- Buyers Guide
High Power Limiter
The model ACLM-4932HC24 high power limiter operates over the frequency range from 0.002 to 1.5 GHz. The limiter offers 100 W of CW power protection and 100 W (peak) at a pulse width of 1 ms. Other pulse power-handling capabilities include 600 W (peak) at a 5 ms pulse width and 200 W (peak) at a 70 ms pulse. Insertion loss is limited to 0.3 dB with an SWR of 1.2 (max) and CW leakage is +14 dBm. This limiter is ideally suited for receiver protection, high power radars and communication systems. It is housed in a coaxial package with SMA connectors on the input and output.
Advanced Control Components Inc.,
Eatontown, NJ (732) 542-7500.
Cellular Transmit/Receive Filter Set
This cellular transmit and receive filter set is available for Advanced Mobile Phone Service (AMPS), Global System for Mobile communications (GSM) and specialized mobile radio systems. The filters cover the full band and achieve greater than 60 dB isolation, yet have an insertion loss of less than 2.5 dB across a temperature range of –40° to +85°C. The center frequency is 835 and 880 MHz for the transmit and receive filters, respectively. Pass band loss is £ 2.5 and pass band SWR is < 1.5. The units' specifications make them suitable for use in a broad range of harsh environmental conditions.
ComNav Engineering Inc.,
Portland, ME (207) 797-4588.
Micro-Pack Mixer Package
The model B60KZ micro-pack mixer package offers a small-size double-balanced mixer with removable connectors that can be tested before system integration. The unit provides up- and downconversion with RF/LO frequencies of 6 to 18 GHz and IF frequencies of DC to 4 GHz. The package size is 0.56" x 0.52" x 0.19". Units with different LO drive levels are available. Micro-pack triple-balanced mixers are also available for IF frequencies of 1 to 8 GHz. Mixers for high reliability applications can be screened per MIL-STD-883 or MIL-STD-202.
Santa Clara, CA (408) 748-7751.
The model WSD-00088 compact, low loss, fullband AMPS duplexer is offered in a cost-efficient 8.07" x 3.00" x 2.50" housing (excluding connectors). The device offers 0.5 dB (max) and 18 dB (min) insertion and return loss, respectively, over both the receive pass band of 824 to 849 MHz and the transmit pass band of 869 to 894 MHz. Antenna-to-receive rejection is 40 dB (min) from both DC to 750 MHz and 869 to 2682 MHz. Transmit-to-antenna rejection is also 40 dB (min) from both DC to 849 MHz and 960 to 2682 MHz. Operating temperature range is –25° to +70°C. Delivery: eight to 10 weeks (ARO).
K&L Microwave Inc.,
Salisbury, MD (410) 749-2424.
Microminiature SPDT Coaxial Switch
The model MMS-28-F-PC SPDT microminiature (0.75" x 0.75" x 0.25") switch can be used for hot switching amplifiers at 50 W up to 1 GHz. The switch's small size allows it to be soldered onto a PCB. Applications range from cellular to personal communications network (PCN)/PCS to military avionics. Features include failsafe and availability in 12 or 28 V DC. The unit operates over the frequency range from DC to 12.4 GHz with an SWR of 1.5 (max) and an insertion loss of 0.5 dB (max). Isolation is 50 dB (min), power handling is 50 W CW at 3 GHz and switching time is 12 ms. Delivery: stock to six weeks.
Dow-Key Microwave Corp., a Dover Technologies company,
Ventura, CA (805) 650-0260.
High Q Receive Filter
This high Q receive filter is designed for use in 500 MHz radios and features a 3 dB bandwidth of 5 MHz and a rejection of 90 dB (min) at 10 MHz from the center frequency. Insertion loss is less than 2 dB. Size: 8.4" x 3.7" x 1.5". A transmit version has a rejection of 60 dB (min) with less than 1 dB insertion loss. Size: 6.5" x 3.7" x 1.5". A diplexer version is also available.
Filtel Microwave Inc., Vaudreuil-Dorion,
Quebec, Canada (514) 455-6082.
6 - 18 GHz, 8-bit, 360° Phase Shifter/Frequency Translator
The model 7928 hermetically sealed, 0 to 360° PIN diode phase shifter covers the frequency range from 6 to 18 GHz. As a phase shifter, the unit's accuracy is better than 12°. As a frequency translator, carrier suppression exceeds 25 dB and sideband suppression exceeds 20 dB. Switching speed is < 500 ns. The unit is an integrated assembly of an RF vector modulator and a driver circuit. Improved phase accuracy and PM/AM performance are achieved by using double-balanced biphase linear amplitude modulators.
General Microwave Corp.,
Amityville, NY (516) 226-8900.
2800 - 5300 MHz Microwave Mixers
The model SKY-53R microwave mixers feature wideband 2800 to 5300 MHz frequency coverage and IF response from DC to 500 MHz (usable to 2200 MHz). Typical isolation is 28 dB (L-R) and 12 dB (L-I) with 11 dBm (typ) IP3. Conversion loss is only 5.7 dB (typ) midband. A key advantage is the small package with a low profile height of only 0.10", which allows for greater board density and surface-mount design efficiency while solder-plated J leads reduce thermal stress and leaching significantly. A five-year Ultra-Rel" guarantee is included in the unit price of $14.95 (1–9). Tape-and-reel packaging is available.
Brooklyn, NY (718) 934-4500.
Hermetic, Surface-mount Resistor Networks
These hermetic, surface-mount resistor networks are designed specifically for applications where tolerance, ratioing and long-term stability are critical. The rugged, glass-to-metal package construction is suitable for use in military, space and hostile environment electronics. The package style is an SMT, hermetic flatpack, gullwing lead, and the configuration contains 14 or 16 leads. The resistance range is 10 W to 1 MW standard, available absolute tolerance is 10 to 0.05 percent, current noise is < 30 dB (typ) and operating voltage is 100 V (max) standard. Power rating is 50 mW per resistor at 70°C derated linearly to 150°C.
Mini-Systems Inc. (MSI), Thin Film Division,
Attleboro, MA (508) 226-2111.
The model RF2608 upconverter contains both a double-balanced mixer stage and an output buffer amplifier stage. The mixer is a Gilbert cell with emitter degeneration resistors to provide high IP3. The output stage, a class B push-pull configuration, reduces the overall current while providing a good 50 W output match. The device also can be used for direct biphase-shift keying modulation of a carrier. The device operates at a supply voltage from 2.7 to 5 V and does not require any external matching components other than coupling capacitors. Manufactured using silicon bipolar junction technology process technology, the upconverter is priced at 98¢ in volume.
RF Micro Devices Inc.,
Greensboro, NC (910) 664-1233, ext. 3327.
Transfer Electromechanical Switches
These transfer electromechanical switches operate over the frequency range from DC to 26.5 GHz and offer a typical insertion loss of 0.4 dB, SWR of 1.4 (max) and isolation of 70 dB (min). This switch series is offered in failsafe or normally open operating modes and a break-before-make switching sequence. Available options include a TTL logic drive, suppression diodes, indicators and electronic cutoff circuitry. SMA connectors are standard, but alternate connector or pin requirements can be satisfied on request.
Sage Laboratories Inc.,
Natick, MA (508) 653-0844.
0° and 90° mm-wave Hybrids
These compact hybrids have a frequency range of 35 to 40 GHz. Both 0° and 90° hybrids have a low insertion loss of 1.5 dB (min) with phase balance at 5° (max) and amplitude balance at 0.5 dB (min).
Hauppauge, NY (516) 436-7400, ext. 339.
Unbalanced Impedance Transformer
The model SPTL 109 unbalanced impedance transformer has an input impedance of 50 W unbalanced and an output impedance of 75 W unbalanced. The operating frequency range is 10 to 1000 MHz, insertion loss is 0.8 dB (max), SWR is 1.4 (max) and input power is 1.5 W (max). Price: $39. Delivery: stock to six weeks.
Technical Research and Manufacturing Inc. (TRM),
Bedford, NH (603) 627-6000.
Microstrip Isolators and Circulators
These microstrip isolators and circulators are designed for TR module applications. Typical specifications are 20 dB isolation, 0.5 dB insertion loss and 1.25 SWR with bandwidths up to 20 percent. These small, lightweight isolators and circulators are available in various pattern configurations from C- to Ku-band. Units are manufactured using low outgassing epoxies capable of withstanding automated pick-and-place environments.
TRAK Microwave Corp.,
Tampa, FL (813) 884-1411.
5 W Fixed Termination
The model HTF-55 fixed termination operates from DC to 12.4 GHz and is rated at 5 W (avg). The peak power-handling capability is rated at 250 W (max). Connector options include SMA and N.
Indianapolis, IN (800) 344-2412 or (317) 895-3600.