A compact antenna architecture including a patch antenna array, tunable phase shifters, a feed network and a bias network is proposed. A triangular patch antenna for uhf band with microstrip feed line for rfid applications twinkle kundu1 and davinder parkash2 1m. A recongurable antenna based on an electronically tunable. This paper presents the design and experimental investigations on a dielectric tunable microstrip antenna on barium strontium titanate substrate. In this paper, an electronically tuned circular patch antenna with good radiation pattern is proposed and studies. The presence of arrays of microstrip elements provides greater directivity, higher. Abstract the tunable patch antenna configurations are becoming popular and attractive in many aspects.
The design and experimental investigation on electronically tunable microstrip antenna is presented in this paper. But patch antennas can also be formed with a collection of multiple patches on a dielectric substrate. Optimized tunable frequency microstrip patch antenna ieee xplore. Recently graphene got a lot of attention for its potential use in microwave applications owing to its tunability properties. Us4475108a electronically tunable microstrip antenna.
The antenna consists of four sup patches connected to one feed line, each sub patch generates a single band. An electronically tunable broadband eshaped patch antenna espa is proposed and analyzed using equivalent circuit concept. Electronically tunable microstrip patch antennas ieee conference. The parasitic patch is loaded with a narrow square slot and four lumped varactors along with their dc. Each probe excites one of the two fundamental modes of the antenna which are linearly polarized and orthogonal to each other. These observations have been made as a first step towards the realization of an electronically tunable microstrip antenna taking advantage of the voltage tunable dielectric substrate. In this paper, a polarization tunable microstrip patch antenna is proposed.
Electronically steerable planar phase array antenna. Electronically tunable miniaturized antennas on magnetoelectric substrates with enhanced performance article pdf available in ieee transactions on magnetics 4411. Graphene changes its resistance values from very high values to very low values upon the application of a voltage bias. A millimeterwave inflatable frequencyagile elastomeric antenna. The proposed reconfigurable cross parasitic antenna works according to microstrip yagi. The element consists of multilayer printed circuits with a c patch coupled to a delay line through a ring slot. Bahl, a frequency agile microstrip antenna, in proceedings of the antennas and propagation society international symposium. A tunable microstrip patch antenna with switchable. Design and demonstration of an electronically scanned reflectarray antenna at. This is a tutorial series on microstrip patch antenna design with inset feed in cst microwave.
A reconfigurable microstrip cross parasitic antenna with. A reconfigurable antenna is an antenna capable of modifying its frequency and radiation properties dynamically, in a controlled and reversible manner. 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. The antenna is symmetrically loaded with four varactor diodes to simultaneously tune these two modes. A microstrip electronically scannable antenna is realized by means of an array of disc elements that are separated from a common ground plane by a dielectric medium. Us4053895a electronically scanned microstrip antenna. Optimized tunable frequency microstrip patch antenna.
This was mainly due to the advent of ferrite thin film technology and tunable. Widely tunable multiband reconfigurable patch antenna for. By placing a variable capacitor at the input of the sub patches, the impedance matching frequency of the antenna can be tuned over a wide range starting from 0. The tunable parasitic element excited by coaxial feeding shows dual. A basic reectarray antenna is composed of a planar array of microstrip patches, which are illuminated by a. A symmetric twolayer, singleinput inexpensive threeelement array at 1ghz employing varactors as tuning mechanisms are designed. A reflectarray element with switchable phase shift for an electronically beam scanning reflectarray operating in the xband is presented. Tunable and electronically steerable microstrip antenna. Although this antenna has a low bandwidth, electronic tuning allow a. The antenna tuning is realized by changing its effective electrical length, which is controlled by the bias voltages across the pin diode.
This was mainly due to the advent of ferrite thin film technology and tunable substrate materials. The design is suitable for applications that involve electromagnetic sensing for biomedical applications that require the antenna to be in contact with the material being monitored, providing the ability to. Experimental investigations on electronically tunable microstrip antennas experimental investigations on electronically tunable microstrip antennas jose, k. In this paper, a design of compact tunable microstrip antenna using frequency selective surface fss is proposed and presented. Tunable microstrip patch antenna using fss for wlan. Pdf electronically tunable miniaturized antennas on. The overall design steps for designing the patch antenna in cst microwave studio involves. Thus, it is necessary to compensate the plf by tuning the axial ratio and tilt angle of the receiving antenna.
Microfluidic flexible substrate integrated microstrip. The proposed antenna is a microstrip yagiuda antenna consisting of two square patches. Patch antennas are fundamental elements in many microwave communications systems. Frequencytunable narrowband laddershape microstrip patch. Tunable srrbased substrate for a microstrip patch antenna. In this paper, a frequencytunable antenna is proposed based on a previous. Itoh, a slot antenna with electronically tunable length, in proceedings of the antennas and propagation society symposium, pp. Improving the performance parameters of microstrip patch antenna by using ebg substrate gaurav kumar sharma 1, narinder sharma 2 1 m.
The narrow bandwidth of conventional microstrip antennas has many restrictions in realtime applications. The use of graphene as a variable resistor is discussed, and. The integration of monolithic microwave circuits and antennas are becoming easy today. Despite substantial evidence suggesting that a diet high in fruit and vegetables fv is associated with reduced risk of cancer, only 21% of children in the uk consume the recommended 5 portions of fruit or vegetables a day. In microwave and other wireless applications, an antenna plays a very efficient job. College of engineering and technology, bareilly1 hod ec dept. Pdf study of electronically tunable circular patch antenna. A low profile antenna that provides high isolation to backside radiation, is flexible to allow conformal mounting to a surface, and can be tuned over a wide frequency range is conceived. Tunable patch antenna using semiconductor and nanoscale. A microstrip patch electronically steerable parasitic array radiator espar antenna with reactancetuned coupling and maintained resonance abstract. A triangular patch antenna for uhf band with microstrip. This investigation has been made as a first step toward the. Design and development of electronically tunable microstrip antennas.
A design of a low profile reconfigurable microstrip patch antenna is presented. When a conducting path for rf current is connected between the tuning strips and the patch, the tuning strips increase the effective length of the patch and lower the antennas resonant frequency, thereby allowing the antenna to be frequency tuned. The series varactor tuned patch antenna configuration was the bandwidth enhancement. One patch is driven with two orthogonal feeds for cp operation, whereas the other patch is a parasitic one of tunable electrical size for beam scanning. In one embodiment the varactor is in shunt with a half wave open circuited radiator and adds electrical length to the antenna. A novel tunable microstrip patch antenna using liquid crystal. The design of an electronically tunable reectarray cell is presented. Related content design and development of electronically tunable microstrip antennas v k varadan, k a jose and v v varadanquantitative feedback theory control of a.
One of these is the microstrip patch antenna which is fabricated on a substrate layer. Design and development of smart microstrip patch antennas. The antenna is a microstrip yagiuda antenna consist. The microstrip patch antenna is supported by a pdms membrane suspended over an. Microstrip antenna on tunable substrate microstrip antenna on tunable substrate jose, k. The fundamental structure of the antenna consists of a rectangular patch with a pin diode mounted across the slot cut in the patch. Pdf in this paper, an electronically tuned circular patch antenna with good. Us8872725b1 electronicallytunable flexible low profile.
Therefore, microstrip yagiuda antenna turns to be a good candidate for attaining scannable cp beam. Electronically tunable reflectarray element based on c. Either single or multiple feed lines are used to provide excitation to the antenna. A rectangular microstrip patch antenna is electrically a half wave length. An antenna serves as the communicator between the rf frontend circuitry and the radiation and propagation of electromagnetic waves in free space. Graphenebased tunable microstrip attenuators and patch. The tunable patch antenna configurations are becoming popular and attractive in many aspects. Realizing an electronically tunable reflectarray using varactor diodetuned elements. Liquid crystal tunable microstrip patch antenna iet.
A new approach to parasitic phasedarray antennas is presented. Design of frequency and polarization tunable microstrip antenna. Circularly polarized beamscanning microstrip antenna. A metasurface for reflecting an incident wave to effect beam steering, the metasurface comprising. It is already established that the change in dielectric constant of barium strontium titanate. Tunable hshaped microstrip antenna with dual feeding. Us5943016a tunable microstrip patch antenna and feed. Electronically tunable magnetic patch antennas with metal. A microstrip patch antenna operating in the 5 ghz range and tuned by liquid crystal lc is described. The antenna cavity is filled precisely with air using an electronic ne100. The fundamental structure of the antenna consists of a. A microstrip antenna with a linearly polarized radiating patch is varied in resonant frequency by an electronic tuning technique. Design modifications directed toward bandwidth expansion generally yield 10% to 40% bandwidth.
Wo2045267a1 electronically steerable planar phased. Realizing an electronically tunable reflectarray using. Tunable and electronically steerable microstrip antenna tunable and electronically steerable microstrip antenna jose, k. The resonant frequency of the antenna is found to change more. Under the optimum conditions of espa, the effect of bias voltage of tunnel diode on the performance of the antenna. In this paper, a flexible microstrip patch antenna sensor is proposed for monitoring of the moisture content of lubricating oil. A patch antenna is provided with one or more tuning strips spaced therefrom and rf switches to connect or block rf currents therebetween. However, patch antennas receivetransmit signals over a very narrow bandwidth typically a maximum of 3% bandwidth. The sensor identifies liquids having different effective dielectric constants by detecting changes in the resonance frequency. This paper presents the design of a graphenebased electronically tunable microstrip attenuator operating at the frequency of 5 ghz.
This paper presents the performance of a varactor loaded, probefed microstrip patch antenna. In this paper the design of a compact, efficient and electronically tunable antenna is presented. The center of each disc element is electronically short circuited to the ground plane. A dc bias voltage is combined with the excitation signal to regulate the capacitance of a varactor diode mounted in the antenna structure. The proposed antenna comprises a radiation patch, a metal ground plane, and a pdms substrate with microchannels. The phase shift is obtained by adjusting the length of the delay line. The design of a frequency reconfigurable dualband hshaped microstrip antenna fed by two coaxial probes is presented. Losses in the commercially available lc material at these frequencies give rise to antenna efficiencies ranging from 35 40 at best and falling to around 20 when the lc is in the unbiased state. A twodimensional 2d beam steerable phased array antenna is presented comprising a continuously electronically steerable material including a tunable material or a variable dielectric material, preferred a liquid crystal material. The designed antenna module microstrip patch and fss structure operates in the cband at 56. Graphenebased electronically tuneable microstrip attenuator. The magnetic patch antennas showed an enhanced bandwidth of 50% over the nonmagnetic patch antennas, a signi. Planar oriented antennas, such as microstrip patch and printed dipole have attracted significant attention of the community of antenna engineers because it.
The effective tunable patch size method has been used to achieve this feature. Study of electronically tunable circular patch antenna. Tm622 abstract a twodimensional 2d beam steerable phased array antenna is presented comprising a continuously electronically steerable material including a tunable material or a variable dielectric material, preferred a liquid crystal material. Graphenebased tunable microstrip attenuators and patch antenna abstract. A microstrip patch electronically steerable parasitic. Electrically tuned microwave devices using liquid crystal. Design and analysis of slotted microstrip patch antenna, a. College of engineering and technology, bareilly2 abstract a novel reconfigurable microstrip patch antenna with frequency and polarization diversities is. A recongurable antenna based on an electronically tunable reectarray sean v. A tunable microstrip patch antenna with switchable polarization akansha tandon1, mr. Experimental investigations on electronically tunable.
Uda principle 3 and tunable parasitic patch size method presented in ref. The effects of notch parameters such as notch length, width, and position are analyzed to select the optimum values for broadband operation of espa. The effects of notch parameters such as notch length, width, and. Electronic tunablity is achieved by connecting varactor diodes thus altering the capacitance of the patch and hence resonant frequency. Microstrip patch antennas on tunable electromagnetic. The element integrated with a pin diode to control the phase is assembled.
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