Abstract:
An array antenna comprises a first substrate comprising a first plurality of ceramic layers; a second substrate comprising a second plurality of ceramic layers; a bottom ground plane stacked on the bottom of the second ceramic substrate; a plurality of quasi-cavity-backed patch antennas mounted on a top surface the first substrate, each of the patch antennas including a radiating element and two grounded grid-like conductor walls; and a mixed feeding network coupled to each of the patch antennas. The array antenna working at mm-wave frequency band can provide high radiation efficiency and low loss from feeding network by using quasi-cavity-backed patch elements and a mixed feeding network configuration.
Abstract:
One embodiment of the present invention includes a structure that defines at least a transition interior, the structure including electrically-conductive materials, the structure defining first and second openings to the transition interior, the first opening configured to be open toward a first interior, of a first waveguide, which is a laminated waveguide, and the second opening configured to be open toward a second interior, of a second waveguide, the second interior being defined by an electrically-conductive structure of the second waveguide, whereby an electromagnetic wave is capable of being propagated via the transition interior, from one of the first and second interiors to the other of the first and second interiors, wherein content of the first interior has a dielectric constant that differs from a dielectric constant of content of the second interior, and the second waveguide is not laminated on the substrate on which the first waveguide is laminated.
Abstract:
A compact inverted-F antenna having a radiator arm formed from portions disposed in two parallel spaced apart planes and connected together electrically to form a folded meander-line topology. The planes may be defined by the surfaces of a dielectric substrate and the radiator arm may be formed from upper and lower conductive traces printed on either side of the dielectric substrate and interconnected serially through filled via holes. The antenna includes a ground plane parallel to and spaced apart from the radiator arm. The ground plane may be a grid conductive wall formed from filled via holes through the dielectric substrate.
Abstract:
A microwave circular waveguide cavity and filter containing said cavity has a circular iris mounted transversely within the cavity. The iris has an eccentrically located circular aperture that is sized and located to control coupling between modes resonating in the cavity. The cavity can be a dual mode cavity, a triple mode cavity or a higher mode cavity. In a method of constructing such a cavity, coupling can be controlled by choosing from a number of variables including the size of the aperture, the offset distance, the inclination angle, the thickness and the location of the iris within the cavity.
Abstract:
Disclosed is a transition apparatus for transitioning wide frequency band electromagnetic waves between the metal waveguide and the laminated waveguide. The transition apparatus includes a top conductive layer, a bottom conductive layer, a conductive wall, and a transition interior. The conductive wall is formed along a substrate of the laminated waveguide and electrically connected the top conductive layer and the bottom conductive layer. The transition interior is defined by the top conductive layer, the bottom conductive layer, and the conductive wall. The conductive wall further comprises a plurality of stubs extending from an inner side of the wall into the transition interior, the plurality of stubs divide the transition interior into three or more resonator cavities for transitioning wide frequency band electromagnetic waves between the metal waveguide and the laminated waveguide.
Abstract:
A method of operating an RFID system and an RFID system in a power-saving mode are disclosed. In one embodiment, the system comprises at least one reader and at least one tag. The at least one reader may transmit a wake-up signal to the at least one tag when turning on, and the at least one tag stays alternatively in a sniff mode and a sleep mode at an alternative period before receiving the wake-up signal. The method may comprise modulating the wake-up signal by using N time markers.
Abstract:
A method and an apparatus for obtaining an equivalent circuit model of a multi-layer circuit are disclosed. The method includes simulating the multi-layer circuit using an electromagnetic field analysis to provide a coupling network; and simplifying the coupling network using a circuit model order reduction method to generate the equivalent circuit model. The method is very simple to implement and the equivalent circuit model obtained has an apparent physical meaning.
Abstract:
An array antenna comprises a first substrate comprising a first plurality of ceramic layers; a second substrate comprising a second plurality of ceramic layers; a bottom ground plane stacked on the bottom of the second ceramic substrate; a plurality of quasi-cavity-backed patch antennas mounted on a top surface the first substrate, each of the patch antennas including a radiating element and two grounded grid-like conductor walls; and a mixed feeding network coupled to each of the patch antennas. The array antenna working at mm-wave frequency band can provide high radiation efficiency and low loss from feeding network by using quasi-cavity-backed patch elements and a mixed feeding network configuration.
Abstract:
A compact inverted-F antenna having a radiator arm formed from portions disposed in two parallel spaced apart planes and connected together electrically to form a folded meander-line topology. The planes may be defined by the surfaces of a dielectric substrate and the radiator arm may be formed from upper and lower conductive traces printed on either side of the dielectric substrate and interconnected serially through filled via holes. The antenna includes a ground plane parallel to and spaced apart from the radiator arm. The ground plane may be a grid conductive wall formed from filled via holes through the dielectric substrate.
Abstract:
A method and an apparatus for obtaining an equivalent circuit model of a multi-layer circuit are disclosed. The method includes simulating the multi-layer circuit using an electromagnetic field analysis to provide a coupling network; and simplifying the coupling network using a circuit model order reduction method to generate the equivalent circuit model. The method is very simple to implement and the equivalent circuit model obtained has an apparent physical meaning.