The tunable parasitic element excited by coaxial feeding shows dual. In this paper, these design concepts have been classified into three basic approaches. The tunable patch antenna configurations are becoming popular and attractive in many aspects. Nov 16, 2017 optically tunable microwave antennas for 5g applications by university of bristol simulated surface currents on a slotted microstrip patch with illumination of a silicon superstrate. Microstrip antenna on tunable substrate, proceedings of spie. The prospect of tunable graphenebased nano antenna for wireless communication is discussed. However mems technology suffers from high fabrication costs and reliability issues.
Microstrip antenna on tunable substrate, proceedings of. A reconfigurable microstrip cross parasitic antenna with. Langley a microstrip patch antenna operating in the 5 ghz range and tuned by liquid crystal lc is described. We can observe in this normalized model that the focus of the main beam is perpendicular to the plane of antenna, which should be aligned with the axis of the array for best results. The antenna can be tuned 300 mhz over the frequency range of 15. Gain enhancement of ferromagnetic composite tunable antenna a. Microstrip patch antennas were printed on the tunable substrate and radiation performance was studied for different bias conditions and frequency tuning has been demonstrated.
Procedures of designing the proposed reconfigurable dual bandnotched uwb antenna are shown in figure 1. In antenna spec, for example, the radiation efficiency is one of the most important requirements, but the radiation in the tunable matching networks and in the tunable filters is an undesired loss. B single patch antenna, c 2x2 5 ghz array connected with hard shorts, d 2x2 5 ghz array connect with rf shorts 3pf capacitors, and e ansys hfss simulated reflection coefficients for all four structures. The patch antenna is a directional antenna whose typical field pattern is illustrated in fig. A squareshaped patch antenna is considered with the width of w 320nm and the period of p 500nm.
Frequency tunable differentially fed inverted microstrip patch antenna with low crosspolarized radiation. The first attempt to analyze the radiation behavior of the hshaped microstrip antenna hmsa was carried out using the generalized cavity model to obtain the. The patch antenna radiation pattern is confined from zero to 180. Radiofrequency rf microelectromechanicalsystem mems switches are added in the gap of the proposed. In order to provide a dynamic response, reconfigurable antennas integrate an inner mechanism such as rf switches, varactors, mechanical actuators or tunable materials that enable the. A microstrip patch antenna is an attractive candidate to provide reconfigurability with low profile, light weight, conformability, and easy fabrication properties 2. The standoff layer consists of a 26nmthick ito layer and a 12nmthick alumina e al o. Tunable and electronically steerable microstrip antenna. This was mainly due to the advent of ferrite thin film technology and tunable substrate materials. Subsequently, the whole antenna structure at either switch on or off stage is analyzed using a fullwave simulation. A tunable microstrip patch antenna with switchable. Optically tunable microwave antennas for 5g applications by university of bristol simulated surface currents on a slotted microstrip patch with illumination of a silicon superstrate. The patch antenna is a good place to start for antenna fundamentals with more coming.
Frequency reconfigurable microstrip patchslot antenna. Radiofrequency rf microelectromechanicalsystem mems switches are added in the gap of the proposed srr to achieve frequency and radiation tuning in the performance of the microstrip patch antenna. The prospect of tunable graphenebased nanoantenna for wireless communication is discussed. In 18, a beamwidth tunable patch antenna was presented by adding two sizetunable parasitic patches to the left and right of a probefed patch along. Each probe excites one of the two fundamental modes of the antenna which are linearly polarized and orthogonal to each other. A millimeterwave inflatable frequencyagile elastomeric antenna. Tunable hshaped microstrip antenna with dual feeding hindawi. Proceedings of a meeting held 26 june 1 july 2016, fajardo, puerto rico, usa. A tunable microstrip patch antenna with switchable polarization.
Electronically tunable magnetic patch antennas with metal. Pdf logperiodic patch antenna with tunable frequency. Optically tunable microwave antennas for 5g applications. The magnetic patch antennas showed an enhanced bandwidth of 50% over the nonmagnetic patch antennas, a signi. A novel tunable microstrip patch antenna using liquid crystal. As new type of electronically tunable magnetic patch antennas with metal magnetic. Focus on tunable antennas add impedance elements to electrically change the. A fluidically tunable, dualband patch antenna with closely. A dc bias voltage is combined with the excitation signal to regulate the capacitance of a varactor diode mounted in the antenna structure. Tunable patch antenna using semiconductor and nanoscale. The microstrip antenna s radiation arises from the fringing fields, which are due to the advantageous voltage distribution. The simulated tuning range is 8% while the measurements showed a range of 4%. Tunable srrbased substrate for a microstrip patch antenna. Index terms3d printing, dualband antennas, patch an tennas, reconfigurable antennas.
In order to satisfy the requirements for the advanced systems used in modern wireless and radar applications, different multiband and reconfigurable antennas have been proposed and investigated in the past years. Two radiation nulls are realized at both band edges of the antenna efficiency curve, leading to a sharp band skirt and good selectivity in the. It is observed that for 1 and 2 mm spacing, the antenna radiates with an increased scanned angle, but the overall impedance bandwidth is minimal. In the development of magnetic tuning of microstrip patch on ferrite substrate is presented by rainville and. In this paper, these design concepts have been classified into. Differential probe fed liquid crystalbased frequency. To achieve tunable resonant frequency, bandwidth and radiation pattern, the antenna is further loaded with coplanar waveguide cpw on which microelectromechanical system mems. In the development of magnetic tuning of microstrip patch on ferrite substrate is presented by. In this case, it is necessary to first look at the fundamentals of the. Fabryperot model of the plasmon polariton interaction with graphenebased antenna is introduced. Reconfigurable microstrip antenna with tunable radiation.
The microstrip patch antenna is supported by a pdms. In this paper, the design and characterization of a tunable patch antenna loaded with complementary split ring resonators csrrs on the patch have been realized. Pattern controlled and frequency tunable microstrip. A novel frequencytunable antenna with a wide tuning range. A tunable, or active, antenna with improved efficiency needs less transmission power from the phones amplifier and saves battery life, shamblin says. A tunable patch using rf mems technology has been described 4. In 18, a beamwidth tunable patch antenna was presented by adding two size tunable parasitic patches to the left and right of a probefed patch along its hplane. Fundamental specifications of patch antennas radiation pattern a patch antenna radiates power in certain directions and we say that the antenna has directivity usually expressed in dbi. A differential probefed liquid crystal lcbased frequency tunable circularring patch antenna is presented.
A tunable antenna our group has worked on is a pixelated dualband folded monopole 6. The integration of monolithic microwave circuits and antennas are becoming easy today. Tunable reduced size planar folded slot antenna utilizing. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Oct 24, 2018 the spacing between the driven and tunable parasitic elements is an important factor, which affects the impedance matching and radiation characteristics of the antenna. Pdf study of electronically tunable circular patch antenna.
The design of a frequency reconfigurable dualband hshaped microstrip antenna fed by two coaxial probes is presented. Frequency tunable differentially fed inverted microstrip patch. Recent developments in reconfigurable and multiband. This communication demonstrates a method to design filtering antennas by using the filteringradiating patch frp. According to the cavity model, the permittivity and loss tangent of the lc are extracted from the measured differential reflection coefficients. If the antenna had a 100% radiation efficiency, all directivity would be converted to gain. The metamaterial component is composed of a threering square split ring resonator srr loaded in the antenna s substrate. In order to produce directional radiation pattern at all frequency bands, a reflector is installed at the back of the frequency reconfigurable slotpatch antenna 23.
Frequency tunable microstrip patch antenna using rf mems. Cb antenna length is a very critical factor that, to a great extent, determines the performance level of a cb antenna. A cpwfed circular wideslot uwb antenna with wide tunable. A microstrip antenna with a linearly polarized radiating patch is varied in resonant frequency by an electronic tuning technique. Typical half wave patches have efficiencies well above 90%. A reconfigurable antenna is an antenna capable of modifying its frequency and radiation properties dynamically, in a controlled and reversible manner. Highlights scattering of terahertz radiation on a graphenebased nanopatch antenna is numerically analyzed. Design of narrowband frequencytunable antenna abstract 2. A tunable coplanar patch antenna, a polymer mems based tunable bandpass filter, and a chipinpolymer packaging technology except where reference is made to the work of others, the work described in this thesis is my own or was done in collaboration with my advisory committee. The microstrip patch antenna produces three reconfigurable frequency bands while the slot produces another three frequency bands at the lower frequency region. Part of theamerican studies commons this thesis is brought to you for free and open access by the graduate school at scholar commons. Measurement of efficiency degradation due to external. The simulated result is well matched to the measured result. Aug 18, 2016 cb antenna length is a very critical factor that, to a great extent, determines the performance level of a cb antenna.
Us4475108a electronically tunable microstrip antenna. The patch antenna ebg structures and their radiation properties are characterized. Design and characterization of a tunable patch antenna loaded. Losses in the commercially available lc material at these frequencies give rise to antenna. Widely tunable multiband reconfigurable patch antenna for wireless applications h. Pattern controlled and frequency tunable microstrip antenna. The antenna consists of four suppatches connected to one feed line, each sub patch generates a single band. We propose a reconfigurable design of a metamaterialinspired microstrip patch antenna, capable of tuning the frequency spectrum and beam radiation. Widely tunable multiband reconfigurable patch antenna for. Recent developments in reconfigurable and multiband antenna. By placing a variable capacitor at the input of the subpatches, the impedance matching frequency of the antenna can be tuned over a wide range starting from 0. Uk 2wireless communication technologies, national physical laboratory. Tunable hshaped microstrip antenna with dual feeding.
Graphenebased nanopatch antenna for terahertz radiation. The antenna provides at 10 db return loss, a bandwidth of 10. Keywords logperiodic, microstrip antenna, reconfigurable. This antenna is comprised of a circular ring radiating element, a circular slot etched in the cpw ground plane, and a cpw ground plane together with the 50. Uda principle 3 and tunable parasitic patch size method presented in ref. The basics of patch antennas, updated orban microwave.
Ansoft hfss is used for both microstrip line and antenna analysis. Even with readily available commercial varactors, approximately 30 degrees oftunability is achieved. Proceedings of the ieee international symposium on antennas and. A planar crosstypeparasitic patch array antenna has been successfully demonstrated to give tunable radiation patterns. Design of filteringradiating patch antennas with tunable.
Tunable microstrip patch antenna and control system therefor ep1014487a1 en 19981223. In this paper, we propose a novel reconfigurable microstrip patch antenna having frequency and. The operating frequency of the antenna is found to be changed by varying the applied dc voltage. Highlights scattering of terahertz radiation on a graphenebased nano patch antenna is numerically analyzed. Tunable patch antenna using semiconductor and nanoscale barium strontium titanate varactors samuel andrew baylis university of south florida follow this and additional works at. Generally it is believed that the longer a cb antenna is, the better it would perform. The tunable in frequency, bandwidth, and radiation pattern is achieved by loading the antenna cpw on which rfmems capacitive switches are placed. Microstrip patch antenna design santa clara university.
The patch antenna is designed as a halfwavelength resonator of an ebg loaded microstrip transmission line. The proposed reconfigurable cross parasitic antenna works according to microstrip yagi. Patch antenna and method for tuning a patch antenna us6198438b1 en 19991004. A comparative analysis of various reconfigurable and multiband antenna concepts is presented. The antenna is symmetrically loaded with four varactor diodes to simultaneously tune these two modes. A planar parasitic array antenna for tunable radiation pattern. At the same time, the shape of the h radiation pattern is nearly omnidirectional at those chosen frequency points. This thesis does not include proprietary or classified information. A tunable patch that utilizes lc substrates for tuning capability has been reported 5. Besides, cavity model is extended to analyze the lcbased antenna for the differential operation. Design and characterization of a tunable patch antenna loaded with. The novel tunable microstrip patch antenna structure fully explores the advantages of the stacked patches, di.
The united states of america as represented by the secretary of the air force. Design and characterization of a tunable patch antenna. Evaluating the robustness of tunable adaptive antenna arrays. The patch antenna is therefore a voltage radiator, as opposed to the wire antennas, which radiate because the currents add up in phase and are therefore.
The standoff layer consists of a 26nmthick ito layer and a 12nmthick alumina e al o 3 23 which is placed between an optically thick gold substrate back mirror and an upper gold patch. Patch antenna is designed as a halfwave length microstrip resonator. Abstracta tunable metamaterial in integrated circuit structures is investigated through an example of a microstrip patch antenna on a mushroomtype electromagnetic bandgap ebg structure. The metamaterial component is composed of a threering square split ring resonator srr loaded in the antennas substrate. The antenna 50 includes a patch 51 with three equallyspaced tuning bars or strips 52, 54, 56 and 58, 60 and 62 on opposite sides 64 and 66 of the patch 51 the resonant frequency of the antenna 50 is inversely proportional to the total effective patch length, that is the length of the patch 51 plus any of the strips 52 through 62 connected thereto. The patch antenna is designed as a halfwavelength resonator of an ebg loaded microstrip transmission. Generally, the patch width is limited because of the undesirable in. In this case, it is necessary to first look at the fundamentals of the small tunable antennas in this chapter. Tunable two dimensional optical beam steering with. Antennas research electromagnetics research group emrg. In one embodiment the varactor is in shunt with a half wave open circuited radiator and adds electrical length to the. First, a uwb antenna without tsir and plsr is illustrated in figure 1a and is denoted as antenna1. Chapter 4 gain enhancement of tunable ferromagnetic anten. If different varactors were used with an increased capacitance.
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