Ultra-wideband dual-band cellular basestation antenna

摘要

Ultra-wideband dual-band cellular dual-polarization base-station antennas and low-band radiators for such antennas are disclosed. The low-band radiator comprises a dipole and an extended dipole con figured in a crossed arrangement, a capacitively coupled feed connecting the extended dipole to an antenna feed, and a pair of auxiliary radiating elements. The dipole comprises two dipole arms, each of approximately λ/4, for connection to the antenna feed. The extended dipole has anti-resonant dipole arms of approximately λ/2. The auxiliary radiating elements are configured in parallel at opposite ends of the extended dipole. The radiator is adapted for the frequency range of 698-960 MHz and provides a horizontal beamwidth of approximately 65 degrees. The dual-band base-station antenna comprises high-band radiators configured in at least one array and low-band radiators interspersed amongst the high-band radiators at regular intervals.

主权项

1. A low-band radiator of an ultra-wideband dual-band dual-polarisation cellular base-station antenna, said dual bands comprising low and high bands, said low-band radiator comprising:
a dipole comprising two dipole arms, each dipole arm resonant at approximately a quarter-wavelength, adapted for connection to an antenna feed; an extended dipole with anti-resonant dipole arms, each anti-resonant dipole arm of approximately a half-wavelength, said dipole and extended dipole being configured in a crossed arrangement; a capacitively coupled feed connected to said extended dipole for coupling said extended dipole to said antenna feed; and a pair of auxiliary radiating elements, configured in parallel to the dipole arms and substantially centered at opposite ends of said extended dipole, wherein said dipole and said pair of auxiliary radiating elements together produce a desired narrower beamwidth and wherein the low-band radiator provides dual orthogonal polarisation.