Compact smile-like mode converter antenna with high power capacity level

ABSTRACT

This paper investigates the design, simulation, fabrication, and measurement of a compact mode converter antenna (MCA). The smile-like MCA (SMCA), at 12 GHz frequency, is designed. Due to the increase of the antenna cross-section, the probability of the electrical breakdown is dramatically reduced. Electrical breakdown may occur at very high-power outputs of the electromagnetic sources. The power capacity level of the SMCA is 648 MW. Also, the length of the antenna is 0.47$\lambda$. Simulation results indicate 99% mode conversion efficiencies. The return loss is −22 dB, the gain is more than 19 dB, and the sidelobe level is less than −37 dB. Also, the bandwidth is 200 MHz, for both E and H planes. The maximum main lobe deviation from the bore-sight is less than 0.2°. The simulation results are in good agreement with the measurement results.

KEYWORDS:

• Mode converter antenna
• HPM antenna
• high-efficiency mode convertor
• compact mode converter antenna