A magnetic field focusing assembly includes a magnetic field generating device configured to generate a magnetic field, and a split ring resonator assembly configured to be magnetically coupled to the magnetic field generating device and configured to focus the magnetic field produced by the magnetic field generating device.

A patch antenna includes a power feeding conductor pattern formed in a dielectric layer, a ground conductor pattern formed on the dielectric layer, a first parasitic conductor pattern and a second parasitic conductor pattern formed in/on the dielectric layer and is not set to have a ground potential. The first parasitic conductor pattern, the power feeding conductor pattern, the second parasitic conductor pattern, and the ground conductor pattern are arranged in this order in a cross section and overlap each other in a plan view. A resonant frequency f1 defined by an opposite-phase mode current flowing through the first parasitic conductor pattern is higher than a resonant frequency f2 defined by an in-phase mode current flowing through the power feeding conductor pattern, and a resonant frequency f3 defined by an opposite-phase mode current flowing through the second parasitic conductor pattern is lower than the resonant frequency f2.

A directional antenna includes a substrate, a power-supply radiating element, paired non-power-supply radiating elements, and a metal plate. The power-supply radiating element is formed on the front surface of the substrate to be along the vertical direction. The power-supply radiating element receives electric power from the power-supplying portion. The paired non-power-supply radiating elements are provided along the vertical direction and oppose each other across the power-supply radiating element in a horizontal direction which is a direction along the front surface of the substrate on the horizontal plane, when viewed in a front-rear direction. A part of the metal plate is provided behind a part of the power-supply radiating element. The metal plate is not provided behind the paired non-power-supply radiating elements. The 3 dB beam width of the directional antenna on the horizontal plane is equal to or greater than 180 degrees including the range forward of the directional antenna.

An antenna system includes a first substrate, the first substrate being a dielectric substrate, a first patch on a first surface of the dielectric substrate and a second patch on a second surface of the dielectric substrate. The first and second patches are coupled to form a first capacitor with the dielectric substrate. A second substrate is coupled to the first substrate and a ground layer is provided on a first surface of the second substrate. An antenna feed is coupled to the second substrate.

A technique is described where the switch and/or tunable control circuit for use with an active multi-mode antenna is positioned remote from the antenna structure itself for integration into host communication systems. Electrical delay and impedance characteristics are compensated for in the design and configuration of transmission lines or parasitic elements as the active multi-mode antenna structure is positioned in optimal locations such that significant electrical delay is introduced between the RF front-end circuit and multi-mode antenna. This technique can be implemented in designs where it is convenient to locate switches in a front-end module (FEM) and the FEM is located in vicinity to the transceiver.

An antenna device and its control method is provided. The antenna device includes: a ground layer; a feeding element, connecting to the ground layer; a first radiating element, extending along a first direction and connected to the ground layer; a second radiating element, extending along a second direction which is orthogonal to the first direction, and connected the ground layer; a first switching element, coupled between the feeding element and the first radiating element, and configured to electrically connect or disconnect the feeding element and the first radiating element; and a second switching element disposed between the feeding element and the second radiating element, and configured to electrically connect or disconnect the feeding element and the second radiating element.

A patch antenna device configured to receive a radio communication signal includes a circuit board, a patch antenna, and a parasitic element. The circuit board has a signal processing circuit placed thereon. The patch antenna is stacked on the circuit board and has a quadrangular radiation element. The parasitic element is disposed above the patch antenna so as to improve antenna gain characteristics of the patch antenna and configured such that the length of the upper side of the parasitic element is shorter than the width in a plan view of the radiation element of the patch antenna and that the length between the upper and lower sides of the parasitic element is longer than the length between the upper and lower sides of the radiation element of the patch antenna.

A filter-antenna and a method for making a filter-antenna. The filter antenna includes a microstrip antenna, such as a patch antenna, integrated with an absorptive (e.g., bandstop) filter for absorbing or dissipating energy.

An antenna module configured to receive a radio communication signal includes: a circuit board on which a signal processing circuit is placed; a patch antenna stacked on the circuit board; a parasitic element disposed above the patch antenna, having held portions having at least two sides opposed to each other, and configured to improve elevation angle reception characteristics of the patch antenna; an integrated resin holder supporting the circuit board and the parasitic element, having at least a pair of parasitic element locking pawls that sandwich and support the two sides of the held portions of the parasitic element from both sides such that the distance between the patch antenna and the parasitic element is kept constant.

A patch antenna includes: a radiating element having a flat-plate shape; and a parasitic element provided at a position spaced away from the radiating element in planar view in which the radiating element is seen from a direction perpendicular to a plate surface of the radiating element. A longitudinal direction of the parasitic element is oriented along a direction of a line segment connecting a center of the radiating element and a feeding point in the planar view.