As we know, 4G technology mainly covers LTE, Wimax, and UMB. LTE ia the popular development and application. 

LTE includes FDD-LTE and TDD-LTE. 

LTE is an abbreviation for Long Term Evolution. When the 3GPP standardization organization initially formulated the LTE standard, it was positioned as an evolutionary upgrade of 3G technology.
However, the development of LTE technology far exceeds the original expectations. Whether it is system architecture or transmission technology, it has a larger innovation than the original 3G system. At present, global operators have generally referred to various versions of LTE as "4G".

Talking the evolution of LTE，let's make a form.

See from the table, we know using different chipset or modules of LTE, the 4g router with external antenna supports the related LTE CAT. For example, the current popular is CAT4 and CAT6. If the 4G routers are installed with a CAT4 or CAT6 modem, it can support 150Mbps or 300Mbps data speed.