Abstract: Disclosed are devices and methods for selecting, at an antenna reflector, electromagnetic waves with a certain polarization and frequency and rejecting electromagnetic waves with different polarizations and/or frequencies. In one aspect, a directional antenna includes a shaped reflector surface with a series of conforming layers attached to the surface. The layers include a reflecting layer that causes reflection of electromagnetic waves at a specific frequency and polarization. Underneath the reflecting layer is a frequency selective surface (FSS) layer that absorbs electromagnetic waves not at the specific frequency or polarization which pass through the reflecting layer. Underneath the absorbing layer is a conductive layer.

Abstract: Magnetic antenna techniques and devices are disclosed for operating at an RF or microwave frequency by using a magnetic antenna structure that is configured to have a spatially varying property that varies spatially from one location to another location in at least a portion of the magnetic antenna structure. Such a spatial varying property can be reflected in various ways, e.g., a resonator located in part of the magnetic antenna structure, or a spatially varying geometry profile in part of or the entirety of the magnetic antenna structure.

Abstract: An antenna is disclosed with a magnetic loop, a dipole electric field radiator inside the magnetic loop, and with symmetric geometry about the feed. This symmetry allows for realization of image theory and significant size reduction, whereby half of the antenna is removed and replaced by the image induced in a connected ground plane.

Abstract: An antenna system is provided, including a first antenna, a second antenna, a ground plane, and a resonant isolator located proximate to the first antenna and the second antenna. The resonant isolator is coupled to the ground plane at or proximate to one current null point created by a first antenna and at or proximate to a second current null point created by a second antenna, and is configured to isolate the first antenna from the second antenna at a resonance. In some cases, the resonant isolator may include at least two conductive portions that may be substantially parallel to one another. The resonant isolator may also include an active tuning element that may change the resonance at which the resonant isolator de-couples the two antennas. In some cases, each of the antennas may be a capacitively-coupled compound loop antenna.

Abstract: An antenna is disclosed with a magnetic loop, a dipole electric field radiator inside the magnetic loop, and with symmetric geometry about the feed. This symmetry allows for realization of image theory and significant size reduction, whereby half of the antenna is removed and replaced by the image induced in a connected ground plane.

Abstract: Source radio frequency energy (RF) is coupled wirelessly, with no direct physical contact, between two compound loop (CPL) antennas across a variety of barriers such as plastic, human tissues, glass, and air. The compound coupling interface is highly efficient in transferring the RF energy from a source including one CPL antenna to a destination including a second CPL antenna. A re-radiating structure including a further CPL antenna or a different type of antenna may be connected on the destination side to completely physically isolate the source side from the destination side. When the destination coupling antenna is removed, the source coupling antenna may operate as an efficient radiator at the desired operating frequencies. Likewise, the destination coupling antenna may operate as an efficient radiator in the absence of the source coupling antenna.

Abstract: An antenna system is provided, including a first antenna, a second antenna, a ground plane, and a resonant isolator located proximate to the first antenna and the second antenna. The resonant isolator is coupled to the ground plane at or proximate to one current null point created by a first antenna and at or proximate to a second current null point created by a second antenna, and is configured to isolate the first antenna from the second antenna at a resonance. In some cases, the resonant isolator may include at least two conductive portions that may be substantially parallel to one another. The resonant isolator may also include an active tuning element that may change the resonance at which the resonant isolator de-couples the two antennas. In some cases, each of the antennas may be a capacitively-coupled compound loop antenna.

Abstract: An antenna system is provided, including a first antenna, a second antenna, a ground plane, and a resonant isolator coupled to the first and second antennas. Each of the antennas is configured to be a capacitively-coupled compound loop antenna, and the resonant isolator is configured to provide isolation between the two antennas at resonance. The two antennas may be symmetrical or asymmetrical and include a first element that emits a magnetic field and a second element that generates an electrical field that is orthogonal to the magnetic field. The radiating element of the second element may be capacitively coupled to the remainder of the second element. The resonate isolator may be comprised of a single conductive element or two conductive elements that are capacitively coupled.

Abstract: Source radio frequency energy (RF) is coupled wirelessly (no physical contact) between two compound loop (CPL) antennas or one CPL and another type of antenna across a variety of barriers such as plastic, human tissues, glass, and air. The compound coupling interface created between the two antennas is highly efficient in transferring the RF energy from a source antenna to a destination including a CPL antenna. A re-radiating structure including a further CPL antenna or a different type of antenna may be connected on the destination side to completely physically isolate the source side from the destination side. When the destination coupling antenna is removed, the source coupling antenna may operate as an efficient radiator at the desired operating frequencies. Likewise, the destination coupling antenna may operate as an efficient radiator in the absence of the source coupling antenna.

Abstract: An antenna system is provided, including a first antenna, a second antenna, a ground plane, and a resonant isolator coupled to the first and second antennas. Each of the antennas is configured to be a capacitively-coupled compound loop antenna, and the resonant isolator is configured to provide isolation between the two antennas at resonance. The two antennas may be symmetrical or asymmetrical and include a first element that emits a magnetic field and a second element that generates an electrical field that is orthogonal to the magnetic field. The radiating element of the second element may be capacitively coupled to the remainder of the second element. The resonate isolator may be comprised of a single conductive element or two conductive elements that are capacitively coupled.

Abstract: Source radio frequency energy (RF) is coupled wirelessly, with no direct physical contact, between two compound loop (CPL) antennas across a variety of barriers such as plastic, human tissues, glass, and air. The compound coupling interface is highly efficient in transferring the RF energy from a source including one CPL antenna to a destination including a second CPL antenna. A re-radiating structure including a further CPL antenna or a different type of antenna may be connected on the destination side to completely physically isolate the source side from the destination side. When the destination coupling antenna is removed, the source coupling antenna may operate as an efficient radiator at the desired operating frequencies. Likewise, the destination coupling antenna may operate as an efficient radiator in the absence of the source coupling antenna.

Abstract: A wireless coupling method is suitable for use in calibration and testing of a radiofrequency device under test (DUT). The DUT includes a printed circuit board having one or more integral antennas. The wireless coupling method comprises the use of a test fixture to position the DUT a prescribed distance from a reference unit comprising a second printed circuit board with one or more similar integral antenna(s). Each antenna of the reference unit is aligned optimally to a corresponding antenna of the DUT for transmitting or receiving RF signals in one or more frequency channels in accordance with a test procedure script. Test equipment is coupled to the antennas and is used for measuring or generating each test of the test procedure and saving the measurements in memory.