| 摘要 |
PROBLEM TO BE SOLVED: To provide, generally in relation to the field of microwave antennas, and, more particularly, a number of three-dimensional designs for a radiation element of an ultra-wideband monopole antenna with a symmetrical omni-directional radiation pattern operated in the frequency range between 3.1 GHz and 10.6 GHz particularly with regard to a field of a microwave antenna generally. SOLUTION: An antenna (100) is connected to the analog front-end circuitry of a wireless communication device used for transmitting and/or receiving microwave signals and meets the FCC (Federal Communication Commission) requirements in terms of antenna gain, radiation pattern, polarization, frequency bandwidth, group delay, and size. The antenna comprises a radiation element (202) consisting of an air- and/or dielectric-field cavity structure with a base plane (202a') and a radiator plane (202b'). A metallic ground plane (204) having a relatively high surface impedance to electromagnetic waves within said frequency range, which is printed on a dielectric substrate, serves as a reflector. COPYRIGHT: (C)2005,JPO&NCIPI
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