A Double-Layer 2-D Monopulse SIW Slot Array Antenna Using Cavity Resonators

A double-layer 2-D monopulse substrate integrated waveguide (SIW) slot array antenna using cavity resonators is proposed in this paper. A cavity resonator is employed to generate the sum and difference signal at the output ports when different input ports are excited. Then a 2-D monopulse comparator is built up by combining three cavity resonators and a power divider, which shows a simple structure. The simulated results show that the proposed 2-D monopulse array antenna achieves an impedance bandwidth (|S
11
| < -12.5 dB) of 2.5% from 15.8 GHz to 16.2 GHz, and a null depth below -25 dB.