A rectangular slotted waveguide array for high power microwave applications

Abstract

In this paper, a rectangular slotted waveguide array is proposed for high power microwave applications. The antenna has been designed in the context of implementing a nonlethal high power transmission device onboard a drone to stop and neutralize non-cooperative vehicles. The proposed antenna comprises 16 slotted waveguides and a beamforming network, which is folded to maximize the compactness of the antenna. It has been specifically designed to send maximum EM energy in the range 20°-30° off-axis direction to avoid undesired ground reflections during operations. It has the ability to withstand a peak power of 500 kW. A measured gain of 27.7 dBi has been obtained at 3.15 GHz. The antenna has been successfully used to stop a car engine from a distance of approximately 9 meters.

An Efficient Slotted Waveguide Antenna System Integrated with Inside-Grooves and Modified Gaussian Slot Distribution

“…All the slot elements in SWA should radiate in phase to obtain higher efficiency. Therefore, slots are deployed in an alternating order on the broad side wall of the SWA around the central-line (see Figures 2a and 3) [30,31]. The non-uniform slot distribution approach for desired SLLs and slot displacement is illustrated in Figure 4.…”

“…By using the obtained Gaussian coefficients (listed in Table 2), an SLL value of −46.5 dB, which is 8 dB lower as compared to the Binomial distribution (−38.8 dB SLL), with the same gain value of 15 dB being achieved [10,33]. The slot displacements against these coefficients are obtained by using Equations ( 3) and ( 4) [5,23,30,31], and are listed in Table 2. The proposed modified SWA simulations have been performed in CST Microwave Studio, which provides −19.5 dB SLLs and a gain of 16.5 dBi with a reflection coefficient of −32 dB.…”