摘要:
An antenna arrangement comprises a ground plane (14) and a planar antenna element (30) mounted spaced from and parallel to the ground plane. An open-ended slot (16) is provided in the ground plane (14), the slot being coextensive with an edge portion of the ground plane and having a first end (18) opening into the edge portion of the ground plane and a second closed end (20). An antenna feed (22) is coupled to the slot at a location intermediate the first and second ends. The planar antenna element is connected by an electrically conductive wall (28) to the edge portion of the ground plane, the wall (28) being coextensive with the slot (16). The combination of the slot shape, slot location and the wall serves to increase the bandwidth of the antenna arrangement.
摘要:
An antenna arrangement comprises a ground plane (14) and a planar antenna element (30) mounted spaced from and parallel to the ground plane. An open-ended slot (16) is provided in the ground plane (14), the slot being coextensive with an edge portion of the ground plane and having a first end (18) opening into the edge portion of the ground plane and a second closed end (20). An antenna feed (22) is coupled to the slot at a location intermediate the first and second ends. The planar antenna element is connected by an electrically conductive wall (28) to the edge portion of the ground plane, the wall (28) being co-extensive with the slot (16). The combination of the slot shape, slot location and the wall serves to increase the bandwidth of the antenna arrangement.
摘要:
A wireless terminal is described, which is formed from a module (20) comprising a substrate, RF components (32, 33), an antenna (25), notably of the PIFA type, and a linkage part (30) for linking the antenna to the substrate. The RF components are placed in the vicinity of the linkage part or even on the linkage part without degrading the operation of the antenna. By placing the RF components on this link, an area is made available for circuitry on the substrate.
摘要:
A wireless terminal includes a housing (10) containing a substrate (12) having a ground plane, RF components mounted on the substrate, a PIFA (Planar Inverted-F Antenna) (16) carried by the substrate and coupled electrically to the RF components for transmitting and receiving signals and a notch antenna (14) in the substrate for receiving signals in a frequency band at least partially overlapping the transmission bandwidth of some of the signals transmitted by the PIFA. The notch antenna is de-activated when the PIFA (16) is being used for transmitting a signal lying within the said transmission bandwidth.
摘要:
A catheter and a guidewire exchange system includes a catheter and a guide member. The catheter includes a lumen extending through the shaft and sized to receive the guidewire, and a longitudinal guideway enabling transverse access from the shaft exterior surface to the lumen. The guide member includes a housing, a catheter passageway extending through the housing and adapted to slidably receive the catheter, a guidewire passageway extending from one end of the housing into the catheter passageway and including a tube adapted to merge the guidewire transversely through the guideway and into the first lumen, and an fluid flow reduction body that is positioned in the guidewire passageway and impedes fluid flow therethrough.
摘要:
A wireless terminal having a dual band antenna arrangement which comprises a planar inverted-F antenna (10) having a first (12) for signals in a first, lower frequency band, for example the GSM band, a second feed (14) for signals in a second, higher frequency band, for example the DCS band, and a ground pin (16). A first coupling stage (26A) couples the transmit and receive paths of a first transceiver (GSM) to the first feed and a second coupling stage (26B) couples the transmit and receive paths of a second transceiver (DCS) to the second feed. Each of the first and second coupling stages comprise a quarter wavelength transmission line (50A, 50B) having a first end coupled to the respective transmit signal path and a second end coupled by band pass filter (52A, 52B) to the respective receive signal path. A first PIN diode (D1, D3) couples a transmit signal path to the first end of the respective quarter wavelength transmission line and to the respective feed (t2, t4) and a second PIN diode (D2, D4) couples the second end of the respective quarter wavelength transmission line to ground. In operation when transmitting in one of the bands, the first and second PIN diodes of the relevant coupling stage are switched-on, whilst the PIN diodes in the other coupling stage are off and when in a receiving mode all the PIN diodes are off. The signal being received by one of the transceivers is reflected by the band pass filter in the coupling stage of the other transceiver.
摘要:
A catheter and guide wire exchange system including a catheter that has a guide wire lumen with a guide way extending along a length of the proximal shaft. A guide member is slidably disposed about the proximal shaft for directing a guide wire into or out of the guide way and the guide wire lumen. A transition section joins the trilumen proximal shaft to a coaxial distal shaft.
摘要:
Convertible pants can include a waist portion, at least one leg connected to the waist portion, each leg including an upper leg portion and lower leg portion removably connected to the upper leg portion by a zipper, the zipper including an upper zipper track attached to the upper leg portion and a lower zipper track attached to the lower leg portion, and an upper zipper flap located on the upper leg portion proximate the upper zipper track, the upper zipper flap including a first reinforced portion extending substantially around the upper leg portion. The upper zipper flap can cover the zipper when the lower leg portion is connected to the upper leg portion by the zipper. A zipper system and garments incorporating the zipper system are also described.
摘要:
An endovascular prosthesis includes a tubular body and a mobile external coupling. The tubular body includes a graft material and stents coupled thereto, a forms a lumen therethrough. The mobile external coupling extends outwardly from the tubular body. The mobile external coupling includes a graft material and is generally frustoconically shaped. The mobile external coupling includes a base coupled to the tubular body, a top spaced from the tubular body, and a coupling lumen disposed between the base and the top, wherein the coupling lumen is in flow communication with the body lumen. A cylindrical sealing cuff of graft material is attached to and extends from the top of the mobile external coupling towards the tubular body within the coupling lumen. The sealing cuff is configured to contact a portion of a branch vessel prosthesis and thereby provides an elongated interference seal between the branch vessel prosthesis and the mobile external coupling.