Abstract: An apparatus is disclosed for N-plexer filtering for coupled antennas. In example implementations, an apparatus includes a first antenna, a second antenna, a first receiver unit tuned to a first frequency band, and a second receiver unit tuned to a second frequency band. The apparatus also includes multiple antenna feed lines. A first antenna feed line is coupled between the first antenna and the first receiver unit. A second antenna feed line is coupled between the second antenna and the second receiver unit. The second antenna feed line comprises an N-plexer that includes multiple paths. A first path is coupled to the second antenna. A second path is coupled to the second receiver unit and includes a resonator configured to cause the first frequency band to be reflected.

Abstract: An apparatus is disclosed for N-plexer filtering for coupled antennas. In example implementations, an apparatus includes a first antenna, a second antenna, a first receiver unit tuned to a first frequency band, and a second receiver unit tuned to a second frequency band. The apparatus also includes multiple antenna feed lines. A first antenna feed line is coupled between the first antenna and the first receiver unit. A second antenna feed line is coupled between the second antenna and the second receiver unit. The second antenna feed line comprises an N-plexer that includes multiple paths. A first path is coupled to the second antenna. A second path is coupled to the second receiver unit and includes a resonator configured to cause the first frequency band to be reflected.

Abstract: An apparatus includes a radio-frequency (RF) path that includes an antenna tuner. The apparatus also includes calibration circuitry coupled to the antenna tuner. The calibration circuitry is configured to selectively isolate an antenna from a component of the RF path.

Abstract: An apparatus includes a radio-frequency (RF) path that includes an antenna tuner. The apparatus also includes calibration circuitry coupled to the antenna tuner. The calibration circuitry is configured to selectively isolate an antenna from a component of the RF path.

Abstract: A planar antenna assembly comprises a Planar Inverted F Antenna mounted on a printed circuit board (PP) and comprising i) a radiating element (RE1, RE2) comprising first (RE1) and second (RE2) parts approximately perpendicular one to the other and being respectively located in a first plan facing and parallel to a ground plane mounted on a face of the printed circuit board (PP) and in a second plane perpendicular to said ground plane, ii) a feed tab (FT) extending from said second part (RE2) to said printed circuit board (PP), and iii) a main slot (SO1) having a chosen length and comprising a linear part (LP) defined in the second part (RE2) at a chosen location between lateral sides of the radiating element (RE1, RE2) and a meandered part (MP) extending the linear part (LP) into the first part (RE1).

Abstract: The invention relates to an antenna diversity comprising a first and a second antenna element where the first antenna element is operated in an active mode whereas the second antenna element is operated in a parasitic mode. The present invention minimizes the amount of mismatch while still being able to maximize a predetermined signal quality criterion for the electromagnetic signal on the active path between the first antenna element and the transceiver. By providing a pre-selection unit 130 as well as a selection unit 140 for selecting an optimal adjustable impedance connected to the second antenna ensuring that the amount of said mismatch is below a predetermined threshold value and that simultaneously a predetermined quality criterion for the transceived electromagnetic signal is fulfilled best within the range determined by the allowable mismatch. The invention further relates to a method for operating such an antenna diversity.