It has been reported that a left-handed waveguide can be constituted using cutoff TE10 mode of rectangular waveguide. Because the cutoff TE10 mode shows effectively negative permittivity, the left-handed mode propagates by adding series capacitance in the form of short- or open-stubs. This paper suggests a constitution method of left-handed waveguides using cutoff TM mode. In this case, the cutoff TM mode shows effectively negative permeability. Therefore, a left-handed waveguide can be constituted by adding parallel inductance. In this paper, two types of the left-handed waveguides are designed using circular TM01 mode and rectangular TM11 mode, and the dispersion characteristics are numerically investigated. The validity of the constituting principle is confirmed by an experiment.

At high signal frequencies (i.e. in the GHz range), a connector must be considered as part of an electromagnetic transmission line. At these frequencies, the impedance characteristics of the connector stemming from the distributed inductance and capacitance of pins and the associated wiring, must be carefully controlled; insertion losses must be minimized and undesirable coupling between non-neighboring pins giving rise to crosstalk must be avoided to achieve optimal signal transmission. This paper reviews fundamental issues associated with the performance optimization of multi-conductor connector structures for high speed signal transmission. The paper complements an earlier publication that reviewed the major factors affecting electrical contact resistance at high frequencies [1].

This paper presents an imaging technique using the MUSIC algorithm to localize cylindrical reflectors in cross-borehole radar arrangements. Tomographic measurement, in which a transmitting and a receiving antenna are individually moved in separate boreholes, can be considered as a combination of a transmitting and a receiving array. A decorrelation technique with the transmitting array, which has been proposed for imaging point reflectors, is applied for imaging cylindrical reflectors using the MUSIC algorithm. Simulated and experimental results are shown to verify the validity of this algorithm for cylindrical targets. We analyze the evaluation error caused by the increase in the radius of the cylinder.