1. A microstrip patch antenna is made from a rectangular patch with a = 2 cm, b = l/2, and w = 0.2 cm. The substrate has a relative permittivity of 2.5. Find the resonant frequency of the cavity for the TM10 mode.
2. If the microstrip patches described above are arrayed as a 100 × 100 array of patches, calculate the gain of the array and the maximum power density at a distance of 10 km