Designing a Dual-Band Printed Monopole Symmetric Tooth-Shaped Antenna
01 Jul 2020-Lobachevskii Journal of Mathematics (Pleiades Publishing)-Vol. 41, Iss: 7, pp 1354-1362
TL;DR: In this article, a symmetrical tooth-shaped radiator is obtained from a rectangular radiator by adding small symmetrical rectangular cutouts on its two sides, and regression models are constructed for each type of the antenna.
Abstract: Printed monopole antennas with a rectangular radiator as well as with a symmetrical tooth-shaped radiator are considered. The tooth-shaped radiator is obtained from a rectangular radiator by adding small symmetrical rectangular cutouts on its two sides. The antennas with four-, six- and eight-tooth-shaped radiators are considered. For the antennas, the influence of the radiator geometry parameters on the two base resonance frequencies is studied. The common features and characteristics of the dependences of the resonances on the radiator parameters are revealed for the considered tooth-shaped antennas. Regression models are constructed for each type of the antenna. In the obtained models, the values of the two base resonances are functions of the length and width of the radiator as well as of the depth of rectangular cutouts on it. The designing of dual-band printed monopole tooth-shaped antennas for various numbers of cutouts on the radiator is proposed. For the design of the shape of the radiator antennas, regression models are used, which allow to obtain the parameters of the radiator for given resonance frequencies. Examples of obtained antennas with various numbers of teeth are given. Conclusions about the applicability of antennas of this type for operation on two bands are given.
TL;DR: In this paper, the problem of the electromagnetic wave diffraction by a rectangular perfectly conducting metal plate is considered and the solution of the problem is reduced to the integral equations for the tangential components of the magnetic intensity vector on the metal surface.
Abstract: The classical problem of the electromagnetic wave diffraction by a rectangular perfectly conducting metal plate is considered. The solution of the problem is reduced to the solving integral equations for the tangential components of the magnetic intensity vector on the metal surface. The collocation method is applied to the equation with the representation of the sought functions in the form of a series in the Chebyshev polynomials of the 1st and 2nd kind. Numerical experiments have been carried out for a different number of terms of the Fourier series of the sought functions and a different number of collocation points. Graphs comparing the results obtained for various parameters are presented. It is shown that an increase in the number of collocation points leads to a greater stability of the solution. It is concluded that there is no clear-cut convergence of the solution with this choice of collocation points.
TL;DR: This work presents an innovative multimodal context mining framework to inspect and infer human behaviour in a more holistic fashion and extends beyond the state-of-the-art, since it not only explores a sole type of context, but also combines diverse levels of context in an integral manner.
Abstract: There is sufficient evidence proving the impact that negative lifestyle choices have on people’s health and wellness. Changing unhealthy behaviours requires raising people’s self-awareness and also providing healthcare experts with a thorough and continuous description of the user’s conduct. Several monitoring techniques have been proposed in the past to track users’ behaviour; however, these approaches are either subjective and prone to misreporting, such as questionnaires, or only focus on a specific component of context, such as activity counters. This work presents an innovative multimodal context mining framework to inspect and infer human behaviour in a more holistic fashion. The proposed approach extends beyond the state-of-the-art, since it not only explores a sole type of context, but also combines diverse levels of context in an integral manner. Namely, low-level contexts, including activities, emotions and locations, are identified from heterogeneous sensory data through machine learning techniques. Low-level contexts are combined using ontological mechanisms to derive a more abstract representation of the user’s context, here referred to as high-level context. An initial implementation of the proposed framework supporting real-time context identification is also presented. The developed system is evaluated for various realistic scenarios making use of a novel multimodal context open dataset and data on-the-go, demonstrating prominent context-aware capabilities at both low and high levels.
TL;DR: In this paper, a novel printed monopole antenna with dual wideband is presented for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications.
Abstract: A novel printed monopole antenna with dual widebands is presented for simultaneously satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The antenna structure consists of a rectangular monopole with a microstrip feedline for excitation and a trapezoid conductor-backed plane for band broadening. The measured 10 dB bandwidth for return loss is from 2.01 to 4.27 GHz and 5.06 to 6.79 GHz, covering all the 2.4/5.2/5.8 GHz WLAN bands and 2.5/3.5/5.5 GHz WiMAX bands
TL;DR: In this article, the design equations for lower band-edge frequency for all the regular shapes of printed monopole antennas with various feed positions were presented, where the length of the feed transmission line is a critical design parameter.
Abstract: This paper presents the design equations for lower band-edge frequency for all the regular shapes of printed monopole antennas with various feed positions. The length of the feed transmission line is a critical design parameter of these monopole antennas. Design curves for the length of the feed transmission line for various lower band-edge frequencies for all these regular shaped monopoles have been generated. A systematic study has been presented to explain the ultra-wide bandwidth obtained from these antennas with an example of elliptical monopole antenna.
TL;DR: In this paper, a triangular tapered monopole antenna is proposed for ultra wideband (SWB) SWB applications with an exponential curve in the feed region and triangular antenna line.
Abstract: A novel and compact super wideband (SWB) exponentially tapered feed region and patch printed monopole antenna is proposed. This antenna is fed by a 50-Ω triangular tapered feed line. The antenna operates over a bandwidth of 2.5-80 GHz with a return loss of 10 dB or more. The dimensions of the proposed antenna are 40 × 30 × 1.6 mm 3 . An exponential curve is employed in the feed region and a triangular tapered feed line is used. The ground plane feed gap is optimised to 1.3 mm. The proposed tapered monopole antenna has demonstrated an ultra-large bandwidth with satisfactory radiation properties. Two particular antennas are examined, one with a rectangular feed line and another with a triangular tapered feed line. The performance of the antenna in frequency domain is investigated, and a good agreement is achieved between the simulation and experimental results. In addition, the time domain characteristics of the proposed antenna are evaluated experimentally. This antenna can be used in ultra-wideband or SWB applications.
TL;DR: Two new dual-frequency microstrip antennas are designed with the use of electromagnetic simulation software—High Frequency Structure Simulator (HFSS) that have a higher gain and a favourable transmission characteristic in the working frequency range, which is in accordance with the requirements of WLAN communication.
Abstract: Wireless local area network (WLAN) is a technology that combines computer network with wireless communication technology. The 2.4 GHz and 5 GHz frequency bands in the Industrial Scientific Medical (ISM) band can be used in the WLAN environment. Because of the development of wireless communication technology and the use of the frequency bands without the need for authorization, the application of WLAN is becoming more and more extensive. As the key part of the WLAN system, the antenna must also be adapted to the development of WLAN communication technology. This paper designs two new dual-frequency microstrip antennas with the use of electromagnetic simulation software—High Frequency Structure Simulator (HFSS). The two antennas adopt ordinary FR4 material as a dielectric substrate, with the advantages of low cost and small size. The first antenna adopts microstrip line feeding, and the antenna radiation patch is composed of a folded T-shaped radiating dipole which reduces the antenna size, and two symmetrical rectangular patches located on both sides of the T-shaped radiating patch. The second antenna is a microstrip patch antenna fed by coaxial line, and the size of the antenna is diminished by opening a stepped groove on the two edges of the patch and a folded slot inside the patch. Simulation experiments prove that the two designed antennas have a higher gain and a favourable transmission characteristic in the working frequency range, which is in accordance with the requirements of WLAN communication.
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