Current distribution problem in HFSS

How can current distribution

plot Mag_JSurf in HFSS can be increased for microstrip antenna? Mine distribution is almost blue shows low current level everywhere.
At edges , should it be red showing more radiation?
should it be red also in input port also.
any comment.....

My guess is that the plot is not shown at a resonance frequency, and that the patch is insufficiently meshed.

what does mean by insufficiently meshed. what is sufficient mesh size , i took 20.
my question still unanswered that "How can current distribution plot Mag_JSurf in HFSS can be increased".
Can we increase input in HFSS?
Is the only way to increase gain is array of antenna. (for constant- freq, w, er, h)

I'm not sure what you mean by increasing a plot, but I assume you mean changing the scale. You can do this by double-clicking on the scale itself.
You can also increase the excitation magnitude under HFSS->Fields->Edit Sources.
By insufficiently meshed, I mean your mesh elements are too large, and it is likely your simulation is not properly converged. You should change the convergence criteria (e.g. Delta S) to be more stringent.

Good Luck

Increasing means increasing current magnitude at edges (red level) , more radiation, hence more gain. My simulation is properly converged on designed resonant freq. good impedance matching but poor gain.

Increased current density does not equate with increased gain.

If your antenna is properly designed and simulated, then what's the issue?