A multi-resonant, electrically-small antenna having a first helical arm and a second helical arm. The first helical arm encircles a first central axis and includes a proximal end. A radius between the first helical arm and the first central axis decreases in a distal direction away from the proximal end of the first helical arm. The second helical arm is nested in the first helical arm and encircles a second central axis. The second helical arm also includes a proximal end. A radius between the second helical arm and the second central axis decreases in a distal direction away from the proximal end of the second helical arm.

Single band and multiband wireless antennas are an important element of wireless systems. Competing tradeoffs of overall footprint, performance aspects such as impedance matching and cost require not only consideration but become significant when multiple antenna elements are employed within a single antenna such as to obtain circular polarization transmit and/or receive. Accordingly, it would be beneficial to provide designers of a wide range of electrical devices and systems with compact single or multiple frequency band antennas which, in addition to providing the controlled radiation pattern and circular polarization purity (where required) are impedance matched without substantially increasing the footprint of the antenna and/or the complexity of the microwave/RF circuit interfaced to them, whilst supporting multiple signals to/from multiple antenna elements in antennas employing them. Solutions present achieve this through provisioning one or more capacitive series reactances discretely or in combination with one or more shunt capacitive reactances.

An antenna comprises an axial helical radiating element and a corrugated ground plane. The axial helical radiating element provides a radiation pattern substantially parallel to a primary axis of rotation of the helical radiating element. The corrugated ground plane, disposed proximate to a back region of the antenna, comprises corrugations to increase an electrical length of travel for radial standing waves between an axial helical input, at which the axial helical radiating element is coupled to the corrugated ground plane, to an outer edge of the corrugated ground plane.

A radiofrequency antenna is adapted to be mounted on a spacecraft. The radiofrequency antenna includes four helical strands of a super elastic shape memory alloy and is configured to move from a deployed configuration to a constrained stacking configuration and to return autonomously to the deployed configuration.

A portable information handling system or docking station glass ceramic housing integrates antenna conductive wires in a first glass ceramic piece and a director conductive wire in a second glass ceramic piece coupled to the first ceramic glass piece, such as with optically-clear adhesive. A conductive contact interfaces the antenna conductive wire by exposure at the glass ceramic housing interior where pogo pins of a printed circuit board assembly bias against the conductive contacts to communicate the radio signals. The director conductive wire provides a parasitic element for directional control of the wireless signal. Ground conductive wires may integrate in the exterior side of the second glass ceramic piece and interface with the radio to provide a dipole antenna.

Wireless occupancy sensors and methods for using the same are provided. In some embodiments, a occupancy sensor comprises: a housing that includes a window positioned at a top portion of the housing; a battery at a lower portion of the housing; a first magnetometer that detects changes in a magnetic field when a vehicle moves over the first magnetometer; an optical sensor that detects one or more objects in a field of view of the optical sensor through the window; a transmitter for transmitting sensor data to a gateway device, and a processor that controls the first magnetometer, the optical sensor, and the transmitter.

A microstrip line filtering radiation oscillator, a filtering radiation unit, and an antenna, the oscillator includes a substrate. A plurality of first metal sheets parallel to each other are arranged at intervals on a front surface of the substrate, a plurality of second metal sheets parallel to each other are arranged at intervals on a back surface of the substrate, and the first and second metal sheets are correspondingly staggered and coupled by a coupling part running through the substrate. The microstrip line filtering radiation oscillator has functions of signal radiation and interference suppression. The filtering radiation unit includes at least one oscillator and can be used in conjunction with a high-frequency radiation unit, to radiate high-frequency and low-frequency signals simultaneously. The antenna includes at least one filtering radiation unit, and can transmit low-frequency and high-frequency signals simultaneously, thereby effectively improving the integration and reducing the volume of the antenna.

A transmission device for a motor vehicle for transmitting a radio signal is provided. A coil antenna is provided for emitting the radio signal, and an electric driver circuit is designed to generate an electric alternating current with a specified transmission frequency in the coil antenna. The coil antenna is arranged on at least one support element, and a parasitic parallel capacitance acting parallel to an intrinsic inductance of the coil antenna is produced by virtue of the geometry and/or the material of the at least one support element and/or by virtue of the shape of the coil antenna, the parasitic parallel capacitance together with the intrinsic inductance functioning as a parallel resonant circuit with a specified intrinsic resonant frequency with respect to the driver circuit.

There is provided an antenna device for a vehicle capable of suppressing interference in a case where a plurality of antennas which receive signals in different frequency bands are close to one another. The antenna device for the vehicle includes a patch antenna and a capacitance loading element which are installed away from each other on an antenna base section which is attachable to a vehicle. The capacitance loading element is a part of an antenna capable of receiving a different use frequency band from which of the patch antenna, to form a three-dimensional shape in which a pair of linear conductors which respectively repeatedly turn in a predetermined direction are connected to each other via a linear connection conductor extending in a width direction of the antenna base section, and in the capacitance loading element, a length of a folded portion of each of the linear conductors is a non-resonant length of the patch antenna.

A header for an implantable medical device includes at least an antenna and a receptacle for receiving a signal transmission line. Either one or a combination of the antenna and the receptacle are encased in a dielectric material. The dielectric material can be one of or include one of a polymer, a ceramic material, polyoxymethylene, polysulfone, polybutylene terephthalate. A medical device and a method for assembling a medical device are also provided.