Merrimac Granted a Second Patent for Multi-MixTM Waveguide Filter
WEST CALDWELL, NJ (December 4, 2000) - Merrimac Industries, Inc. (AMEX: MRM), a leader in the design and manufacture of RF Microwave components, assemblies and Micro-Multifunction (MMFM
TM) Modules today announced that it has been granted another patent for its Multi-MixTM Waveguide Filter from the United States Patent and Trademark Office entitled "Multilayer Dielectric Evanescent Mode Waveguide Filter."
Merrimac Chairman and CEO, Mason N. Carter commented, "This patent complements the Waveguide Filter patent which we recently announced on November 14, 2000, while providing us with a competitive advantage in future narrow band filter designs. Such filters are typically found in wireless applications such as basestations, mobile radios, pagers, point to point and point to multipoint radios, local multipoint distribution service, (LMDS), global positioning system (GPS) and microwave TV/wireless cable (signal channeling for line of sight communications systems from supplier transmitter to subscriber rooftop and set top box)."
Carter continued, "This patent enables us to lower our costs for mass production and to achieve better performance in the design of narrow band filters. This patent, coupled with the earlier announced Waveguide Filter patent, helps us position ourselves to better serve key market opportunities and to provide more value to our customers by reducing size, weight and cost."
Very narrow bandwidths with minimal insertion loss and high selectivity at microwave frequencies are achievable utilizing a multilayer dielectric, evanescent mode waveguide, bandpass filter with resonators employing via hole technology. A typical implementation of this filter is fabricated with soft substrate multilayer dielectrics and with high dielectric constant ceramics. These filters can be designed with frequency ranges from approximately 0.5 GHz to approximately 60 GHz. This filter typically takes up less space than other filters presently available and requires no tuning.
