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[majidmad]

Hi friends
I'm going to design an MIMO antenna for cellphone that is suitable for 4G cellular systems. But I have some vague that I looked for a lot and found nothing. Would you please give me a clue for following issues:
1. What is the frequency and frequency range for UL and DL in LTE-Advanced (4G). I found that the spectrum flexibility for LTE release 10 are:
• 450–470 MHz band
• 698–862 MHz band
• 790–862 MHz band
• 2.3–2.4 GHz band
• 3.4–4.2 GHz band
• 4.4–4.99 GHz band
So what does that mean? Should we design an antenna in one of the aforementioned frequency ranges or it should cover all ?

2. How much is the required bandwidth for LTE-Advanced in designing the antenna. As I found the minimum is 40 MHz and the maximum limit is 100 MHz. But some articles mentioned this bandwidth will provide by Carrier Aggregation of 2 up to 5, 20 MHz contiguous spectrum. So how much bandwidth should we consider in our design? 20 MHz (same before?) or 40 MHz ?
3. As some articles mentioned it required at most 88 MIMO. Locating 8 antennas on cellphone is impossible. I need to know that is it possible to locate 2 antennas on cellphone and support the required bit rate in 4G or we need at least 4 antennas?

So appreciated.

[Schubert]

Where did you get this info?

I haven't heard of any bands in operation at 450 MHz for cellular (common smartphone) usage, for 4G, 3G, 2G, whatever. So I think that one is out.

Many phones target a specific data carrier - like T-Mobile, Verizon or AT&T in the US, which may only have 2 bands they operate at (like Band V [850 Mhz] and Band II [1880 MHz], for instance).

The antenna should typically cover all the bands for the voice/data carrier that is selling the phones. Whatever bands they operate at, their phones should work at.

LTE with 8x8 MIMO? THat may be pretty long range. At most I think you could try to do 2x2 for LTE.

Where did you get the carrier aggregation info?

[majidmad]

Thank you for your reply
From the following website I've got those info about spectrum: http://www.eetimes.com/design/microwave-rf-design/4212869/Introducing-LTE-Advanced
Also I've downloaded an article from Agilent that it mentioned to those spectrum, too. I don't know if there is a way to upload that pdf here or not!
Also for carrier aggregation I found it here: http://www.3gpp.org/LTE-Advanced