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This Work Presents the design of two different antenna. First, a Microstrip patch antenna with different shapes of cut in slot is designed. In order to increase the bandwidth and to obtain Dual polarization power divider having 50, 70 and 100 Ohm transmission line is fed in vertical and horizontal direction to the designed antenna. Second, a Serpinski Gasket antenna is designed for a working bandwidth...
A multi-band Quasi-Yagi antenna based on loop excitation is presented with 68% miniaturization, which is achieved using loop meandering and a novel defected ground structure (DGS), targeting the 2 GHz band. It has a minimum measured −6 dB bandwidth of 249 MHz (0.780–1.029 GHz) in the lower band and 286 MHz (1.932–2.218 GHz) in the upper band covering several LTE bands. The proposed antenna ensures...
We present a low profile, wideband beam-steering antenna for continuous coverage of the K- and Ka-bands (18–40GHz). The array is based on the tightly coupled dipole principle and micro-electro mechanical systems (MEMS) phase shifters are integrated into each element for real-time beam forming. This topology leads to significant reduction in the size, weight, complexity, and cost of the phased array...
Three antennas including a printed dipole, a meander antenna and a loop meander antenna operating at 2.46 GHz are presented. They are simulated, fabricated and measured. The results show that the design of meaner antenna and meander loop antenna do expand the bandwidth without increasing the antenna size.
A novel compact dual-polarized unidirectional wideband antenna based on two crossed magneto-electric dipoles is proposed. The proposed miniaturization method consist in transforming the electrical filled square dipoles into vertical folded square loops. The surface of the radiating element is reduced to 0.23λ0∗0.23λ0, where λ0 is the wavelength at the lowest operation frequency for a standing wave...
This paper presents a planar, broadband, electrically-small, circularly polarized (CP), near field resonant parasitic (NFRP) antenna fed by a crossed dipole driver. The driven and parasitic elements are printed on two separate thin substrates, which are stacked together with no air-gap to achieve the compact planar configuration. The technique of introducing meander lines and arrowhead-shaped endings...
A broadband dual-polarized dual-dipole (DPDD) planar antenna is analyzed and designed for 2G/3G/4G base stations. The DPDD antenna consists of two perpendicularly crossed dual-dipole elements. Each dual-dipole element is comprised of two identical side-by-side dipoles which are connected through a coplanar strip line that also acts as an impedance transformer. Two dual-dipole elements are printed...
By augmenting several classes of metamaterial-inspired near-field resonant parasitic (NFRP) electrically small antennas (ESAs) with active (non-Foster) circuits, we have achieved performance characteristics surpassing their fundamental passive bounds. The designs not only have high radiation efficiencies, but they also exhibit large frequency bandwidths, large beam widths, large front-to-back ratios,...
The non-Foster impedance circuits enhance the bandwidth performance of small antennas. This paper explores various conventional and novel techniques to realise non-Foster impedance and conclude their advantages as well as limitations. These design techniques includes conventional operational amplifiers (op-amps) and bipolar junction transistors (BJTs) and non-conventional graphene field-effect transistors...
Fundamental impedance matching bounds for electrically small loop antennas are derived based on spherical wave scattering in the low-frequency limit. A small lossless loop antenna is represented as a two-port network between the excitation port and the fundamental TE spherical wave port. The low-frequency asymptotic expression for the wave reflection coefficient is found and the classical Fano approach...
It is demonstrated by means of RLC circuit models of electrically small antennas that their isolated-resonance quality factors obtained from the “Q-energy” predicts their bandwidths with greater accuracy than the “equivalent-circuit” or the “elec-trodynamic” energies. Moreover, it is verified that the Q-energy cannot be considered stored energy in highly dispersive lossy material. Nonetheless, using...
The capability of an Autonomous Underwater Vehicle (AUV) or Remote Operated Vehicles (ROVs) to communicate with underwater sensor nodes or a docking station, for the exchange or transfer of data gathered during a survey mission, requires an high-speed short-range communication link. This is important because of the global attention to the underwater communication applications. To this end, underwater...
Two-element ultra-wideband (UWB) multiple input and multiple output (MIMO) antennas are presented to obtain high isolation. The designed UWB-MIMO antennas are composed of two identical orthogonal antenna elements, and a defected ground structure with I-shaped slot and a pair of L-shaped stub are employed to get better isolation. Bandwidth of the proposed antennas range from 3.28 GHz-12 GHz. Also,...
The SKA1-LOW radio telescope will be a low-frequency (50–350 MHz) aperture array composed by ∼130,000 antenna elements spread over tens of kilometers and located in Western Australia. Its scientific objectives will prioritize studies of the Epoch of Reionization and pulsar physics. This paper will focus on the key performance parameters and constraints driving the architectural design of the World's...
We present a novel tightly coupled dipole array (TCDA) that achieves 67:1 bandwidth over the 30 MHz to 2 GHz frequency range. The design is extremely simple, and consists of 3 overlapping dipoles that are fed at 3 different locations to ensure uniform current flow. The overlapping dipoles are “printed” on a 0.3 mm-thick polymer substrate (εr=3), and “sandwiched” between two layers of flexible polymer...
Retrodirective antennas used for radiative wireless power transfer (WPT) are typically resonant and exhibit strong backscatter, a limited field of view and small bandwidth. These limitations are here overcome by using an array of long slots fed by parallel plate waveguides (PPWs). It is shown that the array can collect the total power impinging from a remote source over a large field of view and bandwidth...
A new and circularly polarized (CP) antenna is proposed for global navigation satellite systems (GNSS) applications. The antenna employs a single feed and two orthogonally elliptical printed dipoles. The dipoles are crossed through a 90° phase delay line of a vacant-quarter printed ring to achieve CP radiation. In order to achieve broad beamwidth, four metallic cylinders are introduced. The proposed...
In this paper, two different designs of 3-element planar Yagi-Uda antenna based on the shape of driven and reflector elements are studied. To feed the driven element of Yagi-Uda antenna, a tapered microstrip balun is designed, which converts unbalanced coaxial feed to balanced microstrip line feed. Measured results of both the antennas are compared and it is shown that a planar Yagi-Uda antenna using...
Ultrawideband (UWB) systems have attracted great attention in recent years with their potential to support the large data bandwidths of modern media streams. To meet these needs, early UWB antenna designs have been rediscovered and improved upon, and a new generation of UWB antenna designs is emerging. This talk will present a historical introduction to UWB antennas. The importance of learning the...
In this paper the design of a high-gain planar antenna is presented. The antenna is designed to operate at 15GHz and has 24dB directivity. This design basically consists of four high-gain Yagi-Uda arrays, which are placed in parallel on a broad-side configuration and are excited uniformly through a feed network. The feed network and the antenna elements are all printed on the same substrate with the...
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