Great article. I believe there is a typo in "while providing 36 dB rejection at 4.4 GHz (Band n41), only 200 MHz away. This is definitely promising." Should be n79, not n41
From filters' perspective, what advantages, disadvantages, challenges or opportunities you foresee if future communication goes to higher frequency bands, e.g. millimeter waves? More specifically, do you think it will become harder or easier to make filters?
At mmWave, the wavelength is smaller and electromagnetic resonance filters might be small enough. This is a problem for cellular frequencies below 6GHz, which is why acoustic-wave filters work so well. Also, the spectrum is not as crowded at mmWave compared to lower frequency bands. Filter selectivity need not be as high.
That being said, people have been successful in making acoustic-wave filters at mmWave. So maybe that still has uses. Also, I don't know of any startups or companies focused on using a hybrid approach (acoustic+LC) to make filters for future wireless communications. Definitely an opportunity there!
The quality of this week's newsletter is outstanding; I really appreciate you explaining your best expertise in a language that other non-experts can easily understand!
Great article. I believe there is a typo in "while providing 36 dB rejection at 4.4 GHz (Band n41), only 200 MHz away. This is definitely promising." Should be n79, not n41
Great catch, I'll correct it right away.
One more question if I may.
From filters' perspective, what advantages, disadvantages, challenges or opportunities you foresee if future communication goes to higher frequency bands, e.g. millimeter waves? More specifically, do you think it will become harder or easier to make filters?
At mmWave, the wavelength is smaller and electromagnetic resonance filters might be small enough. This is a problem for cellular frequencies below 6GHz, which is why acoustic-wave filters work so well. Also, the spectrum is not as crowded at mmWave compared to lower frequency bands. Filter selectivity need not be as high.
That being said, people have been successful in making acoustic-wave filters at mmWave. So maybe that still has uses. Also, I don't know of any startups or companies focused on using a hybrid approach (acoustic+LC) to make filters for future wireless communications. Definitely an opportunity there!
All good points and took me to ponder a bit, thank you!
Thank you, Vikram!
The quality of this week's newsletter is outstanding; I really appreciate you explaining your best expertise in a language that other non-experts can easily understand!