A method for tuning an antenna system having a parasitic element coupled to a variable reactance element is provided. The method can include determining a plurality of reactance values in a span of reactance values for which a variable reactance element is configurable. The parasitic element can be configured to implement an operation mode of a null steering antenna in a selected mode defined by a selected reactance value within the span of reactance values. The method can include sampling a plurality of sampled channel quality indicators at each of the plurality of reactance values. The method can include determining a subset of the span of reactance values, the subset of the span including a reactance value having an increased sampled channel quality indicator. The method can include selecting one of the subset of the plurality of reactance values to tune the null steering antenna in the selected mode.

The present disclosure describes methods, devices, systems, and procedures for detecting a proximity of an object (301) in a near-field region of an electromagnetic field of a transmitting antenna array (204; 304; 404) using a voltage standing wave ratio (VSWR). In aspects, a forward signal for transmission by the antenna elements (308) is generated, at least one VSWR detector (210; 310) coupled to the antenna array (204; 304; 404) measures a power of the forward signal, the forward signal is transmitted, the at least one VSWR detector (210; 310) measures a power of a reflected signal, and the VSWR detector (210; 310) calculates a VSWR. Detected changes in the calculated VSWR are then utilized to detect object (301) proximity in the near-field region. Beamforming weights may be applied to the forward signal and a machine-learned model can be utilized to detect object (301) proximity in the near-field region.

A method and apparatus are provided for nulling a radio frequency (RF) beam for a high-altitude platform (HAP). A transmitter generates an RF signal. A primary antenna system generates an RF beam based on the RF signal. One or more processors determine a result indicating whether to modify the RF beam. When the result indicates to modify the RF beam, a detachable nulling subassembly generates nulling signals based on the RF signal to modify the RF beam generated by the primary antenna system.

In accordance with some embodiments, an apparatus, comprising at least one processor and at least one memory including computer program code. The at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to transmit at least one data packet according to a link budget. The apparatus may further adjust at least one antenna beam steering angle in 3-dimensions according to an optimum dither angle or plurality of dither angles. The apparatus may further adjust at least one antenna pattern according to a predetermined tilt.

This application discloses a correction and testing system, comprising a first phased array, a second phased array, and a test instrument, wherein the first phased array comprises a first radio frequency RF channel, the test instrument is configured to: determine, based on a coupling signal, an amplitude deviation value and a phase deviation value that correspond to the first RF channel; if the amplitude deviation value and the phase deviation value satisfy a preset error correction condition, correct an amplitude coefficient and a phase coefficient that correspond to the first RF channel to obtain a target amplitude coefficient and a target phase coefficient; and measure performance indicator parameters of the first phased array by using the target amplitude coefficient and the target phase coefficient. The correction and testing system can improve test efficiency, reducing a floor area, and lowering costs.

A technique is described where the switch and/or tunable control circuit for use with an active multi-mode antenna is positioned remote from the antenna structure itself for integration into host communication systems. Electrical delay and impedance characteristics are compensated for in the design and configuration of transmission lines or parasitic elements as the active multi-mode antenna structure is positioned in optimal locations such that significant electrical delay is introduced between the RF front-end circuit and multi-mode antenna. This technique can be implemented in designs where it is convenient to locate switches in a front-end module (FEM) and the FEM is located in vicinity to the transceiver.

An electronically steerable antenna includes an embedded antenna processor and orientation sensor, separate from any orientation sensor within a corresponding GPS receiver. The orientation sensor tracks orientation changes in the mobile platform including the electronically steerable antenna, and an antenna processor updates beams and nulls produced by the antenna to track a real-world location based on the orientation changes. The embedded antenna processor periodically compares the orientation data from the embedded orientation sensor with orientation data from systems aboard the mobile platform to calibrate.

The system and method of global positioning system (GPS) anti-jam (AJ) AJ antennas utilizing a circular array of patch antennas. In some cases the circular array is conformal. The elements are single patch, dual band (L1/L2) and are linearly polarized. A mode former and progressive phase tapers are used.

This document describes an integrated cellular and ultra-wideband antenna system for a mobile electronic device. The cellular and ultra-wideband antenna are located in close proximity to one another, along with a circuit designed to enhance isolation between the two antennas. The circuit is also designed to enhance the efficiency of the cellular antenna by permitting the ultra-wideband antenna to generate an additional resonance in the cellular band. The integrated cellular antenna and ultra-wideband antenna results in reduced mutual coupling and performance degradation of the antennas, and the cellular antenna may gain enhanced bandwidth and efficiency.

In one example embodiment, a magnetic shutter antenna is provided including at least one dipole magnet comprising a first end and a second end and at least one shutter of magnetically soft material comprising at least one opening and disposed proximate the first end of the at least one dipole magnet. The antenna further includes a motor coupled to the shutter and configured to move the shutter between a first closed position comprising the magnetic material being positioned adjacent the first end of the dipole magnet and a second open configuration comprising the opening being positioned adjacent the first end of the dipole magnet. Alternation between the first closed position and the second open position modulates a magnetic flux emitting from the first end of the at least one dipole magnet.