- Buyers Guide
Broadband, Low Video Transient Switches
The models SWN-AKG-1DR-12-HS-LVT and SWN-AKG-1DR-12X-LVT SPST PIN diode switches cover the frequency band of 0.5 to 18 GHz and are available in either reflective or absorptive versions. Isolation is typically 100 dB at 0.5 GHz and 80 dB at 18 GHz. Switching speed is typically £ 50 ns with rise/fall of £ 10 ns and low video transients. Power handling is +20 dBm operating and 1 W survival. Size: 1.0" x 1.0" x 0.5". Control is TTL compatible. Multithrow versions also are available.
American Microwave Corp.,
Frederick, MD (301) 662-4700.
DC - 6 GHz Connectors
The 50 W MicroMate series connectors operate from DC to 6 GHz and feature the MMCX interface, which complies with the CECC22000 European specification. Various patterns, cable entries and adaptors can be selected. Ready-made cables can be purchased from the company or users can assemble the cable themselves. The new production technology features improved stamping and mold design to create a slightly lower connector profile, which allows for better PCB stackability and provides a guided entry for the connectors. The interface guarantees good mechanical and electrical performance up to 6 GHz.
Danbury, CT (203) 743-9272.
This drop-in isolator designed for cellular radio applications delivers good intermodulation (IM) performance of better than –90 dBc in forward IM products and –108 dBc in reverse IM products. Other typical parameters include isolation of 25 dB (max), insertion loss of 0.28 dB (min) and return loss of 23 dB.
Densitron Microwave Ltd.,
Southend-on-Sea, Essex, UK 44 (0) 1702 463440.
SATCOM Coaxial Relay Switch
This relay switch is designed specifically for satellite communications (SATCOM) applications in the avionics market. The switch meets the environmental requirements of RTCA document DO-160C and ARINC 741 characteristics. The SPDT electromechanical switch offers failsafe indicator circuitry and is available in 115 V AC or 15 V DC versions. The unit operates from DC to 2 GHz with an insertion loss of 0.2 dB (max), isolation of 70 dB (min) and SWR of 1.2 (max). Delivery: stock to six weeks.
Dow-Key Microwave Corp.,
Ventura, CA (909) 272-1685.
Dense Wavelength Division Multiplexer Filter
This dense wavelength division multiplexer (WDM) filter is designed specifically for dense WDM systems and achieves 200 GHz narrow line width filtering at International Telecommunication Union wavelengths with low insertion loss and high channel isolation. The filter uses thin-film interference coatings, which provides good environmental stability. Size: 5.5 (diam) x 32.0 mm. The filters can be cascaded in any sequence for a 16- or 32-channel multiplexer or demultiplexer array.
E-Tek Dynamics Inc.,
San Jose, CA (408) 432-6300.
Broadband SP5T PIN Diode Switch
The model 1802 SP5T PIN diode switch operates over the 300 MHz to 26 GHz frequency range. This solid-state, TTL-driven switch is designed to multiplex several signal sources into a common output. The unit's five input ports are broken into several frequency bands, including 0.3 to 4 GHz, 4 to 8 GHz, 8 to 14 GHz, 14 to 18 GHz and 18 to 26 GHz. The common output port has an instantaneous bandwidth of 300 MHz to 26 GHz. Custom frequency bands are available. The 50 W switch is equipped with SMA connectors and features an SWR over the entire band of less than 2.2 (max). Insertion loss ranges from 2.5 dB at the lowest frequencies to 4.5 dB at maximum frequencies. The unit switches in less than 50 ns and exhibits an on/off ratio of better than 40 dB. Size: 1.5" (octagonal) x 0.9". Weight: 3 oz.
General Microwave Corp.,
Amityville, NY (516) 226-8900, ext. 291.
The MICROtune™ series 0805-size capacitors are used in automated functional RF tuning and are available in two tuning ranges: 10.0 to 1.2 pF and 6 to 1 pF. These surface-mount technology components exhibit minimum Q ratings of 75 and 300 at 200 MHz. Price: 35¢ (100,000). Delivery: stock to six weeks.
Johanson Technology Inc.,
Camarillo, CA (805) 389-1166.
The model QH-1338 3 dB 90° hybrid junction operates in the 943 to 960 MHz cellular frequency range. The unit features an isolation of 15 dB (min), SWR of 1.25 (max) and total loss of less than 3.45 dB including loss due to coupling and frequency sensitivity. Size: 3.362" x 0.507" x 0.375". Price: $125 (1–9). Delivery: 30 days (max).
KDI/triangle Electronics Inc.,
Whippany, NJ (201) 887-5700.
Surface-mount Lowpass Filter
The model SL-19 lowpass filter features a 1 dB cutoff of 19 MHz and rejects 20 dB (min) at 21 MHz. SWR is better than 2.0. Size: 1.10" x 0.60" x 0.27".
Kel-Com, a division of K&L Microwave Inc.,
Salisbury, MD (410) 749-6774.
37 to 40 GHz Waveguide Isolator and Circulator
The model T-036W01 isolator and model C-036W01 circulator are designed for use in 38 GHz microwave radios. Both models typically offer 25 dB isolation, 0.25 dB insertion loss and 1.15 SWR over the 36 to 40 GHz range. Guaranteed performances include 20 dB isolation, 0.3 dB insertion loss and 1.25 SWR over the temperature range of –30° to +70°C. Size: 0.50" x 1.25" x 0.75" (isolator); 0.75" x 1.00" x 0.75" (circulator). Delivery: stock to 60 days.
MICA Microwave Corp.,
San Jose, CA (408) 363-9200.
SDRAM-based, 168-pin DIMM Module
These 16 M synchronous dynamic random access memory (SDRAM)-based dual in-line memory modules (DIMM) utilize components built on 0.30 mm process technology and are designed to support the 100 MHz PC bus speeds that are becoming the industry standard. Sample volumes of the 3.3 V DIMMs are available in several versions, including 2 M x 64 (model MT8LSDT264AG), 2 M x 72 ECC (model MT9LSDT272AG), 4 M x 64 (model MT16LSDT464AG) and 4 M x 72 ECC (model MT18LSDT472AG). Higher density SDRAM DIMMs for PCs are available.
Micron Technology, Inc.,
Boise, ID (208) 368-4400.
PCS Transmit Bandpass Filter
The model C5031 personal communications service (PCS) transmit bandpass filter passes the 1930 to 1990 MHz PCS transmit frequencies while providing greater than 50 to 60 dB rejection to the 1850 to 1910 MHz receive frequencies. The filter provides good frequency flatness with a low insertion loss and SWR of 0.9 dB and 1.45, respectively. The unit has good electrical performance, environmental stability and mechanical reliability.
Norwalk, CT (203) 866-8000.
Medium-power Dry Loads
The models 630, 640 and 650 high performance loads offer power ratings of 30, 40 and 50 W, respectively. All three models offer a frequency range of DC to 3 GHz with a maximum SWR of 1.2. Available connector types include BNC, N, SMA, TNC and 7-16.
Microwave Devices Inc.
Franklin, IN (317) 736-8833.
2800 - 5300 MHz Microwave Mixers
The SKY-53R series microwave mixers feature wideband 2800 to 5300 MHz coverage and an 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) third-order intercept point (IP3). Conversion loss is 5.7 dB (typ) midband. The low profile height of 0.10" allows for greater board density and surface-mount design efficiency. The solder-plated J leads reduce thermal stress and leaching. Price: $14.95 each (1–9).
Brooklyn, NY (718) 934-4500.
PCS Directional Couplers
This directional coupler from the company's TELEPAC™ series operates over the 1700 to 2100 MHz frequency band and offers insertion loss of 0.2 dB (max), SWR of 1.29 (max) and directivity of 18 dB (min). Average power handling is 250 W CW. Coupling values are available in 6, 10, 20 and 30 dB. The coupler can be used in SWR sampling and power monitoring in telecommunications basestations. Size: 2.40" x 1.01" x 1.16".
Sage Laboratories Inc.,
Natick, MA (508) 653-0844.
Four-line Data Line Chokes
These four-line data line chokes provide a space-saving alternative to wired components in automotive engineering, industrial electronics, telephone systems, building services and automation. The units are designed for the S0 basic access and the S2M multiplex interfaces of integrated services digital network telephone systems. Models are available with asymmetrical attenuation up to 48 dB and rated inductances of 2 x 11 mH to 4.7 mH. The units operate over the –55° to +125°C temperature range.
Siemens Matsushita Components,
Munich, Germany (++49 911) 978-3321.
Six-way Power Divider
The model DL 6837C six-way power divider operates in the 824 to 849 MHz frequency range. Insertion loss is 1 dB, isolation is 23 dB, SWR is 1.3 (max) and amplitude balance is +/-0.25 dB (max). Connectors are SMA. Price: $149. Delivery: stock to six weeks.
Technical Research and Manufacturing Inc. (TRM),
Bedford, NH (603) 627-6000.
The 7600 series filtered terminal blocks eliminate electromagnetic interference (EMI) at a logical point in the circuit without increasing component count or adding solder connections. The blocks operate at 100 W V DC from –55° to 105°C and provide a capacitance range from 2500 to 5000 pF. The units offer an insertion loss of 50 dB at 100 MHz.
Tucson, AZ (520) 744-0400.
Gold-flashed SMT Terminations
These gold-flashed terminations provided on size 1008 and 0805 coil components offer good electrical characteristics and are designed for multichip modules (MCM). Gold terminations reduce oxidation when utilized in hermetically sealed packages such as pacemakers or military applications. The ceramic core construction of these components offers high Q and SRF values. Delivery: stock to six weeks.
San Diego, CA (619) 674-6686.
PCB Surface-mountable Solid-state Relay
The model LR1200480D40 DC-controlled AC solid-state relay is capable of controlling up to 40 A at a line voltage of 480 V AC. The unit features zero voltage turn-on through back-to-back SCR output switches capable of 1200 Vpk transients, a logic-compatible control and 4000 V RMS isolation between the input and output. The relay is available in different voltage and current ratings ranging from 240 to 480 V AC and from 25 to 40 A. The unit can be purchased in three control types: AC input, DC input and random turn-on DC control. The unit is housed in a high grade stable plastic package ensuring protection of the internal circuitry. Size: 1.4" x 1.12". Price: $14.60 (500). Delivery: stock to eight weeks.
Scottsdale, AZ (602) 443-1288.
Miniature/Subminiature Profile Resonators and Inductors
These ceramic coaxial line resonators and inductors designed for low frequency applications are available in four different dielectric constants to operate from 300 MHz to 3 GHz. For low frequency applications (300 MHz), lengths of up to one inch in 2 and 3 mm square outside dimensions are offered. The units can be specified as resonators or inductors depending on requirements. Dielectric constants available include 10, 20, 38 and 90.
Trans-Tech, a subsidiary of Alpha Industries,
Adamstown, MD (301) 695-9400.
The QDS series RF connectors with type C and SC interfaces feature a quick connect/dis-connect design employing a spring-loaded sleeve on the male member that draws back to let three self-contained balls seat into a mating groove on the female and then slide forward. This positive locking mechanism eliminates cross threading and is easy to install. Configurations include plugs, jacks, receptacles and between-series adapters.
Peabody, MA (508) 532-0775.
LMDS MMIC Package
This high frequency MMIC package designed for use in local multipoint distribution system (LMDS) applications features an insertion loss of less than 0.5 dB and a return loss of better than 15 dB in the 25 to 30 GHz frequency range. The 0.285" x 0.285" package has two RF ports and eight DC ports. The package features a cavity size of 125 x 70 mils and can incorporate the majority of low noise MMIC amplifiers on the market.
PmT – princeton microwave,
Mercerville, NJ (609) 586-8140.
The DUREL® series model D358 electroluminescent (EL) driver developed by Durel Corp. is tailored specifically to power larger EL displays used in cellular telephones, personal digital assistants, databanks and global positioning handsets. Matching the IC inverter with standard DUREL EL lamp construction provides a system that uses very low battery power to backlight a relatively large liquid crystal display and membrane keypad area. The inverter requires only one inductor and one capacitor. The inverters consist of a family of switch-mode, surface-mountable IC DC-AC drivers. The patented drivers have microprocessor interfaces that enable both power-down and dimming features.
Rogers, CT (860) 774-9605.
Cable Modem ASIC Chip
The model STEL-2176 application-specific IC (ASIC) chip incorporates all of the modulator/demodulator functions required for subscriber modems in hybrid fiber coax cable systems. On the downstream path, the unit's demodulator section is programmable to receive 16, 64 or 256 quadrature amplitude modulation (QAM) with high acquisition speed. On the upstream path, the modulator section is programmable to either quadrature phase-shift keying (QPSK) or 16 QAM PSK-modulated signals with optimal spectral shaping and fine-tuning resolution from 5 to 65 MHz. Price: less than $30 (production quantities).
Sunnyvale, CA (408) 745-0818.
7 - 40 GHz Directional Couplers
These high directivity couplers are designed for use in one-plus-one (hot standby) digital microwave radio applications from 7 to 40 GHz. Coupling is offered at 3, 6, 10 and 12 dB. Directivity is 20 to 40 dB. Waveguide sizes include WG15, 17, 18, 20, 21 and 22; WR112, 75, 62, 42, 34 and 28; and R84, 120, 140, 220, 260 and 320. Delivery: less than 4 weeks.
Quasar Microwave Technology Ltd.,
Heathfield, Newton Abbot, Devon, UK (01626) 834222.
Ultraminiature Surface-mount Trimmer Capacitors
The JS series ultraminiature trimmer capacitors measure 2.8 x 2.2 x 1.0 mm and maintain the good stability of the larger JZ and JR series trimmers. Two ranges are available: 3 to 10 pF and 4.5 to 20 pF. Q is more than 2000 at 10 MHz. The units are available as panel surface, printed circuit or strip line mount.
Denville, NJ (973) 586-8585.