However, patch antennas receivetransmit signals over a very narrow bandwidth typically a maximum of 3% bandwidth. Swls and radio amateurs living in confined areas such. By tuning the resonant frequency of the radiating patch slot antenna in order to be close to that of the combined dra, a wide impedance bandwidth can be achieved. A novel, cedarshaped, coplanar waveguidefed frequency reconfigurable antenna is proposed. Wideband active integrated antenna for rfid tag applications. This research proposes afresh wide bandwidth codesign approach of low noise amplifier lna with active antenna for mobile 3rd, 4th and specially 5th generation communication technologies.
Broadband antennas over electronically reconfigurable. Single and dualpolarized slot and patch anten nas with. Microstrip uslot aperture coupled antenna for wimax. The phase bandwidth for this case maximum instantaneous bandwidth for an amc is 3. The series varactor tuned patch antenna configuration. Simplest varactor tuned loop antenna ever i just wanted to share what has proven to be a easy to build, trouble free loop setup that is easy to fold up when its not in use.
Reconfigurable dualband patch antenna using varactorloaded slot. A simple varactortuned loop antenna matching network. The fpa is a rectangular patch antenna divided into three sections with varactor diodes placed across the gaps between the sections. Spread spectrum, cdma code division multiple access enables one to incorporate many users within a relatively wide bandwidth. Us5142255a planar active endfire radiating elements and. Three major approaches are used for binding this research. Their operating mechanisms have been discussed and methods for improving the performance, such as bandwidth enhancement, size reduction, and gain improvement, have been presented.
A varactortuned dualband slot antenna university of michigan. With cellular networks in the 800900mhz band reaching capacity limits, pcs18001900mhz is proving to be the best alternative for cellular operators. Wide bandwidth varactortuned patch antenna electronics. Assuming further adjustments, they can be well exploited in order to increase the bandwidth. Thats a common problem and one great reason to have a wider bandwidth antenna if possible so that insitu shifting wont lose you so much gain. Reconfigurable dualband patch antenna using varactor. By tuning the resonant frequency of the radiating patchslot antenna in order to be close to that of the combined dra, a wide impedance bandwidth can be achieved.
The proposed approach is useful in the design of compact pcaia with good radiation characteristics for applications in microwave wireless systems. Simulated return loss of microstrip patch antenna on silicon. A novel frequencytunable antenna with a wide tuning range ningli zhu and wei zhang institute of microelectronics, peking university, beijing 100871, china abstract in this paper a varactorloaded antenna with a wide tuning range and good directivity is designed. For further widening the vswr bandwidth, an xwainspired antenna, referred to as an icross antenna, is designed. This tunable microstrip patch antenna enjoys a substantially wider impedance bandwidth than the same microstrip antenna without the varactor. Conclusion a novel reconfigurable dualband patch antenna design using a varactor loaded slot has been proposed. Through the research represented by this work, the properties of the series varactor tuned patch antenna, herein referred to as the fragmented patch antenna or fpa, were explored and optimized. The three sections are designed to produce two tunable resonance frequencies that overlap, thereby creating a.
The patch is suspended on one corner of the pcb shown on the top portion of fig. Another commonly used way to specify bandwidth is percentage bandwidth, which is explained in more detail in the theory section. Two parallel cslots on the patch elements are employed to perturb the surface current. As you can see from the plot, the absolute bandwidth over which the antenna meets the 2. Measured performance of the antenna demonstrates a bandwidth of 30 mhz at 2. As a result, an innovative patch antenna was produced that yielded 63. Wideband tunable pifa antenna with loaded slot structure. Presented is a fragmented patch antenna fpa that offers an.
A reconfigurable wideband and multiband cslot patch antenna with dualpatch elements is proposed and studied. Conclusion a novel reconfigurable dualband patch antenna design using a varactorloaded slot has been proposed. A dual bandnotched reconfigurable dielectric resonator antenna dra is proposed in this paper. Parametric studies for the effect of gap and feed point location, along with radiation characteristics have been investigated. Moreover, the typical stepped impedance feedline and partial ground plane with one rectangular notch are adopted for contributing for better.
Frequencytunable narrowband laddershape microstrip patch. A varactor tuned indoor loop antenna for hf reception pdf. Trask, indoor loop antenna 1 february 2009 a varactortuned indoor loop antenna by chris trask n7zwy sonoran radio research p. The first design proposes a monopole antenna where asymmetric flower type corners and mushroom shape encloses by t. Several antenna designs are investigated to determine the optimal design.
It also has the advantages of low profile, light weight. This vco uses a varactor tuned microstrip patch antenna and may be used as an element in quasioptical power combining. A compact dualpolarized double shaped patch antenna. Usually the feeding system is a major bandwidth limitation. Dogbone slots field distribution normal slots field distribution design of wide bandwidth microstrip patch antenna. Wide beamwidth circularly polarized antenna and its application in a sequentialrotation array with enhanced bandwidth. The proposed antenna is fabricated and measured for all states. A compact monopole antenna with rectangular and triangular slots etched on the partial ground and the center of the rectangular patch achieves a wide usable fractional bandwidth of 148% in. Standard, singlelayer patches are typically narrowband 2 and tuning approaches.
A varactor tuned patch oscillator for active arrays p. The bandwidth has been increased to more than double as compared to the original patch, keeping the overall size of the antenna nearly the same. A reconfigurable wideband and multiband antenna using dual. Microstrip patch antenna, lprobe, wideband antennas, proximity coupling. Varactortuned microstrippatch antenna with frequency and. This vco uses a varactortuned microstrip patch antenna and may be used as an element in quasioptical power combining. The break in the shield can be made in the center of the loop or by connecting the shield to the center conductor of the side which is the ground side of the feed in wire. For continuous frequency tuning, the integration of varactor diodes within an antenna is the. Review of low profile substrate integrated waveguide cavity. How to predict groundplane effects on patch antenna. Design philosophy 6 the case of a planar array antenna, consisting of radiators located on a fixed lattice as the one depicted in figure 1 is considered.
Indeed, they presented a microstrip patch antenna with varactor diodes. As reported in 30, a power division network was employed in a monopole antenna, and a 10 db bandwidth of 51% is obtained. This work first moment focuses on the concept of reconfigurable wide bandwidth using novel extraction technique of slotted monopole antenna with rf carbon nanotube cnt network. Review of low profile substrate integrated waveguide. For the dual band sdr system, the use of a single antenna with a wide bandwidth to cover both of the bands can be limiting for low power level signal applications due. A prototype was fabricated and tested in the lband frequency range. Ihee and 335 a varactortuned patch oscillator for active arrays. Design of a dualband frequency reconfigurable patch antenna. A patch antenna with a varactorloaded slot for reconfigurable. Wideband rectangular microstrip patch antenna using l. Products antennas array antennas microstrip fixed array. The ebg structure is based on the jerusalem cross geometry and is sandwiched between two 1.
If you look at the picture above there is a break in the center. The variable capacitance diode loading method is taking in detail, which. A single selfbiased through the rf port, twostage low noise amplifier has been integrated with a proximity coupled patch antenna having a new feed structure. Pdf the operating frequency of a coplanar patch antenna is tuned using a varactor. By varying the voltage across the varactor, the capacitance of the equivalent antenna circuit and thus the resonant frequency of the antenna can be changed. A compact dualpolarized double shaped patch antenna with. I have added the shield of the pickup loop to the drawings. An aperturecoupled linear microstrip leakywave antenna. The patch is integrated into the feedback loop of a series feedback oscillator. York, member, ieee abstractthe design and construction of a relatively wideband quasioptical voltagecontrolled oscillator vco is described. The main advantage of the former antenna is its compact size, while the tuning circuit of the latter. The narrow bandwidth of conventional microstrip antennas can be overcome by using a varactor diode to vary its resonant frequency over a fairly wide bandwidth. Wideband tunable pifa antenna with loaded slot structure for. Lowcost beam steerable antennas using parasitic elements.
A vswr of less than 2 is realized across a wide frequency range of 2. Ronsch, perhaps if its nonresonant, the usual reasons for increasing the diameter reducing resistance, improving efficiency, making it more broadband, etc probably dont apply as much if. The antenna can operate in two dualband modes and a wideband mode from 5 to 7 ghz. Four pin diodes are inserted on the antenna surface to variate the current distribution and alter the resonant frequencies with different combinations of switches. Please verify your dongle is working with a good antenna before complaining that you cannot receive something. Patch antennas are fundamental elements in many microwave communications systems. The presented antenna uses lowcost fr4 substrate with a thickness of 1. Oct 26, 2018 this work first moment focuses on the concept of reconfigurable wide bandwidth using novel extraction technique of slotted monopole antenna with rf carbon nanotube cnt network. Trask, varactor tuned loop antenna 2 16 september 2008 introduction loop antennas are of interest to a wide range of users, from shortwave listeners swls and radio amateurs to designers of directionfinding receiver systems.
Chang, an active inverted patch antenna with wideband varactortuned capability, ieee mtts international microwave sumposium digest, vol. The varactortuned phase shifters are placed between the antenna elements. Implementation of polarization agility in planar phased. The study of the effect of the mutual coupling occurring between the individual radiators in the array antenna and a discussion on the antenna physical implementation are also included. Jul 30, 2009 the fpa is a rectangular patch antenna divided into three sections with varactor diodes placed across the gaps between the sections.
Varactor tuned split patch test antenna introduction 0 2 4 6 8 10 12 14 16642 0 2 4 6 varactor reverse bias voltage v gain dbi split patch absolute gain vs. The simulated radiation patterns at both bands for c 0. Reconfigurable wide bandwidth using novel extraction. An optimal design is defined as having the maximum attainable tuning bandwidth while. Siw structure keeps the advantages of conventional metallic waveguides, such as high factor, high selectivity, cutoff frequency characteristic, and high power capacity. The first design proposes a monopole antenna where asymmetric flower type corners and mushroom shape encloses by tslot is cut on the patch. A reconfigurable wideband and multiband cslot patch antenna with dual patch elements is proposed and studied. In this paper, a reconfigurable microstrip patch antenna with rf pin diode switches is implemented for dual band of 2. Bandwidth enhancement of microstrip patch antenna using. Phased array antennas are a natural choice as the foundation for many steerable antenna platform due to its exibility and gain scalability. Beam steerable antennas are considered as a possible solution for meeting challenges in military and civilian systems such as satellite communication networks, automotive collision avoidance radar, base stations and biomedical applications. A hybrid dra resulting from the combination of a ringshaped dielectric resonator and a circular microstrip patch, fed by a resonant slot, is presented in 55 and shown in figure 26. Lprobe 1 driving technique is able to increase relative bw more. The loop is 1 meter in circumference and its made out of thick solid copper wire.
Tunable patch antenna using semiconductor and nanoscale. Because antenna applications often do not require a broad instantaneous. Patch antennas, being limited in bandwidth, are often modified to either be tunable or to yield extended instantaneous bandwidth. The entire approach is folded into four different designs. May 23, 2018 this research proposes afresh wide bandwidth codesign approach of low noise amplifier lna with active antenna for mobile 3rd, 4th and specially 5th generation communication technologies. Introduction microstrip patch antennas are usually designed to have small relative bandwidth bw, 310%. Pdf tunable coplanar patch antenna using varactor researchgate.
Microstrip antenna design handbook, artech house 2001. They are similar at both bands with broadside gain 7. In 1995, huynh and lee 19 presented an experimental study of a new kind of broadband antenna with impedance bandwidth of 47%. Reconfigurable low profile antennas using tunable high.
A novel frequencytunable antenna with a wide tuning range. Substrate integrated waveguide siw technique has been developed to design microwave and millimeter wave components and subsystems. Mortazawi, an lband tunable microstrip antenna using multiple varactors, antennas and propagation society international symposium, vol. A varactor tuned antenna investigated in paper iv is for digital television signal reception in a small portable device. By referring to 8, an eshaped rectangular patch is known as a wideband antenna due to two parallel slots cut into the rectangular patch. In a transceiver system, the antenna is the final block in the transmission region and is the first block in the receiving region so, the fundamental understanding of antenna parameter and working are prerequisite to develop an antenna solution for smart systems so, in this chapter basics of microstrip patch antenna are elaborated to define the. Request pdf varactortuned microstrippatch antenna with frequency and polarisation agility. The rf switch tunable antenna in paper v operates at four cellular bands. I just wanted to share what has proven to be a easy to build, trouble free loop setup that is easy to fold up when its not in use. Moreover, the typical stepped impedance feedline and partial ground plane with one rectangular notch are adopted for contributing for better impedance. Widebeamwidth circularly polarized antenna and its.
Single and dualpolarized slot and patch antennas with wide tuning ranges by carson r. Ihee and 335 a varactortuned patch oscillator for active. A varactortuned patch oscillator for active arrays p. The ends of the wire go into a terminal block with 4 connections.
A rectangular dielectric resonator excited by stepped offset microstrip feedline generates multiple resonant modes for wideband performance. The three sections are designed to produce two tunable resonance frequencies that overlap, thereby creating a wide 63. A lowcost cpwfed multiband frequency reconfigurable antenna. By etching out a symmetric portion of crossed slots from the surface of a square probefed patch, a compact, probefed microstrip patch antenna with a high isolation of 38 db between the two ports is achieved in 11. Scattering and radiation properties of varactortuned microstrip. A frequencyselecting technique for mobile handset antennas. Among other categories, design of a widebanddualband relatively wide slot antenna fed by a microstrip line can be mentioned. The series varactor tuned patch antenna configuration was the bandwidth enhancement method explored in. A frequency reconfigurable patch antenna design based on the. Results have indicated that, when the antenna is mounted at either end of the side edge, a large bandwidth 250 mhz centered at about 2442 mhz can be achieved, making the antenna easily cover.
The bandwidth of the single patch antenna can also be increased by implementing internal structures such as shorting pins or slots. The return losses of the lower patch operating by itself shows one single main resonance, resulting in a very narrow useful bandwidth. Presented is a fragmented patch antenna fpa that offers an easily manufactured solution. Design modifications directed toward bandwidth expansion generally yield 10% to 40% bandwidth. Optimization of impedance bandwidth of a stacked microstrip. Results have indicated that, when the antenna is mounted at either end of the side edge, a large bandwidth 250 mhz centered at about 2442 mhz can. Chang, an active inverted patch antenna with wideband varactor tuned capability, ieee mtts international microwave sumposium digest, vol. So, this antenna can be a proper driven patch to enhance stacked microstrip bandwidth.
1629 32 1231 721 560 1193 1094 1465 317 1266 124 942 1423 818 1103 1409 234 135 1190 196 1474 618 527 155 255 138 179 1234 25 54 404 781 537 1332 1123 218 941 1311 593 971 777 1012 180