| 摘要 |
A method is described for selecting an electromagnetic radiation (EMR) frequency causing substantially uniform heating in cylindrical biological tissue specimens, having a typical cross-sectional dimension, d, and known electrical properties, by an annular applicator configured for applicator-specimen impedence matching. Accordingly, an annular applicator system (10) comprises an EMR source (32) having a selected frequency wavelength in a specimen (20) between two-thirds and twice the specimen dimension, d. Connected to the source (32) is an annular applicator apparatus (12) formed of four applicator segments (16), circumferentially arranged to form an axial specimen receiving opening (18). A composite EMR emitting aperture (22), formed around the opening (18) has an axial height to circumferential width ratio causing matching, at the selected frequency, between a characteristic impedance of the apparatus (12) and a load impedance of the specimen (20) as seen through the aperture. A line splitter (36) enables parallel EMR connection of the segments (16) to the source (32). Two variation annular apparatus (200) and (252) are described.
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