Fixed Attenuators Cover DC to 6 GHz
The N5405-XX series of fixed attenuators operate from DC to 6 GHz and can be specified with attenuation values of 1 to 60 dB. The handle 5 W continuous input power and as much as 250 W peak input power over the full frequency range. Insertion loss is only 0.5 dB for attenuation values to 20 dB and no more than 1.5 dB for attenuation values to 60 dB. The maximum VSWR is 1.15:1 from DC to 4 GHz and 1.20:1 from 4 to 6 GHz. The rugged attenuators are available with stainless-steel Type-N or SMA male or female coaxial connectors.
ARRA Inc., 15 Harold Court, Bay Shore, NY 11706-2296; (516) 231-8400.
SMT Filters Serve Telemetry Applications to 6 GHz
A line of surface-mount-technology (SMT) filters has been developed for telemetry applications over a typical frequency range of 250 MHz to 6 GHz. The filters exhibit less than 1-dB insertion loss at the passband center frequency and better than 14-dB return loss across the passband. The minimum out-of-band signal rejection is 60 dB. Each filter is housed in a compact surface-mount enclosure measuring just 1.50 x 0.30 x 0.20 in. for achieving small printed-circuit-board (PCB) layouts. The filters handle operating temperatures from -25 to +85°C without performance degradation.
Amp Module Boosts Signals to 18 GHz
Designed for high efficiency (better than 14% DC-to-RF efficiency), model BME69188-50 is a broadband power amplifier (PA) module capable of 50 W output power from 6 to 18 GHz. Based on gallium-nitride (GaN) active device technology, the Class-AB linear PA module delivers 47 dB gain with +/-4 dB gain flatness across the full frequency range. The input overdrive level is +10 dBm. The maximum input/output VSWR is 2.0:1. Spectral purity is excellent, with second harmonics of -15 dBc, third harmonics of -25 dBc, and spurious levels of -60 dBc. Suitable for boosting signals in communications, electronic-warfare (EW), and radar systems, the PA module features built-in test functions, including over temperature, over current, and composite test capabilities. It runs on a +28-V dc supply and has TTL-controlled enable/disable function with 1-μs switching speed. The amplifier measures 6.56 x 3.50 x 0.84 in. and weighs 1.5 lb. with field-replaceable female SMA RF input and output connectors. It handles operating temperatures from -40 to +55°C.
Comtech PST, 105 Baylis Rd., Melville, NY 11747; (631) 777-8900.
Capacitors Handle Temperatures to +200°C
The HiT line of multilayer ceramic capacitors (MLCCs), marketed under the brand names of Novacap and Syfer Technology, has been designed to take the heat—specifically, for an operating temperature range of -55 to +200°C. Available with capacitance values from 4.7 pF to 3.3 μF, they feature tin-over-nickel terminations for high reliability at high temperatures. They are rated for voltages from 16 to 630 V dc and are RoHS compliant and lead free. They are fabricated with extremely stable dielectric materials, using a unique screen printing process. The capacitors are suitable for automotive, avionics, geothermal, and military applications.
, Old Stoke Rd., Arminghall, Norwich, Norfolk, NR14 85Q, UK; +44 (0) 1603 723310.
L-Band Dividers Go Two and Four Ways
A line of stripline power dividers has been extended to include two- and four-way Wilkinson power dividers for L-band applications. The additions include model 802-2-1.500-M01 (a two-way divider for use from 1 to 2 GHz) and model 804-2-1.500-M02 (a four-way divider with the same frequency coverage). The rugged components both feature minimum isolation of 20 dB with maximum insertion loss of 0.3 dB. The amplitude balance across the 1-GHz bandwidth is no worse than +/-0.3 dB.
MECA Electronics, Inc., Denville, NJ 07834; (866) 444-6322, e-mail: [email protected].
Coaxial Highpass Filter Rejects Below 700 MHz
Microwave Filter Co.
For rejecting signals below 700 MHz, model 18536 is a coaxial highpass filter with low-loss passband from 746 to 894 MHz with passband insertion loss of 1 dB. The passband return loss is 14 dB or better, while out-of-band rejection is 40 dB or more from DC to 700 MHz. The passband amplitude flatness is no worse than within 1 dB and typically within 0.5 dB. Weatherized for outdoor use, the filter measures 5.25 x 3.55 x 1.64 in. (133 x 90 x 42 mm) and has an operating-temperature range of -10 to +50°C. It is available with standard female DIN connectors and, as an option, female Type-N connectors.
Microwave Filter Co., Inc., 6743 Kinne St., E. Syracuse, NY 13057; (800) 448-1666, (315) 438-4700.
GaN Power Amplifier Boosts 2 to 6 GHz
Compact model PE15A5025 is a coaxial GaN power amplifier capable of 50 W saturated output power (+47 dBm) from 2 to 6 GHz. Suitable for commercial and military radar and communications systems, the amplifier provides 50-dB small-signal gain and 30% power-added efficiency (PAE). Harmonics are -15 dBc, while spurious levels are held to -70 dBc. The amplifier is unconditionally stable from a +28-V dc supply. It uses female SMA input and output connectors, incorporating voltage regulation, bias sequencing circuitry, TTL control, DC current monitoring, and over-temperature shutdown at +90°C baseplate temperature. It is designed for operating temperatures from -40 to +85°C.
Pasternack Enterprises, 17802 Fitch, Irvine, CA 92614; (949) 261-1920, (866) 727-8376.