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API Technologies Corp. (API), a provider of electronic systems, subsystems, RF and secure systems for defense, aerospace and commercial applications, announced the availability of its new CMD837, 1.0 to 18.0 GHz highpass/lowpass diplexer bias-T from its CMT filters product group. The CMD837, 1.0 to 18.0 GHz bias-T is an ideal solution when RF modulation or DC injection is essential.
“Manufacturing a diplexer with this broad of a highpass frequency range that also maintains a good return loss and insertion loss is a challenge,” said Jerry Roberds, Vice President of Engineering, CMT Filters Commercial, Defense and Space Filter Product Group of API Technologies. “Our design and manufacturing expertise enabled us to produce a repeatable result that meets our long standing commitment to high-quality and high-reliability.”
The operational frequency range of the lowpass section is DC to 500 MHz and the highpass section is 1.0 to 18.0 GHz. The unit has a return loss of -10.0 dB minimum for both the lowpass and highpass sections. The insertion loss is -0.7 dB maximum for the lowpass and -1.25 dB maximum for the highpass. “Equally impressive to the electrical performance is the extremely compact size of the CMD837,” added Roberds. The filter measures only 1.5”L x 0.8”W x 0.5”H.
Each of the channels is comprised of a seven section Chebychev filter. The individual filters are diplexed to provide for a common port that passes DC to 500 MHz and 1.0 to 18.0 GHz. The low frequency port allows for injection of a DC to 500 MHz bias, or control signal onto the 1.0 to 18.0 GHz band. The diplexing function of the filter provides -30 dB of isolation channel to channel.