Abstract:
A phased array has a laminar substrate, a plurality of elements on the laminar substrate forming a patch phased array, and first and second sets of integrated circuits on the laminar substrate. The first set of integrated circuits, each of which are single polarity integrated circuits, connects with a first set of the plurality of elements, and are configured to operate using first signals having a first polarity. In a similar manner, each one of the second set of integrated circuits also is a single polarity integrated circuit and connects with a second set of the plurality of elements. Also, each of the second set of integrated circuits is configured to operate using second signals having a second polarity. The first polarity is substantially orthogonal to the second polarity (i.e., to not interfere with each other).
Abstract:
There is disclosed a reconfigurable, leaky-wave antenna device comprising: a groundplane; a septum extending substantially perpendicularly from the groundplane and extending along a length thereof; a first main microstrip transmission line having first and second opposed lengthwise edges, the first edge connected to the septum, the first main microstrip transmission line extending substantially parallel to and above the groundplane to one side of the septum; and a first subsidiary microstrip transmission line, arranged alongside the second edge of the first main microstrip transmission line. The first main and first subsidiary microstrip transmission lines are connected to each other at a plurality of points along their respective lengths by reconfigurable electronic components.
Abstract:
A communication system (10B) comprises a signal generator (112), polarizer (102), signal combiner (123), transmitter (105), positioning device (120A), and controller (50A). The signal generator (112) converts first and second received data streams (113A, 113B) into respective first and second orthogonal linearly polarized signals (118A, 118B). The polarizer (102) is at a first rotation angle and converts first and second orthogonal linearly polarized signals (118A, 118B) into, respectively, a first right-hand-circularly polarized (RHCP) signal (122A) and first left-hand circularly polarized (LHCP) signal (122B), which are combined in signal combiner (123A) into a signal sent by transmitter (106) to a receiver (108). The positioning device (120A) adjusts the first rotation angle to substantially increase isolation between third and fourth orthogonal linearly polarized signals (124A, 124B) at the receiver (108). The controller (50A) performs the real-time analysis of transmission loss and directs the positioning device (120A) to adjust the first rotation angle.
Abstract:
Aspects of the present disclosure are directed to rule based switchable polarization techniques. In one aspect, a device may receive one or more RF signals. A packet error rate associated with the received one or more RF signals may be determined. A polarization switching circuit may determine if the measured PER is greater than a predetermined threshold PER. In response to the determination that the PER is greater than the predetermined threshold PER, the polarization switching circuit may change a polarization of the device.
Abstract:
An Adaptive Polarization Array (APA) Algorithm is described for adjusting the polarization orientation of antennas, such as Dual-polarized array antennas. The APA Algorithm searches to find a polarization state that maximizes a signal quality of a received signal in the presence of interfering signals and noise. The search facilitates adjustment of a polarization state of, for example, receive antennas to maximize a signal quality metric. A proxy metric having no local maxima other than the global maximum is used to search the polarization search domain to find a best polarization state.
Abstract:
A multi-beam, polarization diversity, narrow-band cognitive antenna system is disclosed. The antenna system includes a plurality of antenna elements, switching elements, and transmission feed lines disposed on a PCB substrate, inside or on the enclosure of a consumer wireless device, on the airframe of an air vehicle, or on the surface of a ground vehicle. The plurality of switching elements are arranged with the antenna elements and transmission feed lines to, when selectively closed, electrically couple selected ones of th antenna elements and transmission feed lines to one another to generate an antenna configuration selected from a plurality of antenna configurations. A non-volatile memory is configured to store data representing at least some of the plurality of antenna configurations. control arrangement operatively coupled to the plurality of switching elements and configured to close selected ones of the switching elements as a function of the data stored in said memory.
Abstract:
An RFID antenna comprising an elongated structure existing along an axis that is long compared to the signal wavelength and including twin ribbon-like feed lines of electrically conductive material, the feed lines being in a common plane and being uniformly laterally spaced from one another, and a plurality of radiating perturbations associated with the feed lines at a plurality of locations spaced along the feed lines, at each location each feed line has its own individual perturbation or portion of a perturbation.
Abstract:
Embodiments of the invention pertain to Radio Frequency Identification (RFID) method and system using an antenna array, an array controller, and control algorithms. Embodiments of the invention can induce strong radio-frequency (RF) excitation, for a given level of radiated RF power, at any point within an arbitrary inhomogeneous medium. For RFID applications, one typical inhomogeneous medium is an ensemble of cases on a pallet. Another typical medium is a warehouse environment having stored goods together with shelving and other material present. An embodiment of the invention is applicable to the process of reading battery-less, or 'passive' RFID tags, which rely on incident RF electromagnetic fields established by RFID readers to power the electronic circuitry within the tags.