- Buyers Guide
GaAs IC Digital Attenuator
The model AD 210-25 attenuator designed for wireless communications applications offers good power control reproducibility in 1 dB steps to 15 dB and repeatability of ±0.25 dB +5 percent of the attenuation setting. The unit offers low insertion loss of 1.3 dB (typ) at 900 MHz. Third-order intercept point (IP3) is 48 dBm at 500 MHz. The attenuator is available in an SOIC-16 leaded SMT package. Price: $4.40 (10,000).
(800) 290-7200, ext. 309 or (508) 628-4702, ext. 309.
This personal communications service (PCS)1900 triplexer provides isolation of 80 dB (min). Insertion loss is minimized to < 0.5 dB. The triplexer is available in 5, 15 and 25 MHz bandwidths. Personal communications network (PCN) and application-specific designs are available. Size: 8.00" x 4.00" x 1.30".
ClearComm Technologies Inc.,
These quartz crystals operate on the fundamental mode at 55.2 MHz and with the Motorola CopperGold ADSL" transceiver model MC145650." The crystals are available in thru-hole or surface-mount packages and operate over a -25° to +75°C temperature range at a ±20 ppm frequency stability. Frequency deviation is ±150 ppm from 8 to 24 pF.
10 MHz - 20 GHz Switched Filter Bank
This switched filter bank comprises 10 filters and a state-of-the-art SP10T switching network. The unit's compact size and design are applicable to wideband frequencies up to 40 GHz. This capability also can be applied to mutliplexers.
The HD series DC heaters are designed for military applications and are fully screened to MIL-STD-883 with all-metal packaging, eliminating the cracking, lead damage and thermal problems associated with berrylia-based heaters. The 50° to 130°C temperature setting requires a single external resistor. Switching is damped sufficiently to prevent inducing noise spurs in the sensitive circuitry of the surface acoustic wave and yttrium iron garnet (YIG) oscillators. Size: 0.750" x 0.500" x 0.185".
General Microcircuits Corp., a subsidiary of General Microwave Corp.,
3.4/3.5 GHz WLL Bandpass Filters
These transmit and receive ceramic bandpass filters designed for use in 3.4 and 3.5 GHz wireless local loop (WLL) applications incorporate high performance in a small package, offering a reduced footprint on the circuit board. The transmit filter (3420 to 3441 MHz) features rejection of 30 dBc at 3520 and 3541 MHz (typ) with 3 dBa insertion loss. The receive filter (3520 to 3541 MHz) features rejection of 25 dBc at 3420 and 3441 MHz (typ) with 2.3 dBa insertion loss. SMT or thru-hole configurations are available. Units are reflowable, suitable for pick and place or available with tape-and-reel packaging.
Integrated Microwave Corp.,
San Diego, CA
The model DBD 80200-1 dual-band diplexer designed for cellular and PCS applications combines high interchannel isolation with low insertion loss. The unit also combines cellular band signals in the 800 to 900 MHz band with PCS signals in the 1800 to 2000 MHz band. Features include an insertion loss of less than 0.7 dB, SWR of 1.4 and isolation of greater than 70 dB. Connectors are type N female. Size: 4.0" x 2.5" x 2.5". Weight: 1.1 lb.
ITS Electronics Inc.,
Concord, Ontario, Canada
BNC 50 W Coaxial Cable
The model 6253 50 W coaxial cable allows secure retention with the convenience of a push-on connector. The cable has a locking feature that assures secure connections even in installations where twisting is severely limited or restricted. The unit is a BNC male coaxial cable assembly with insulated push-on connectors at both ends and is rated at 500 V RMS (max), +50°C (max). Flexible strain reliefs that are molded to the cable jacket restrict bending to prevent impedance changes. The BNC connector features high quality materials, including a polytetrafluoroethylene (PTFE) insulator for broad temperature range, gold-plated center pin for low contact resistance and nickel-plated body for tarnish resistance. The push-on connectors eliminate the need for twisting, which extends the product life. Price: $28.50 each.
ITT Pomona Electronics,
Pomona, CA (909) 623-3463.
Circle No. 226
4P3T Electromechanical Switch
The model MM4 four-pole, triple-throw (4P3T) electromechanical switch is designed for cell sites with three antennas each receiving or transmitting over 120° or one-third of the coverage area for cellular telephone carriers or wireless applications. The switch features three inputs and three outputs with one redundant port. The switch replaces one SP3T and three SPDT switches or three transfer switches. The unit connects the input of four amplifiers with three signal sources and the output of four amplifiers with three antennas.
Jay-El/DMT, RF/Microwave and Illuminated Products,
Lowpass Filter Chip
The model LC series filter inductor-capacitor network incorporates a ladder network of inductors and capacitors, a design concept that provides superior electromagnetic interference filtering compared to conventional T-type designs or discrete ladder solutions. The network is a lowpass filter with monolithic construction in a 1206 case size suitable for Personal Computer Memory Card International Association (PCMCIA) cards. The chip features a characteristic sharp cutoff at the designated frequencies without bounce back. Cutoff frequencies offered include 10, 22, 47 and 100 MHz. The chip requires no special placement orientation and is suitable for circuits where steep insertion loss is required and for situations where continuous attenuation is required well beyond the cutoff point. Price: 20¢ each (100,000). Delivery: stock to 12 weeks (ARO).
BI Technologies Corp.,
High Frequency/Low Loss Lowpass Filter
The model 62L50-1550/31000-0/0 high frequency, low loss lowpass filter features a pass band of 12 to 15.5 GHz with a pass band insertion loss of less than 0.2 dB. The filter offers a good return loss of 17.7 dB over the pass band. Rejection of 40 dB to 39 GHz is obtained easily. The filter's small size allows it to be adapted into cable assemblies easily. Delivery: four weeks (ARO).
K&L Microwave Inc.,
The PSA series pill attenuators operate from DC to 12.4 GHz and are well suited for installation in stripline circuits. The units' good temperature stability and reliability also make them suitable for high reliability applications. The units are laser trimmed, have a proprietary thin-film resistive element and are encapsulated in an epoxy. The attenuators have a resilient spring configuration that provides positive ground-plane contact regardless of variations in ground-plane spacing tolerances. Attenuation accuracy is ±0.5 dB (typ) across the entire frequency range. Other features include an SWR of 1.25 at 4 GHz, 1.35 at 8 GHz and 1.5 at 12.4 GHz; impedance of 50 W; and temperature range of -55° to +150°C. Delivery: stock to 30 days (max).
KDI/triangle Corp., an MCE company,
(973) 887-8100, ext. 500.
High Power Circulator
The model C3N205/30 high performance circulator is designed for broadcasting applications. The unit operates from 190 to 220 MHz with a power rating of 1200 W. Typical isolation is 22 dB with a maximum SWR of 1.2 and insertion loss of 0.4 dB. Operating temperature is 0° to +85°C. Various frequency ranges and bandwidths are offered with type N connectors standard.
Microwave Devices Inc.,
High RF/DC Isolation Bias Tee
The model BT-C6-411 connectorized bias tee offers a high RF/DC isolation of 40 dB (min). With an operating frequency band of 500 to 2500 MHz, the bias tee covers the popular PCS, cellular and local area network wireless bands. The unit is provided in a standard 1.25" square package with either SMA or type N connectors.
Pulsar Microwave Corp.,
Programmable Fiber-optical Delay Line
This high performance 4-bit programmable delay line uses low noise fiber-optical transmitters, receivers and low loss optical switches that operate at microwave frequencies. The switches are connected to a computer-controlled network to adjust the delay from 0 to 18.75 ms. The delay is set with 4-bit resolution with the internal microcontroller. The delay line houses a compact fiber-optic link with better than 132 dB/Hz dynamic range and has a system noise of less than 38 dB. The delay line has a triple-transit response of better than -75 dBc, an output of +8 dBm at 1 dB compression point (P1dB) and an output IP3 of better than +13 dBm. Gain is 7 dB and is essentially flat across the full operating range for a given delay time. The 2.25 to 2.55 GHz modulation frequency can be custom altered.
Princeton Electronic Systems Inc. (PES),
Multiple-output DC/DC Converter
The model LTC1439G dual-output synchronous switching regulator controller in a new 36-lead narrow SSOP operates over an input voltage range of 3.5 to 36 V with efficiencies up to 95 percent. The unit has a 99 percent duty cycle capability for low dropout operation while driving N-channel MOSFETs. This capability allows the input voltage to drop close to the output voltage and maintains good regulation, extending operating time of portable equipment running on deeply discharged batteries. The converter's Adaptive Power mode allows automatic switching between two output stages sized for different load currents by selectively driving two N-channel MOSFETs at frequencies up to 400 kHz. This process reduces switching losses to maintain high efficiencies at low output currents. The unit is suitable for use in notebook and palmtop computers, portable instruments, wireless communications and any DC power distribution system where saving PCB space is essential. Price: starts at $7.65 (1000). Delivery: stock.
Linear Technology Corp.,
(408) 432-1900, ext. 2359.
SMA Cellular Hybrid
The model THS-09-03 SMA cellular hybrid operates over the 800 to 960 MHz frequency band, offering insertion loss of 0.2 dB, SWR of 1.29 (max) and isolation of 20 dB (min). Average power handling is 350 W CW. Typical applications for this device include combining stages within balanced amplifiers as well as providing channel paths between transmitters, receivers and antennas. Size: 2.75" x 0.51" x 0.66" (not including the four SMA connectors).
Sage Laboratories Inc.,
High Voltage DC/DC Converters
The MM series proportional DC/DC converters are designed specifically for direct PCB mounting and provide high reliability in four package sizes with output voltages from 300 V to 15 kV at 1.5 or 2.5 W. Reversible models are available up to 15 kV with an output power of 1.5 W. All models are designed with standard input voltages of 9, 12 or 24 V DC and input currents less than 1 A at full output. Other input voltages and multiple outputs can be custom ordered. The converters feature built-in arc protection and all models can be used with an external feedback loop to provide regulated outputs. The units are suitable for use in a variety of applications, including detectors, mass spectrometers, flow sensors, analytical and biotechnology instruments, spectral source lamps, ink jet printers, gas chromatography and other high voltage applications where space is at a premium. Price: $55 each. Delivery: stock to six weeks.
Spellman High Voltage Electronics Corp.,
Band Reject YIG Filter
The model M1664R multi-octave band reject YIG filter comprises six stages covering the frequency range of 2 to 6 GHz. Fifty-decibel rejection bandwidth is 60 MHz (min) at 6 GHz, 12 MHz at 2 GHz. The out-of-band insertion loss is 1.3 dB (typ) and tuning sensitivity is 24 MHz/mA (typ). The unit is suitable for electronic countermeasure systems, spectrum analyzers, and other microwave systems and equipment for rejecting unwanted incoming RF signals or spurious responses. The filter provides analog or TTL 12-bit digital drivers as integrated devices with YIG components. The operating temperature range is from -54° to +85°C built to MIL-E-5400 specifications.
Santa Clara, CA
Open-carrier Mixers and Frequency Doublers
These open-carrier mixers and frequency doublers are designed for use in microwave telecommunications links. The units cover the frequency range to 16 GHz, have an LO drive from +7 to +20 dBm and feature a low cost microstrip interface.
Stellex Microwave Systems,
Palo Alto, CA
Compact Chip Attenuators
These compact, lightweight chip attenuators are suitable for use in RF applications, such as base stations and antennas, and in microwave applications where reduction in an electrical signal is required, such as in power dividers and power amps. The devices are available with attenuation factors of 1 to 20 dB in 0.5 dB increments. The attenuators' frequency range is from DC to 18 GHz with SWR as low as 1.2, depending on size, style and frequency. Available tolerances are ±0.5 and ±1 dB. The components are available in two standard case sizes: 0.100" x 0.050" x 0.015" and 0.150" x 0.125" x 0.015". Price: $1.25 each. Delivery: eight to 10 weeks (ARO).
State of the Art Inc. (SOTA),
State College, PA
The model RSA-3010-C subminiature connector is part of the company's subminiature line of SMA, SMB, MB, MCX and miniature pin plugs and receptacles. This right-angle SMA male crimp plug for RG-58/U cable features Teflon insulation, a gold contact and a nickel-plated body. It is designed for simple assembly and installation, and can be used for several coaxial cables, including RG-58, -141 and -400/U; Belden 8219, 8240, 8259, 8262, 9201, 9203, 9310 and 9311; Comm/Scope 0268; Cushcraft Ultralink TL92463 and TL92887; Intercomp 4585A; and Time Microwave LMR-195.
RF Connectors, a division of RF Industries,
San Diego, CA
Blind Mate Connectors
These blind mate connectors offer the advantage of push-on mating while providing for miniaturization through a modular design by eliminating cumbersome cable assemblies. A spring-loading mechanism allows for axial and radial misalignment. Available interfaces include BMA per MIL-STD-348 (compatible with OSP), BMZ per MIL-STD-348 (compatible with PMMA), BZ (compatible with PMA) and push-on SMA (compatible with standard SMA). Configurations include semirigid and flexible cable connectors; hermetic versions and adapters; fixed and floating versions; low profile styles; high power versions; stripline and microstrip launchers; adapters between series; and terminations.
West Palm Beach, FL
These power dividers cover the frequency range of 0.5 to 18 GHz in octave or multi-octave bands and offer low loss, high isolation, good phase and amplitude matching, and compact, low profile outline packages.
Universal Microwave Components Corp. (UMCC),
Subminiature Directional Couplers
The CA series stripline directional couplers from KDI/triangle Corp. are available as single-range units covering 500 MHz to 18 GHz and octave ranges to 18 GHz. In addition, the couplers are available with coupling values of 6, 10, 20 and 30 dB, and have minimum directivity of 22 dB to 2 GHz, 20 dB to 4 GHz, 17 dB to 12.4 GHz and 14 dB to 18 GHz, respectively. Accuracy, including frequency flatness, is 0.75 dB or better over octave bandwidths, isolation is 20 dB (typ) and insertion loss is less than 0.2 dB. SWR is 1.4 in the 4 GHz model, 1.25 in the 8 GHz model, 1.3 in the 12 GHz model and 1.45 in the 18 GHz model. Average power-handling capability ranges from 20 to 50 W and peak power-handling capability is 3 kW. All models in the series operate over a temperature range of -55° to +85°C and meet MIL-E-5400 specifications. The couplers are supplied with SMA female connectors and a 1 W, 50 W termination. Price: $120. Delivery: stock.
Richardson Electronics Ltd.,
(800) 348-5580 or (630) 208-2200.
Ceramic GPS Notch Filter
This ceramic GPS notch filter is designed to notch out the GPS signal while providing 50 dB of attenuation at 1575 MHz. The notch filter is built on the company's PCB filter platform using 6 mm coaxial line elements.
Trans-Tech, a subsidiary of Alpha Industries,
The company's new Innovate Technology (IT) has been integrated into many new-generation frequency mixers, splitters, couplers and transformers. This original patent-pending design incorporates novel construction features, including a profile as low as 0.078" in height with footprints that are the same as existing components, which is particularly significant for compact designs where height-limiting factors are critical. In the IT design, the circuit is mounted inside the cover, held in position with chip bonder and tested only once using the company's robotic test setup. Terminations are attached to the top of the case and connections are welded close to the package leads, resulting in an improvement in high frequency electrical performance due to shorter connection lengths. The absence of the unit's bottom supporting plate provides the space necessary to allow aqueous wash to thoroughly drain during washing cycles. Leads are solder plated for good solderability. Tape-and-reel packaging is available.
Solid-state Programmable Attenuator
The model PA-5127-1 solid-state programmable attenuator operates from 750 to 2000 MHz. The unit's attenuation range is 0 to 127 dB in 1 dB steps and switching speed is 2 ms. The 5 V operating voltage is TTL controlled. This unit is suitable for use in PCS and wireless telephony markets, such as in simulation labs to test handoffs between cell sites. Custom designs are available upon request.
(800) 344-2412 or (317) 895-3600.
The Triax series traixial connectors are suitable for applications where maximum RF shielding and minimum noise radiation of crosstalk are required. Available versions include Triax-C, BNC, TNC, TRB and TRT types in 7/8-20, 11/16-24 and N-Triax thread sizes. The units conform to MIL-C-49142 specifications and include plugs, jacks, receptacles, caps and adapters. Available cable attachment methods include crimp, standard and conical taper clamps. Delivery: 12 to 14 weeks.
High Linearity Attenuator
This surface-mount PCS/PCN high linearity voltage-variable attenuator covers the 18 dB attenuation range with a control of 0 to +5 V and is useful for feedforward applications. Output IP3 is +46 dBm (typ) over a minimum of 18 dB attenuation range and SWR is 1.4 (max). Loss is 2 dB (typ).
TRAK Microwave Corp.,
Multiturn Trimmer Capacitors
These precision multiturn trimmer capacitors operate in cryogenic temperatures down to 4 K. Developed originally for NMR researchers, the product line has been expanded for the new communications circuits that operate at low temperatures. The parts can be ordered as special low temperature capacitors by adding K to the part number. Dielectrics are glass, quartz, sapphire, air and PTFE. The units are processed with special lubricants and have been proven in the field. Nonmagnetic and extended-shaft versions are available with maximum capacitance ranges from 1 to 180 pF in a wide variety of sizes.