A Cylindrical Conformal Electronically Scanning Conical Beam Antenna Array With Fixed Frequency

A cylindrical conformal electronically scanning conical beam array with fixed frequency is proposed which is realized by using edge-loaded varactor diodes. The array consists of eight antenna elements with equal spacing in the circumferential direction, which can produce a large beam flare angle and small circumferential ripple. By changing the capacitance of the varactor diode, a conical beam flare angle scanning range of 42° - 62° can be achieved. The simulation results show that the gain is better than 5.3 dBi at the frequency of 9 GHz, the circumferential ripple is less than 1.5 dBi. This kind of conical beam scanning antenna with fixed frequency has a promising application in the field of missile fuzing system.

I. Introduction

In a non-rotating missile-based fuze system, a conical beam scanning antenna is required to detect the target in the oblique direction [1]. To detect high-speed targets such as bombers, the conical beam flare angle should be large, while to detect low-speed targets such as tanks, the corresponding conical beam flare angle should be small. Therefore, to increase the adaptability of the fuze system to a variety of targets with different relative speeds of movement, the conical beam antenna should have the capability of beam flare angle scanning [2].