4G/LTE PCB antenna

[metal]

How can I design 4G/LTE PCB antenna?

[Sideshow Bob]

Try this Google searh
https://www.google.com/search?q=Design+Strategy+for+4G+Handset+Antennas+and+a+Multiband+Hybrid+Antenna
I leave it to you to filter out. But the first page should give you what you need more or less

[crunx]

One has to be aware that different regions in the world have different frequencies in use.
For example Wikipedia has a list:
https://en.wikipedia.org/wiki/LTE_frequency_bands

In general, designing a good multi-band antenna is getting trickier with many frequencies, and the design will have also more compromises leading to less optimum performance. Therefore one has to tune the antenna to support relevant bands.

[metal]

it is 1800MHz.

Based on this: http://buildyourownantenna.blogspot.com/2014/07/double-biquad-sector-antenna-for-1700-mhz-4g-lte.html

[Rafa]

If it's PCB antenna will depend on board parameters, so to begin start with antenna magus*. Its easy to use whith models provided.
If you need to tune it perfect at most, use hfss*. Not that easy to learn, search youtube to find help movies.
I tried and used them to desing a gsm (900) band antenna and it worked well.

*find both here on site.

[nPn]

Is what you're designing so cost sensitive or high volume that you can't use a chip antenna? It's bloody difficult to tune and verify trace antennae even with the right tools (spec analyser etc). Way less non-recurring engineering cost to route a 50-ohm trace from balun to chip antenna or u.fl socket.

See this video from Michael Ossmann about RF design without going very custom: https://www.youtube.com/watch?v=TnRn3Kn_aXg

[metal]

actually it is one, for home use :-)

[roscoe]

Either way (PCB integrated, discrete chip, or SMA to off board antenna) you're probably going to need a filter and matching network if you care at all about performance.  As was pointed out, you'll likely need at least an SA -- but you might be better off with a VNA.