Lowpass Filters Reject 20 GHz

Aug. 1, 2012

Two new patent-protected lowpass filter models from Mini-Circuits (LFCN-113+ and LFCN-123+) offer wide passbands of DC to 11 GHz and DC to 12 GHz, respectively, with low insertion loss and robust power-handling capability. The two compact filters are based on low-temperature-cofired-ceramic (LTCC) technology and are ideal for rejecting unwanted harmonic signals in communications systems. Model LFCN-113+ can handle input power levels to 8 W and features less than 2-dB insertion loss from 9.7 to 15.0 GHz. The typical VSWR is 1.60:1 from DC to 11 GHz. The filter delivers at least 20-dB rejection starting at 14 GHz through about 20 GHz. Model LFCN-123+ extends the passband from DC to 12 GHz with similar in-band power-handling capability and low in-band insertion loss. The miniature filters, which are rated for breakdown voltage of 1 kV, are supplied in a hermetic housing measuring just 3.2 x 1.6 mm. They are suitable for use at operating temperatures from -55 to +100°C. In addition, they include small wrap-around terminations to minimize variations due to parasitic electric elements.

About the Author

Jack Browne

Technical Contributor

Jack Browne, Technical Contributor, has worked in technical publishing for over 30 years. He managed the content and production of three technical journals while at the American Institute of Physics, including Medical Physics and the Journal of Vacuum Science & Technology. He has been a Publisher and Editor for Penton Media, started the firm’s Wireless Symposium & Exhibition trade show in 1993, and currently serves as Technical Contributor for that company's Microwaves & RF magazine. Browne, who holds a BS in Mathematics from City College of New York and BA degrees in English and Philosophy from Fordham University, is a member of the IEEE.