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International Research Journal of Engineering and Technology (IRJET)

e-ISSN: 2395-0056

Volume: 10 Issue: 04 | Apr 2023

p-ISSN: 2395-0072

www.irjet.net

ANTENNA ARRAYS FOR MILLIMETER WAVE COMMUNICATION: A REVIEW Arpit Yadav1, Mr. Nadeem Ahmad2 1M.Tech, Electronic and Communication Engineering, GITM, Lucknow, India

2Assistant Professor Electronic and Communication Engineering, GITM, Lucknow, India

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Abstract - Antenna arrays are groups of antennas that are

Today, antenna arrays continue to play a critical role in modern communication systems, from cell phone networks to satellite communication systems. Advances in antenna array technology have made it possible to deliver wireless connectivity to more and more people, in more and more places, around the world.

used to transmit or receive radio signals. These arrays are made up of multiple individual antennas, also known as elements, that are positioned in a specific pattern to enhance the performance of the overall system. The main advantage of antenna arrays is that they can provide a beam of radio energy in a specific direction, which can increase the strength of the signal in that direction and reduce interference from other sources. This makes antenna arrays particularly useful for applications such as wireless communication, radio astronomy, and radar systems. There are different types of antenna arrays, including linear, planar, and circular arrays, each with unique properties and applications. The specific design of an antenna array depends on the desired frequency, radiation pattern, gain, and other requirements for the system. Antenna arrays are a key component in many modern communication systems and play a crucial role in maintaining reliable and efficient wireless connectivity.

1.1. Phased Array A phased array is a special sort of antenna array that uses electronic phase shifting to guide and control the path that a beam of radio waves travels along. Phased arrays are often used in communications systems. Each antenna in a phased array is connected to a computer-controlled electrical system that alters the phase of the signals that are being sent or received by each element in the array. This allows the phase of the signals to be precisely adjusted. Because of this, the array may perform the duties of a single antenna. Because of the precise control that can be exercised over the relative phases of the signals, the phased array can generate a highly directed beam that can be aimed in a variety of directions. This is made possible by the fact that the relative phases of the signals can be precisely controlled. Phased arrays provide several major advantages over traditional antenna arrays, which are the most common kind of array. For instance, since the direction of the beam can be adjusted electronically, a phased array may be configured to follow a moving object, such as an airplane or a satellite, without the need to physically move the antenna. This eliminates the requirement for the antenna to be physically moved. This is made feasible by the fact that the beam's direction may be electrically adjusted, making it possible to achieve the aforementioned goal. Since this is the case, phased arrays are particularly useful for applications such as radar, navigation, and communication systems. Since of their adaptability, phased arrays are suitable for a diverse range of uses because they can be programmed to operate over a large range of frequency ranges. This makes them suitable for a variety of different applications. They are useful in a diverse array of applications, including military radar systems, systems for regulating air traffic, and systems for communicating by satellite, amongst others. It is now possible, with developments in digital signal processing and microwave electronics, to produce high-performance phased arrays that are more compact, efficient, and versatile than they have ever been before. These phased arrays have a broad range of potential uses in many different contexts. As a

Key Words: beam forming; beam-scanning; millimeter-wave (mm-wave); 5G; line-of-sight (LOS); phased arrays.

1. INTRODUCTION The history of antenna arrays dates back to the early days of radio communication. As early as the late 19th century, engineers and scientists were experimenting with arrays of simple dipole antennas to improve the performance of wireless communication systems. During World War II, antenna arrays became an important tool for military radar systems, which used them to detect enemy aircraft. These early arrays were often large and cumbersome, but they provided the necessary performance for the radar systems of the time. In the post-war period, the development of microwave technology and the increasing demand for wireless communication led to rapid advancements in antenna array technology. The introduction of new materials and manufacturing techniques made it possible to produce smaller, more efficient arrays that could be used in a wider range of applications. In the 1960s and 1970s, the development of computer-aided design and simulation tools revolutionized the design and analysis of antenna arrays. This made it possible to optimize the performance of arrays in ways that were previously not possible, leading to even more advanced arrays for a variety of applications.

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