International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 05 | May 2022
p-ISSN: 2395-0072
www.irjet.net
DESIGN OF SLOTTED WAVEGUIDE ANTENNA FOR WIRELESS APPLICATION *1 *1M.Tech
Mr. Monish Raj. D, *2Dr. Rajesh Kumar. V
Student, School of Electronic Engineering (Sense), Vellore Institutions of Technology, Vellore School of Electronic Engineering (Sense), Vellore Institutions of Technology, Vellore
*2Professor,
---------------------------------------------------------------------***--------------------------------------------------------------------Abstract- Slotted waveguide antenna (SWA) arrays have circuit, resulting in improved efficiency due to no power different advantages in terms of design, weight, volume, loss at the waveguide end. Furthermore, regardless of power handling, directivity, and efficiency. For broadwall frequency, the primary beam is normal to the array, SWAs, the slot displacements from the wall centerline although these benefits come at the cost of a restricted determine the antenna's side lobe level (SLL). It operation band [3]. demonstrates how to use a simple novel approach to 2. Background create broad wall SWAs with acceptable SLLs. Given the needed SLL and operating frequency, this algorithm It demonstrated a planar SWA at 140 GHz. The discovers the slots length, width, locations along the feeder SWA, which consists of a feeding slot, an overrode length of the waveguide, and displacements from the cavity, and coupling slots, was developed to provide centerline for a given number of identical longitudinal excitations of the same amplitude but in alternating slots. Because all slots have the same length and the phases. An integrated power divider and phase shifter displacements are calculated using closed-form equations, were used to accomplish this [4]. Coupling was also done this approach is much easier than prior methods. A using longitudinal slots with the same lengths and offsets. computer programme was designed to do the design Kumar et al22 proposed using a planar SWA in the X-band. calculations and generate the needed slots data. The The desired current distribution was synthesised using a Taylor, Chebyshev, and binomial distributions are all used genetic algorithm paired with Schelkunoff's unit circle in instances. In these cases, elliptical slots are employed approach. The inclined coupling slot layer and a feed layer because their rounded corners make them more resistant with a power divider were the two layers that made up the in high-power applications. The results of prototyping and feeder. Zhang et al.23 have demonstrated a planar SWA testing a SWA are consistent with the design goals.. that operates at 40 GHz. It was made up of five layers, with side lobe levels suppressed using a four-corner-fed Keywords: SWA Antenna, SLL, E-Plane, H-Plane, Bandwidth, structure with angled coupling slots. An input aperture, Displacement and co-efficiency, microwave application feeding waveguide, and coupling slots made up the feeder. 1. INTRODUCTION Coburn et al24 used inclined coupling slots to feed four 8 x 8 sub array SWAs with one layer of feeding but four Rectangular Slotted Waveguide Antennas (SWAs) separate feeding [2][3] structures to produce low sidelobe transmit radiation through slots carved in the broad or levels for HPM applications. A planar SWA for HPM thin wall of a rectangular waveguide. As a result, the applications was also presented by Kim et al. Radiating radiating elements are integrated into the waveguide's slot plate, radiating waveguide, feeding waveguide, and Efeed system, resulting in a simplified design that does not plane septum divider were the four layers of the planar. To require balloons or matching networks [5].SWAs also have manage the feeding to the SWA elements, it was a low weight and small volume, as well as a high power additionally divided into 8 4 sub arrays, each coupled to a handling capacity, high efficiency, and an excellent multistage divider. reflection coefficient. They've been perfect for numerous radar, communications, navigation, and high-power Our project's main goal is to create a 10 * 10 microwave applications because of this. Depending on pencil-shaped SWA antenna and determine its gain, power how the wave propagates inside the waveguide, SWAs can handling, directivity, and efficiency. Slot displacements be resonant or non-resonant., The former is a standing from the wall centerline are used to determine the wave, whereas the later is a travelling wave [6]. Although antenna's side lobe level (SLL) and to examine the antenna the traveling-wave SWA has a higher bandwidth, it radiation pattern. To find the coefficency and requires a matching terminating load to absorb the wave displacement for related ways to compute the frequency and prevent it from being reflected, reducing its efficiency. range, models based on Taylor and Chebyshev It also has the drawback of the main beam direction being distributions are utilised. A prototype SWA has been dependent on the operating frequency. The end of the simulated and tested, with results that are consistent with waveguide in resonant SWAs is terminated with a short the design. © 2022, IRJET
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