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This article presents a novel planar monopole antenna with circular polarization. The 3‐dB axial ratio (AR) is achieved by: shifting a vertical monopole to the left edge of the substrate in conjunction with a laterally inverted L‐shaped ground plane. When viewed from the top, the antenna resembles an uneven T‐shaped structure rotated at 90°. Measur...
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The performance of a broadband circularly polarized crossed-dipole antenna for long-term evolution services is presented in this study. The antenna consists of a pair of trapezoidal-shape dipoles, four trapezoidal parasitic elements, and a pair of three-quarter printed rings that generate a 90° phase difference between the dipoles. The axial ratio...
A broadband circularly polarized (CP) cross‐dipole antenna with parasitic ground strips is designed. The antenna is composed of cutting‐off elliptical arms as driven element, four rotated grounded metal cuboids as parasitic element and a square ground plane as reflector. A pair of vacant‐quarter printed rings are adopted to feed the antenna by a se...
![Fig. 16. Scheme of the differential Helmholtz resonator (DHR) [23]: M...](profile/Igor-Sherstov/publication/338181940/figure/fig14/AS:971831431421977@1608714077929/Scheme-of-the-differential-Helmholtz-resonator-DHR-23-M-1-M-3-M-4-microphones_Q320.jpg)
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Citations
... However, some differences are observed at the end of the working band, especially for the S21 parameter. The reason for these disparities is either caused by the inaccuracy of printing [10], the soldering condition of the connectors [11], the size of SMAs [12], the length of the test cables [13], the location of the 50 load [14], the quality and the characteristic homogeneity of the substrate [15], equal to the walls of the backed reflector [16], or running tests in free space and its effects. Table II compares the features of the proposed antenna to its counterparts that were studied in literature. ...
This paper proposes a new dual-polarized
wideband base-station antenna. The designed antenna includes
four slotted diamond-shaped patches and two coaxial feed lines.
Additionally, the antenna is backed by a box-shaped reflector
that is employed to ensure a more stable radiation
characteristics over the operating bandwidth. Simulated result
demonstrates a wideband impedance bandwidth of 93% (1.68-
4.60 GHz, 2.92 GHz) with high matching performances. Having
wider bandwidth while maintaining a stable far-field
characteristics over this considerably capacious bandwidth
provides the antenna with the ability to cover multiple
frequency bands that exist within sub-6 GHz frequency
spectrum. Details of the characteristic mode analysis (CMA)
design procedure, simulated and measured gain and radiation
pattern characteristics will be presented at the conference.
... Recently, various printed monopole CPAs with perturbation geometries have been proposed by Li and colleagues. [10][11][12][13][14][15][16][17][18][19] A corner-truncated monopole antenna 10 with 23.1% 3-dB axial ratio bandwidth (ARBW) is designed by loading an inverted-L-shaped slit into the slot-embedded ground. A C-shaped monopole antenna 11 with 48.5% 3-dB ARBW is also put forward by using a cross-shaped patch as a parasitic element. ...
In this letter, a novel wideband circularly polarized (CP) monopole antenna (CPMA) with modified characteristics is proposed. The CPMA comprises a rectangular ground with an L‐shaped strip, an inverted L‐shaped monopole, and an asymmetric U‐shaped strip as a parasitic element. Note that the proposed CPMA is fed by a coaxial probe instead of the traditional microstrip feed. The L‐shaped strip in the rectangular‐ground and parasitic asymmetric U‐shaped strip are used simultaneously to excite multiple CP resonant modes, which increase the CPMA's CP bandwidth. Both the simulated and measured results validate the proposed design. The proposed CPMA features a −10‐dB impedance bandwidth ranging from 2.06 to 4.05 GHz (65.1% centered at 3.055 GHz), and a wide 3‐dB axial ratio bandwidth ranging from 1.78 to 4.44 GHz (85.5% centered at 3.11 GHz), which has a potential application in the satellite digital audio radio service system.
... Therefore, the application of this antenna, particularly to GSM 1800, GSM 1900 and LTE 2400, is limited. Another BCPPMA structure was proposed by Ellis et al. [142]. As shown in Figure 29a,b, the design of the BCPPMA is relatively simple because it does not use slots, stubs or parasitic strips. ...
... This design boosts the IBW and ARBW. Another BCPPMA structure was proposed by Ellis et al. [142]. As shown in Figure 29a,b, the design of the BCPPMA is relatively simple because it does not use slots, stubs or parasitic strips. ...
... A prototype of the asymmetric fed rectangular monopole antenna: (a) side view; (b) back view[142]. ...
With the rapid changes in wireless communication systems, indoor wireless communication (IWC) technology has undergone tremendous development. Antennas are crucial components of IWC systems that transmit and receive signals within indoor environments. Thus, the development of indoor technology is highly dependent on the development of indoor antennas. However, indoor environments with limited space require the fewest indoor antenna units and the smallest indoor antenna sizes possible. Hence, indoor antennas with compact size and broad applications have become widely preferred. In an IWC system, circularly polarised (CP) antennas are generally important, especially in dense indoor environments, because compared with linearly polarised (LP) antennas, CP antennas reduce polarisation mismatch and multipath losses. This paper combs through the existing studies related to three-dimensional (3D) geometry (nonplanar) or waveguide indoor antennas and the two common approaches to two-dimensional (2D) geometry (planar) indoor antennas, namely, broadband CP printed monopole antennas (BCPPMAs) and broadband CP printed slot antennas (BCPPSAs). The advantages, disadvantages and limitations of previous works are highlighted as well. These research works are summarised, compared and analysed to understand the recent specifications of BCPPMAs and BCPPSAs to generate the most appropriate design structure suitable for current IWC systems.
... In recent years, research has been dedicated to some of these requirements, where many design techniques have also been employed to achieve low-profile and compact size antennas [16][17][18]. While omnidirectional radiation pattern is usually desired for on-body communications, about 40-50% of radiated energy is lost when the antenna is placed close to/or on the human body due to its lossy nature resulting in an almost unidirectional radiation pattern [13][14][15]. Figure 1 illustrates the layout of the proposed antenna and its dimensions. The basic structure of the antenna consists of a slotted-stepped rectangular patch fed by a 3 mm 50 Ω microstrip feedline. ...
The novel compact size orthogonally fed 2 x 2 Multiple Input and Multiple Output (MIMO) array antenna for mid-band Fifth Generation (5G) wireless application is presented. The antenna configuration consists of diamond-shaped patches employed at the top of substrate. The V-shaped common ground slot structure is employed at the bottom of substrate. A broadband circular polarization is achieved by simply combining two circular polarization modes obtained from ground V slot and top patch feed structure. Mainly, the impedance bandwidth (IBW) and gain are enhanced by protruding slots on ground and cutting edges of patches. The measured result shows that 1.70 – 8.00 GHz (6.30 GHz) of IBW, 8.8 dBic of peak gain, and 3 dB axial ratio bandwidth from 1.81 – 3.87 GHz (2.06 GHz) are obtained. The proposed antenna performances are experimentally validated by fabricating and testing it for measured result analysis without using power divider.
The most important characterizing parameters which determine the antenna performance are axial ratio bandwidth, impedance bandwidth and gain of wireless systems. The improvement of these parameters are presented in the proposed antenna. Basically, the proposed design consists of an inverted L-shaped microstrip feed line and modified ground plane. The size of the antenna is 0.4 × 0.28 × 0.0128 λ0 (where λ0 be the free space wavelength at f r of 2.4 GHz). The designed antenna has been fabricated and the measured results of fabricated antenna are compared with the simulated results. It is found that the results are very good in agreement. Novelty of the research work is the improvement of axial ratio (less than 3 dB) bandwidth. As a result, the antenna is circularly polarized for a good amount of bandwidth which is desired in the modern communication system. Circularly polarized antenna is able to transmit and receive both vertically and horizontally polarized electromagnetic waves.
In this paper, a dual tapering Vivaldi antenna with impedance bandwidth in the frequency range of 2–15 GHz for UWB requests is introduced. The antenna structure includes an elliptical outer taper and a circular inner taper bounded by a rectangle. The proposed antenna has an average maximum gain of 7.3dBi and group delay changes of less than 0.3ns. Finally, the designed dual tapering antenna has a smooth transfer function.
