A thin film, flexible antenna that has particular application to be adhered to vehicle glass, where the antenna is operable to receive right-hand or left-hand circularly polarized signals from, for example, GPS and SDARS satellites. The antenna is a printed planar antenna formed to the substrate and includes a ground plane having an outer perimeter portion defining a slot therein and having a plurality of sides. A T-line tuning stub extends from one of the sides into the slot, a curved spur-line tuning stub extends from a corner where two sides of the perimeter portion meet and extends into the slot, and a radiating element electrically isolated from the perimeter portion extends into the slot. The perimeter portion is operable to generate circularly polarized signals to be received by the radiating element where the tuning stubs provide phase tuning of the circularly polarized signals.

In some embodiments, an antenna module includes an antenna element having a first side and a second side opposite the first side, the first side comprising a radiating side of the antenna element and a support structure disposed at the second side of the antenna element and configured to define a cavity, the support structure including a portion configured to reduce signal leakage between the antenna element and the cavity.

An antenna that provides a radiation pattern that is tilted relative to the perpendicular to the plane of the antenna is provided. The antenna may be located on an angled surface, but have its tilted beam reach maximum gain at its zenith. In alternative embodiments, the antenna may be substantially transparent or translucent allowing placement on a surface without blocking viewing through the surface.

An antenna apparatus having directivity includes an antenna portion having a power feeding portion, a plate-like first antenna element, and a second antenna element connected to a side of the first antenna element through the power feeding portion, the second antenna element having a width smaller than that of the first antenna element; and a plate-like parasitic element disposed opposite to the antenna portion. The parasitic element has a length that is approximately one-half or more of a wavelength of an operating frequency. The second antenna element has a length that is shorter than one-fourth of the wavelength of the operating frequency. The antenna portion and the parasitic element have a distance capable of being connected electromagnetically to each other.

The technology described herein relates to polarization adaptive wireless power transmission systems. In an implementation, a wireless power transmission system is described. The wireless power transmission system includes an antenna array and control circuitry operatively coupled to the antenna array. The control circuitry is configured to determine polarization information of a beacon signal received from a client device at multiple antennas of the antenna array. The beacon signal is transmitted by a client device in a wireless power delivery environment. The control circuitry is further configured to configure polarization information associated with each of the multiple antennas to match the polarization information determined at respective antennas of the multiple antennas. The present technology enables different wireless power receiver clients to have different polarizations. The wireless power transmission system can efficiently send power to the client devices by matching their polarization.

An antenna device configured for wireless positioning. The antenna device includes a ground plane having a polygonal shape comprising at least 4 side edges. A plurality of chip antenna elements tuned to a predetermined radio frequency are each singly provided at one of said side edges with a spacing between adjacent ones of said chip antenna elements corresponding to ½ of a wavelength of said predetermined radio frequency. A patch antenna element tuned to said predetermined radio frequency is provided at a center portion of a front side of the ground plane.

In some embodiments, a phased array antenna, includes a plurality of antenna modules arranged in an antenna lattice configuration to form the phased array antenna, wherein an antenna module of the plurality of antenna modules includes an antenna element packaged together with an amplifier.

A modified-material-based high-precision combined antenna for satellite navigation and communications includes a high-frequency satellite navigation antenna metal radiating surface, a low-frequency satellite navigation antenna metal radiating surface, a WIFI/Bluetooth antenna metal radiating surface, a PCB, a shielding metal cavity and an injection molded modified-material-based substrate. The low-frequency satellite navigation antenna metal radiating surface is located between the high-frequency satellite navigation antenna metal radiating surface and the PCB. The WIFI/Bluetooth antenna metal radiating surface is located on a side of the low-frequency satellite navigation antenna metal radiating surface. The injection molded modified-material-based substrate is made of polyphenyl ether doped with a modified material, and the modified material has a relative permittivity of 2.65 and a density of 1.06 g/cm.sup.3. The injection molded modified-material-based substrate includes a first injection molded modified-material-based substrate and a second injection molded modified-material-based substrate.

According to one embodiment, an antenna apparatus includes at least four first to Nth circularly polarized antennas in a planar shape; and phase adjustment circuitry adjusting phase relationship between first to Nth signals of the first to Nth circularly polarized antennas. The first to Mth circularly polarized antennas and the M+1th to Nth circularly polarized antennas are arranged at positions surface-symmetrical to each other. The first to Nth circularly polarized antennas are rotated in direction at first to Nth angles with respect to a first direction parallel to the first to Nth circularly polarized antennas. The phase adjustment circuitry is configured to set phases of the first to Mth signals to first to Mth phases corresponding to the first to Mth angles, and set phases of the M+1th to Nth signals to M+1th to Nth phases added by a first value to phases corresponding to the M+1th to Nth angles.

An antenna array for full duplex communications is described. The antenna array includes an array antenna elements supported by a substrate. The substrate includes a feed network and a parallel plate waveguide layered with the feed network. The parallel plate waveguide has a core of varying dielectric constant, wherein the varying dielectric constant varies from a first probe connected to a first antenna element to a second probe connected to a second antenna element.