The Q-factor

18 May 2010

Murata has added a series of 500V-rated low loss monolithic ceramic capacitors for high frequency applications to the line-up of its GQM series

First 500V-rated MLCCs with low-loss base metal electrodes improve Q-factor of high-frequency circuits.

Murata has added a series of 500V-rated low loss monolithic ceramic capacitors for high frequency applications to the line-up of its GQM series, by integrating its low loss materials technology and its base metal electrode technology. The GQM22 series is the world's first 500V-rated MLCC with base metal electrodes, featuring high Q-factor, tight capacitance tolerance and excellent high frequency characteristics.

Although the use of base metal electrodes has been known to be effective in reducing loss and improving Q-factor, their use had until now been accompanied by problems involving characteristic adjustments and firing conditions, amongst other issues. With the addition of the GQM22 series, Murata has used its materials technology and co-fired ceramic technology to make the use of base metal electrodes possible.

The GQM22 series is ideal for matching or coupling circuits used in applications such as power amplifiers for mobile communication, WiMAX and LTE base stations, as well as other related high frequency RF modules. Together with Murata's existing 100V and 250V-rated products, the introduction of the GQM22 series makes high Q and low ESR possible at VHF, UHF and GHz frequencies. The new devices feature a 40% improvement in Q at 1MHz over Murata's general-purpose medium and high voltage capacitors.

With dimensions of 2.8mm x 2.8mm x 1.15mm and capacitance ranging from 0.5pF to 100pF, the GQM series may be used for tight tolerance products (around capacitance tolerance±0.1pF). DC withstand voltage is 1250V. Operating temperature range of the GQM22 series is -55°C to +125°C.


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