摘要:
An impedance matching circuit converts between an input impedance of an antenna and a characteristic impedance of a transmission line, such as a coaxial cable. The impedance matching circuit includes a transformer and a lumped circuit. The transformer has a primary side and a secondary side. The secondary side is configured to electrically connect with the antenna. The lumped circuit is electrically connected with the primary side, for converting the input impedance of the primary side to the characteristic impedance. An antenna assembly using the above-mentioned impedance matching circuit is also provided.
摘要:
A loop-type antenna for radio frequency identification includes a main body and a feed portion. The main body includes a loop member and at least one pair of coupled sections. The loop member has at least one gap. Each of the coupled sections is connected with one end of corresponding one of the at least one gap. The pair has identical extension direction. The feed portion is electrically connected with the loop member in the manner that the loop member is symmetrical in terms of the feed portion. An antenna array for radio frequency identification also is provided.
摘要:
A chip antenna has a dielectric material layer, a first meandered strip, a second meandered strip and several bended strips. The first meandered strip is meandered in one direction and disposed on the dielectric material layer. The second meandered strip is meandered in another direction and disposed on the dielectric material layer. The first meandered strip is connected to the second meandered strip. The bended strips are connected to the turns of the meandered strips.
摘要:
Electromagnetic absorber having serrations on a surface or surfaces thereof to reduce reflectivity of incident electromagnetic waves thereon. The serrations form a plurality of fins, the height of adjacent fins being spaced by a small distance. Preferably the total absorber wedge height is greater than about 1 wavelength at the lowest design frequency and the height between the serration tips is less than 1/4 wavelength at the lowest design frequency.
摘要:
A chip antenna apparatus for receiving global positioning system signals, includes a L-shaped ground area and an omni-directional chip antenna. The L-shaped ground area is disposed on a circuit board. The omni-directional chip antenna is disposed in a gap of the L-shaped ground area on the circuit board and electrically connected to the L-shaped ground area.
摘要:
An integrating SOC capable of integrating a micro-antenna System on Chip (SOC) of integrating micro-antennas comprises an existing radio frequency model, a circuit board and an antenna element to a package of single SOC. The micro-antenna element is formed by using antenna radiated conductor paths composing of a single-feeding end or multiple-feeding ends and multiple-curved paths. Active or passive elements are selected to match up the antenna element and relative circuits, and arranges on the circuit board. Then by using embedding type injection molding or glue-filling modeling, the single SOC is finished by the package of a radio frequency model and an antenna element.
摘要:
A device shell for use in a wireless communication device, is disclosed to have a shell body injection-molded from a compound material in a predetermined shape, and an antenna circuit formed in the shell body and electrically connectable to a circuit board in a wireless communication device in which the device shell is used.
摘要:
A chip antenna has a dielectric material layer, a first meandered strip, a second meandered strip and several bended strips. The first meandered strip is meandered in one direction and disposed on the dielectric material layer. The second meandered strip is meandered in another direction and disposed on the dielectric material layer. The first meandered strip is connected to the second meandered strip. The bended strips are connected to the turns of the meandered strips.
摘要:
A chip antenna has an antenna body and a package. The antenna body has multiple meandered metal lines and is encapsulated with the package. The material of the package is a dielectric composite formed with polymers and ceramic powders, which has a dielectric constant designed for the antenna. The characteristics of the chip antenna are determined by the structures of the antenna body and the dielectric constant of the package. Thus, a requirement for tiny structures in antenna applications can be satisfied.
摘要:
This invention provides a radio frequency identification (RFID) system comprising at least one reader module for radiating RF energy, a plurality of predetermined containers tagged by a plurality of RFID tags for receiving the radiated RF energy, wherein one or more containers are equipped with at least one conducting surface associated with at least one container side piece thereof so that when the plurality of the predetermined containers form a pile, an RF energy propagation channel network is formed comprising one or more propagation channels constructed by at least two conducting surfaces between two containers for confining and propagating the RF energy there-between.