Ferraro outstanding research award joshua petko, electrical engineering ms graduate student april 2005. The proposed antenna exhibits frequency reconfigurability of 1. Experimental verification of metamaterial loaded small patch. Transmission lines loaded with electrically small resonators. A novel metamaterialinspired patch antenna is proposed, wherein a. Metamaterial antennas are a class of antennas which use metamaterials to increase performance of miniaturized electrically small. Losses and dispersion characteristics of the eng materials are. Rectangular microstrip patch antenna, metamaterials, bandwidth, return loss. We present a true metasurface antenna based on electrically small resonators. A fixed or switched series capacitance is used to overcome the inductance of the meander line.
Multiband, frequency reconfigurable, and metamaterial. Sep 16, 2016 liu q, hall ps, borja al 2009 efficiency of electrically small dipole antennas loaded with lefthanded transmission lines. Esa electrically small antenna ez epsilon zero fbw fractional bandwidth. This design is easy to fabricate, can reduce the patch size by about 35%, and broadens the bandwidth by 1. Established lithography techniques can be used to print metamaterial elements on a pc board. A foldedmonopole model for electrically small nritl metamaterial antennas. Smart materials such as ferrites and liquid crystals can also be used to achieve. Srrloaded metamaterialinspired electricallysmall monopole. Jp2014523163a electrically small vertical split ring. Introduction a microstrip patch antenna consists of a radiating patch on one side and ground. A twostep evolution leads to a compact size antenna. Improvement in parameters of patch antenna by using spiral. Sep 19, 2000 in general, the impedance of an electrically small antenna may be modeled by a simple parallel resonant circuit small loop antennas or by a simple series resonant circuit small dipole antennas.
Accordingly it is used to achieve significant bandwidth enhancement and analyze the matching and radiation properties of sub wavelength resonant patch antenna filled with doublenegative, double positive and single negative meta material block,quasi static equivalent circuit model for analysis and design of different types of artificial. Application of double negative materials to increase the power radiated by electrically small antennas, r. An electrically small antenna has a very reactive input impedance with an associated very narrow bandwidth 2. Metamaterials and their applications on ant enna gain enhancement author. A metamaterial antenna behaves as if it were much larger than its actual size, because its novel structure stores and reradiates energy. The remarkable resonance effect suggests that dng materials may offer a solution to antenna miniaturization.
The smaller the antenna the more faithfully the simple resonant circuit models replicate actual antenna behavior with respect to their inductance. The performance of the proposed antenna is compared with reported metamaterial antenna of comparable. Uwb metamaterialloaded antenna for cband applications. Institute of science and technology nist in boulder, co ziolkowski et al. In fact, the gain performances of such electrically small. S parameter of patch antenna loaded with mu negative metamaterial fig. However, if it is filled with an eng material, its permittivity is negative, and, hence, its capacitance is negative. The antenna is impedancematched by means of a quarterwavelength. Theoretical formulation for an electrically small microstrip patch antenna loaded with negative index materials.
Bandwidth enhancement and size reduction of microstrip. An electrically small metamaterial antenna is presented for ultra wide band applications. Novel design of a dual band microstrip circular patch antenna loaded with eng. Subwavelength elliptical patch antenna loaded with \mu. The electrically small, compact, planar tunable microstrip antenna operates at hf and vhf frequencies.
Metamaterials and their applications on antenna gain. Us6404391b1 meander line loaded tunable patch antenna. From metamaterialbased to metamaterialinspired miniaturized antennas. Performance improvement of micro strip patch antenna. Us6677901b1 planar tunable microstrip antenna for hf and. T compact circularlypolarized patch antenna loaded with metamaterial structures. A metamaterial paradigm for achieving an efficient, electrically small antenna is introduced. That formulation has allowed us deriving the necessary conditions in. Metamaterial loaded frequency tunable electrically small. Electrically small antennas loaded with metamaterials for.
Electrically small rectangular microstrip patch antenna. An efficient metamaterialinspired electricallysmall antenna. Gain improvement of microstrip patch antenna using. Spiral embedded electrically small reconfigurable antenna anju pradeep 1, s mridula 1 and p mohanan 2. We analyze the matching and radiation properties of subwavelength resonant patch antennas filled with doublenegative, doublepositive, andor singlenegative metamaterial blocks. Their purpose, as with any electromagnetic antenna, is to launch energy into free space. Electrically small patch antenna loaded with metamaterial.
A novel metamaterialinspired patch antenna is proposed, wherein a 2segment srr labyrinth metamaterial is embedded inside the antenna substrate. Metamaterialinspired engineering of electrically small. The resonators are placed on a flat surface and connected to one. A new double lshaped multiband patch antenna on a polymer resin material ubstrate. This paper presents an indigenous lowcost metamaterial embedded wearable rectangular microstrip patch antenna using polyester substrate for ieee 802. This is because it is difficult to attain an inductive input reactance and a suitable gain of an electrically small antenna. Subwavelength, compact, resonant patch antennas loaded with. An antenna system having at least one active element with a first end thereof for connection to a radio receiver, transmitter or transceiver and at least one electromechanical resonator connected in series with i at least portion of said at least one active element and at least another portion of said at least one active element or ii said at least one active element and said radio. A microstrip patch antenna using planar metamaterial unit cell is designed, simulated.
Transmissionline based metamaterials in antenna engineering. Nov 08, 20 findings electrically small circular patch antennas loaded with single layer metamaterials experimentally demonstrated to acceptable figures of merit for applications. In the presence of the dng shell, the dipole antenna exhibits three interesting characteristics. The proposed miniaturization technique is potentially promising for antenna applications and the results presented in the paper constitute a relevant proof for the usefulness. Owing to the high efficiency and compact size, the proposed antenna will find broad applications in the field of wireless communication. However, this class of antenna incorporates metamaterials, which are materials engineered with novel, often microscopic, structures to produce unusual physical. Sbir navy metamaterialbased electrically small antenna. At different bands on a single device, multiband microstrip patch antenna is. Ultimately, the primary design challenge is achieving as wide an. In this proposed antenna a high radiation efficiency of about 84. Is possible to make small hf microstrip or helical antenna. In 10, a simple single layer patch antenna with embedded meanderline eml loading is proposed. Raghavan, srrloaded metamaterialinspired electricallysmall.
Efficient design of electrically small antenna using. Kasabegoudar, slot loaded electrically small rectangular patch antenna for mimo applications, int. The antenna consists of some turns around a high permeability core. Request pdf metamaterial loaded frequency tunable electrically small planar patch antenna in this paper, we present a metamaterial loaded frequency tunable electrically small planar patch antenna.
Rectangular patch antenna using hexagonal rings structure. Circularly polarized antennas are complex structures in general because they are constituted by two or more antennas in multilayer structures or employ phaseshifting circuits. Undoubtedly, metamaterialinspired theoretical ideas can offer new points of view in the traditional small antenna design. Microstrip patch antenna miniaturization using planar metamaterial. A vertical split ring resonator antenna is disclosed that includes a substrate having an upper surface and a lower surface, an interdigital capacitor coupled to the upper surface of the substrate, and a ground coupled to the lower surface. The electrical dual of an antenna loaded with a high permittivity material is the loopstick antenna.
Further, the concept of intended phase shift between interfering waves is used to. Metamaterialbased efficient electrically small antennas request. This antenna is small size, cheap, compact and easy to fabricate, and achieve good radiation characteristics with higher return loss. The present invention features a compact tunable meander line loaded patch antenna where switches or the like are used to electrically connect and disconnect sections of the meander line adjusting the electrical length of the antenna. Subwavelength, compact, resonant patch antennas loaded with metamaterials. Novel electromagnetic metamaterials negative index metamaterials references 1 theoretical formulation for an electrically small microstrip patch antenna loaded with negative index materials by j. School of electronic engineering and computer science, queen mary, university of london, london e1 4ns, u.
Subwavelength, compact, resonant patch antennas loaded with metamaterials abstract we analyze the matching and radiation properties of subwavelength resonant patch antennas filled with doublenegative, doublepositive, andor singlenegative metamaterial blocks. For example, resonant conditions for strongly subwavelength patch antennas, or possibilities to overcome the small antenna q. Subwavelength, compact, resonant patch antennas loaded. The loading of metamaterial shows a radial size reduction of 56.
Electrically small uslot loaded circular microstrip patch. First, we formulate a general theory for inhomogeneously loaded subwavelength elliptical patch antennas. The input impedance shows potentials for wide bandwidth due. The simulated crosspolarization level is lower by 20dbi compared to copolarized. Metamaterialinspired monopole antennas are good alternatives to overcome. Electrically small rectangular patch antenna with slot for. It improves gain due to its negative refractive property. Planar metamaterials and many microwave circuits and antennas are designed by. In the present work, complementary split ring resonator is loaded in the ground plane of circular microstrip patch antenna is.
In this sort of metamaterial loaded patch antennas, the resonant frequency can be tuned according to designers will. The three regions indicate region of high loss, moderate loss and low. Electrically small metamaterial antenna of zeroth order resonance incorporating a spiral resonator embedded into an asymmetric coplanar stripline is reported. The proposed small antenna was designed and analyzed using a finiteelement methodbased, commercially available. In the present work, a metamaterialinspired antenna is. This antenna can have wide application in a great variety of wireless communication. Metamaterials and their applications on antenna gain enhancement. Loopstick antennas are common in portable am receivers. The second antenna, a loaded planar monopole antenna, was designed as compact as possible. Design and simulation of rectangular microstrip patch antenna loaded with metamaterial structure. Like the loopstick, or indeed any small antenna, as size goes down, so does operating bandwidth. Apparatus and method for broadband matching of electrically.
When designing a passive rfid tag, it is clear that the antenna is a major component of the overall size 6. The nicolsonrossweir nrw method has been used to retrieve the material parameters. A discussion on electrically small antennas loaded with high. Infinite wavelength devices electrically small antennas high directivity antennas compact multifrequency antennas compact multifunctional antennas dispersion engineering. The geometry of the proposed electrically small monopole antenna, which consists of a tshaped patch and a set of rectangular srr rings, is depicted in fig. Jung, a small wideband microstripfed monopole antenna, micro. The current distribution, input impedance, and radiation pattern of a cylindrical dipole antenna enclosed by a thin cylindrical shell of double negative dng metamaterial are computed using the piecewise sinusoidal galerkin formulation. Reduced size patch antenna using complementary split ring. Also, the radiation resistance of the small antenna is very small so it must carry a large current to radiate any signi cant power. Is possible to make small hf microstrip or helical antenna by. Antenna with a reactive impedance substrate for mine. But it has been shown that electrically small size patch antenna having metamaterial loading is not practicable without degradation of radiation performance 7, 8.
Time delay lines group velocity control antenna phase center control active elements low loss. For natural dps materials the limits of physics makes the resonance effect impossible when the structures are electrically small but for dng materials this is not the case. An electrically small antenna ensures easy integration with devices without. A new double lshaped multiband patch antenna on a polymer. Abstractin this work, a rectangular microstrip patch antenna loaded with rectangular patch antenna using array of hexagonal rings structure in lband metamaterial structure is designed at a height 3. Design and simulation of rectangular microstrip patch. Electrically small antennas lower frequencies metamaterialinspired constructs. As is wellknown, there are a number of techniques whereby an electrically small antenna can be efficiently matched to a 50. Analyses of a dipole antenna loaded by a cylindrical shell. Electrically small antenna design with manipulated radiation beam.
For example, resonant conditions for strongly subwavelength patch antennas, or possibilities to overcome the smallantenna q. The length of the patch is the half of the wavelength in metasubstrate. It is proven that, using small dipole and loop antennas loaded by certain simple electronic circuits as composite inclusions, the material behaves as an effective medium with real negative parameters in wide frequency bands. A discussion on electrically small antennas loaded with. Here, we show that this limitation can be relaxed in composite materials with active inclusions.
Using eng metamaterial instead of the conventional dielectric, unconventional tm. In the recent decade, the application of metamaterials in antennas has invoked increasing interest. Miniaturized patch antenna loaded with a munegative mng metamaterial substrate the figure is from. Frequency switching of electrically small patch antenna using. It is observed that upon incorporation, the bandwidth widens to around 600% and vswr improves by approx. Metamaterial enhances microstrip antenna gain microwaves. Electrically small metamaterialbased antennas have we seen. The modification of tm020 mode is reported by partially metamaterial loaded rectangular patch antenna 16. Conventional antennas that are very small compared to the wavelength reflect most of the signal back to the source. Novel dual band microstrip circular patch antennas loaded. The proposed design provides a tunable frequency band with maximum efficiency and a bandwidth of.
Miniaturization of an electrically small metamaterial inspired. Like the loopstick, an antenna loaded with a high permittivity material will have a reactive impedance, though it will be capacitive rather than inductive. Enhancement of electrically small antennas prop erties with. Since antenna integration and miniaturization are two major challenges in mimo systems, we propose a slot loaded electrically small rectangular patch antenna that operates in the 0. Miniaturized circular microstrip patch antenna partially loaded with. Ziolkowski, electrically small dualband and circularly polarized magneticallycoupled nearfield resonant parasitic wire antennas. Original metamaterialbased, efficient electrically small antenna consisting of a.
Electrically small antennas loaded with metamaterials for bodycentric wireless communications. The electrically small antenna is in free space and may be enclosed in a sphere of radius a. Spiral embedded electrically small reconfigurable antenna. Analyzing the theoretical limits inherently present when loading such common radiators with metamaterials, we show how these configurations may exhibit in principle an arbitrarily low resonant frequency for a fixed. Werner 2005 ieee antenna and propagation society international symposium, vol. Design of a compact patch antenna loading periodic.
Metamaterial antennas are a class of antennas which use metamaterials to increase performance of miniaturized electrically small antenna systems. A circular disc patch antenna resonating at dual band frequency with 2. Electrically small antennas have remained a significant topic of interest for a number of applications, particularly low frequency systems and wireless networks requiring small devices. Electrically small metamaterialbased antennas have we. Antenna design the patch of the antenna is designed as a simple square patch. Metamaterial embedded wearable rectangular microstrip. An electrically small planar tunable microstrip antenna is provided by stacking a radiating element, microstrip dielectric substrate and a ground plane, and coupling the ground plane to a means for tuning. Design of electrically small metamaterial antenna with elc. An electrically small antenna is designed by loading the patch with split. The simulated crosspolarization level is lower by 20dbi compared to co polarized. A circularly polarized spiralloop antenna and its simple. In 2005 a patch antenna with a metamaterial cover was proposed that enhanced directivity. Us20180198211a1 antenna loaded with electromechanical. Figure 5 gain for the simple rectangular patch antenna using hfss.
Undoubtedly, metamaterialinspired theoretical ideas can offer new points of view in the traditional smallantenna design. This core effectively multiplies the magnetic field by aligning its own magnetic domains with the magnetic field due to the current in the coil. Some application examples for this purpose are metamaterialbased efficient esas, 10 electrically small splitring resonator antennas, 11 and electrically small patch antenna loaded with. And like the loopstick, the properties of your antenna will be limited by the dielectric. The high front to back power ratio for both antennas makes them suitable as wearable antenna for mine rescue. In one embodiment, a quarter wavelength mode patch antenna can be. The unloaded circular microstrip patch antenna resonates at 6. Metamaterial embedded wearable rectangular microstrip patch.
The fundamental limitation lower bound on the quality factor q of an electrically small antenna that fully occupies a spherical volume is defined by the wellknown chu limit. A copolarization broadband radar absorber for rcs reduction. The strategy is to design a length of metamaterialloaded transmission line that can be. The antenna has a meanderline esa which is matched with an electrically small section of microstrip transmission line. The operation of such a radiative component has been predicted in alu et al. Frequency switching of electrically small patch antenna. A novel metamaterial structure has been proposed for its operation at 2. In this chapter, a simple spiralloop antenna radiating circular polarization is introduced. Electrically small resonators for planar metamaterial. The proposed antenna with uslot and csrr enhanced the matching upto37. The fundamentals of patch antenna design and performance. For this reason, the circularly polarized antennas are too complex to be applied to mobile communication devices such as.
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