Mega Industries’ waveguide tuners are precision probes mounted in the broad waveguide wall to allow for variable mismatch compensation. Our tuners range in size from WR-28 to WR-2300. Our complete line of E-H Tuners offer a form of in line waveguide structures to be used for impedance matching. These units, which will match out up to a 4:1 VSWR at any phase angle throughout the band of operation, utilize Mega Industries non contacting, single or double bucket short circuit designs for high power operation. Low power versions are also available utilizing contacting short circuit designs.
These devices are available for either manual or motorized operation. Remote Readouts and operating panels may be provided upon request.
Contact Mega Sales if you do not see the Waveguide Tuners configuration your high-power microwave application requires.
Made in 3-Probe and 5-Probe models, these devices will match out up to a 1.5:1 VSWR at any phase angle when placed in a waveguide circuit. The devices utilize Mega Industries’ contacting plunger designs for reliable high power operation. Three probe units will readily match out a 1.25:1 mismatch while the 5 probe version will compensate for up to a 1.5:1 mismatch over a limited bandwidth. The insertion of the probe can limit the highest power levels these devices can be used at to 60% to 75% of full waveguide peak power levels.
The basic operational characteristic of the device is the insertion of a set of capacitive probes spaced at either 1/8λ or 3/8λ apart. The device is placed in the system as close to the load mismatch as possible. In theory the desired matching effect could be accomplished by a single probe spaced at an odd number of quarter wavelengths from the load mismatch. In practical terms however, placing a probe at the exact position is tedious and not possible for variable loads. This is where Probe Tuners prove valuable, making use of a combination of 3 or 5 probes allowing a load mismatch to be tuned out. These devices are available for either manual, precision manual, or motorized operation. Remote readouts and operating panels may be provided upon request.
Stub Tuners utilize a set of 1 to 3 waveguide stubs to be used for impedance matching. The most common of these units utilize Mega Industries non contacting double bucket short circuit designs for high power operation. Low power versions are also available utilizing contacting short circuit designs. Single stub units will match out a 2:1 mismatch over a 5% band while the double stub unit will match a 4:1 mismatch over a 20% frequency bandwidth and the 3 stub version will match out up to a 20:1 VSWR when appropriately placed in a waveguide circuit. The shorting buckets used in these designs can be water cooled to increase continuous or average power handling capacity and are able to withstand full peak power across the band.