabricated resonant probe is evaluated experimentally. Experiments performed at U-band frequencies in which we reconstruct 2D images show that the sensitivity of the resonant probe is improved by more than four times compared with a conventional tapered slit-type probe. Some experimental results are compared with those obtained using the finite element method (Ansoft HFSS). Good agreement is demonstrated.

Publication
IEICE TRANSACTIONS on Electronics Vol.E87-C No.12 pp.2158-2163
Publication Date
2004/12/01
Publicized
Online ISSN
DOI
Type of Manuscript
PAPER
Category
Microwaves, Millimeter-Waves

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