An antenna includes an antenna body and a housing case. The antenna body configured to enter a first mode exhibiting an artificial magnetic conductor character with respect to an electromagnetic wave in a first frequency band and configured to enter in a second mode (TM mode) serving as a resonator for the electromagnetic wave in a second frequency band higher than the first frequency band. The housing case includes a bottom plate on which the antenna body is installed and a side wall provided standing from the bottom plate and spaced with a distance from a periphery of the antenna body. The housing case is a case made of metal including an opening in a face through which the electromagnetic wave enters and exits.

An antenna includes an antenna body and a housing case. The antenna body configured to enter a first mode exhibiting an artificial magnetic conductor character with respect to an electromagnetic wave in a first frequency band and configured to enter in a second mode (TM mode) serving as a resonator for the electromagnetic wave in a second frequency band higher than the first frequency band. The housing case includes a bottom plate on which the antenna body is installed and a side wall provided standing from the bottom plate and spaced with a distance from a periphery of the antenna body. The housing case is a case made of metal including an opening in a face through which the electromagnetic wave enters and exits.

The size of a solid-state imaging device that captures images is reduced. The solid-state imaging device includes an array antenna. A plurality of rectifying antenna circuits is arranged in the array antenna. Each of the plurality of rectifying antenna circuits includes a rectifying antenna and a pixel signal generating unit. The pixel signal generating unit includes a floating diffusion layer, a transfer transistor that transfers charge from the rectifying antenna to the floating diffusion layer in accordance with a transfer signal, a reset transistor that initializes the amount of charge in the floating diffusion layer in accordance with a reset signal, an amplification transistor that amplifies a voltage corresponding to the amount of charge accumulated in the floating diffusion layer, and a selection transistor that outputs a signal of the amplified voltage as a pixel signal in accordance with a selection signal.

The size of a solid-state imaging device that captures images is reduced. The solid-state imaging device includes an array antenna. A plurality of rectifying antenna circuits is arranged in the array antenna. Each of the plurality of rectifying antenna circuits includes a rectifying antenna and a pixel signal generating unit. The pixel signal generating unit includes a floating diffusion layer, a transfer transistor that transfers charge from the rectifying antenna to the floating diffusion layer in accordance with a transfer signal, a reset transistor that initializes the amount of charge in the floating diffusion layer in accordance with a reset signal, an amplification transistor that amplifies a voltage corresponding to the amount of charge accumulated in the floating diffusion layer, and a selection transistor that outputs a signal of the amplified voltage as a pixel signal in accordance with a selection signal.

A wide band directional antenna includes three elements which are partially aligned, electrically isolated from each other, of which a lower element includes at least one reflector circuit, a middle element comprises at least one dipole circuit connected to a transmission line, and an upper element includes a director circuit, wherein the dipole circuit includes at least one first pair of conductive elements, suitable for forming a minor dipole connected to the transmission line, and at least one second pair of electrically isolated conductive elements, excited with capacitive effect by the minor dipole, in such a way as to form a major dipole.

A wide band directional antenna includes three elements which are partially aligned, electrically isolated from each other, of which a lower element includes at least one reflector circuit, a middle element comprises at least one dipole circuit connected to a transmission line, and an upper element includes a director circuit, wherein the dipole circuit includes at least one first pair of conductive elements, suitable for forming a minor dipole connected to the transmission line, and at least one second pair of electrically isolated conductive elements, excited with capacitive effect by the minor dipole, in such a way as to form a major dipole.

An antenna element includes a first conductor at a first lateral surface of a substrate having a feed line portion and a monopole portion with a neck extending from the feed line portion and a head at a distal end of the neck. The head has a width greater than a width of the neck and greater than a width of the feed line portion. The head has a slot to increase a bandwidth of the first conductor to at least a first frequency band and a second frequency band. A second conductor is provided on the first lateral surface having first and second ground planes and first and second stubs. The ground planes are disposed adjacent to the feed line portion at opposite sides thereof. The stubs are disposed at opposite sides of the ground planes and extend in a direction essentially parallel to the feed line portion. The ground planes and the stubs are arranged relative to the first conductor to form a coplanar waveguide.

An antenna element includes a first conductor at a first lateral surface of a substrate having a feed line portion and a monopole portion with a neck extending from the feed line portion and a head at a distal end of the neck. The head has a width greater than a width of the neck and greater than a width of the feed line portion. The head has a slot to increase a bandwidth of the first conductor to at least a first frequency band and a second frequency band. A second conductor is provided on the first lateral surface having first and second ground planes and first and second stubs. The ground planes are disposed adjacent to the feed line portion at opposite sides thereof. The stubs are disposed at opposite sides of the ground planes and extend in a direction essentially parallel to the feed line portion. The ground planes and the stubs are arranged relative to the first conductor to form a coplanar waveguide.

Antenna has a split ring resonator. Moreover, the antenna is provided with a first conductor and a second conductor which form, at least in part, an open stub or a short stub which has a predetermined electrical length. With this structure, the antenna can have a plurality of operating frequencies.

Antenna has a split ring resonator. Moreover, the antenna is provided with a first conductor and a second conductor which form, at least in part, an open stub or a short stub which has a predetermined electrical length. With this structure, the antenna can have a plurality of operating frequencies.