Kabushiki Kaisha Toshiba

Micrima Limited

Ian James Craddock

Ralph Benjamin

Sema Dumanli Oktar

David Rhys Gibbins

Maciej Bartlomiej Klemm

David Rhys Gibbons

In an embodiment, an antenna is disclosed. The antenna comprises: a substrate of dielectric material, the substrate being substantially planar and defining a first surface and a second surface opposed to the first surface; an electrically conductive ground plane on the first surface, the ground plane defining a slot; a first feed line configured to receive a first input signal having a frequency within an operating frequency range, the first feed line extending over the slot on the second surface in a first direction by a length of between 0.3 and 0.4 wavelengths of a signal in the operating frequency range and terminating over the slot, the first feed line being offset from a central axis of the slot running in the first direction; a second feed line configured to receive a second input signal having a frequency within the operating frequency range, the second feed line extending on the second surface in a second direction, the second direction being orthogonal to the first direction, the second feed line terminating over the slot at least a distance of 0.1 wavelengths of a signal in the operating frequency range from the first feed line such that the first and second feed lines do not intersect, the second feed line extending substantially perpendicularly from a location on an edge of the slot between 0.4 and 0.6 of the extent of that edge.

Antenna

A method of measuring the contents of a search volume. The method includes: energizing one or more transmitters so as to transmit electromagnetic wave energy into the search volume; detecting the effect of the search volume on the passage of the electromagnetic wave energy by recording two or more signals, each signal being associated with a different propagation path (typically either a monostatic or bistatic path) within the search volume; aligning the signals in order to generate two or more aligned signals which are synthetically focused on a desired voxel in the search volume, each aligned signal being associated with a different propagation path (typically either a monostatic or bistatic path) within the search volume; calculating a quality factor by processing the aligned signals to generate two or more data values, and processing the data values to generate a quality factor, the quality factor being indicative of a degree of coherence in the aligned signals; summing the aligned signals to generate a summed signal; and processing the summed signal to generate an output which is indicative of the internal structure of the search volume at the location of the desired voxel, the output varying in accordance with the quality factor.

Methods and apparatus for measuring the contents of a search volume

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Bristol, United Kingdom

Ian James Craddock