- Buyers Guide
SP4T Nonreflective Switch
The model AS115-61 high isolation, SP4T nonreflective switch operates with 0 and -3 V or -5 V over the DC to 2 GHz frequency range. The switch delivers low insertion loss of 0.7 dB at 0.9 GHz with high isolation of 50 dB at 0.9 GHz, making it suitable for use in cellular base station switch matrices. The unit is supplied in a LQFP-32 plastic package.
(508) 628-4702, ext. 310.
The model MSN-32DR/DT-05 SP32T switch covers the frequency band of 0.5 to 18 GHz and is available in either reflective or absorptive versions. Insertion loss is 7.5 dB (max), SWR is 2 (max) and isolation is 60 dB (min) at 2 GHz and 70 dB (min) at 18 GHz (80 to 90 dB (typ)). Switching speed is 75 ns (typ) and 150 ns (max) for both delay on and delay off. Power supplies are +/-5 V with a positive current draw of 1.75 A (max) and negative current draw of 250 mA (max). Control is TTL compatible. Size: 7.7" x 3.5" x 1.0".
American Microwave Corp.,
Coaxial Bulkhead Adapters
The models 112532 and 122380 BNC and TNC bulkhead adapters allow for quick connection to cable jacks. The back-end design allows cable jacks to slide on quick and easy, making it suitable for field test procedures. TNC/BNC cable jacks are interchangeable with either adapter. The bodies are nickel plated with Teflon insulators and gold contacts.
60 Msps ADC
The model AD9051 10 bit, 60 Msps analog-to-digital converter (ADC) is designed for use in medical imaging, digital communications and cable television set-top boxes. The unit runs from a single +5 V supply and consumes 250 mW. Additional features include on-chip track and hold as well as a voltage reference. Fabricated on a state-of-the-art BiCMOS process, the ADC is packaged in a space-saving surface-mount package and is specified over the industrial temperature range of -40° to +85°C. Price: $8.50 (1000).
PCB-mount Miniature Switches
These DC to 3 GHz miniature switches include SP2T failsafe, transfer and bypass models. Designed to be PCB mounted, these 50 W impedance switches with actuating voltages of 12 or 28 V DC are suitable for use in microstrip applications. The units can be hot switched at 10 W CW and can handle up to 50 W CW. Insertion loss is 0.3 dB (max) and isolation is 70 dB (min). Delivery: stock to six weeks.
Dow-Key Microwave Corp.,
Chip-based Flange Terminations
These chip-based flange terminations are designed to handle high power while featuring a lower cost than typical rod-based equivalents. The model 42-1064 unit handles 10 W and features a socket contact, and the model 42-1065 unit also handles 10 W and features a tab contact. Both terminations are suitable for use from DC to 3 GHz.
Florida RF Labs Inc.,
Noiseless DC Heaters
The HD series DC heaters are designed for military applications and are fully screened to MIL-STD-883 with all-metal packaging, which eliminates the cracking, lead damage and thermal problems associated with berrylia-based heaters. The compact 0.750" x 0.500" x 0.185" units contain sensing, control and power circuitry. The 50° to 130°C temperature setting requires a single external resistor. The heaters' switching is sufficiently damped to prevent inducing noise spurs in the sensitive circuitry of surface acoustic wave (SAW) and yttrium iron garnet (YIG) oscillators.
General Microcircuits Corp.,
2 mm Backplane Assembly
The EYE-OPENER series 2 mm cable assembly is designed a for high data rate signal transmission up to 2 gigabits. The assembly increases the density of high fidelity signals in communications equipment while maintaining compatibility with standard backplane connectors. The cable assembly is available in differential as well as single-ended configurations with coax, twinax or twisted-pair cabling. The unit is fully scaleable in size and performance and provides high flexibility for ease of routing.
W.L. Gore & Associates Inc.,
SP1T PIN Diode Switch
The model S1P-69-3-3JH SP1T absorptive PIN diode switch operates from 2 to 18 GHz and is designed for high speed pulse modulation applications. Across the entire band SWR is < 2, insertion loss is < 3 dB and isolation is > 80 dB. The switch is capable of handling 0.5 W CW of RF power and operates on +5/-15 V DC at +/-50 mA power supply. Switching speed is 30 ns with video filtering of < 5 mV and TTL-compatible logic.
G.T. Microwave Inc.,
Surface-mount PIN Diode Switch
The model SWX-A09S switch module offers high power-handling capability in a small surface-mount package. The 1.55" x 1.75" x 0.40" switch operates at a frequency range of 130 to 155 MHz and has a switching speed of 20 ms (typ). Isolation is 20 dB (min) with an SWR of 1.5 (nom) at the highest power. RF input operating power is 100 W peak and insertion loss is 0.5 dB (max). The switch requires +5 V DC at +100 mA and -24 V DC at 10 mA and can be used in the -20° to +70°C temperature range.
(973) 887-8100, ext. 500.
The model SB-60/6 surface-mount filter is available in 50 or 75 W impedances and is centered at 60 MHz. Specifications include a 6 MHz (min) 0.5 dB bandwidth, 10 MHz (min) 3 dB bandwidth, insertion loss of 2.5 dB (max) and SWR of 1.5 (typ). Minimum rejection is 25 dB at 45 MHz, 17 dB at 50 MHz, 20 dB at 70 MHz and 40 dB at 75 MHz. Ultimate rejection is 40 dB to 2500 MHz. Size: 1.00" x 0.25" x 0.28". The filter is constructed with a FR-4 substrate and plastic shell for a high value, low cost solution.
K&L Microwave Inc.,
Low Profile, Right-angle SMA Connectors
The LoPro series low profile, right-angle connectors reduce the height required for a right-angle SMA connector and cable assembly to 0.498" above the connection plane. The units operate without moding from DC to 18 GHz and have an SWR of 1.2 (max). The connectors can be specified with the company's UTiFLEX series flexible cables with diameters of 0.092", providing a combination that serves as a good alternative to semirigid cable assemblies in any application. The units eliminate the need to specify cable assembly orientations on engineering drawings along with the cable forming required by semirigid cables.
High Power DC Block
The 500 W model HR-D22 high power DC block designed for VHF, UHF and cellular base stations provides DC and low frequency isolation of both inner and outer conductors while permitting unimpeded flow of RF signals. Similar models (HR-D08 and HR-D24) provide the same isolation but in the inner or outer conductor only. With a bandwidth that extends from 132 to 900 MHz, the unit is suitable for applications that require blocking of current surges that can occur on the surface during lightening storms and in subway tunnels when trains pass.
28.16 - 28.37 GHz Notch Filter
The model 12219 notch filter suppresses unwanted carriers contained in the output of the mixer in local multipoint distribution service (LMDS) transmitters and allows the broadcast of the desired 28.16 to 28.37 GHz passband. The unit has a notch frequency of 27.91 GHz and attenuation of 55 dB (min). Insertion loss is 0.5 dB (max) with a return loss of 16 dB (min) and ripple of 0.5 dB (p-p). Input level is -20 dBm (max), operating temperature is 0° to 50°C and humidity is 99 percent noncondensing. The unit is equipped with WR28 cover flanges. Other filter models up to 40 GHz are available.
Microwave Filter Co.,
East Syracuse, NY
(800) 448-1666 or (315) 438-4700.
5 - 1000 MHz Directional Coupler
The model JDC-10-4 directional coupler operates over the frequency range of 5 to 1000 MHz and delivers 10.5 +/-0.5 nominal coupling with +/-0.6 dB flatness. Midband mainline loss is a low 1 dB (typ) with high 23 dB (typ) directivity and good 1.15 SWR (typ). Maximum power input is 1 W. Solder-plated J leads provide good solderability and strain relief, and tape-and-reel packaging is available for fast, automated assembly. Size: 0.25" x 0.31" x 0.23". Price: $14.95 each (for 10 units or less). Delivery: one week.
Thick-film Chip Resistors
These thick-film chip resistors and resistor arrays are available with 0.1 percent absolute tolerances and ratio tolerances. The units are trimmed to provide low noise and ultra-stable resistance values between 1 and 100 kW with temperature coefficients of resistance to 100 ppm/°C. Available case sizes range from 1206 to 0504.
North Attleboro, MA
3.5 x 6.0 mm Surface-mount Crystals
The PQ, PP and PR series leadless, ceramic package, surface-mount crystals offer maximum heights of 1.00, 1.25 and 1.30 mm, respectively. The 3.5 x 6.0 mm crystals are designed for use in compact wireless telecommunications and portable electronic devices. Stability of +/-10 ppm over a temperature range of -20° to +70°C and frequencies up to 200 MHz are available in the PP and PQ series. Stability of +/-30 ppm over -20° to +70°C and frequencies up to 100 MHz are available in the PR series. Fundamental modes up to 45 MHz provide for flexibility of design in a variety of frequency control applications.
M-tron Industries Inc.,
(800) 762-8800 or (605) 665-9321.
Multi-octave Band Reject YIG Filter
The model M1743R band reject YIG filter is composed of eight stages covering the frequency range from 1 to 12 GHz. Out-of-band insertion loss is 1.5 dB (typ) with tuning sensitivity of 24 MHz/mA (typ). At 1, 8 and 12 GHz, rejection bandwidth is 5 MHz at 20 dB, 50 MHz at 40 dB and 100 MHz at 40 dB, respectively.
Santa Clara, CA
These MMCX connectors (including the model RFX-9010-1A right-angle plug for RG-178/U cable) are designed for use in applications where space requirements are small. The units can be used to terminate standard coaxial cables. Straight and right-angle styles are available in PCB, crimp plug and jack configurations. The rugged snap-in connectors are constructed of machined brass with nickel- or gold-plated bodies, gold-plated contacts and Teflon insulation.
RF Connectors, a division of RF Industries,
San Diego, CA
(800) 233-1728 or (619) 549-6340.
2 - 6 GHz Broadband Isolator
The model SMS2060 reduced-size 2 to 6 GHz connectorized isolator features one-quarter the volume of a standard model SMI-2060 and one-third the mass. The unit is designed to handle 10 W CW with 14 dB (min) isolation (15 dB (typ)) and 1 dB (max) insertion loss (0.6 dB (typ)) over a temperature range of -20° to +65°C. SWR is 1.5 (max) and 1.43 (typ). Size: 1.0" x 1.0" x 0.5".
Sierra Microwave Technology,
37 - 40 GHz Waveguide Isolator
The model WR3740T01 waveguide isolator operates over a frequency range of 37 to 40 GHz with an isolation of 23 dB (min). Insertion loss is 0.4 dB (max), SWR is 1.25 (max), power is 1 W (avg) and 500 W (peak), and operating temperature range is from -30° to +70°C. The unit's small size and narrow width (0.375" x 1.250" x 0.880") make the isolator suitable for use in tight-spaced digital radios.
QUEST Microwave Inc.,
Ceramic Dielectric Trimmer Capacitors
The GKU_ _ _10 series ceramic dielectric trimmer capacitors are designed for consumer and industrial applications requiring a 5 mm size trimmer for a two-hole printed circuit mounting layout. Nine models are available in capacitance ranges from 1 to 3 pF to 15 to 70 pF. The operating temperature range is from -25° to +85°C, voltage rating is 250 V DC, insulation resistance is 104 MW (min) and torque is 35 to 200 g-cm. All models feature low setting drift. Price: 35¢ each (1000). Delivery: stock to 12 weeks.
Sprague-Goodman Electronics Inc.,
These surface-mount impedance matching transformers on alumina substrate are available in a variety of combinations, including 50 W unbalanced to 50 W balanced center tapped, 50 to 75 W unbalanced and 50 W balanced to 112 W balanced center tapped over the frequency range of 100 kHz to 2000 MHz.
Technical Research and Manufacturing Inc. (TRM),
High Power RF Cable Assemblies
These coaxial cable assemblies are equipped with high integrity connectors for applications up to 10,000 V and 5000 W of RF power. The units feature positive-locking SQS Super Quick series connectors, which employ a spring-loaded retractable sleeve on the male that, when closed, forces self-contained balls to lock into a corresponding groove on the mating female connector. The assemblies are available in RG-217/U, RG-393/U and customer-specified cable types.
(800) 262-9878 or (978) 532-0775.
Miniature EMI Filters
The 4300 and 4400 series electromagnetic interference (EMI) filters are available in solder-mount or threaded bushing styles with capacitance values from 5 to 50,000 pF and an insertion loss of up to 70 dB at 1 GHz. Working voltage at 125°C ranges from 50 to 200 V DC. The EMI filters are available in C and L circuits and offer a variety of electrical performance characteristics as well as various lead options. Solder-mount styles have a diameter of 0.128" while threaded styles are available in 4-40 and M3 metric thread sizes.
Miniature Chip Duplexer
The model TDPF-836E-10 miniature chip antenna duplexer for Advanced Mobile Phone Service cellular telephones is designed to minimize insertion loss and reduce package size. The transmit side insertion loss is less than 2 dB (typ) and the receive side is less than 3.5 dB. The duplexer offers second and third harmonic rejection of greater than 30 dB. Its small 19.6 x 9.6 mm footprint saves board space for today's compact telephone models. Price: starts at $5.32 (1000).
Toko America Inc.,
Mount Prospect, IL
High Power Coaxial Termination
The model 1434 high power coaxial termination operates over a frequency range from DC to 2.5 GHz with nominal impedance of 50 W. The termination's power rating is 500 W (avg) at 25°C ambient temperature, derated linearly to 50 W at 125°C, and the operating temperature range is from -55° to 125°C. SWR is 1.1 (max) and connectors are type N male or female. The unit is composed of a black, finned aluminum body; stainless-steel connector; and gold-plated beryllium copper female contact or stainless-steel male contact. Weight: 8 lb (max).
(800) 638-2048 or (301) 831-4701.