Abstract: An antenna device includes a first substrate, a second substrate, an excitation component, rectangular radiation components, circular radiation components and an impedance matching component. The first substrate has a first bottom surface and a first top surface facing away from each other. The second substrate is stacked on the first substrate and has a second bottom surface and a second top surface facing away from each other. The second bottom surface is connected to the first top surface. The excitation component is disposed on the first bottom surface. The rectangular radiation components and the circular radiation components are disposed on the second top surface. The rectangular radiation components surround the circular radiation components. The impedance matching component is disposed on the second top surface. The circular radiation components surround the impedance matching component. The circular radiation components are spaced apart from the impedance matching component by identical distances.

Abstract: An antenna device includes a substrate and an antenna component. The antenna component is disposed on the substrate, and includes two hook-shaped excitation bodies, a guider, a reflector and an impedance matching body. The hook-shaped excitation bodies are spaced apart from each other and symmetrical to each other. Opposite ends of the hook-shaped excitation bodies are respective located opposite to each other. An end of one of the hook-shaped excitation bodies has a feeding end. An end of another one of the hook-shaped excitation bodies has a grounding end located opposite to the feeding end. The guider is located on a side of the hook-shaped excitation bodies. The reflector is located on a side of the hook-shaped excitation bodies located away from the guider. The impedance matching body includes an inductor. The inductor is located between the hook-shaped excitation bodies and the reflector.

Abstract: An antenna device includes a resonance casing, a substrate, a high frequency component and a low frequency component. The substrate is disposed on the resonance casing. The high frequency component is disposed on the substrate, and has a high frequency excitation slot and a high frequency matching slot. The low frequency component includes a first low frequency portion, a second low frequency portion and a third low frequency portion. The first low frequency portion, the second low frequency portion and the third low frequency portion are located on a side of the high frequency component. The second low frequency portion is connected to the high frequency component. The high frequency component, the first low frequency portion and the second low frequency portion together surround the third low frequency portion. A side of the second low frequency portion has a low frequency matching slot.

Abstract: An antenna device includes a substrate, an excitation component and a low frequency matching component. The substrate has a first surface and a second surface facing away from each other. The excitation component is disposed on the first surface. The excitation component includes two first excitation portions and a second excitation portion spaced apart from each other. The two first excitation portions are symmetrical. Each of the two first excitation portions includes a first excitation section, a second excitation section, a third excitation section, a fourth excitation section and a fifth excitation section connected to each other. The fourth excitation sections of the two first excitation portions and the second excitation portion are adjacent to different sides of the substrate. A low frequency matching component is disposed on the second surface, and is spaced apart from sides of the substrate.

Abstract: A monitoring structure without chip including at least one first monitoring component. The at least one first monitoring component includes a first substrate and a first signal sensing portion. The first signal sensing portion includes a first signal sensing section, a second signal sensing section, a third signal sensing section and a fourth signal sensing section. The first signal sensing section, the second signal sensing section, the third signal sensing section and the fourth signal sensing section are disposed along a periphery of the substrate. The first signal sensing section and the third signal sensing section are connected to two opposite ends of the second signal sensing section, respectively. The fourth signal sensing section is connected to the third signal sensing section, and is spaced apart from the first signal sensing section via a notch.

Abstract: An antenna device includes a first substrate, a second substrate, an excitation component, rectangular radiation components, circular radiation components and an impedance matching component. The first substrate has a first bottom surface and a first top surface facing away from each other. The second substrate is stacked on the first substrate and has a second bottom surface and a second top surface facing away from each other. The second bottom surface is connected to the first top surface. The excitation component is disposed on the first bottom surface. The rectangular radiation components and the circular radiation components are disposed on the second top surface. The rectangular radiation components surround the circular radiation components. The impedance matching component is disposed on the second top surface. The circular radiation components surround the impedance matching component. The circular radiation components are spaced apart from the impedance matching component by identical distances.

Abstract: An antenna device includes a substrate and an antenna component. The antenna component is disposed on the substrate, and includes two hook-shaped excitation bodies, a guider, a reflector and an impedance matching body. The hook-shaped excitation bodies are spaced apart from each other and symmetrical to each other. Opposite ends of the hook-shaped excitation bodies are respective located opposite to each other. An end of one of the hook-shaped excitation bodies has a feeding end. An end of another one of the hook-shaped excitation bodies has a grounding end located opposite to the feeding end. The guider is located on a side of the hook-shaped excitation bodies. The reflector is located on a side of the hook-shaped excitation bodies located away from the guider. The impedance matching body includes an inductor. The inductor is located between the hook-shaped excitation bodies and the reflector.

Abstract: An antenna device includes a substrate, an excitation component and a low frequency matching component. The substrate has a first surface and a second surface facing away from each other. The excitation component is disposed on the first surface. The excitation component includes two first excitation portions and a second excitation portion spaced apart from each other. The two first excitation portions are symmetrical. Each of the two first excitation portions includes a first excitation section, a second excitation section, a third excitation section, a fourth excitation section and a fifth excitation section connected to each other. The fourth excitation sections of the two first excitation portions and the second excitation portion are adjacent to different sides of the substrate. A low frequency matching component is disposed on the second surface, and is spaced apart from sides of the substrate.

Abstract: The invention provides a frequency selective surface structure including a substrate and at least one conductive layer. The at least one conductive layer is disposed on the substrate and includes four central double-frequency patches. The four central double-frequency patches are spaced apart from one another and are arranged in a 2×2 array. In each of the four central double-frequency patches, the central double-frequency patch is in a polygonal shape and has a central corner part, a plurality of outer corner parts and a plurality of notches, the central corner part is located closer to a geometric center of the at least one conductive layer than the plurality of outer corner parts, and the plurality of notches are located on the plurality of outer corner parts, respectively.

Abstract: An antenna device includes a first substrate, a second substrate, a radiation portion and an exciter. The second substrate is stacked on the first substrate. The exciter is disposed on the first substrate and includes a feeding transmission portion, an exciting portion, a connection portion and an impedance match portion. The feeding transmission portion is connected to a side of the exciting portion. The exciting portion and the impedance match portion are connected to two opposite sides of the connection portion, respectively. The radiation portion is located on the second substrate and includes a first radiation component, a second radiation component and a third radiation component. The first radiation component is disposed at a side of the second radiation component. The first radiation component and the second radiation component are disposed at a side of the third radiation component.

Abstract: An antenna device includes a first substrate, a second substrate, a low frequency exciting assembly and a high frequency exciter. The first substrate has a first top surface and a first bottom surface located opposite to each other. The second substrate is stacked on the first substrate, and has a second top surface and a second bottom surface located opposite to each other. The second bottom surface is connected to the first top surface. The low frequency exciting assembly is disposed on the first top surface. The high frequency exciter is disposed on the second top surface. A projection of the high frequency exciter orthogonally projected onto the first substrate does not overlap with the low frequency exciting assembly.

Abstract: An antenna device includes a first substrate, a second substrate, a radiation portion and a cross-shaped exciter. The first substrate has a first top surface. The first substrate is stacked on the second substrate. The second substrate has a second top surface and a bottom surface. The second top surface faces away from the bottom surface. The radiation portion is disposed on the first top surface, and includes a first radiation component, a second radiation component, a third radiation component and a fourth radiation component. The first radiation component and the fourth radiation component are arranged on the first top surface symmetrically along a diagonal of the first top surface. The second radiation component and the third radiation component are arranged on the first top surface symmetrically along another diagonal of the first top surface. The cross-shaped exciter is disposed on the top surface.

Abstract: An antenna device includes a first substrate, a second substrate, a T-shaped exciter and a radiator. The first substrate has a first bottom surface and a first top surface opposite to each other. The second substrate is stacked on the first substrate, and has a second bottom surface and a second top surface opposite to each other. The second bottom surface faces the first top surface. The T-shaped exciter is disposed on the first bottom surface, and includes a head portion and an extending portion. The extending portion is connected to a side of the head portion. The radiator is disposed on the second top surface, and includes two first radiation components and two second radiation components arranged along two diagonals of the radiator, respectively. A size of each of the two first radiation components is different from a size of each of the two second radiation components.

Abstract: An antenna device includes a substrate, two T-shaped radiation portions, two feeding portions and an isolation structure. The substrate has an upper surface, a side surface and a lower surface. Two opposite ends of the side surface are connected to the upper surface and the lower surface, respectively. The two T-shaped radiation portions are located on the upper surface of the substrate. The two feeding portions are connected to the two T-shaped radiation portions, respectively, and the two feeding portions are located on the side surface of the substrate. The isolation structure is located on the upper surface of the substrate, and the isolation structure is disposed between the two T-shaped radiation portions.

Abstract: An electronic device includes a shell and an antenna assembly. The casing has an accommodating space. The antenna assembly is located in the accommodating space, and includes a substrate, a first antenna component, a second antenna component and a third antenna component. The first antenna component, the second antenna component and the third antenna component are disposed on the substrate. The first antenna component includes a first radiation portion and a first ground portion, which are disposed on two opposite sides of the substrate. The second antenna component includes a second radiation portion and a second ground portion, which are disposed on two opposite sides of the substrate. The third antenna component includes a third radiation portion and a third ground portion, which are disposed on two opposite sides of the substrate.

Abstract: An antenna device includes a substrate and four antenna units. The four antenna units are disposed on the substrate. Each of the four antenna units includes an L-shaped radiation portion, a hook-shaped coupling portion and a ground portion. The hook-shaped coupling portion is adjacent to the L-shaped radiation portion. The ground portion is disposed around the L-shaped radiation portion and the hook-shaped coupling portion. One end of the hook-shaped coupling portion is connected to the ground portion.

Abstract: An electronic device includes a shell and an antenna assembly. The casing has an accommodating space. The antenna assembly is located in the accommodating space, and includes a substrate, a first antenna component, a second antenna component and a third antenna component. The first antenna component, the second antenna component and the third antenna component are disposed on the substrate. The first antenna component includes a first radiation portion and a first ground portion, which are disposed on two opposite sides of the substrate. The second antenna component includes a second radiation portion and a second ground portion, which are disposed on two opposite sides of the substrate. The third 10 antenna component includes a third radiation portion and a third ground portion, which are disposed on two opposite sides of the substrate.

Abstract: A signal isolation device includes an insulation layer, at least one metal foil unit, and a metal layer. The at least one metal foil unit is disposed on a top surface of the insulation layer, and the metal foil unit has a first recessed channel and a second recessed channel. The first recessed channel and the second recessed channel spirally extend inward from an edge of the metal foil unit, and the first recessed channel and the second recessed channel surrounding each other are spaced apart. The metal layer is disposed on a bottom surface of the insulation layer.

Abstract: An antenna device includes a first substrate, a second substrate, a radiation portion and a cross-shaped exciter. The first substrate has a first top surface. The first substrate is stacked on the second substrate. The second substrate has a second top surface and a bottom surface. The second top surface faces away from the bottom surface. The radiation portion is disposed on the first top surface, and includes a first radiation component, a second radiation component, a third radiation component and a fourth radiation component. The first radiation component and the fourth radiation component are arranged on the first top surface symmetrically along a diagonal of the first top surface. The second radiation component and the third radiation component are arranged on the first top surface symmetrically along another diagonal of the first top surface. The cross-shaped exciter is disposed on the top surface.

Abstract: An antenna device includes a first substrate, a second substrate, a radiation portion and an exciter. The second substrate is stacked on the first substrate. The exciter is disposed on the first substrate and includes a feeding transmission portion, an exciting portion, a connection portion and an impedance match portion. The feeding transmission portion is connected to a side of the exciting portion. The exciting portion and the impedance match portion are connected to two opposite sides of the connection portion, respectively. The radiation portion is located on the second substrate and includes a first radiation component, a second radiation component and a third radiation component. The first radiation component is disposed at a side of the second radiation component. The first radiation component and the second radiation component are disposed at a side of the third radiation component.