Paris, France. Exxelia, a designer and manufacturer of complex passive components and high-precision subsystems for harsh environments, has announced it will exhibit at the International Microwave Symposium June 4-6 in Honolulu. The company will preview several new microwave and RF components dedicated to a variety of industries including medical, transportation, and defense.
For example, the new NHB Series includes a complete range of multilayer ceramic capacitors based on NPO dielectric material providing a high self-resonant frequency and limiting the parasitic parallel resonant frequencies. The series is available in 1111 size with capacitance ranging from 0. 3 pF to 100 pF. NHB Series capacitors serve RF power applications at temperature up to 175°C at 500 VDC. Lowest ESR is obtained by combining highly conductive metal electrodes and proprietary new NPO low-loss rugged dielectrics. NHB Series devices can serve in cellular base-station equipment, broadband wireless service point-to-point/multipoint radios, and broadcasting equipment. Typical circuit applications include impedance matching, bypass, feedback, tuning, coupling, and DC blocking.
The company will also highlight invar tuning screws with self-locking system. Invar-36 is a unique Iron-Nickel alloy (64 % Fe / 36 % Ni) sought after for its very low coefficient of thermal expansion. With 1.1 ppm. K–1 between 0°C and 100°C, Invar-36 is about 17 times more stable than brass, which is the most traditional and common alloy that tuning elements are made of, the company reports, adding that the working temperature range in space is so wide that this property becomes essential for a reliable and stable cavity filter tuning. Self-locking system is a technology commonly used on tuning elements made of brass or other soft “easy-to- machine” alloys, but is innovative and advanced when applied to hard and tough Invar 36. The design consists of two threaded segments separated by two parallel slots. After cutting both parallel slots, the rotor is compressed in its length in order to create a plastic deformation. Thus, an offset is induced between the two threaded segments, which generates a constant tensile stress in the rotor from the moment threaded segments are screwed.
Finally, the company will exhibit high Q factor dielectric resonators designed to replace resonant cavities in microwave functions such as filters and oscillators. Exxelia has developed with support of ESA and CNES a new high-end dielectric material, E7000, designed for high-end filters where high Q factor is requested. E7000 provides high-performance suitable for space use in the frequency range 5 to 32 GHz Typical applications include satellite multiplexing filter devices, radio links for communication systems (LMDS), and military radars.
