摘要:
A device includes a phase shifting element array comprising a plurality of metamaterial structures that resonate in response to an input electromagnetic (EM) signal. The phase shifting element array generates an output EM signal that is a sum of component output electromagnetic signals generated respectively by the metamaterial structures and is configured to propagate wirelessly through at least a portion of a patient's body. A control circuit controls one or both of phases and amplitudes of the component electromagnetic output signals so that at least one of constructive and destructive interference between the component output electromagnetic signals causes the output signal to have a higher intensity EM radiation at a target region interior to the body and to have a zero or low intensity radiation at a non-target region interior to the body. The device is configured to produce the higher intensity electromagnetic radiation suitable for hyperthermia therapy at the target region.
摘要:
An antenna apparatus for use in a wireless network and method of operating such an antenna apparatus are provided. The antenna apparatus has omnidirectional antenna elements and RF chains, where there are fewer RF chains than omnidirectional antenna elements. A subset of the omnidirectional antenna elements are coupled to the RF chains and sampling circuitry coupled to the RF chains samples the signals received by the subset of the omnidirectional antenna elements. This forms part of a signal detection process in which different subsets of the omnidirectional antenna elements are iteratively coupled to the RF chains. A signal sample spatial covariance matrix for the omnidirectional antenna elements is constructed from the signals sampled by the sampling circuitry at each iteration and a beamforming algorithm applied to the signal sample spatial covariance matrix parameterizes the signals received by the omnidirectional antenna elements.
摘要:
An antenna apparatus operates as a base station in a wireless network with spatial nulling performed within such apparatus. The apparatus has an antenna assembly employing a selected reception beam pattern. During a nulling test, a reception beam pattern controller causes the assembly to employ each reception beam pattern. Quality metric determination circuitry determines for each reception beam pattern a link quality metric for each of several wireless terminals, based on communication between those wireless terminals and the base station while the assembly employs that reception beam pattern. Reception beam determination circuitry determines, from the various link quality metrics, a reception beam pattern from the reception beam patterns for use for subsequent communication with the wireless terminals. A reception beam pattern can be altered seeking to reduce interference source effects and to maintain an appropriate level of link quality regarding each wireless terminal communicating with the base station.
摘要:
Antenna apparatus and a method of operating the antenna apparatus are provided. The antenna apparatus comprises a directional antenna comprising antenna array components, RF chains connected to the antenna array components, and a transceiver connected to the RF chains. Each RF chain comprises in sequence: a switching stage having switching circuitry selectively to connect an antenna array component, a phase shifting stage having phase shifting circuitry, and a summation stage having summation circuitry, wherein at least two of the RF chains share phase shifting circuitry and at least two of the RF chains share summation circuitry. The at least partial sharing of the RF chains, an in particular of the phase shifting circuitry provides a compact and cheap antenna apparatus, which is nonetheless capable of degree of configurability in direction and beam pattern to enable it to operate in a busy and changing environment.
摘要:
A beam signal tracking method, device, and system. The method includes: obtaining a Doppler frequency shift of a receive-beam signal, and determining a Doppler frequency shift change speed of the receive-beam signal according to the Doppler frequency shift (S10); determining a scanning speed and a scanning angle step size of the receive-beam signal according to the Doppler frequency shift change speed (S20); scanning the receive-beam signal according to the scanning speed and the scanning angle step size, and determining a beam angle that is formed when the receive-beam signal is aligned with a transmit-beam signal (S30); determining phase configuration information of a phase shifter according to the beam angle that is formed when the receive-beam signal is aligned with the transmit-beam signal (S40); and configuring the phase shifter according to the phase configuration information of the phase shifter, so that the receive-beam signal is aligned with the transmit-beam signal (S50).
摘要:
Cellular array implementations with multiple steerable spotlight beams irradiated from a common aperture are disclosed herein. Such an approach can easily be adapted to suit various geographical population densities and distributions. The array is capable of producing multiple 65-degree cellular coverage beams, which may be used for regular coverage or in MIMO (Multiple Input Multiple Output) mode. The array may also produce multiple steerable beams, or “spotlight” beams. These beams may be relatively narrow and may be steered electronically both in azimuth and elevation directions. By steering the beams in this way, the beams are able to provide cellular services at high-demand “hotspot” regions where high capacity service is required. The spotlight beams may also be used to fill voids or deficiencies caused by regular coverage beams.
摘要:
A phase shifter and a method of making a phase shifter are disclosed herein. The phase shifter may include a housing, a dielectric, an electrode, and a liquid crystal layer. The housing includes first, second, third, and fourth conductive walls, each conductive wall being opposite one of the other walls. The dielectric is situated within the housing and defines a compartment within the housing. The electrode is aligned with the compartment. The liquid crystal layer fills the space of the compartment. A bias line is coupled to the electrode. The phase shifter may be integrated with as substrate integrated waveguide.