Do microwave systems typically require different antennas at higher frequencies?
• Yes. Grid antennas commonly used at 2 GHz are not available at higher frequencies. Also, the size of the antenna varies by frequency. For example, a 6 GHz microwave radio system may use a 6-, 8- or 10-foot antenna, depending on factors such as transmit power, receiver sensitivity, path length and interference control: What is the impact on the transmission line system? 2 GHz microwave systems typically use coaxial cable as the transmission line between the radio equipment and the antenna. Because of attenuation considerations, elliptical waveguide is nearly always the transmission line of choice for higher frequencies. For this reason, it will be necessary to replace the coaxial line with elliptical waveguide. You should consider three factors when replacing the transmission lines: • Transmission line attenuation. For system path recalculations, you should consider the difference in signal attenuation between the existing coaxial line and the new elliptical waveguide. • Transmission
