Combined system of the microstrip antennas with different frequencies

The combined system with microstrip antennas (f
1
=1.85GHz; f
2
=3.7GHz, f
3
=1.75GHz, f
4
= 3.5GHz) is presented. The measurements of the prototype characteristics have shown that elevation angle of peak directivity of the antennas is oriented to zenith. Simulated S
11
at stated frequencies with the following minimum values of S
11
= −34dB, f=1.85GHz; S
11
=−21dB, f=3.7GHz; S
11
= −22dB, f=1.75GHz; S
11
=−19dB, f=3.5GHz are observed.