Abstract: There is described herein a low profile dipole antenna element. A pair of these elements can be arranged in a crossed manner to provide two orthogonal polarized radiators. The antenna element may be combined with an electrically conductive surface and a feed cable and connected to a feed source.

Abstract: There is described herein a low profile dipole antenna element. A pair of these elements can be arranged in a crossed manner to provide two orthogonal polarized radiators. The antenna element may be combined with an electrically conductive surface and a feed cable and connected to a feed source.

Abstract: A low profile wideband multi-beam integrated dual polarization antenna array with compensated mutual coupling effect. Instead of suppressing mutual coupling with post-element-design techniques by attempting to block the reflections between elements, an element of the array is designed using its active impedance, i.e. its impedance with mutual coupling once the element is part of the array. The active impedance is determined using various simulation techniques and the element is then designed such that its impedance is shifted in order to modify its active impedance. This technique does not reduce the mutual coupling itself but instead, compensates for the mutual coupling effect and improves the return loss of the element.

Abstract: A base station comprising an arrangement of several directional antennas whose individual azimuthal beam patterns achieve substantially omnidirectional coverage is disclosed. The invention is particularly suitable to telecommunications networks in an initial developmental stage, or to networks deployed in rural areas, both scenarios requiring a low-capacity high-range omnidirectional coverage area. The antennas are generally less conspicuous than a purely omnidirectional antenna achieving the same range, and preferably possess horizontal and vertical polarization ports. In its simplest form, the invention provides a single base station transceiver connected simultaneously to the horizontal polarization port of each antenna. Phase shifters may be inserted in the transmit path for cancellation of nulls in the interference pattern resulting from connection the transceiver to more than one antenna at a time. As capacity demand increases, further transceivers can be added without change to the antenna arrangement.

Abstract: A base station antenna arrangement comprising a plurality of antenna arrays each capable of forming a multiplicity of separate overlapping narrow beams in azimuth, the arrays being positioned such that the totality of beams formed by the arrays provides a substantially omni-directional coverage in azimuth, azimuth and elevation beamforming means for each array, a plurality of r.f. transceivers each for transmitting and receiving r.f. signals for one or more calls, switching matrix means for connecting each transceiver with one or other of the arrays via the beamforming means, control means for controlling the switching matrix means whereby a particular transceiver is connected to a particular array via the beamforming means to exchange r.f. signals with a remote station located in the area covered by one of the narrow beams.

Abstract: A dual mode transceiver architecture suitable for adaptation in either a handset or a base station and capable of operating in both Frequency Division Duplex (FDD) mode or in Time Division Duplexing (TDD) mode is disclosed. Such a transceiver has an up conversion path capable of up converting an Intermediate Frequency (IF) to a Radio Frequency (RF) signal in either an upper band frequency range or a lower band frequency range. Also the transceiver has a down conversion path, used for receiving, for down converting a RF signal in either the upper band or lower band to a desirable IF frequency. The transceiver includes a switch array capable of switching the up conversion path to either the upper band port or the lower band port of a diplexer and the switch array also switches the upper band port and lower band port of the diplexer to the down conversion path depending on whether the transceiver is operating in TDD mode or FDD mode.

Abstract: An antenna for a base station comprising a plurality of antenna arrays (40; FIG. 6a) each capable of forming a multiplicity of separate overlapping narrow beams in azimuth, the arrays being positioned such that the beams formed by the arrays provide a coverage in azimuth wider than each array. Means for receiving r.f. signals for a given call include a plurality of receive amplifiers (62; FIG. 6a) one for each beam of an antenna array, means for combining the outputs of the plurality of receive amplifiers, switching means for applying the combined receive signals to the r.f. transceiver handling the given call; and a single power amplifier (52; FIG. 6a) for transmitting r.f. signals for the given call for applying the transceiver transmit signal to an individual one of the beams.

Abstract: An antenna for a base station comprising a plurality of antenna arrays (40; FIG. 6a) each capable of forming a multiplicity of separate overlapping narrow beams in azimuth, the arrays being positioned such that the beams formed by the arrays provide a coverage in azimuth wider than each array. Means are provided for splitting (58; FIGS. 14b,14c) the transmission output of a given transceiver into two signals prior to transmission power amplification and transmitting said signals in two adjacent narrow overlapping beams.