With the rollout of a global mobile standard like 4G LTE there are 20 or more frequency bands and operators have found themselves struggling with RF front end circuit technologies not up to the task, writes Jeremy Hendy, v-p sales and marketing, Nujira.
The problems facing designers of RF front-ends for handsets and other cellular terminals have become increasingly challenging. For the last decade, engineering teams have been firmly focused on optimising and differentiating their digital modem chipsets, perhaps at the expense of RF front end development.
Source:
http://www.electronicsweekly.com/Articles/2013/02/05/55495/4g-lte-may-hit-a-frequency-cliff.htm
