A cable antenna an end part of which is connected to an oscillator that supplies a high-frequency current is disclosed. The cable antenna includes: an inner conductor; an insulating layer covering the inner conductor; and an outer conductor covering the insulating layer, wherein only one exposed part is formed in a middle part of the cable antenna in a longitudinal direction, the exposed part formed by removing at least the outer conductor, a distance L between a tip end of the cable antenna and an end of the exposed part on a side closer to the tip end is an odd multiple of a quarter of a wavelength λ of the high-frequency current, the multiplier being three or greater, and a length G of the exposed part in the longitudinal direction satisfies the following formula (1):

$\lambda /20\le \text{G}\text{<}\lambda /4\mathrm{...}$

λ: wavelength (mm) of the high-frequency current.

A bendable antenna is provided. The bendable antenna is adapted to connect a cable. The bendable antenna includes an antenna body, a connection base, a first pivot base, a second pivot base, a first elastic element and a first restriction structure. The connection base is connected to the antenna body. The first pivot base is connected to the connection base, wherein the first pivot base includes a first recess. The second pivot base pivots on the first pivot base. The first elastic element is disposed in the first recess of the first pivot base, wherein the first elastic element is telescoped on the cable. The first restriction structure is connected to the connection base, wherein the first restriction structure pushes the first elastic element to restrict the first elastic element in the first recess.

A bendable antenna is provided. The bendable antenna is adapted to connect a cable. The bendable antenna includes an antenna body, a connection base, a first pivot base, a second pivot base, a first elastic element and a first restriction structure. The connection base is connected to the antenna body. The first pivot base is connected to the connection base, wherein the first pivot base includes a first recess. The second pivot base pivots on the first pivot base. The first elastic element is disposed in the first recess of the first pivot base, wherein the first elastic element is telescoped on the cable. The first restriction structure is connected to the connection base, wherein the first restriction structure pushes the first elastic element to restrict the first elastic element in the first recess.

When three directions perpendicular to each other are defined as x-direction, y-direction and z-direction, the electromagnetic wave reception device is provided with the two or more antenna electrodes extending in the x-direction, the two or more antenna electrodes are arranged parallel to each other and arranged in the z-direction, and the two or more antenna electrodes are connected by the common lead wire, and the antenna electrodes are connected between the two or more antenna electrodes that are adjacent to each other by repeatedly applying a voltage having opposite characteristics to each other, an electromagnetic wave having a resonance frequency determined by the electromagnetic wave velocity and a distance between the antenna electrodes that are adjacent to each other is induced, and the electromagnetic wave is transmitted to a space in the z-direction.

An antenna module includes a multilayer board, a phased array antenna that includes antenna elements arranged on an outer face of a second conductor layer included in the multilayer board and adjusts one or more beam directions of the antenna elements, a radio frequency (RF) chip that is arranged on an outer face of first conductor layers included in the multilayer board and outputs the radio frequency signal, a matching circuit that is arranged on the outer face of the first conductor layers and adjusts matching between impedance of the antenna elements and impedance of the RF chip, a through hole that couples the first conductor layers and the second conductor layer, and one or more vias that are on an outer side in a diameter direction of the through hole and couples the first conductor layers.

A long range low frequency antenna having an elongated magnetic core; a coil surrounding the elongated magnetic core; a bobbin; where the elongated magnetic core is introduced in a cavity of the bobbin; and a housing overmolded on the bobbin in a waterproof manner. The antenna also comprises at least one damper located at one extreme of the elongated magnetic core. The at least one damper is made of an elastic and thermally-stable compound having a resin and a first filler including a natural mineral filler. Therefore, longitudinal dilatations, shrinkage, mechanical shocks, and vibrations of the elongated magnetic core are absorbed by the at least one damper, avoiding an impact over an inductance variation of the coil.

A long range low frequency antenna having an elongated magnetic core; a coil surrounding the elongated magnetic core; a bobbin; where the elongated magnetic core is introduced in a cavity of the bobbin; and a housing overmolded on the bobbin in a waterproof manner. The antenna also comprises at least one damper located at one extreme of the elongated magnetic core. The at least one damper is made of an elastic and thermally-stable compound having a resin and a first filler including a natural mineral filler. Therefore, longitudinal dilatations, shrinkage, mechanical shocks, and vibrations of the elongated magnetic core are absorbed by the at least one damper, avoiding an impact over an inductance variation of the coil.

When three directions perpendicular to each other are defined as x-direction, y-direction and z-direction, the electromagnetic wave reception device is provided the two or more electrodes extending in the x-direction, the two or more electrodes are arranged parallel to each other and arranged in the z-direction, and the two or more electrodes are connected by the common lead wire, and the electromagnetic wave velocity and the electrodes are connected between the two or more electrodes that are adjacent to each other by repeatedly applying a voltage having opposite characteristics to each other, an electromagnetic wave having a resonance frequency determined by an interval between intervals is induced, and the electromagnetic wave is transmitted to a space in the z-direction.

A bendable antenna is provided. The bendable antenna is adapted to connect a cable. The bendable antenna includes an antenna body, a connection base, a first pivot base, a second pivot base, a first elastic element and a first restriction structure. The connection base is connected to the antenna body. The first pivot base is connected to the connection base, wherein the first pivot base includes a first recess. The second pivot base pivots on the first pivot base. The first elastic element is disposed in the first recess of the first pivot base, wherein the first elastic element is telescoped on the cable. The first restriction structure is connected to the connection base, wherein the first restriction structure pushes the first elastic element to restrict the first elastic element in the first recess.

A bendable antenna is provided. The bendable antenna is adapted to connect a cable. The bendable antenna includes an antenna body, a connection base, a first pivot base, a second pivot base, a first elastic element and a first restriction structure. The connection base is connected to the antenna body. The first pivot base is connected to the connection base, wherein the first pivot base includes a first recess. The second pivot base pivots on the first pivot base. The first elastic element is disposed in the first recess of the first pivot base, wherein the first elastic element is telescoped on the cable. The first restriction structure is connected to the connection base, wherein the first restriction structure pushes the first elastic element to restrict the first elastic element in the first recess.