Different techniques are used to achieve multiband and wideband operation of antenna. Two antenna prototypes with identical dimensions are designed, fabricated and measured. An antenna can be polarized depending upon our requirement. Reconfigurable antennas include frequency reconfigurable antenna, polarization reconfigurable antenna, and pattern reconfigurable antenna. Reconfigurable antenna has a potential to add some functionality to. Polarization reconfigurable square patch with shorting posts. Research article polarization reconfigurable patch antenna for wireless sensor.
By studying the surface current distributions at two. Polarization or polarisation for our british friends is one of the fundamental characteristics of any antenna. Multiband reconfigurable microstrip patch antenna hemantkumar mane, v. It forms solution to the problem of changing in impedance, in which polarization diversity counter the effect of fading in communication. Resonance behavior of single u slot microstrip patch antenna. The type of antenna polarization decides the pattern of the beam and polarization at the reception or transmission. A liquid metal conical helical antenna for circular. The current on the strip perturbed square ring slot antenna with reconfigurable polarization and the ground mainly. Introduction recently, a polarization reconfigurable antenna, which can offer various polarizations at the same operating. Dual feed degenerate mode patch is used as the starting point for. A ring slot antenna is a coplanar structure and as compared to a. This polarization can be either vertical or horizontal depending on the orientation of the patch. Actually, slot antenna is a radiating element formed by a slot in a metallic surface. As the antenna is reconfigurable it has two slightly.
Pdf polarization reconfigurable patch antenna for wireless. Right hand circular polarization rhcp is obtained as diode. Reconfigurable wideband circulalry polarized microstrip. A comparative analysis of a circularly polarized microstrip. Antenna gain calculator to calculate the frequencydbi of antennas,the calculator can calculate linear polarization, circular polarization and ellipticalpolarization of antennas based on selection. Lets start by understanding the polarization of a plane electromagnetic wave. Introduction this article introduces the basic concepts of patch antennas. It allows switching between right hand circular polarization rhcp and left hand circular polarization lhcp. Pin diodes are appropriately positioned to change the length of the u slot arms, which alters the antenna s polarization state. The proposed prototype design consists of two orthogonal arms as a patch, an inclined slotted asymmetric pentagonalshaped ground plane and a pin diode with a biasing circuit.
Perturbed square ring slot antenna with reconfigurable. A polarization reconfigurable patch antenna with loop slots onthegroundplane. Abstract a varactor diode is placed on every slot to alter the current direction, which determines the polarization state. Reconfigurable microstrip patch antenna with a uslot using. A reconfigurable patch antenna consisting of a square patch with two crossshaped diagonal slots is presented. We use a simple rectangular, half wave long, probefed patch operating in its fundamental mode as an example. Broadband microstrip patch antenna using slot semantic. Three pin diodes are inserted in ground plane that controls switching bands.
Printed slot antenna, multiband antenna, rejection. A transmit antenna needs a receiving antenna with the same polarization for optimum operation. A reconfigurable microstrip antenna for switchable polarization is proposed by corner truncated square radiating patch and independent biased pin diode to form linear polarization. The polarisation reconfiguration is controlled via onoff states of the pin diode. To overcome these index terms eshaped patch antenna, microstrip antenna, pin diodes, polarization agile, reconfigurable antennas, rf switches. Circularly polarized aperture coupled microstrip antenna with.
A frequency reconfigurable antenna using the fr4 substrate that switches between an ultra wide band, narrow band, and. Polarization of the wave radiated by an antenna is known as antenna polarization. By controlling the phase shift of applied currents through these probes, the antenna can be set to excite either the sum or the difference mode. Patch antenna is actually a patch antenna placed over a antenna base. A frequency reconfigurable antenna using liquid metal as switching mechanism was proposed by kelley et al. Memsswitched u slotted patch antenna for dual polarization the geometry of the polarization reconfigurable antenna is shown in fig. Survey on different types of reconfigurable patch antenna. Effect of slot on size of antenna with the help of slot size of microstrip patch antenna is reduced.
It can be linearly polarized or circularly polarized. Polarization reconfigurable antenna for midband 5g. Designing of reconfigurable multiband antenna for wlan. Varactor diode loaded reconfigurable patch antenna with. In this paper, an electromagnetic band gap ebg metasurface ms superstratebased circularly polarized antenna for the wimax 3. Design and fabrication of frequency reconfigurable and. Eshaped patch antenna with reconfigurable circular. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. Basic geometry and basic characteristics of patch antennas 3.
Microstrip patch antennae, microstrip dipoles, printed slot antennae. Design and analysis of compact u slot microstrip patch. A parametric study has been carried out to investigate the effects caused by different arm length and width. An electrical model to uslot patch antenna with circular. Frequency and polarization reconfigurable microstrip antenna. Reconfigurable patch antennas with fourpolarization. Study of frequency and polarization reconfigurable on. The antenna incorporates a novel positive and negative perturbation technique to achieve di. In order to obtain a maximum radiation efficiency and frequency bandwidth a thick patch substrate with a low. Tejbir singh assistant professor, subharti university, meerut, u. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces.
A broadband low crosspolarization uslot patch antenna array. The fundamentals of patch antenna design and performance. An innovative technique is used in this approach which combines among three techniques namely. Vahldieck, a reconfigurable slot antenna with switchable polarization, ieee microwave and wireless components letters, vol. Shorter slot length produces narrower axial ratio bandwidth. Vidmar, varactortuned microstrippatch antenna with frequency and polarisation. Most of those reconfigurable antennas can switch polarization senses between two cp states, or among one linear and two cp states. Jul 30, 2015 in this paper, a single layer asymmetric l slot loaded microstrip patch antenna for circular polarization is proposed. Reconfigurable microstrip patch antennas microstrip. In the reported literature, procedure to design them at any given frequency is not available. Microstrip patch antennas or simply patch antenna are increasingly useful because the antenna is printed directly onto a circuit board. For example, when the component is a capacitor, the operation frequency of the slot antenna can be decreased with increasing the capacitance value 1. A patch antenna radiates power in certain directions and we say that the antenna has. A smallsize element antenna for circular polarization was realized by using a circular patch antenna with a cross slot having different arm lengths.
A polarization recon gurable patch antenna with loop slots. It can be implemented by unequal length of cross slots on the patch, which are switched on and off using pin diodes. Slot antennas are used typically at frequencies between 300 mhz and 24 ghz. Polarization controlled microstrip antenna, ieee int. He invented the wideband u slot patch antenna and expanded the u slot technique to small size, dualtriple band, and circular polarization applications. A polarization switchable microstrip patch antenna with a. A single probefed reconfigurable circularly polarized microstrip patch antenna with a circular slot is proposed. Reference 7 proposed an aperture coupled square patch antenna with quadric polarization agility.
A microstrip patch antenna mpa is a type of antenna that consists of a conducting patch of any planar or nonplanar geometry on one side of a dielectric substrate with a ground plane on other side. As one right left side point of the circular slot is shorted between the inside of the slot and the rectangular patch, the proposed antenna yields right lefthanded circular polarization. Wideband radiation reconfigurable microstrip patch antenna. Antenna gain calculator to calculate the frequencydbi of antennas,the calculator can calculate linear polarization, circular polarization and elliptical polarization of antennas based on selection. A quadpolarization and frequency reconfigurable square ring. Survey on different types of reconfigurable patch antenna for wireless applications 1k. Circular polarization wideband eshaped patch antenna for.
In order to obtain polarization reconfigurability, several patch antenna configurations have been investigated 57. Sensors free fulltext reconfigurable diplexerbased. Blekinge institute of technology bth karlskrona, sweden september 20 supervisor. Polarization reconfigurable patch antenna for wireless. The polarisation of an antenna is determined by the wave radiated in a given direction that is identical to the direction of the electric field. The slot antenna is popular because they can be cut out of whatever surface they are to be mounted on, and have radiation patterns that are roughly omnidirectional similar to a linear wire antenna, as well see.
Keywords reconfigurable microstrip patch antenna, slots, swi tches, dual band, resonant frequency. Alternate feed methods a common variation in patch antenna design is the location and routing of the feed, to obtain a desired feedpoint impedance, to control the polarization, or for convenient layout. The two feeds are positioned on the right and left diagonal of microstrip antenna. An ieee fellow, he was the recipient of the 2009 john kraus antenna award of the ieee antennas and propagation society for exceptional contributions to the field of antennas. A polarization reconfigurable antenna can be seen in, where a circular slot was integrated in a circular microstrip patch. Polarization diversity can be achieved with single feed itself. Fries,mischa grani and rudiger vahdieck, a reconfigurable slot antenna with switchable polarization, ieee microwave and. Kishk published a paper on frequency reconfigurable u slot patch antenna. Reconfigurability denotes the reconfigurable computing capability of a system, so that its behavior can be changed by reconfiguration, i. The antenna is capable of switching from righthand circular polarization rhcp to lefthand circular polarization lhcp and vice versa, with the aid of two rf pin diodes that act as rf switches.
A reconfigurable slot antenna with switchable polarization. The lumped component can be used to alter antenna performances. Circularly polarized microstrip antenna is frequently realized by cutting the slot inside the patch and feeding it along the diagonal axis. A single layer wideband u slot microstrip resonance behavior of single u slot microstrip patch antenna patch antenna array casino menominee mishaped slot antenna for 2. Investigations on wideband uslot microstrip patch antenna. A compact u slot microstrip patch antenna with reconfigurable polarization is proposed for wireless local area network wlan applications. By using slot on rectangular patch with coaxial probe feed a wide bandwidth. Design of reconfigurable microstrip patch antenna for wlan. On the use of slots in the design of patch antennas. By simply changing the bias status of two pin diodes through a ttype bias device, the antenna can work as two independent inverted lshaped slots, and realize reconfigurable performances.
The shape and size of the slot, as well as the driving frequency, determine the radiation pattern. Circularly polarized microstrip patch antenna for wireless. In this paper, a novel low cost, singlefeed and polarization reconfigurable antenna is designed for midband 5g applications. Single feed lslot microstrip antenna for circular polarization. Antenna theory beam and polarization tutorialspoint. This effect can be done by changing the path of current.
A circularly polarized smallsize microstrip antenna using a. Click here to go to our page on circular patch antennas new for september 2018. The simple design consists of two slots and two feeds. The designed dimensions of uslot patch antenna are given in. Reconfigurable microstrip patch antenna with switchable plarization, etri tournal, 283, june 2006. Pdf polarization reconfigurable uslot patch antenna. The proposed design approach is based on the use of two pairs of switches in order to. On the design of slot cut circularly polarized circular. The uslot microstrip patch antenna is designed at 2. A square, loopshaped slot line that divides the patch conductor into interior and exterior sections is located at the centre of the square patch antenna. Deshmukh vpcoe, baramati, maharashtra, india abstract reconfigurable antenna is an alternative to multiband antenna. The suggested l slot excites the two orthogonal patch modes in phase quadrature for circular polarization without truncating any corner of the probe feed square patch. Frequency reconfigurable antenna for wlan and xband. Polarization reconfigurable microstrip patch antennas.
The patch mentioned yields horizontal polarizati on, as shown. Varactor diode loaded reconfigurable patch antenna with adjustable slots ritika tandon m. Deschamps in 1953, but didnt become practical until the 1970s when it was developed further by researchers such as robert e. Here, a novel geometry of dualband polarisation reconfigurable patch antenna is presented. In proposed work, circularly polarized slot cut circular microstrip antenna at 900 mhz is discussed. In this paper, a cpwfed circular polarization reconfigurable slot antenna is proposed. By controlling the phase shift of applied currents through these probes, the antenna can be set to excite either the sum or the. It consists of a square patch of side a printed on rt duroid substrate of. Polarization reconfigurable aperturefed patch antenna wei lin and hang wong department of electronic engineering and state key laboratory of millimeter waves hk. For example, an insulated slot in a patch, the addition of different slot shapes at the radiating element, such as the lshaped slot, a tshaped slot, an hshaped slot and the fractals slot have also been reported for large bands 59. This static reconfigurability distinguishes between reconfiguration time and run time. Design and development of reconfigurable compact cross patch antenna for switchable polarization 209 arms of the slot are tilted by along y. Vahldieck, a reconfigurable slot antenna with switchable polarization, ieee microwave and wireless components letters. Dual feed degenerate mode patch is used as the starting point for circular polarization and lshaped islands which can be connected or disconnected to the main patch via rf switches are placed around the patch.
First well need to understand polarization of plane waves, then well walk through the main types of antenna polarization. The conductor was fabricated on the three layers square substrate, whose width is g58mm, with a dielectric constant of 10, and substrate thickness of h11. Patch antenna with switchable slots pass for dualband operation. A wideband rectangular microstrip patch antenna with reconfigurable radiation patterns is proposed in this paper, which contains two symmetrically inverted u slots, and incorporates two coaxial probes along the resonant length of the patch. A square shape slot is loaded on the ground plane to excite circular polarization by creating a negative perturbation. The antenna is symmetrical along the yz plane and is excited by a proximity feed of width wf mm. Pin diodes are appropriately positioned to change the. U slot microstrip patch antennas were originally developed for bandwidth broadening applications.
Dynamic reconfigurability denotes the capability of a dynamically reconfigurable system that can dynamically change its behavior. When the switch is on the electrical size of antenna becomes small and it resonates at higher umts 2100 mhz band. Circularly polarized single feed microstrip patch antennas. Microstrip, multi frequency and u slot antennas, circular polarization, wideband system. The patch antenna with adjustable air gap discussed in part 1 is an example of a frequency reconfigurable antenna, which was the first problem we worked on. An lshape segment is integrated to the patch using a switching diode. Polarization reconfigurable microstrip patch antenna is presented for 2. Second, a polarization reconfigurable single feed eshaped patch antenna with wideband performance is proposed.
Introduction reconfigurability has become a crucial feature in m odern wireless communication world. The antenna radius was reduced by about 22% by of using slot lengths which are nearly equal to the diameter ofthe circular patch antenna. When the plate is driven as an antenna by a driving frequency, the slot radiates electromagnetic waves in a way similar to a dipole antenna. The basics of patch antennas, updated orban microwave. A quadpolarization and frequency reconfigurable square. Fabric substrate is used for the proposed antenna for manufactured and designed to steer the beam directions at the operation frequency of 7. Antenna reconfiguration is enabled with the aid of two rf switches inserted in appropriate locations on each slot of the eshaped patch. Introduction the basic geometry of the u slot antenna is shown in figure 1. This paper presents a dual band frequency and polarization reconfigurable microstrip antenna.
These slots typically have a directivity of 2 to 3 db compared. At the two rf ports an impedance transformer matches the 50. The methods developed for efficient wideband patch antenna design are based on one or more of the following principles. Slot antenna differs with patch antenna in many aspects. Ashish kumar sahu is a record of an original research work carried out by his during 20142015 under my supervision and guidance in partial fulfilment of the requirement for the. The circular polarized cp microstrip antenna msa is realized either by cutting narrow slot inside the coaxially fed msa or by using dual feeds in conjunction with the power divider network, or by cutting asymmetrical u slot or rectangular slot at an appropriate position inside the patch 1 11. The antenna has low profile with enhanced bandwidth and gain. Design of uslot patch antenna and its geometry the uslot patch antenna produces a wideband beam. A slot antenna consists of a metal surface, usually a flat plate, with one or more holes or slots cut out. The solution here proposed is based on the use of a. It is defined as ratio between minor and major axis of polarization ellipse. Circularly polarized cshaped slot patch antenna with reconfigurable polarization ameelia roseline arulandhusamy 1, deepa mayilvavahanan2 1professor,dept. Manikannan 1,2assistant professor, ck college of engineering and technology, cuddalore, tamil nadu abstract with the rapid advancement in wireless communication, reconfigurable antenna is gaining greater attention. P, india abstract reconfigurable microstrip patch antenna with a u slot is proposed for wearable fabric applications.
But in reconfigurable patch antenna using switchable lshaped slots for circuit polarization diversity there is no need of power divider and also multiple feeds. Polarization agile slotring array antenna using magict circuit. Fries,mischa grani and rudiger vahdieck, a reconfigurable slot antenna with switchable polarization, ieee microwave and wireless components letters, 11 nov 2003. Compact reconfigurable circularly polarised microstrip.
The slot use on the patch s surface affects the radiation characteristics of proposed antenna. For design the proposed antenna the u shaped slot and a. With the feature of easy reconstruction, liquid metal antennas attracted a growing number of scholars. What is the difference between slot antenna and patch antenna. Among these techniques, a u shaped slot will be used on the patch of the coaxially fed square patch antenna. Research article polarization reconfigurable patch antenna. When a wave is transmitted or received, it may be done in different. A broadband low crosspolarization uslot patch antenna array based on di. Polarization reconfigurable uslot patch antenna ieee.
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