The comprehensive range of coaxial and waveguide phase shifters manufactured by US firm L3 Narda-ATM is now available to microwave design engineers in the UK through the company’s representative, Basingstoke-based Link Microtek.
Covering microwave frequency bands all the way up to 40GHz, the phase shifters come in both coaxial and waveguide styles and can be specified with digital counting dial, direct reading dial and servo motor control options. A number of models are specifically designed for use in Ka-band systems.
Well suited for adjusting the phases of elements within a phased array antenna system, the devices are primarily aimed at military or commercial radar applications and can also be used for drive feed balancing on high power amplifiers, as well as general test-and-measurement applications.
The coaxial phase shifter line includes units with minimum adjustable phase shifts of 30, 40, 60, 90, 180 and 360°/GHz. Featuring low insertion loss, the devices have maximum VSWRs ranging from 1.3:1 to 2.0:1, while power-handling capability is specified as 100W average and 3kW peak.
They are housed in sturdy aluminium enclosures with a corrosion-resistant epoxy coating and use SMA, Type N or 2.92mm stainless-steel coaxial connectors. On standard models the phase shift is adjusted via a rotating control knob, with the position fixed by means of a lock nut.
The waveguide phase shifters, meanwhile, are available in both low-power and high-power versions offering minimum phase adjustment from 0 to 360 degrees, with low insertion loss and low VSWR.
Covering waveguide sizes from WR28 to WR137, the low-power models feature a maximum RF power rating of 100W (CW), while the high-power models can handle maximum average powers ranging from 160 to 11,500W and peak powers from 18 to 2500kW, depending on waveguide size.