News | January 13, 2020

Resonant Power Handling Innovation Lowers RF Filter Costs For High-Power 4G Devices

Resonant Inc.(RESN), a leader in transforming the way radio frequency, or RF, front-ends are being designed and delivered for mobile handset and wireless devices, today announced its RF filter design innovation that allows the design of high-power RF filters using low-cost surface acoustic wave (SAW) processes resulting in devices capable of filtering at higher power (HiPower).

This breakthrough will first impact the fast-growing market for 4G high power user equipment (HPUE) devices. The HiPower SAW innovation was enabled by Resonant's high-precision Infinite Synthesized Networks (ISN) RF filter design tool.

Currently, Tier 1 4G smartphones have between 50-90 RF filters to support multiple antennas and radio frequencies needed for worldwide operation. Lower-cost processes will significantly reduce the bill of materials (BOM) cost.

HPUE devices, which are classified as power class 2 and operate at +26 dBm, were first announced by mobile network operators Sprint and China Mobile. Sprint, in particular, has actively promoted[1] its HPUE strategy saying it allows the company to expand the coverage range of its 2.5 GHz cell sites by 24% and to offer 49% faster download speeds when compared to its 1.9GHz network.

Resonant Details Innovation in new Whitepaper

Resonant has documented the performance of the HiPower SAW innovation in a recently posted whitepaper titled: Mobile Filter Innovation is Alive and Well in Extending the Reach of 4G. All filters that pass high RF power experience self-heating that limits the filter's maximum power. Through very precise simulation, Resonant is able to improve the power durability performance of filters made using the HiPower SAW designs.

This was shown by the results of a test described in the whitepaper which measured the power output of a standard SAW Band 3 transmit (Tx) filter and the Resonant HiPower SAW Band 3 filter as the input power was increased incrementally. The tests showed a linear progression for the SAW part until 32.5dBm of input power. The HiPower SAW part, however, continued its linear power performance up to an input power of 35dBm.

In the whitepaper, both of these power results were layered over simulations of the parts conducted by ISN, which predicted the power results very accurately.

"We know that power will be an issue in 5G devices, but our new whitepaper shows just how high power devices are emerging on 4G networks, making this new innovation essential for carriers that are moving to services based on mid-band spectrum," said George Holmes, Resonant Chairman and CEO. "This innovation is good news for Resonant as the market for 4G filters is still growing across the world, and demand for 4G filters will be strong even in 5G phones."

About Resonant Inc.

Resonant (RESN) is transforming the market for RF front-ends (RFFE) by disrupting the RFFE supply chain through the delivery of solutions that leverage our Infinite Synthesized Networks (ISN) software tools platform, capitalize on the breadth of our IP portfolio, and are delivered through our services offerings. Customers leverage Resonant's disruptive capabilities to design cutting edge filters and modules, while capitalizing on the added stability of a diverse supply chain through Resonant's fabless ecosystem-the first of its kind. Working with Resonant, customers enhance the connectivity of current mobile devices, while preparing for the demands of emerging 5G applications.

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Source: Resonant Inc.