Hittite has introduced an SMT packaged, MMIC tuneable band reject filter which is designed to eliminate unwanted signals in test and measurement equipment, signal processing equipment and electronic warfare (EW) subsystems up to 25 GHz.
The HMC1000LP5E exhibits only 3 dB of insertion loss within its pass band of 100 MHz to 25 GHz. The band rejection frequency is user selectable, and can be varied between 3,6 and 12,2 GHz, while the -20 dB filter bandwidth can be varied from 6% to 14%.
The device offers four different stop band tuning modes, and is controlled by two analog tuning voltages between 0 and +14 V. Furthermore, by virtue of its monolithic implementation, it exhibits excellent immunity to vibration and microphonics. The HMC1000LP5E delivers fast tuning speed of 200 ns and provides a dynamically adjustable solution in advanced communications applications. The non-reflective filter exhibits good return in the pass band as well as the stop band, and delivers residual phase noise of -162 dBc/Hz.
The HMC1000LP5E is a solid state solution which offers a smaller alternative to physically large, mechanically tuned filter implementations. It is housed in a RoHS compliant, 5 x 5 mm QFN SMT plastic package.
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In practice, engineers building compact RTK products keep discovering the same thing: the hardest component in the system is no longer the receiver. It is the antenna.
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