| 摘要 |
A frequency selective surface filter 20 (or 50, Fig 1) particularly useful in connection with a transmit antenna (10, Fig 1) for passing and rejecting signals in multiple frequency bands. According to one embodiment, the frequency selective surface filter 20 has a single-conductive screen (24, Fig 2) disposed on a dielectric medium (22, Fig 2). The single-conductive screen (24) includes an array of parallel intersecting lines 26 and 28 providing low frequency filtering. The single-conductive screen (24) also includes an array of double-loop conductive elements each made up of an inner conductive loop 32 and an outer conductive loop 30. According to a second embodiment, the frequency selective surface filter (50, Fig 1) contains two dielectrically separated conductive layers including a first conductive layer (52, Fig 5) having an array of double-slots made up of an inner slot (64, Fig 6) and an outer slot (66, Fig 6). The double-layer configuration further includes a second conductive layer (60, Fig 5) made up of an array of single conductive loops (62, Fiq 7).
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