Isolator Shrinks Down To Fit Digital Mobile Phones

Varying and evolving standards make it hard for components to attain widespread implementation. As a result, components may choose to broaden their appeal. For example, Murata's 2-GHz-band isolator for the digital-mobile-phone market is significantly smaller and lighter. It also boasts increased performance levels. As a result, the components in this product line—dubbed the CES30 series—can be used in a variety of mobile-phone systems (1.5-GHz-band PDC, 2-GHz-band W-CDMA, and 1.9-GHz-band PCS).

The components in the CES30 series weigh only 0.06 g. They measure 3.2 mm² by 1.6 mm high. In addition to their reduced size and weight, they make electrical-characteristic improvements. For example, they achieve an insertion loss of 0.5 dB maximum with an isolation of 14.5 dB minimum in the 1920-to-1980-MHz frequency band at normal temperatures. Compared to a voltage standing wave ratio (VSWR) of 1.4 for previous products, they flaunt a VSWR at the input of 1.25 maximum. By placing the isolator at the power amplifier's output, the series also improves the impedance-matching performance. Finally, implementing a lead-free surface-mounting process allows the isolator to be reflow-soldered at a peak temperature of 260°C.

The company also simplified the product design. Compared to the previous process of mounting copper electrodes around a Ferrite, its new high-precision electrode-patterning technology creates a monolithic structure. A ceramic multi-layered substrate can integrate these capacitors with a resistor. Samples of the CES30 series 2-GHz-band isolator are available. The current lead time is four to six weeks. Please contact Murata for high-volume pricing.