The tunable patch antenna configurations are becoming popular and attractive in many aspects. Design and characterization of a tunable patch antenna. Many interesting approaches for the design of tunable antennas were presented. Thestructureconsistsofapatch antenna loaded with a coplanar waveguide cpw loading section attached to the antenna.
At the same time, the shape of the h radiation pattern is nearly omnidirectional at those chosen frequency points. Secondly, fixed radiation pattern antenna frpa, and controlled radiation pattern antenna crpa phased array configurations of miniaturized patch antennas are studied. In this paper, frequency reconfigurable slotpatch antenna with reflector at the back of. The reflection coefficient for both antennas are below 10 db. Telecommunication engineering, polytechnic university of catalonia, 20 b. Design of frequency and polarization tunable microstrip antenna. A microstrip patch antenna is an attractive candidate to provide reconfigurability with low profile, light weight, conformability, and easy fabrication properties 2. Tunable disk patch antenna ieee conference publication. Typical half wave patches have efficiencies well above 90%. The patch antenna is a directional antenna whose typical field pattern is illustrated in fig. Us5943016a tunable microstrip patch antenna and feed. Frequency reconfiguration is generally achieved by physical or electrical modifications to the antenna dimensions using rfswitches, impedance loading or tunable materials.
For antenna 20, which has a square patch that is a special case of a rectangular patch, the patch 24. A reconfigurable antenna is an antenna capable of modifying its frequency and radiation. 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. The tunable parasitic element excited by coaxial feeding shows dual. Performance enhanced miniaturized and electrically tunable. This article presents the design of a pattern switchable patch antenna for vehicular applications. This paper uses the vector network analyzer to test the s parameter of the fabricated antenna. This can be understood by visualizing the antenna 20 as a resonant cavity 30 formed by the ground plane 22 and the patch 24 with open side walls as shown in fig. The design of a frequency reconfigurable dualband hshaped microstrip antenna fed by two coaxial probes is presented. Frequency tunable printed antenna with 90% size reduction for. The measured radiation patterns of the antenna for capacitor. Radiation pattern reconfigurability is based on the intentional modification of the spherical distribution of the radiation pattern. Microstrip patch antennas or simply patch antenna are increasingly useful because the antenna is printed directly onto a circuit board. A gridslotted patch with two tunable varactors is placed on the top layer, a microstrip line is placed in the middle of two substrates.
The important feature of the tunable microstrip patch antenna presented here is that it is suitable for fabrication using proven printed circuit processing techniques such. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. Tunable patch antenna using semiconductor and nanoscale. These magnetic antenna show great promise for achieving selfbiased miniaturised patch antennas on magnetoelectric substrate with signi. We propose a reconfigurable design of a metamaterialinspired microstrip patch antenna, capable of tuning the frequency spectrum and beam radiation. The proposed pattern controlled and frequency tunable metamaterial antenna demonstrates efficient reconfigurable reflection coefficient, radiation pattern, and current density performance. Electrical engineering, polytechnic university of catalonia, 2014 a thesis submitted to the graduate faculty of the university of colorado colorado springs in partial ful. This paper presents a novel lowprofile high gain frequency reconfigurable patch antenna with unidirectional radiation pattern by using a gridslotted patch with tunable varactors loading. Design of tunable frequency bandwidth enhanced circular patch.
The triangular regions are separately excited using a coaxial feed to achieve frequency and pattern. The designed antenna will be applicable to cband longdistance radio telecommunications. As mentioned earlier, graphene is a monolayer of carbon atoms arranged in a hexagonal structure. Optically tunable microwave antennas for 5g applications. Frequency reconfigurable microstrip patchslot antenna. Pdf ultra wideband uwb microstrip patch antenna with. Tunability of an areaefficient microstrip patch antenna. Pdf study of electronically tunable circular patch antenna. Each probe excites one of the two fundamental modes of the antenna which are linearly polarized and orthogonal to each other. Graphenebased patch antenna tunable in the three atmospheric. The fundamental characteristics of tunable microstrip disk patch antenna with operated shortingvias were studied. Frequencytunable microstrip antennas, for cognitive radio applications, are proposed herein.
Frequency tunable microstrip patch antenna using rf mems technology. Results show that the novel antenna has a tuning range of 3. An active highimpedance surface for lowprofile tunable. Frequency tunable microstrip patch antenna using rf mems. The entire antenna geometry including the feed network measures 16mm x 16mm x 4mm with a patch radiator measuring only 10mm x 5mm. A reconfigurable antenna is an antenna capable of modifying its frequency and radiation properties dynamically, in a controlled and reversible manner. Pattern controlled and frequency tunable microstrip antenna loaded with multiple split ring resonators shobhit k. A reconfigurable microstrip cross parasitic antenna with. A brief detail of simulation results is tabulated in table 2. Antenna dualband frequencies, gain, efficiency, and radiation patterns are characterized. Langley a microstrip patch antenna operating in the 5 ghz range and tuned by liquid crystal lc is described.
Frequency reconfigurable microstrip patchslot antenna with. Located at the far edge of the patch antenna the edge opposite the feedline, a shunt impatt diode is assumed to be tuned to r 1. Rf mems switches are also used by huff and bernhard 6 to recon. For n3 and m3 in this paper, the array factor can be written as equation 2. Radiation pattern the patchs radiation at the fringing fields results in a certain far field radiation pattern. As an example or research done in this area from our group, a reconfigurable patch antenna array is shown below 1. Electrically tunable miniaturized bandstop frequency. Microstrip patch antennas on tunable electromagnetic. Theoretical simulations and experiments showed the significant advantages of such antenna. Reconfigurable antennas differ from tunable antennas as they modify behavior within a discrete, and not continuous, range and tend to uses switches. Selfstructuring antenna system with switchable antenna array and an optimizing controller. The radiation pattern of the antenna is shown in figure 2 while figure 3 shows the radiation pattern of the antenna with slot in the ground plane. Frequencytunable narrowband laddershape microstrip patch. Novel miniature printed monopole antenna with dual tunable band notched.
The proposed tunable patch antenna based on graphene has been designed and investigated. May 09, 2000 for antenna 20, which has a square patch that is a special case of a rectangular patch, the patch 24 generates a linearly polarized pattern with the polarization aligned with the yaxis. Silicon samples can be seen in the slot and an optical fibre is being held in place over one sample for tuning. Pattern controlled and frequency tunable microstrip antenna loaded. Introduction an adaptive antenna array is a geometrical combination of antenna elements that are dynamically driven via analog.
This antenna has an omnidirectional radiation pattern and a maximum. The series varactor tuned patch antenna configuration was the bandwidth enhancement. However, in both the antennas, variations of radiation patterns at di. The patch antenna radiation pattern is confined from zero to 180. Tunable miniaturized rf devices on magnetodielectric. Circularly polarized beamscanning microstrip antenna. Tunable antenna solutions are increasingly being used to enhance the radio performance of mobile handheld devices. Design and characterization of a tunable patch antenna loaded. Smart tunable antennas support more bandwidth and bands, minimize antenna size, and reduce user interference. Mechanically pattern reconfigurable antenna using metasurface. A widely tunable compact patch antenna request pdf. Citeseerx document details isaac councill, lee giles, pradeep teregowda.
Pattern controlled and frequency tunable microstrip antenna. A slot antenna utilizing shunt switches 1, a tunable small patch antenna able to switch between 800 mhz and 900 mhz using variable capacitors and transistors 2, by loading a slot antenna with two lumped variable capacitors. A tunable, or active, antenna with improved efficiency needs less transmission power from the phones amplifier and saves battery life, shamblin says. 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 intentional redistribution of the rf currents over the. Part of theamerican studies commons this thesis is brought to you for free and open access by the graduate school at scholar commons. Index terms adaptive arrays, field patterns, impatt diode, microstrip patch antennas, smart antennas, tunable antennas, tunable impedance i. Patch antennas are fundamental elements in many microwave communications systems. This paper presents a novel tunable frequency microstrip patch antennausingtherfmemstechnology. Losses in the commercially available lc material at these frequencies give rise to antenna.
Reconfigurable microstrip patch antenna for wlan software defined. Characterisation of tunable graphene antenna sciencedirect. Design of tunable frequency bandwidth enhanced circular patch antenna by varying air gap. The array factor of five patch antennas is derived from the m by n planar array formulation as equation 1 5. Sdr reconfigurable antenna, wlan antenna, tunable microstrip patch antenna. The pattern reconfigurable metasurfaced parms antenna is composed of a planar semicircular ms placed directly atop of a planar circular patch antenna with a diameter of 70 mm 1. The other patch is a parasitic one of tunable electrical size for beam scanning. To show the versatility of full tunability, a tunable microstrip patch antenna is designed to operate at 60ghz that uses a tunable impedance element capable of realtime changes to its resistance and reactance values. Tunable hshaped microstrip antenna with dual feeding. 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. Antennas research electromagnetics research group emrg. The tunable antenna as claimed in claim 1, further comprising a platform ground, wherein the platform ground is at least one of a fuselage, a wing, or a pod of an aircraft. To achieve tunable resonant frequency, bandwidth and radiation pattern, the antenna is further loaded with coplanar waveguide cpw on which microelectromechanical system mems capacitive switches are placed periodically. A tunable metamaterial in integrated circuit structures is investigated through an example of a microstrip patch antenna on a mushroomtype electromagnetic bandgap ebg structure.
The tunable antenna as claimed in claim 1, wherein the switch comprises at least one of a microelectromechanical system, a pin, or a transistor. Pdf pattern controlled and frequency tunable microstrip. The simulated tuning range is 8% while the measurements showed a range of 4%. The antenna is symmetrically loaded with four varactor diodes to simultaneously tune these two modes.
A tunable microstrip patch antenna with switchable. A lowprofile frequency reconfigurable gridslotted patch antenna. The antenna is a microstrip yagiuda antenna consisting of two similar square patches. To achieve tunable resonant frequency, bandwidth and radiation pattern, the antenna is further loaded with coplanar waveguide cpw on which microelectromechanical system mems.
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 depiction of the tunable antenna system can be seen in. The proposed antenna has a square patch that is divided into four triangular regions using diagonal rows of vias. As predicted, the radiation pattern for the microstrip patch antenna is directional in pattern. With the maturity of the rf switch and tunable capacitor, tunable antennas have become a reality on mobile terminals. The united states of america as represented by the secretary of the air force. In addition, it was recently demonstrated that patch antennas on a self biased ferritedielectric composite substrate showed a miniaturisation factor of 5, a 600% enhanced bandwidth and a high ef. The tunable in frequency, bandwidth, and radiation pattern is achieved by loading the antenna cpw on which rfmems capacitive switches are placed. Tunable handset antenna for lte global roaming band 2. Evaluating the robustness of tunable adaptive antenna arrays. This proposed design has a simple structure and a compact dimension of 24. Wideband, multiband, tunable, and smart antenna systems. The directivity of patch antennas is approximately 57 db. To have a better understanding, consider the following figure, which represents the radiation pattern of a dipole antenna.
The posts are short circuited to the ground plane via a. Design modifications directed toward bandwidth expansion generally yield 10% to 40% bandwidth. To design a smaller patch antenna, a cost function was created for the optimizer to maintain the bandwidth and resonance frequency of the baseline antenna with a tunable element enabled. The proposed pattern controlled and frequency tunable metamaterial antenna demonstrates efficient reconfigurable reflection coefficient, radiation pattern and current density performance. A compact single layer coaxial probefed microstrip antenna with frequency. Pdf logperiodic patch antenna with tunable frequency. The patch antenna is designed as a halfwavelength resonator of an ebg loaded microstrip transmission line. Reconfigurable stacked microstrip patch antenna for multi. It shows that this antenna realizes 370mhz tunable range, from 1.
A novel frequencytunable antenna with a wide tuning range. The antenna consists of two stacked substrates and three metal layers. The integration of monolithic microwave circuits and antennas are becoming easy today. Tunable patch antenna using semiconductor and nanoscale barium strontium titanate varactors samuel andrew baylis university of south florida follow this and additional works at. Pattern controlled and frequency tunable microstrip. The basics of patch antennas, updated orban microwave. Tunable and electronically steerable microstrip antenna. Parasitic circular patch antenna with continuously tunable. The fields are linearly polarized, and in the horizontal direction when viewing the microstrip antenna as in figure 1a well see why in the next section.
However, patch antennas receivetransmit signals over a very narrow bandwidth typically a maximum of 3% bandwidth. Tunable and electronically steerable microstrip antenna tunable and electronically steerable microstrip antenna jose, k. A lowprofile frequency reconfigurable gridslotted patch. This thesis does not include proprietary or classified information. Microstrip patch antennas on tunable electromagnetic band. An omnidirectional microstrip patch antenna, capable of reconfiguring both polarisation and radiation pattern is proposed.
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 antenna is feed at the center of a circular patch with a ring slot. The element factor ofa single patch antenna is expressed as equation 5. Feb 28, 2018 pattern controlled and frequency tunable microstrip antenna loaded with multiple split ring resonators abstract. A tunable microstrip patch antenna with switchable polarization. In the representation of radiation pattern, we often come across different shapes, which indicate the major and minor radiation areas, by which the radiation efficiency of the antenna is known. The rotational symmetry of the antenna helps maintain the impedance and radiation pattern at different polarization angles. Patch antenna and method for impedance, frequency and pattern tuning. In this letter, we propose a tunable patch antenna made of a slotted rectangular patch loaded by a number of posts close to the patch edge. This antenna provides a good matching in relatively wide band and it allows choosing the type of pattern characteristic.
Design of a frequency reconfigurable microstrip patch antenna for. Reconfigurable antennas may be designed to provide tunable frequency bands, dynamically alter their polarizations, or have variable radiation patterns. Tunable miniaturized rf devices on magnetodielectric substrates with enhanced performance a dissertation presented by guomin yang to the department of electrical and computer engineering in partial fulfillment of the requirements for the degree of doctor of philosophy in electrical engineering northeastern university. One patch is driven with two orthogonal feeds for a cp wave excitation. We propose a reconfigurable design of a metamaterialinspired microstrip patch antenna, capable of tuning the frequency spectrum. Normalized radiation pattern for microstrip patch antenna.
A novel memsbased frequency tunable rectangular patch. 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. Uda principle 3 and tunable parasitic patch size method presented in ref. A planar parasitic array antenna for tunable radiation pattern. Design and characterization of a tunable patch antenna loaded with. Circularly polarized beamscanning microstrip antenna using a. Frequencytunable and pattern diversity antennas for. Electronically tunable magnetic patch antennas with metal. Finally, the design of the phased array is applied to a gnss user receiver in a realistic railway environment. A continuously tunable antenna is proposed in the approach 21, where a single pin diode and varactor are used. Patch antennas loaded with different resonator elements by ignacio moreno barreiro b. The designed switchable ebgpatch antenna is fabricated and tested. A radiation pattern reconfigurable antenna designed using metasurface ms is proposed in this study.
Pdf differentiallyfed aperturecoupled magnetoelectric. The approach is based on tuning the operating frequency of a bandpass filter that is incorporated into a wideband antenna. Oct 24, 2018 the proposed reconfigurable cross parasitic antenna works according to microstrip yagi. If the antenna had a 100% radiation efficiency, all directivity would be converted to gain. Pattern controlled and frequency tunable microstrip antenna loaded with multiple split ring resonators abstract. While the substrate of the antenna is kapton polyimide film with a thickness of 75. Tunable microstrip patch antenna and control system therefor ep1014487a1 en 19981223. Next well consider more aspects involved in patch microstrip antennas. A fluidically tunable, dualband patch antenna with closely. If diode 1 is turned on but diodes 2 and 3 are off, the current can flow through the diode, and the current path. Patch antennas on ferrites substrates showed tunable radiation frequency, polarisation diversity, and beam steering. For any patch antenna operating in the lowest order mode, tm 11 for a circular patch and t 10 for a rectangular patch, a linearly polarized radiation pattern can be generated by exciting the patch 24 at a single feed point such as feed point 28.
This letter presents a novel ultrawideband uwb antenna with tunable notched band. In this paper, we propose a novel reconfigurable microstrip patch antenna having frequency and. This radiation pattern shows that the antenna radiates more power in a certain direction than another direction. 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.
Tunable microstrip patch antenna and control system. 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. Tunability of an areaefficient microstrip patch antenna at 60ghz. Tunable srrbased substrate for a microstrip patch antenna.
818 1146 1434 239 1057 293 749 872 1295 611 322 5 1229 1480 340 1454 1300 1288 73 699 693 1532 609 1425 807 1239 1463 1474 1541 625 538 496 176 1482 216 669 738