Superstrate Layer Patch Antenna Research Papers (original) (raw)

Thin tubes can trap the electromagnetic (EM) energy, emitted wirelessly from a near-field source. The optimal dimensions of these hollow cylinders are determined for an extensive range of complex permittivities characterizing their material and the reported power enhancement is found practically independent of the antenna location. The spatial distribution of the signal reveals the reshaping in the paths of incoming rays and unveils the nature of the developed resonances in the vicinity of the photonic tubes, for both wave polarizations. The concept is experimentally demonstrated at the UHF band with the use of dense dielectric claddings; enhancement up to two orders of magnitude is recorded. The presented results constitute limits in terms of the EM energy accumulation for a simple configuration and, thus, can be utilized in various wireless power transfer (WPT) applications.

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- Wireless Power Transmission, Wireless Power Transfer

A microstrip patch antenna over which a 6 layer of metamaterial superstrate with the negative refractive index is proposed for the enhancement of gain over the conventional patch antenna The negative refractive index (NRI) property of superstrate covers the frequency range from 774 MHz to 974 MHz. The superstrate is placed 55 mm above the microstrip patch antenna. The function of the properties of negative refractive index is to gather the EM wave radiated from the antenna and the free space toward the normal direction of the antenna. An electromagnetic simulation software CST is used to study the characteristics of this metamaterial and the designe for the proposed antenna. The simulated result indicates that the gain of the proposed antenna is increased by 87.6% (2.32dB), in the desired frequency band 935 MHz to 960 MHz is also increased. Therefore, the gain of the antenna is effectively enhanced based on the negative refractive index metamaterial.

- by Kwong Chiew-Foong
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- Engineering, Materials Science, Optics, Microstrip Antenna

The advancement in the field of micro-strip patch antennas has made great progress in recent years. Compared with conventional antennas, it has more advantages and better prospects. These are lighter in weight, low volume, low cost, low profile, smaller in dimension and ease of fabrication and conformity. Moreover, the micro-strip patch antennas can provide dual and circular polarizations, dual-frequency operation, frequency agility, broad band-width, feed-line flexibility, beam scanning Omni-directional patterning. Metamaterials can be defined as artificial electromagnetic structures based on the assemblies of multiple elements fashioned from composite materials such as metals or plastics and it is basically an infinitely long metal rod at sub wavelength scale, which have the negative permittivity and the negative permeability simultaneously in a specific frequency range. However it enhances the performances of the antenna. A rectangular micro-strip patch antenna along with the met...

- by Saswata Sundar Laga
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Carbon nanomaterials have attracted significant consideration and concern due to the unique chemical and physical properties. Recently, nanodiamonds, graphene, and carbon nanotubes are served as electrodes, hydrogen storage elements, and composite materials. In this work, a 5 GHz graphene nanoantenna that falls inside the very-small-aperture terminal (VSAT) C-band range has been fabricated. A graphene substrate with a thickness of h = 0.5 cm is formed which is then used for fabricating a graphene nanoantenna working at 5 GHz. To design and simulate the antenna, Analysis System (ANSYS) electromagnetic desktop software was used. Using the designed graphene antenna, the parameters such as voltage standing wave ratio, three-dimensional radiation pattern, and directivity were obtained. After designing of the antenna using ANSYS software, it was physically fabricated. The graphene was used as a dielectric, copper sheet acted as a patch over as well as ground. Finally, the design was teste...

- by kasthuri nehru
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- Materials Science, Graphene, Carbon Nanotube, Materials Science and Engineering

The paper presents the parametric study of profiled corrugated horn. Variable Depth-slot-mode converter sections are used to convert dominant mode, TE 11 in to hybrid HE 11 mode to achieve wider bandwidth. is shown that a mode converter consisting of only five slots achieves a return loss better than 30 dB over the band 2.7 <ka< 3.8 (where a is the internal radius of the waveguide) with the HE11 mode in the balanced condition at ka = 2.9.

- by vishal kharadi
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- Materials Science

In this paper we describe the simulation of a rectangular microstrip patch antenna with transmission line feed. Also it is our target to improve the bandwidth of our designed antenna. The use of lower value of dielectric constant with moderate thickness it has possible to obtain a larger bandwidth. We have use the copper material both in ground and patch hence it reduces the cost of our designed antenna. The designed antenna is simulated using ANSYS High frequency structural simulator 13.0 (HFSS) software. The resonance frequency of our designed antenna is 3 GHz and the bandwidth of the antenna is 415 MHz which is 20 percent higher than usual antenna bandwidth and is applicable for practical application such as RADAR and Satellite stations. Here we have also represents the design procedure, feed mechanism and simulation results of different antenna parameters. Keywords—Transmission line feed; return loss; bandwidth; single layer substrate; Single band antenna; HFSS.

- by Dobir Hossain
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- Microstrip Patch Antenna

- by K. M. Abdus Sobahan
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- Microstrip Patch Antenna

A rectangular loop antenna is proposed for monitoring of cardiac activity based on the concept of surface impedance at 433MHz. Relied on a parametric study and an adequate impedance matching, an optimal dimensional choice is made. The antenna is placed in the vicinity of the human thorax, which is considered to be a multi-layer structure: skin, fat and muscle. Each layer is similar to a characteristic impedance line. The lowest layer (muscle) is considered as a layer of variable thickness. Its impedance changes with progress to the surface. Then, a comparison with another model of the thorax is made.

- by hamadi ghariani
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The advancement of wireless communication necessitates the design of high gain antennas with maximum possible miniaturization for developing compact systems. However, miniaturization leads to poor gain of the antenna. Thus, for effective communication it is important to enhance the gain of the antenna. In this paper the gain enhancement of a rectangular slot microstrip patch antenna with a metamaterial superstrate structure is proposed. High-gain planar antennas are drawing more and more attention because they have a low profile and can be easily fabricated by printed circuit board (PCB) technology. In addition, they are lighter than reflector antennas and are thus much easier to be installed. They have found applications in various domains such as satellite communications and wireless broadcasting. Electromagnetic metamaterials, possessing unusual properties, can be used to improve antennas performance. Among different kinds of metamaterials, the zero index metamaterials (ZIM) have...

- by SHAMEER K MOHAMMED
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this paper presents a miniaturized open-ended rectangular waveguide antenna radiating below the cutoff frequency of the waveguide with a large bandwidth. Waveguide miniaturization is achieved by periodically loading the antenna with electromagnetic metamaterials consisting of infinity shaped resonators. The metamaterial cell is designed to have a high effective dielectric permittivity in the frequency region below the cutoff frequency of the waveguide. HFSS software was used to obtain the transmission characteristics of the structure, which are then used to retrieve the effective material properties. Furthermore, the effective dielectric permittivity of the metamaterial cell exhibited a resonance around 5.2GHz. The waveguide antenna was designed and simulated using HFSS TM software. Comparing previous work of miniaturization of waveguides, a higher miniaturization ratio with a bandwidth about 1GHz and good matching is obtained.

- by Mohamed Ouda
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- Permittivity

Metamaterial is the arrangement of "artificial" elements in a periodic manner providing unusual electromagnetic properties. This unusual property has made it an area of interest for last few decades. It has wide applications in antennas. Gain, directivity, bandwidth, efficiency, and many other parameters of microstrip patch antenna can be improved using metamaterials. In this review paper, we first overview the metamaterials, its types and then the application of metamaterials in Microstrip patch antennas over the last 13-15 years.

- by Preet Kaur
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- Materials Science, Hybrid information technology

In wireless communication, antenna miniaturization is a vital issue these days. This paper presents the simulation analysis of small planar antennas using different antenna miniaturization techniques. They have brought to define miniaturization methods by which we can estimate the use of micro strip antennas. Various govt. and private sector organizations made use of these techniques to solve the problem of antenna fabrication in mobiles, satellites, missiles, radar navigational aids and military applications. These techniques are used to reduce the physical size but to increase the bandwidth and efficiency of antenna. Some approaches for antenna miniaturization are introduction of slots, slits, short meandering and novel geometries like fractals or by using higher dielectrics constant. The effect of miniaturization in various antenna parameters like, radiation efficiency, gain and bandwidth are discussed. Finally the paper reports a brief description of miniaturization of antenna b...

Abstract:- This paper discusses the advantages of using either asymmetric feed over symmetric feed. We report a first-of-its-kind realization of directional transmission for smartphone-like mobile devices using multiple passive directional antennas, supported by only one RF chain. Patch was designed on Triolein dielectric substrate material with dielectric constant 3.2 and frequency range is 10-15 GHz. The simulation has been performed by using FEM based HFSS software to compute performance of microstrip patch antenna. By varying the values of coupling, the results obtained show the effects of dielectric constant on directivity and gain of microstrip antennas.

- by Anupma Marwaha
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- Finite Element, HFSS, Circular Patch

In this paper, the main purpose is to design an Sband patch antenna which is basically directional and circularly polarized for S-band small satellites applications. This antenna has a square shape ground and on the upper portion there is a patch which is also square but with a single truncated corner in order to get circular polarization, the connection between the patch and the ground has been established using a coaxial probe. The designed antenna can be easily integrated with a small satellite body due to the simplicity of the design. Commercially available finite element method solver based High Frequency Structural Simulator (HFSS) have been used in this analysis. The proposed antenna achieved desirable results with an axial ration of 0.17dB at center frequency of 2.2 GHz and less than 3dB for a frequency band of 31 MHz and beam width of more than 110°. The gain achieved by this antenna is around 7dBi at center frequency. The directional radiation pattern, circular polarizatio...

- by Ali MEBREK
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- Physics

A printed multiband inverted-F antenna (IFA) is presented in this letter. The concept of loading a printed-IFA with composite right/left-handed (CRLH) unit cells is theoretically and analyze investigated by using electromagnetic simulators, High Frequency Structure Simulator (HFSS), for wireless communication. The proposed printed-IFA with two arms interconnect by CRLH unit cell to achieve extra operating bands in addition to the two fundamental resonant frequencies of two IFA arms. The structure is designed to operate at GSM 1.8 GHz and WLAN 5.2 GHz. simulated results are in good agreement with the theoretical predictions. KeywordsAntennas IFA,Transmission ligne metamaterial, CRLH, wireless communication.

- by Amal Abdelkrim
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Dual frequency microstrip patch antennas is important when two operating frequencies are far apart to avoid the use of separate antenna. In addition, dual frequency microstrip patch antennas also can provide large bandwidth in application in which large bandwidth is really need when operating at two separate transmit-receive bands. In this paper, the design, simulation, fabrication and measurement of dual frequency microstrip square patch antenna is presented.

- by Sohiful Anuar Zainol Murad
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An increasing number of practical applications of three-dimensional microwave imaging require accurate and efficient inversion techniques. In this context, a full-wave 3D inverse-scattering method, aimed at characterizing dielectric targets, is described in this paper. In particular, the inversion approach has a Newton-based structure, in which the internal linear solver is a conjugate gradient-like algorithm in lp spaces. The presented results, which include the inversion of both numerical and experimental scattered-field data obtained in the presence of homogeneous and inhomogeneous targets, validate the reconstruction capabilities of the proposed technique.

The addition of a dielectric layer on a slab configuration is frequently utilized in various electromagnetic devices in order to give them certain desired operational characteristics. In this work, we consider a grounded dielectric film-slab, which is externally excited by a normally-incident Gaussian beam. On top of the film-slab, we use an additional suitably selected single isotropic superstrate layer in order to increase the field concentration inside the slab and hence achieve optimal power transfer from the external source to the internal region. We define a quantity of interest, called “enhancement factor,” expressing the increase of the field concentration in the film-slab when the superstrate is present compared to the case that it is absent. It is shown that large enhancement factor values may be achieved by choosing properly the permittivity, the permeability, and the thickness of the superstrate. In particular, it is demonstrated that the field in the film-slab is signif...

- by IJERT Journal
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- Engineering

The addition of a dielectric layer on a slab configuration is frequently utilized in various electromagnetic devices in order to give them certain desired operational characteristics. In this work, we consider a grounded dielectric film-slab, which is externally excited by a normally-incident Gaussian beam. On top of the film-slab, we use an additional suitably selected single isotropic superstrate layer in order to increase the field concentration inside the slab and hence achieve optimal power transfer from the external source to the internal region. We define a quantity of interest, called "enhancement factor," expressing the increase of the field concentration in the film-slab when the superstrate is present compared to the case that it is absent. It is shown that large enhancement factor values may be achieved by choosing properly the permittivity, the permeability, and the thickness of the superstrate. In particular, it is demonstrated that the field in the film-slab is significantly enhanced when the slab is composed by an -near-zero (ENZ) or low-index metamaterial.

- by Constantinos Valagiannopoulos and +1
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- Concentrated Solar Power, Field Enhancement, Superstrate Layer Patch Antenna

— This paper presents the effects of superstrate & designed to enhance the performance parameters of rectangular microstrip patch antennas. The modified split ring resonator (MSRR) is used in design. At frequency 2.2 GHz, the microstrip patch antenna is designed with the help of superstrate. Metamaterial superstrate is a significant method to obtain high directivity of one or a few antennas. In this paper, the characteristics of directivity enhancement using metamaterial structures as antenna superstrates that is artificial magnetic superstrate. This design helps to enhance gain and efficiency of microstrip patch antenna at resonance frequency. The simulated and observative results through HFSS, 10 db impedance bandwidth of rectangular microstrip patch antenna is at 2.2 GHz, The radiation efficiency, gain and directivity of proposed antenna are presented at 2.2 GHz. The coding has been done by MATLAB and simulation results has been done by HFSS.

Considered is the scattering and absorption of an E-polarized two-dimensional (2D) beam generated by a complex-source-point (CSP) feed in the presence of a lossy grounded dielectric slab with a lossless superstrate. The solution is found analytically in the Fourier-transform domain. Numerical results demonstrate the ways of obtaining enhanced absorption in the slab by a proper selection of the slab electrical thickness and the parameters of the superstrate. The effects of internal resonances in the slab are analyzed and discussed.

- by Constantinos Valagiannopoulos and +1
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- Wireless Communications, Power Electronics, Concentration, Dipole

In this paper a K-band transmitting horn antenna is designed for the harbour surveillance radar application. To increase the coverage area of the FMCW radar, one of the key factor is the transceiver system. Transceiver system includes the transmitting and the receiving antenna. The antenna is of great importance in a radar system. In the previous works the antenna such as switched antenna, planar differential antenna, azimuth 60º are used. To reach long distance we are in need of antennas having high gain and high directivity antenna. The highly directional antennas are horn antenna and dish antenna. Hence in this paper a horn antenna is chosen and it is designed at the operating frequency of 24GHz (i.e. K band). Thus we are going to increase the gain of the FMCW radar and also the range of coverage area. The design and simulation are carried out in the Ansoft HFSS software. The antenna parameters such as gain, directivity and the radiated energy are obtained for the designed horn antenna. Also in this paper these parameters are compared with the horn antenna operating in X-band and Ku-band. The performance of the system is improved by increasing the frequency range. The harbour surveillance is the main application focused in this paper.

- by Dr. N. Muthu kumaran
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- Antennas & Radio Wave Propagation

In this paper a compact tapered fed dual band monopole antenna based on complimentary split ring resonators(CSRR) used for WLAN and WiMAX application. Two CSRR are placed side by side symmetrically, which produces a narrow stop band in a single band for which dual band observed. As over all bandwidth reduces the gain is improved. The composite metamaterial CSRR can provide dual band operation at 1.9-2.6 and 2.92-4.3 GHz with reflection coefficient less than -10 dB by the two resonant modes due to CSRR and length of the patch. The gain at lower resonant band -2-0.2 dB and at higher resonant band 0.5-2 dB. A 50 Ω microstrip line, followed by parabolic feed and rectangle step feed is adopted for impedance matching. The uniqueness of this design is that the CSRR generates a narrow stop band in a wideband produced by an element without having any CSRR, which makes the dual band antenna very compact. Antenna parameters like reflection coefficient, radiation pattern, gain are analyzed with numerical simulation.

- by Sudhakar Sahu
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- Metamaterial

This paper describes the Transformation of Rectangular patch antenna into Circular patch Antenna for LAN use, operating at 5.4GHz frequency; using HFSS simulator. Return Loss Parameter was calculated and for rectangular it was 15.157db at... more

- by Dr Sandip Vijay
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— In wireless communication, antenna miniaturization is a vital issue these days. This paper presents the simulation analysis of small planar antennas using different antenna miniaturization techniques. They have brought to define miniaturization methods by which we can estimate the use of micro strip antennas. Various govt. and private sector organizations made use of these techniques to solve the problem of antenna fabrication in mobiles, satellites, missiles, radar navigational aids and military applications. These techniques are used to reduce the physical size but to increase the bandwidth and efficiency of antenna. Some approaches for antenna miniaturization are introduction of slots, slits, short meandering and novel geometries like fractals or by using higher dielectrics constant. The effect of miniaturization in various antenna parameters like, radiation efficiency, gain and bandwidth are discussed. Finally the paper reports a brief description of miniaturization of antenna by using suitable and efficient methods that includes use of double layered substrate structure in microstrip patch antenna. Index Terms—micro strip patch antenna, antenna miniaturization, dielectric constant, double substrates

- by prudhvi raj
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- Microstrip antenna design

The propagation characteristics of the fundamental mode of annular ring microstrip antenna (ARMSA) on metamaterial substrate are determined via spectral domain analysis. Green's functions of the structure in Hankel transform domain are determined by using Hertz vector formulation. Numerical results of resonant frequencies and return losses are found as functions of the metamaterial properties and some geometrical parameters.

- by Sandro da Silva
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- Engineering, Microstrip Antenna, Domain Analysis, Physical sciences