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Antennas and Propagation

In this subdiscipline: 4,123 papers

Discipline summary

Our subject may be divided in two main sub-subjects. The first one is Microwave Filter. And another sub-subject is Metamaterial. Now, we will be present a brief idea to the mentioned above:
Microwave Filters play important roles in many RF/Microwave applications. They are used to separate or combine different frequencies. The main filter functions are to reject undesirable signal frequencies outside the filter pass-band. The electromagnetic spectrum is limited and has to be shared; filters are used to select or confine the RF/Microwave signals within assigned spectral limits. Emerging applications such as wireless communications continue to challenge RF/Microwave signals with ever more stringent requirement higher performance, smaller size, lighter weight, and lower cost [1, 2].
Metamaterials are artificial; a metamaterial is a macroscopic composite having a synthetic periodic or non-periodic cellular architecture designed to produce an optimized combination, not available in nature, of two or more responses to specific excitation [4, 5 and 16]. Metamaterials have been a subject of great interest in the scientific community since the beginning of this millennium, when it was experimentally demonstrated by Smith and Shelby [3, 4]. The existence of left handed wave propagation in an artificial medium composed of metallic wires and split ring resonators (SRRs) [5, 12, 13, and 15]. This represented the corroboration of the seminal (theoretical) work carried out by Veselago in 1968, where the exotic properties of artificial structures with simultaneous negative permeability and permittivity were anticipated [6, 10, 11, and 14]. The study of metamaterials has been very active in recent years. In microwave engineering, applications include the design of compact filters [7, 17, 18 and 19] and other microwave components with superior performance and/or exhibiting novel functionalities such as frequency selectivity, roll of band edge and miniaturization of size [8–9].

Popular papers

  1. Using the freedom of design that metamaterials provide, we show how electromagnetic fields can be redirected at will and propose a design strategy. The conserved fields-electric displacement field D, magnetic induction field B, and Poynting vector…
  2. In this review the author traces the history of antennas and some of the most basic radiating elements, demonstrates the fundamental principles of antenna radiation, reviews Maxwell's equations and electromagnetic boundary conditions, and outlines…
  3. We demonstrate a composite medium, based on a periodic array of interspared conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective…
  4. The 4th edition of this classic text provides a thorough coverage of RF and microwave engineering concepts, starting from fundamental principles of electrical engineering, with applications to microwave circuits and devices of practical importance.…
  5. We discuss the validity of standard retrieval methods that assign bulk electromagnetic properties, such as the electric permittivity epsilon and the magnetic permeability mu, from calculations of the scattering (S) parameters for finite-thickness…
  6. We analyze the reflection and transmission coefficients calculated from transfer matrix simulations on finite lengths of electromagnetic metamaterials, to determine the effective permittivity (epsilon) and permeability (mu). We perform this analysis…
  7. To address the need for fundamental universally valid definitions of exact bandwidth and quality factor (Q) of tuned antennas, as well as the need for efficient accurate approximate formulas for computing this bandwidth and Q, exact and approximate…

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