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 Passive Components Apr 1, 2005 12:00 PM Panel antennas
Pacific Wireless has announced the release of the RooTenna line. The RooTenna58 wideband panel antenna is developed to allow integration of the customers' radio equipment inside the weatherproof compartment. The antenna features a frequency range of 5150 MHz to 5825 MHz with 19 dBi of gain. It may be mounted for vertical or horizontal polarization and features a balanced 16° beamwidth. The RooTenna58 radio compartment is big enough to house transceivers, amplifiers and other electronic equipment. Two sizes are available: the regular RooTenna and a new low-profile RooTenna, which is offered in standard gray or white housing. Many connector options are available: RPSMA, RPTNC, MC Card, MMCX, RPMMCX and U.FL. Thin film chip resistors
Venkel Ltd. has introduced a line of Ultra Precision Thin Film Chip Resistors (UPTF series) that have temperature coefficient of resistance (TCR) as low as 5 ppm. The tolerance on these chip resistors can be as low as ±0.01% for all sizes. UPTF chip resistors provide exceptional precision and stability in various circuit applications. The precision thin film chip resistors are available in sizes 0402 through 1206. The resistance ranges from 10 Ω to 500 KΩ. 0402's are available with values up to 100 KΩ, and the 0603 size has also been expanded to include values up to 150 KΩ. 0805 and 1206 sizes are available with values up to 500 KΩ. The operating temperature ranges from -55° C to +150° C for these chip resistors, and they are suitable for flow and reflow soldering. Wire-wound chip inductor
Taiyo Yuden Inc. has announced the CBC3225-4R7MR, a wire-wound chip inductor with a 1000 mA (1A) current rating in an EIA standard 1210 case size. Designed specifically for space-critical dc/dc converter choke coil applications in battery-powered portables, the 4.7 uH-rated CBC3225-4R7MR's 3.2 mm × 2.5 mm footprint provides an almost 70% surface-area reduction compared to comparably rated power inductors that typically require up to 25 mm Cell Reach cable connectors
CommScope Inc. has announced a two-piece connector that improves transmission performance while reducing on-site termination time. The 1873 B-series connector and 1873 PT cable preparation tool are engineered to provide effective cable-to-connector interface when properly installed. Both new products are designed for 1⅝-inch Cell Reach cables. The 1873 PT cable preparation tool, which provides consistent termination and reduces on-site craft issues, is a two-piece coring tool designed specifically for the 1873 B-series connector. The B-series two-piece connector creates a tight seal to prevent moisture ingress and meets the International Electrotechnical Commission publication 529, IP68 test. Coaxial cable assemblies
Ku-flex is a range of durable microwave coaxial cable assemblies for the Ku-band frequency range (12 GHz to 18 GHz) from Gigatronix. The cable has been developed for 50 Ω applications to 18 GHz where consistent high-performance characteristics, flexibility and low loss are critical. Incorporating a flexible alternative to RG402 (141) and RG405 (086) semi-rigid cables, they remove the requirement for hand or precision bending and forming equipment while still maintaining the durability and performance characteristics commonly associated with semi-rigid cable assemblies. All Ku-flex cable assemblies have a double- screened, silver-covered copper tape and braid construction that provides low passive intermodulation and comparable shielding effectiveness and power handling to that of RG402 and RG405 semi-rigid cables. The cables have a fluorinated ethylene propylene (FEP) jacket, a PTFE dielectric and silver-plated solid center conductors. Ku-flex 402 cable assemblies have attenuation per meter of 2.10 dB at 18 GHz, while the 405 versions have attenuation per meter of 3.23 dB per meter at 18 GHz. Both assemblies have typical return loss characteristics of better than 20 dB at 18 GHz. Ku-flex microwave cable assemblies are available terminated with gold-plated SMA connectors or tri-alloy-plated N type connectors, both of which are held ex-stock to reduce manufacturing lead-times. Typically, assemblies are available for any length requirement within five to seven days without any minimum order quantities. Dual-band antenna
PCTEL Antenna Products Group Inc. has added a dual-band elevated feed antenna model to its Antenna Specialists brand of land-mobile radio antennas. The ASPDM913U is designed to provide optimal coverage of both cellular and PCS frequencies with 3 dB of gain and without a ground plane. Featuring a 3/8"-24 ferrule stud adaptable to standard mirror bracket mounts, side-body mounts, and shock springs, this antenna is suitable for commercial delivery truck applications using both cellular and PCS networks. Its no-ground-plane, elevated feed design provides 3 dB gain performance for optimal omnidirectional coverage, and its rugged construction easily withstands high vibration conditions in most trucking applications. The Antenna Specialists ASPDM913U no-ground-plane, elevated feed, 3 dB gain antenna is available through the PCTEL Antenna Products Group's network of authorized distributors. Flexible electrical conduits
Electri-Flex Company offers three types of Liquatite flexible electrical conduits with EMI/RFI shielding. These liquid-tight conduits permit traditional wiring solutions in shielding applications. They protect sensitive electronic circuits in applications such as communications, radar and data transmission. All versions are designed to accept industry-standard liquid-tight connectors and to address assembly and grounding. Electri-Flex's Liquatite EMI/RFI shielding conduit is available in three types. Type EMS offers a shielding effectiveness from 126 dB at 1 MHz to nearly 100 dB at 1 GHz with a temperature rating of -55° C to 105° C. EMS features a flexible core constructed of a helically wound, interlocked strip of bronze. An all-temperature PVC jacket is extruded over the core, resulting in a sealed, waterproof raceway when assembled with liquid-tight fittings. Type LAS, UL-listed, is a flexible steel conduit with a galvanized steel core, over which a tinned copper shielding braid is applied. The outer jacket is flexible PVC with a temperature rating of -20° C to 60° C with a shielding effectiveness from 126 dB at 1 MHz to 66 dB at 1 GHz. Type EMSP is a hybrid of LAS and EMS, but gets further screening protection from a tinned copper shielding braid under the flexible jacket. With the same working temperatures as EMS, EMSP's shielding effectiveness ranges from 126 dB at 1 MHz to 120 dB at 1 GHz. Rugged coaxial attenuators
Vista RF Inc. has introduced a line of off-the-shelf, economical rugged coaxial attenuators designed for broadband applications in commercial and defense frequency bands. The VSA series of fixed attenuators operate from dc up to 6 GHz and are offered in economical brass and durable, stainless-steel versions. The 2 W VSA-MB product line is offered in an SMA male-to-female housing and features all-brass construction. It is available in attenuation values from 1 dB to 10 dB in 1 dB increments, as well as fixed values of 15 dB, 20 dB and 30 dB, all with ±0.3 dB flatness and with a typical VSWR of 1.15:1 across the band. The VSA-MS is a 2 W SMA male-to-female attenuator constructed of stainless steel and available in attenuation values from 1 dB to 10 dB in 1 dB steps, as well as fixed values of 15 dB, 20 dB and 3 0dB, all with ± 0.3 dB flatness and 1.15:1 typical VSWR across the band. The VSA-N product line is offered in an N-type male-to-female housing, in two different materials. The VSA-NB is constructed with a brass body and is available in 10 dB to 30 dB versions in 5 dB increments with a 3 W and 5 W power-handling capability. All of these models exhibit a ± 0.3 dB flatness and a typical VSWR of 1.20:1 across the band. The VSA-NS has a housing constructed of stainless steel and is available from 10 dB to 30 dB in 5 dB increments with a 5 W power-handling capability. The VSA-NS models exhibit ±1.0 dB flatness and a typical VSWR of 1.20:1 across the band. Connectors, cable prep tools
Times Microwave Systems has introduced a series of EZ style connectors and cable prep tools for use with LMR-240 low-loss cable. The QMA male, QMA male RA, SMA male, SMA male RA, and N male EZ non-solder connectors are available for LMR-240 and widely used with True Position E911 installations. These connectors are rugged and have been optimized for ease of termination and have excellent electrical performance. Each connector is supplied with an adhesive-lined ATUM boot and detailed termination instructions.The ST-240EZ tool prepares the cable to the exact dimensions in one simple step, while the DBT-02 too l removes the burrs from the exposed center conductor, facilitating field installation of the EZ non-solder connectors. Small form-factor RF connector
Corning Gilbert has introduced a small, push-on, high-performance, microwave interconnect system. The G3PO connectors can support increased package density due to a center-to-center pitch of 0.085 inch minimum, as well as a PCB-to-PCB stack height of 0.120 inch minimum. The connectors cover the frequency range from dc to 65 GHz. Typical VSWR is 1.1:1 to 26.5 GHz and 1.25:1 to 65 GHz. The design makes allowances for radial and axial misalignment with negligible VSWR change and is capable of meeting environmental requirements in accordance with MIL-PRF-39012. The G3PO standard blind-mate interconnect, part number R1R1-0001-01, weighs only 0.2 milligrams. The G3PO product line includes custom blind-mate interconnects, edge-launch and surface-mount connectors, cable connectors — male and female — multiposition blocks in various sizes and detents and hermetic and load connectors. Polarized sector antenna
Pacific Wireless has released its 2.4 GHz 180° vertically polarized sector antenna. The 180° sector antenna system is constructed of a UV stable fiber glass radome for long service life in demanding conditions. The 10° vertical beamwidth allows for good consistent signal coverage from 0 miles to more than 12 miles. The light gray color blends well in most any environment. The 12 dBi sectors are equipped with an integrated N female connector and come with a ±10° stainless steel tilt bracket system for ease of installation and alignment. The antennas can be mounted anywhere along the length of a mounting pole, which increases installation flexibility. Radar pulse antennas
AR Worldwide has introduced two radar pulse antennas to address the high-pulsed field level requirements at the highest microwave frequency bands and the lowest microwave frequency bands. When used in conjunction with the AR Worldwide model 500T2G8 Traveling Wave Tube microwave amplifiers, each of the antennas will provide the 600 V/m pulses field level with approximately 3 dB margin to accommodate expected system losses.
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