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Breakthrough filter technology targets 5G

Breakthrough filter technology targets 5G

Technology News |
By Wisse Hettinga



The breakthrough is a fundamentally novel resonator, the building block of an RF filter. The technology is important because it is designed to offer a cost-effective filter operating at frequencies of 3 GHz and higher, making it the first filter technology designed from the beginning for 5G.

“The high bandwidth 5G data services will operate at frequencies of 3.5 GHz – 6 GHz and higher, but today’s best filter technologies have limitations operating at these frequencies,” said George B. Holmes, CEO of Resonant. “The early results from our XBAR initiative are very promising and we are working hard to provide a cost-effective, high-performance option for 5G services.”

Using its ISN (Infinite Synthesized Networks) technology, Resonant has developed this new structure, which in simulations outperforms best-in-class FBAR resonators. The company filed patent applications on the technology earlier this year.

Resonant believes that its patented ISN technology will enable the company to design complex filter products at approximately half the unit cost and in approximately half the time of traditional approaches. A large suite of proprietary mathematical methods, software design tools and network synthesis techniques enable it to explore a much larger set of possible solutions and quickly derive the optimum solution.


These improved filters still use existing manufacturing methods (such as SAW, TC SAW and BAW/FBAR) and depending on the requirements and capabilities of the given foundry, ISN offers ability to improve design efficiency through shorter design times and deliver designs utilizing lower cost manufacturing processes with performance comparable to designs using higher cost methods (i.e., BAW/FBAR). While most of the industry designs surface acoustic wave filters using a coupling-of-modes model, Resonant uses circuit models and physical models. Circuit models are computationally much faster, and physical models are highly accurate models based entirely on fundamental material properties and dimensions. Resonant’s method delivers excellent predictability, enabling achievement of the desired product performance in roughly half as many turns through the fab.

ISN technology will also enable Resonant to design novel filters that are more than simple replacements, but rather can enable an architecture change, or can provide a step function improvement in performance, size and cost to a handset manufacturer.  These include:

  • Triplexers/Multiplexers – wideband, low loss multiplexed filters which allow efficient sharing of antennas. As more spectrum becomes available above 2.5 GHz, the focus will be in minimizing the losses at the higher frequency.
  • Multi-passband Filters – small size, low loss filters to maximize PCB space and minimize loss, particularly suited for CA applications. No switching elements further reduces size and cost for CA.
  •  Reconfigurable Filters – electronically programmed in real time for different RF frequency bands so that one filter can do the work of many and therefore replace multiple filters and significantly lower the cost and size of RF front-ends. The widespread implementation of CA is changing the requirements for a reconfigurable filter.

www.resonant.com

 

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