For example, when the component is a capacitor, the operation frequency of the slot antenna can be decreased with increasing the capacitance value 1. An u sha 2 1,associate professor, 2 assitant professor department of electronics and communication engineering, kumaraguru college of technology,coimbatore, india. Although frequency reconfigurability and multiband operation are provided by these antennas, still critical limitations in terms of antenna gain, size. The type of antenna polarization decides the pattern of the beam and polarization at the reception or transmission. A polarizationreconfigurable high gain microstrip antenna. A compact uslot microstrip patch antenna with reconfigurable polarization is proposed for wireless local area network wlan applications.
Polarization reconfigurable patch antenna for wireless. Tarricone department of innovation engineering university of salento via monteroni, lecce 73100, italy abstracta recon. Polarization reconfigurable twolayer stacked patch antenna design for wifi. A single probefed reconfigurable circularly polarized microstrip patch antenna with a circular slot is proposed.
Request pdf frequency reconfigurable uslot microstrip patch antenna a. A quadpolarization and frequency reconfigurable square ring. A transmit antenna needs a receiving antenna with the same polarization for optimum operation. Polarization controlled microstrip antenna, ieee int.
A dualfrequency microstrip patch antennas has been presented and used for 802. Alternate feed methods a common variation in patch antenna design is the location. A multiband frequency and pattern reconfigurable antenna for wifiwimax and wlan. A circularpolarization reconfigurable mengshaped patch antenna. Antenna theory beam and polarization tutorialspoint. Reconfigurable notch band monopole slot antenna for wlan. A polarization reconfigurable patch antenna with loop. Patch antenna is actually a patch antenna placed over a antenna base. All the three designs 68 are based on similar foursectional me. Consequently, the proposed antenna can be made small size and compact compared with a linearly polarized patch antenna with a single slot.
Pdf polarization reconfigurable uslot patch antenna. 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. The antenna consists of a monopole circular patch with radius and feedline length printed on a taconic substrate with relative permittivity of 4. Vahldieck, a reconfigurable slot antenna with switchable polarization, ieee microwave and wireless components letters, vol. A dualband polarization reconfigurable antenna for wlan systems. This simple structure microstrip antenna consists of a ring radiation patch, two switches pin diodes. Antenna reconfiguration is enabled with the aid of two rf switches inserted in. The effective overlapped bandwidth is 16% covering 5.
A polarization switchable microstrip patch antenna with a. Antenna consists of circular patch with u slot at the center and two pin diodes to make it as reconfigurable and dielectric substrate of permittivity 4. A circularly polarized smallsize microstrip antenna using. Design of a dualband frequency reconfigurable patch antenna. Slot antennas are used typically at frequencies between 300 mhz and 24 ghz. Design of double uslot patch antenna a low profile double uslots antenna for wimax operation has low return loss and bandwidth. Ieee websites place cookies on your device to give you the best user experience. Polarization reconfigurable uslot patch antenna ieee. Circular polarization reconfigurable antennas have drawn lots of attention in recent years, since they have both the merits of circular polarization antenna capable of mitigating the multipath effect and flexibility in the orientation of the transmitting and receiving antennas, and reconfigurable antenna satisfy the requirements for increased functionality within a. The basic monopole slot antenna providing notch band from 2. An u sha 2 1,associate professor, 2 assitant professor.
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. The current distribution of an eshaped patch antenna in state 3 is shown in fig. Circular polarized antennas will increase your wireless network performance in busy and crowded envirnments where standard vertical and horizontal polarization is not working. Study of frequency and polarization reconfigurable on square. Reconfigurable microstrip patch antenna with switchable plarization, etri tournal, 283, june 2006. Pin diodes are appropriately positioned to change the.
In order to obtain polarization reconfigurability, several patch antenna configurations have been investigated 57. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. Reconfigurable monopole antenna with notch filter for uwb. Linear polarization horizontal or vertical pole is discussed. Basic geometry and basic characteristics of patch antennas 3. A novel polarization reconfigurable cut ring microstrip antenna with high gain is proposed. Fries,mischa grani and rudiger vahdieck, a reconfigurable slot antenna with switchable. This antenna is often built of printed circuit board material. Opposite corners have been slotted on each patch, and a diode on each slot is used for. A patch antenna is a type of radio antenna with a low profile, which can be mounted on a flat surface. A compact u slot microstrip patch antenna with reconfigurable polarization is proposed for wireless local area network wlan applications. It can be linearly polarized or circularly polarized. An antenna can be polarized depending upon our requirement.
Polarization reconfigurable microstrip patch antenna is presented for 2. This antenna is often built of printed circuit board material and the substrate makes up the patch antennas dielectric. Pin diodes are appropriately positioned to change the length of the u slot arms, which alters the antennas polarization state. The antenna tuning is realized by changing its effective electrical length, which is controlled by the bias voltages of the solid state shunt switches along the slot antenna.
A quadpolarization and frequency reconfigurable square. Blekinge institute of technology bth karlskrona, sweden september 20 supervisor. Introduction antenna spreads out a radio frequency rf signal generated in transmitter through space and gets it back at receiver. Study of frequency and polarization reconfigurable on. This leads into the discussion of antenna polarization. Cp was obtained by loading the square slot with a tshaped strip and two microstrip tjunctions. Compact size, patch antenna, polarization reconfigurable, pin diodes. It allows switching between right hand circular polarization rhcp and left hand.
A twolayer stacked microstrip patch antenna designed for 2. Connected uslots patch antenna for wimax applications. Reconfigurable antennas for wireless communications. The experimental models are madeof fr4 epoxy substrate. A dualband circularlypolarized patch antenna with a novel. The antennas had been designed, simulated and parametricall. The basics of patch antennas, updated orban microwave. The polarization or polarisation of electromagnetic em waves or fields is introduced. Polarization reconfigurable antenna, circular patch, slit perturbations. A multiband reconfigurable slot antenna for wireless. The proposed antenna is suited for the wimax and wifi application. This polarization can be either vertical or horizontal depending on the orientation of the patch. Design of a compact ultrawideband ushaped slot etched on.
Design of reconfigurable slot antennas ieee journals. Introduction reconfigurable antenna is an emerging area of research as it helps in increasing the. The wideband planar reconfigurable polarization antenna array is assigned to the united states government and is available for licensing for commercial purposes. This resulted in an axial ratio bandwidth of about 19. May 25, 2019 slot antenna differs with patch antenna in many aspects. 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. An antenna array includes a plurality of subarrays each having a plurality of linearly polarized antenna elements, with each antenna element having an orthogonal feed orientation with respect to its adjacent antenna elements, and at least two feed lines each connected by at least one subfeed line to at least two antenna elements having orthogonal feed orientations such that each antenna. The proposed antenna was designed and tested to verify circularly polarizing operation. A compact eshaped antenna with cshaped slots and a back. A circularly polarized smallsize microstrip antenna using a. A frequency reconfigurable patch antenna design based on the.
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. Actually, slot antenna is a radiating element formed by a slot in a metallic surface. Wideband radiation reconfigurable microstrip patch antenna. Fries,mischa grani and rudiger vahdieck, a reconfigurable slot antenna with switchable polarization, ieee microwave and wireless components letters, 11 nov 2003. Accordingly it is expected that a wideband polarization recon. Reconfigurable magnetoelectric dipole antennas for base. Vidmar, varactortuned microstrippatch antenna with frequency and polarisation. What is the difference between slot antenna and patch.
A reconfigurable slot antenna with switchable polarization. Frequency reconfigurable uslot microstrip patch antenna. An electronically reconfigurable patch antenna design for. Polarization reconfigurable capability has been successfully added to a conventional eshaped patch antenna. On the use of slots in the design of patch antennas. Loop resonator slot for improved bandwidth performance in wifi applications. To this end, reconfigurable cp antennas have been reported extensively in the literature, using variety of structures such as crossed dipole 2,3, patch 4 5678, radiating arms 9 and. Microstrip patch antennas or simply patch antenna are increasingly useful because the antenna is printed directly onto a circuit board. The fundamentals of patch antenna design and performance. Among these techniques, a u shaped slot will be used on the patch of the coaxially fed square patch antenna. The antenna consists of a monopole circular patch with radius and feedline length printed on a taconic substrate. Slot antenna differs with patch antenna in many aspects. The patch mentioned yields horizontal polarizati on.
Additional benefits of patch antennas is that they are easily. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. A new microstrip dualband polarization reconfigurable antenna is presented for wireless local. Azaro r, fimognari l, massa a 2007 a planar electronically reconfigurable wi fi. 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. As one right left side point of the circular slot is shorted between the inside of the slot and.
It allows switching between right hand circular polarization rhcp and left hand circular polarization lhcp. Reconfigurable antennas synthesis lectures on antennas. As a result, the lp antenna will have a polarization mismatch loss of 0. Polarization reconfigurable pattern reconfigurable. The broadband characteristic of a microstrip patch antenna with ushaped slot has been confirmed by many published results 24. Although the design is based on a resonant configuration, an effective bandwidth of 1. In this paper, we introduce a reconfigurable artistic patch antenna with unidirectional circularpolarization cp radiation. Also, several designs of broadband slots antenna have been reported 5. What is the difference between slot antenna and patch antenna. 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. At the two rf ports an impedance transformer matches the 50. It consists of a flat rectangular sheet or patch of metal, mounted over a larger sheet of metal called a. A dualband circularlypolarized patch antenna with a. Another example is the design of a microstrip uslot patch antenna that can.
An electrical model to uslot patch antenna with circular. The lumped component can be used to alter antenna performances. The distance between the patch and the ground plane the. First a modified triangle shaped antenna with partial ground plane is designed as illustrated in configuration antenna a of fig. Design layout for uslot patch antenna a front view. 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. Reconfigurable antenna technology frequency reconfigurable antennas are implemented utilizing pin. In this section, we present three polarization reconfigurable me dipole antennas. Emi, patch antenna, dgs, reconfigurable antenna, pin diode 1. Electric surface current distribution on the eshaped patch antenna in state 3 during one time cycle.
A circularpolarization reconfigurable meng shaped patch. The evolution step of the proposed antenna is illustrated in fig. Eshaped patch antenna with reconfigurable circular. 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. The measured antenna gain maintains stability at approximately 8. This article is brought to you for free and open access by the electrical. It consists of a square patch of side a printed on rt duroid substrate of. The patch mentioned yields horizontal polarizati on, as shown. Reconfigurable radial line slot array rlsa antenna for beam shape. My intention for posting just pictures with dimensions is for. A slot is etched on the ground plane of the antenna, where two varactor diodes are. Polarization reconfigurable twolayer stacked patch antenna. In a frequency reconfigurable triband antenna fed with a coplanar waveguide is proposed where the antenna elements are arranged in orthogonal alignment using polarization diversity technique.
When a wave is transmitted or received, it may be done in different directions. Geometry of the polarization reconfigurable me dipole antenna 8. Reconfigurable antennas frequency reconfigurable antennas polarisation. A frequency reconfigurable antenna with triple linear polarization and wide. The polarization loss factor is sometimes referred to as polarization efficiency, antenna mismatch factor, or antenna receiving factor. Antenna consists of circular patch with uslot at the center and two pin diodes to make it as reconfigurable and dielectric substrate of permittivity 4. Introduction reconfigurable antenna is an emerging area of research as it helps in increasing the system capacity and realizing multiple functions. In 68, variations of the u slot were introduced as a new technique to achieve cp, besides. Reconfigurable patch antennas have drawn a lot of research interest for future. The slot antenna is popular because they can be cut out of whatever surface they are to be mounted on, and have. I built this slot antenna several years ago and have used it with very good results in illuminating a parabolic dish for 2. Design and analysis of compact u slot microstrip patch.
Therefore, lhcp could be generated at the resonant frequency. Figure 1 shows the dimensions and geometry of the designed antenna. Two antenna prototypes with identical dimensions are designed, fabricated and measured. Designing of reconfigurable multiband antenna for wlan.
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