M.E.C.’s state-of-the-art convection cooled super high-power terminations exemplify M.E.C.’s innovative approach to satisfying specific customer requirements.
Super High-Power Terminations
Liquid Cooled Terminations
M.E.C.’s liquid cooled 80-W Series terminations operate with a VSWR of 1.05:1 max. Thirteen models cover the full waveguide frequency band from 2.60 to 40.0 GHz. As dummy loads, these units ideally meet the demands of today’s extremely high-powered systems to permit operational check-out without radiating RF power. Unit construction utilizes high temperature absorbing material intimately connected to the waveguide walls for efficient heat transfer. All units are designed to operate in any position with a coolant inlet pressure of 100 PSIG (max.) and temperature of 150º F (max.). Units are aluminum with MS33656E4 ¼” flared tube fittings for the liquid coolant connections.
Optional sampling probes from 30 to 50 dB, with typical sampling flatness of ± 0.5 dB across the entire band, may be supplied as separate units to monitor power. Finish is chemical film per MIL-C-5541, Class 3, followed by high-temperature black epoxy enamel.
High Power & Extra High-Power Terminations
M.E.C.’s High Power 80-H Series and Extra-High Power 80-E Series terminations are constructed out of finned aluminum waveguide, which contain high temperature absorbing material intimately connected to the waveguide walls for efficient heat transfer. Standard units of 1,000 W or less are cooled by free air convection while units of more than 1,000 W utilize forced air cooling. For higher powers, shorter lengths, or lower temperature rises, an integrally mounted fan and ducted housing may be supplied to provide forced air cooling. The full waveguide frequency band VSWR is 1.05:1 max. for the 80-H series and 1.06:1 max. for the 80-E series.
Designed to withstand conditions of extreme temperature and thermal shock, these terminations are ideal for use in high power systems as dummy antennas to permit testing, tuning, and maintenance without radiating RF power.
Optional sampling probes from 30 to 50 dB, with typical sampling flatness of ± 0.5 dB across the entire band, may be supplied as separate units to monitor power and are available for both 80-H and 80-E Series units. Finish is chemical film per MIL-C-5541, Class 3, followed by high temperature black epoxy enamel.
Medium Power & Sliding Terminations
M.E.C.’s 80-LS sliding terminations consist of a well-matched, tapered sliding load in a precision aluminum waveguide housing. The sliding load can be moved more than one-half wavelength at the lowest frequency. Optional micrometer drive is available for bands H through A. Applications include simulating a perfect termination for precise measurement of VSWR, impedance, directivity or isolation. By reversing the phase of the sliding termination it is possible to subtract it from other small reflections in the system under test.
M.E.C.’s 80-M medium power terminations are similar to their low power counterparts, but are designed to handle higher power levels and are convection-cooled. These units have low VSWR and are lightweight. These units are typically used in system/test bench set-ups and as moderate power dummy loads.
Optional sampling probes from 30 to 50 dB, with typical flatness of ± 0.5 dB, may be supplied as separate units and are available for both 80-LS and 80-M Series units. Finish is chemical film per MIL-C-5541, Class 3, followed by gray epoxy enamel for sliding loads and black enamel for medium power terminations.
Low Power Matched Terminations
M.E.C.’s Standard Length 80-L Series, Ultra-Short 80-LU Series, and Communications and Narrow Band 80-LA Series terminations consist of precision aluminum waveguide containing rugged material specially selected and designed to absorb incident power with very low reflection.
These units are ideal for laboratory and field measurements and production setups requiring high quality terminations. Additional features are short length and light weight. Typical applications include VSWR measurement of waveguide components, low power dummy antennas, and matched terminations for directional couplers, hybrids and other devices.
All units have a chemical film finish per MIL-C-5541, Class 3, followed by gray epoxy enamel. A power sampling probe can be supplied as a separate unit with any of the terminations. Typical flatness is ± 0.5 dB across the entire band for sampling levels from 30 to 50 dB.