Smart Antennas: Recent Trends in Design and Applications
By Bentham Science Publishers
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About this ebook
This reference provides the reader with focused information about microstrip antenna design and applications. Readers are first introduced to the basic design of microstrip antennas. Subsequent chapters explain how microstrip antennas are suitable for practical applications. These chapters cover topics such as fractal and defected ground structure antennas, microstrip antenna evaluation and the use of microstrip antennas in mobile communications and IoT applications. Scholars, researchers and industrial professionals involved in the fields of electronics and electrical engineering as well as instrumentation will benefit from the information given in this book.
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Smart Antennas - Bentham Science Publishers
Introduction to Microstrip Antenna
Vivek Arya¹, *
¹ Department of Electronics Communication & Engineering, Faculty Of Engineering & Technology, Gurukul Kangri Vishwavidyalaya Haridwar, Uttarakhand 249404, India
Abstract
The very first idea of microstrip antenna was given by G. A. Deschamps in 1953 [1]. However, it did not receive practical exposure until the 1970s and it was further developed by Robert E. Menson [2]. The microstrip antennas are also called patch antennas and abbreviated as MSA. The microstrip antenna has various key advantages due to its low profile, light weight, low cost, and miniaturization capability [3-4]. There are various authentic applications of microstrip antenna such as satellite communication, Radar, WLAN, and WiMAX [5-9]. Nowadays, microstrip antennas are widely used for military and civilian applications such as broadcast radio, television, mobile systems, radio-frequency identification (RFID) system, vehicle guidance system, a global positioning system (GPS), vehicle collision avoidance system, multiple-input multiple-output (MIMO) systems, radar systems, determination of direction, surveillance systems, biological imaging, and missile systems, etc.
Keywords: Directivity, Gain, Patch antenna, Radiation pattern.
* Corresponding author Vivek Arya: Department of ECE, FET, Gurukul Kangri Vishwavidyalaya Haridwar, India. E-mail: [email protected]
1. Introduction
Several researchers and experts are working to improve the various quality parameters like bandwidth, directivity, and gain of microstrip antenna. Some other existing solutions, such as defected ground structures (DGS), electromagnetic bandgap (EBG) structures, and composite resonator structures, create the issues of spurious radiation and very high complexity. The new approach provides the solution for this problem using metamaterial. In 1968, Russian Physicist Prof. Vaselago was the first who theoretically proposed the concept of the metamaterial. Attractive and interesting properties of metamaterials play a very important and authentic role in antenna designing. Therefore, the metamaterial can be used for the performance enhancement of microstrip patch antennas, as shown in Fig. (1).
Fig. (1))
Geometrical Layout of Microstrip Antenna, 3-Dimensional view of microstrip antenna.
2. Feeding Techniques
The main objective of the feedline is to provide an input signal to the antenna for excitation. Nowadays, several feeding techniques are available for microstrip patch antennas. These feeding techniques or methods are categorized into two groups (a) contacting and (b) non-contacting technique, as shown in Fig. (2). In the contact technique, using connecting elements (like a coaxial probe, microstrip line, and inset fed or notch fed), the RF power is directly fed to the patch of an antenna. In non-contacting techniques, various feed methods, i.e.., proximity coupling, aperture coupling, and electromagnetic field coupling, are used for power transfer. The feeding technique selection for microstrip antenna plays a very crucial role because various antenna quality parameters such as return loss, bandwidth, and efficiency of an antenna are directly affected by it [10]. The surface waves and spurious feed radiation vary according to the thickness of the substrate that restricts the bandwidth of the microstrip antenna [11]. The co-axial feed and microstrip feed contacting techniques are the most commonly used in patch antenna designing, while in the non-contacting feed technique, the radiating patch is indirectly fed by the RF power, and then power is transferred to radiating patch. The most popular and commonly used techniques in non-contacting methods are aperture coupled feed and proximity coupled feed [12-14]. Com- parison of different feeding techniques is given in Table 1. Summary of advantages and disadvantages of different feeding techniques are given in Table 2. The general feeding techniques are discussed briefly as follows.
Fig. (2))
Classification of different feeding techniques.
Table 1 Comparison between different existing feeding methods.