• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.11
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• pp.2260-2266
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• 2009

In this paper, the problem of electromagnetic coupling between a slit fed by a flanged parallel-plate waveguide (FPPW) and a nearby conducting strip parallel to the slit is studied as a simplified problem for a near-field scanning microscopy (NSM). The characteristics of the FPPW are investigated from the results for the variations of the equivalent slit admittance, the reactive powers near the slit inside and outside the FPPW, the magnitude and phase of the voltage reflection coefficient of the TEM wave. The performance of the proposed apparatus as an NSM is tested by examining the effects of various geometrical parameters such as guide height, slit width, strip width, distance between slit and strip, and the ratio of slit width to guide height on the magnitude and phase of the voltage reflection coefficient of the TEM wave. From the results for the voltage reflection coefficient against the strip offset from the slit, it is found that a slit in the FPPW with smaller guide height gives higher scanning resolution and the phase variation is more sensitive than the magnitude variation.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.11
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• pp.1116-1122
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• 2004

The problem of electromagnetic coupling through a slit in a flanged parallel-plate waveguide is considered. The equivalent slit admittance associated with reactive powers near the coupling slit inside and outside the waveguide has been obtained. The maximum coupling mechanism for the case of narrow slit has been quantitatively discussed. The effects of various geometrical parameters such as guide height, slit width, and slit of offset on the radiation characteristics of the geometry have been investigated.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.6 s.109
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• pp.501-510
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• 2006

In this paper, the electromagnetic coupling through a slit in a flanged parallel-plate waveguide with a conducting strip is studied. The coupled integro-differential equations for the electric field over the slit and the induced current over the strip are derived and solved by use of the method of moments. The characteristics of some types of maximum coupling phenomena are investigated from the examinations of the variations of the equivalent slit admittance and the coupled power against various parameters such as the location of conducting strip, operating frequency, and strip length.