This paper present a novel design and development of inverted U-slot rectangular ring coupled monopole microstrip
antenna (IURCMMA) for quad band operation. The monopole microstrip antennas are commonly designed for wide band
operation. However, by placing the optimum ring slots in the form of slits on the radiating patch, the antenna can be made to
operate at different frequency bands. The proposed antenna operates in the frequency range of 1.5 to 10 GHz with a peak gain
of 8.69 dB and gives omni directional radiation pattern in both E and H planes. The measured and simulated results of return
loss are in good agreement with each other. With these features the proposed antenna may find many applications at microwave
frequency range
