THREE-DIMENTIONAL OMNI-DIRECTIONAL ANTENNA DESIGNS FOR ULTRA-WIDEBAND APPLICATIONS

摘要

The present invention generally relates to the field of microwave antennas, and, more particularly, to a number of three-dimensional designs (300a-l) for the radiation element (202) of an ultra-wideband monopole antenna (100) with a symmetrical omni-directional radiation pattern operated in the frequency range between 3.1 GHz and 10.6 GHz. Said 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 requirements in terms of antenna gain, radiation pattern, polarization, frequency bandwidth, group delay, and size. It comprises a radiation element (202) consisting of an air- and/or dielectric-filled 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 (205), serves as a reflector. The monopole antenna (100) further comprises an antenna feeding circuitry (211) used for electronically steering the symmetrical omni-directional radiation pattern and a feeding line (202b) connecting the antenna feeding circuitry (211) with the base plane (202a') of the radiation element (202). Thereby, parts of the analog front-end circuitry can optionally be placed within the air-filled part of the radiation element (202) of the antenna (100). IMAGE