Abstract: An antenna including a radiation portion is provided. The radiation portion includes a feed terminal and three conductor branch paths directly extending from the feed terminal. The three conductor branch paths are located on the same side of the feed terminal, and each has an initial direction, and any two of the three initial directions have an acute angle therebetween. A method for manufacturing an antenna having three operating frequency bands is also provided.

Abstract: A PTC composition comprises crystalline polymer and conductive filler. The conductive filler comprises tungsten carbide powder dispersed in the crystalline polymer, and the tungsten carbide powder comprises impurity of less than 7% by weight. The impurity comprises the materials other than tungsten monocarbide.

Abstract: A method of manufacturing an antenna is provided. The method includes steps of providing a substrate including a feed-in terminal and a ground terminal; and forming a ground conductor structure on the substrate extended from the feed-in terminal to the ground terminal and including a first conductor extended along a first direction, a second conductor extended from the first conductor along a second direction, a third conductor extended from the second conductor along a third direction, and a fourth conductor extended from the third conductor along a fourth direction, wherein a first obtuse angle is formed between the first direction and the second direction, a second obtuse angle is formed between the second direction and the third direction, and an acute angle is formed between the third direction and the fourth direction.

Abstract: A PTC device comprises two electrode layers and a PTC material layer laminated therebetween. The PTC material layer has a volumetric resistivity less than 0.2 ?-cm, and comprises a crystalline polymer, conductive ceramic fillers and crystalline low molecular weight organic compound. The crystalline polymer comprises thermoplastic polymer, thermosetting polymer or combination thereof. The conductive ceramic fillers dispersed in the crystalline polymer have volumetric resistivity less than 500 ??-cm, and comprise 40-70% by volume of the PTC material layer. The crystalline low molecular weight organic compound has a molecular weight less than 5000, and comprises 6-30% by volume of the PTC material layer. The hold current at 60° C. divided by a covered area of the PTC device is greater than 0.2 A/mm2, the hold current at 60° C. is 40-95% of the hold current at 25° C., and the trip temperature of the PTC device is less than 95° C.

Abstract: Disclosure is related to an omnidirectional antenna. Structurally the antenna includes multiple antenna units which are oppositely disposed around the edges of a grounded substrate. The antenna is able to handle at least two bands of electromagnetic signals. The body of each antenna unit includes a radiating member which is extended from an inverse-F portion type structure at the upper half of the body. A downward-protrudent feeding member is formed at the middle portion of the radiating member. A connecting member electrically connected to the substrate is formed at the lower half of the body, and associated with the radiating member. At least two upward-protrudent grounding members are formed onto the connecting member. The grounding members are jointly grounded with the substrate. It is noted that the feeding member is extended in the midst of the two grounding members. The opposite antenna units are mutually served be reflectors.

Abstract: A PTC composition comprises crystalline polymer and conductive ceramic filler dispersed therein. The crystalline polymer has a melting point less than 90° C. and comprises 5%-30% by weight of the PTC composition. The crystalline polymer comprises ethylene, vinyl copolymer or the mixture thereof. The vinyl copolymer comprises at least one of the functional group selected from the group consisting of ester, ether, organic acid, anhydride, imide or amide. The conductive ceramic filler comprises a resistivity less than 500 ??-cm and comprises 70%-95% by weight of the PTC composition. The PTC composition has a resistivity about 0.01-5 ?-cm and its resistance at 85° C. is about 103 to 108 times that at 25° C.

Abstract: An antenna interacting with a signal having a frequency is provided. The antenna includes a radiation element having a hollow portion having an angle corner related to the frequency, and including a first inner edge; a second inner edge, wherein the angle corner is formed by the first inner edge and the second inner edge; a third inner edge connected to the second inner edge; a first outer edge; and a second outer edge, wherein the first outer edge and the second outer edge form a first included angle.

Abstract: A method for adjusting an operation bandwidth of an antenna is provided. The antenna includes a radiation element, and the radiation element includes a first adjusting portion having a first width and a second adjusting portion having a second width. The method includes steps of seeking an operation frequency of the antenna; and adjusting the operation bandwidth of the antenna by adjusting the second width based on the operation frequency.

Abstract: An antenna configured to an RF shielding, comprising: an RF shielding having a feed-in signal open terminal; an antenna coupled to the RF shielding, and the RF shielding and the antenna are integrated, and the antenna comprising: a ground connection terminal coupled to the RF shielding; an impedance matching block coupled to the ground connection terminal; an radiation body coupled to the ground connection terminal, and the radiation body having a feed-in signal terminal corresponding to the feed-in signal open terminal, and expanding forward to the feed-in signal open terminal; and a radiation body expended terminal coupled to the radiation body.

Abstract: A wireless network receiver includes a circuit board and a connector structure. The connector structure is fixed on the circuit board, and the connector structure includes a connector and an antenna. The antenna, crossing the circuit board, and the connector are integrally formed with as a whole. The antenna includes a feeding connecting member, a horizontal radiator, a vertical radiator and a grounding connecting member. The horizontal radiator generates a horizontally polarized wave and is connected to the feeding connecting member. The vertical radiator generates a vertically polarized wave and is connected to the horizontal radiator. The grounding connecting member connects the horizontal radiator to the connector.

Abstract: A monopole antenna is disclosed. The monopole antenna includes a grounding terminal and a transmission line extending along a first direction and including a first terminal and a feeding terminal adjacent to the grounding terminal. The monopole antenna further includes a first radiator connected to the first terminal, extending along a second direction perpendicular to the first direction and operating within a first frequency range. The first radiator has a portion with a width increasing gradually along the second direction. The monopole antenna further includes a second radiator connected to the first terminal, extending along a third direction far away from the grounding terminal, having a first included angle with the transmission line, including a plurality of turns, and operating within a second frequency range.

Abstract: An antenna structure is disclosed. The antenna structure includes a symmetrizing portion and two radiation portions. The symmetrizing portion has an axis and two radiation portions are symmetrically connected to the symmetrizing portion along the axis. Each of the two radiation portions is formed in a boot shape within a quadrilateral region having a first edge with a first length, a second edge with a second length, a third edge with a third length and a fourth edge with a fourth length. Each radiation portion includes a first side having a length being equivalent to the first length, a second side having a length being equivalent to the second length, a third side having a length being at least one-sixth of the third length, a fourth side having a length being at least one-fifth of the fourth length, and a fifth side connecting the third side and the fourth side and forming an arc, wherein the arc follows a quarter trajectory of an ellipse.

Abstract: A multi-band inverted-F antenna including a ground plane, a signal feeding circuit, first, second and third main radiation parts is provided. The signal feeding circuit is electrically isolated from the ground plane and receives/transmits wireless signals. The first and the second main radiation part are both physically and electrically connected to the signal feeding circuit, and generate first and second frequency band operation modes for the inverted-F antenna, respectively. The third main radiation part is electrically isolated from the signal feeding circuit, the first and the second main radiation parts, and generates a third frequency band operation mode for the inverted-F antenna via to signal coupling between the first and the third main radiation parts and/or signal coupling between the second and the third main radiation parts.

Abstract: An antenna for receiving and transmitting a signal is provided. The antenna includes a connection portion receiving and transmitting the signal, a first radiation portion and a second radiation portion. The connection portion includes a first end, a second end and a third end, wherein the first end is configured at a first distance from a ground. The first radiation portion is connected to the second end, and includes at least one folding area forming thereon at least one folding segment, wherein the folding segment and the connection portion have therebetween a shortest distance being a second distance. The second radiation portion is connected to the third end.

Abstract: A dual-band monopole coupling antenna is disclosed, which comprises: a first radiation part, configured with a frame and an extension section while being disposed on a surface of a substrate; a second radiation part, disposed on the surface of the substrate at a position neighboring to the first radiation part for enabling a coupling effect between the two, allowing the second radiation part to be used as an extension of the first radiation part, and thus adjusting the operation frequency, impedance and impedance matching accordingly; a signal ground section, disposed coupling to the second radiation part; a signal feed-in section, disposed on the surface at a position neighboring to the signal ground section while coupling to the first radiation part; a ground, disposed coupling to the second radiation part; and a dielectric layer, disposed at an non-conductive area arranged between the first radiation part and the second radiation part.

Abstract: An antenna configured to an RF shielding, comprising: an RF shielding having a feed-in signal open terminal; an antenna coupled to the RF shielding, and the RF shielding and the antenna are integrated, and the antenna comprising: a ground connection terminal coupled to the RF shielding; an impedance matching block coupled to the ground connection terminal; an radiation body coupled to the ground connection terminal, and the radiation body having a feed-in signal terminal corresponding to the feed-in signal open terminal, and expanding forward to the feed-in signal open terminal; and a radiation body expended terminal coupled to the radiation body.

Abstract: A present invention relates to a monopole wideband antenna, that is a wall mounted handing type antenna capable of providing easy frequency adjustment and operating at broad frequency band range. Moreover, the monopole wideband antenna of the invention can be applied in various electronic devices, and is advantageous in its low cost and small size since it can be fabricated directly using a means of print formation upon a circuitboard.

Abstract: A PIFA includes a substrate having a first side, a second side, a third side, and a fourth side, a ground portion, a radiation body, a shortening portion, a shortening extension portion, and a ground extension portion. The first side is opposite to the third side, and the second side is opposite to the second side. The ground portion is adjacent to all of the first side, all of the fourth side, and a part of the third side. The radiation body is adjacent to the second side. The shortening portion is adjacent to a part of the second side and a part of the third side, and is electrically coupled to the radiation body and the ground portion. The radiation body is extended from the shortening portion toward the first side. The ground extension portion is extended from the ground portion toward the second side.

Abstract: A broadband planar inverted-F antenna includes a first radiation conductor, a second radiation conductor and a third radiation conductor. The first radiation conductor includes a first inclined-plane portion and a feeding point. The feeding point is located at one end of the first inclined-plane portion. The second radiation conductor is connected to the first radiation conductor at the feeding point. The third radiation conductor is connected to the first radiation conductor, and includes a second inclined-plane portion and a ground point. The second inclined-plane portion is separated from and facing to the first inclined-plane portion. The ground point is located at one end of the second inclined-plane portion and facing to the feeding point, wherein the distance between the first inclined-plane portion and the second inclined-plane portion is gradually increased from the part near the feeding point along a direction departing from the feeding point.

Abstract: A PTC composition comprises crystalline polymer and conductive ceramic filler dispersed therein. The crystalline polymer has a melting point less than 90° C. and comprises 5%-30% by weight of the PTC composition. The crystalline polymer comprises ethylene, vinyl copolymer or the mixture thereof. The vinyl copolymer comprises at least one of the functional group selected from the group consisting of ester, ether, organic acid, anhydride, imide or amide. The conductive ceramic filler comprises a resistivity less than 500 ??-cm and comprises 70%-95% by weight of the PTC composition. The PTC composition has a resistivity about 0.01-5 ?-cm and its resistance at 85° C. is about 103 to 108 times that at 25° C.