March 23, 2010
Murata Manufacturing Co., Ltd.
President/ Statutory Representative Director: Tsuneo Murata
Murata Manufacturing Co., Ltd. has commercialized the GQM 500V Series low loss monolithic ceramic capacitor for high frequency applications by integrating its low loss materials technology and base metal electrode technology. Although the use of base metal electrodes has been known to be effective in reducing loss, their use has been accompanied by problems involving characteristic adjustments and firing conditions, among other issues. With this product, Murata has used its materials technology and co-fired ceramic technology to make the use of base metal electrodes possible, successfully commercializing the world’s first 500V-rated monolithic ceramic capacitors with base metal electrodes.
The GQM Series features low loss capacitors for RF power amplifiers used in mobile communication base stations and high-speed broadband base stations, and is a capacitor series ideal for VHF, UHF, and GHz frequency regions. Coming after our 100V and 250V-rated products, the commercialization of this product makes high Q※1 and low ESR※2 possible for the above-mentioned frequency bands, featuring a 40% improvement in Q at 1MHz over our general-purpose medium and high voltage capacitors.
With dimensions of 2.8x2.8x1.15mm and capacitance ranging from 0.5pF to 100pF, this product may be used for tight tolerance products around capacitance tolerance B※3（±0.1pF）. Ideal for matching or coupling circuits used in applications such as power amplifiers for mobile communication, WiMAX※4 and LTE※5 base stations, as well as other related high frequency RF modules, this product will help improve the high frequency characteristic of equipment.
Power amplifiers are used in mobile communication base stations and high-speed broadband base stations to amplify signals that are sent and received, and the circuits of these amplifiers are made up of semiconductors and a large number of monolithic ceramic capacitors. In recent years, increasingly high-speed mobile communication has resulted in a shift towards increasingly high frequencies, which has brought about a need for monolithic ceramic capacitors capable of maintaining high Q and keeping the ESR value, which reflects loss, as low as possible even at high frequencies.
In the past, Murata pursued the commercialization of low loss precious metal electrode capacitors for high frequency applications, but the move to even higher frequency bands prompted us to start work on the development of the GQM series, focusing on base metal electrodes, which exhibit excellent high frequency characteristics, and low loss materials which have good temperature characteristics. The use of base metal electrodes has been known to be effective for reducing loss and improving the Q factor, but their use has been accompanied by problems involving characteristic adjustments and firing conditions, among other issues. However, by applying our materials technology and co-fired ceramic technology, Murata has succeeded in commercializing a product with base metal electrodes.
In addition to the 100V and 250V-rated capacitors already available in the GQM Series, Murata has added 500V-rated capacitors to the GQM Series lineup to respond to the high frequency and high voltage needs of today. This allows for greater flexibility in equipment design, and enables compatibility with next-generation communication systems.
In addition, the capacitance tolerance of our general-purpose medium and high voltage products was previously mainly in the J (within ±5%) or D (±0.5pF) range, but with a demand for tight tolerance products to ensure consistency at the design stage and smoother circuit design, this product offers tight tolerance around the capacitance tolerance B（±0.1pF）and C (±0.25pF) range.
| ※1 Q: | Q is defined as the inverse of the amount of electrical energy dissipated as heat within the dielectric when a frequency is applied to the dielectric material used in the monolithic ceramic capacitor. The higher the Q, the lower the loss. |
|---|---|
| ※2 ESR: | ESR (Equivalent Series Resistance) is the series resistive component of a monolithic ceramic capacitor’s equivalent circuit. The ESR value reflects loss. |
| ※3 Capacitance tolerance B: | The capacitance tolerance of capacitors is categorized into a number of classes expressed with letter codes, such as (capacitance tolerance) B (±0.1pF), C (±0.25pF), and so on. |
| ※4 LTE: | LTE (Long Term Evolution) is a new communications standard developed by the 3GPP standards body. If realized, this standard will enable high-speed data transmission with a downlink peak rate of at least 100Mbps and an uplink peak rate of at least 50Mbps. |
| ※5 WiMAX: | WiMAX (Worldwide Interoperability for Microwave Access) is a new telecommunications standard based on the IEEE (Institute of Electrical and Electronics Engineers) 802.16 standard that provides wider coverage than wireless-LANs. |
Matching circuits or coupling circuits used in applications such as power amplifiers for mobile communication, WiMAX and LTE base stations; other related high frequency RF modules
example: GQM22M5C2H1R0B (for a product with 1pF capacitance and capacitance tolerance B）
| Capacitance | 0.5pF～100pF |
|---|---|
| Rated voltage | DC500V |
| Operating temperature range | -55℃～125℃ |
| Temperature characteristic | C0G (temperature coefficient: 0±30ppm/℃) |
| Withstand voltage | DC1250V |
| Q factor | 1 to 30pF: Q≧800+20C C：Nominal capacitance (pF) over 30pF: Q≧1400 (measured at a frequency of 1MHz) |
| Self-resonant frequency | over 4GHz（1pF） |
L=2.8±0.5 W=2.8±0.4 T=1.15±0.2 (Unit: mm)
Production begins in March, 2010.
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