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Aiming to realize an end-on-fire antenna with band rejection for UWB system, this paper proposes a planar quasi Yagi antenna with dual-dipole structure. The antenna uses a dual-dipole to generate reverse surface currents at some specific frequency points. This mechanism is used to design band rejection. Simulated and measured results show that the bandwidth of the proposed antenna is from 3.37 GHz...
Various domestic appliances that can use WiFi are becoming more common. Therefore, it is necessary to establish a design method for installing a small antenna within these appliances. In this paper, a model that has a dipole antenna unified with an artificial magnetic conductor (AMC) substrate inspired small antenna is proposed, and its radiation and impedance characteristics are shown.
Narrow bandwidth is a challenging problem for designing platform-mounted electrically small antennas in the high-frequency (HF) band. In this paper, we demonstrate a process that can be used to improve the bandwidth of a platform-mounted HF antenna or antennas by taking advantage of the presence of the platform. Specifically, we examine a simplified model for the Expeditionary Fighting Vehicle (EFV)...
An electrically small Egyptian axe dipole antenna has been designed and integrated into a glass fiber reinforced polymer (GFRP), a structural material now commonly found in most mobile platforms. The integration is accomplished by sewing the antenna with conductive threads into the GFRP prepreg and accounting for dimensional variations after curing under high temperature and pressure in an autoclave...
In this paper, a UWB monopole antenna for GPR applications is presented. The antenna offers a large bandwidth from 250 MHz to more than 6 GHz and is relatively compact in size (20 cm × 22.5 cm) than other antennas operating in same frequency range. The time domain performance of this antenna is also analyzed for use it in impulse based radar systems. A prototype of antenna was manufactured and tested...
An implantable miniaturized planar inverted-F antenna (PIFA) that can operate over 2.45 GHz Industrial, Scientific, and Medical (ISM) band which occupies a small volume of 92 mm3 is proposed. The impedance characteristics of the proposed antenna are measured using experimental tissue mimicking phantoms. The proposed compact PIFA has a size of 8.1×7.1×1.6 mm3 which is tested using both numerical and...
A superdirective array of electrically small dipole radiators can effectively be used as a compact and lightweight first-order probe (a directive antenna radiating predominantly spherical modes with the azimuthal index |μ| = 1) in spherical near-field antenna measurements at low frequencies. This contribution shows that a very narrow frequency bandwidth peculiar to superdirective antennas can be extended...
This work describes a novel compact design of planar ultra-high-frequency (UHF) tag antenna for radio-frequency identification (RFID) system by introducing an L-shaped metal plate connecting with the spiral monopole antenna. The obtained impedance bandwidth of 12 MHz can meet with Taiwan UHF operating band (922 ∼ 928 MHz). The overall antenna size is only 13 × 9 × 1.6 mm3. The measured peak gain and...
In this paper, the design, simulation and evaluation of a wide band printed log-periodic dipole antenna array, which could be used to detect the presence of radiolytic components of the ubiquitous water molecule, is presented. The antenna was fabricated on an FR-4 substrate. The design was simulated and the characteristics such as the scattering parameter, VSWR, input impedance, etc. studied over...
In this paper, a novel design of a corrugated microstrip antenna with wideband characteristics is proposed. The suggested antenna consists of an arc-shaped edge and a ground plane which has been modified. The difference from the other traditional antennas is in the modification of the ground plane. The corrugated ground plane is present below the feed line and partially present just below the radiating...
Improving antenna arrays characteristics such as power consumption, cost and complexity has gained wide attention in the context of cognitive radio networks. One antenna array configuration that offers great potential is the electronically-steerable parasitic array radiator (ESPAR) antenna. In this paper, we propose a transmitter patch ESPAR antenna system for underlay spectrum sharing in cognitive...
A new low-profile planar eleven antenna is designed as a wideband MIMO antenna for micro-base stations in future wireless communication systems. The design criterion is to minimize both the reflection coefficient and the ratio of the required average received power over the threshold for 95% of the total probability of detection (PoD) in the Rich Isotropic Multipath (RIMP) and random Line-of-Sight...
This paper introduces a millimeter-wave (MMW) high bandwidth antenna on low-cost flexible PET substrate for future 5G wireless networks. The antenna design consists of a rectangular patch structure having symmetrical arrangements of slots on both sides of patch. The antenna consists of a coplanar waveguide (CPW) feed with a rectangular aperture in the ground plane. The proposed antenna shows a high...
Machine-to-Machine (M2M) communications are increasingly important as an enabler for emerging Internet of Things (IoT) applications. In this paper, two types of UHF antennas for M2M communications are summarized. Both types of the antennas operate around 480MHz and are low profile with a size of 0.1λ. One type is based on magneto-dielectric material, and the other is based on a novel structure design...
A design of a dual linearly polarized superdirective array of electrically small self-resonant magnetic dipole elements is presented. The array exhibits the bandwidth of 12 MHz at 435 MHz central frequency with the directivity exceeding 9 dBi and the parasitic azimuthal modes suppressed below −45 dB. With these characteristics the array can effectively be used as a compact and light-weight first-order...
Two different array of dipoles above infinite electric ground plane are optimized for bandwidth using particle swarm optimizer, concept of self and mutual impedances and impedance quality factor. It is found that it is the interaction of mutual radiated power that limits the bandwidth, rather than stored energies.
A wideband ±45° dual-polarized base station antenna for 2G/3G/LTE bands is proposed in this paper. By embedding a metallic strip to the traditional loop dipole antenna and adopting T-shaped coupling feeding structure, a wideband impedance bandwidth from 1.7–2.7GHz with SWR≤1.5 was achieved, the isolation of two ports was more than 25dB. A stable 3-dB beamwidths of 65.82°±3.64° at horizontal plane...
Thin resonant dipoles and monopoles are typically narrowband. Increasing the thickness of the cylindrical dipole or monopole radiator (or the width in the case of their strip counterparts) is one way to increase the impedance bandwidth. Using loading with resistive, inductive, and capacitive components is another way to improve the bandwidth (although it may add loss to the antenna). In this paper,...
It has been demonstrated that metamaterial-inspired electrically small antennas (ESAs) can be designed to have high radiation efficiencies and even large bandwidths with non-Foster circuit augmentations. However, being electrically small, it still remains a challenge to obtain directivities over interesting bandwidths which exceed those of simple dipoles, especially with only passive constructs. Different...
A super J-pole antenna with two fractal Koch curve shaped elements is proposed in this paper. In order to increase the bandwidth and to provide the proper phasing of the currents in the antenna elements a duplexer type phasing section is designed. The antenna performances (radiation patterns, VSWR and gain) are simulated and optimized for GSM-1800, UMTS-2100 and Wi-Fi 2,4 GHz bands. Fractal J-pole...
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