On the use of slots in the design of patch antennas. When parasitic unit is connected to the main patch, the antenna operates in linear polarization mode. Fries,mischa grani and rudiger vahdieck, a reconfigurable slot antenna with switchable polarization, ieee microwave and wireless components letters, 11 nov 2003. Actually, slot antenna is a radiating element formed by a slot in a metallic surface. Two antenna prototypes with identical dimensions are designed, fabricated and measured. In 14, a microstrip fed annular slot is used for radiation.
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. Parasitic stubs can be connected or disconnected to the patch by changing the working status of. Survey on different types of reconfigurable patch antenna. Different lengths of uslot on the center of patch can excite two cp waves. This radiation pattern shows that the antenna radiates more power in a certain direction than another direction. Introduction reconfigurability has become a crucial feature in m odern wireless communication world. Polarization reconfigurable antenna design figure 1 shows the proposed structure and design parameters of the reconfigurable antenna. A reconfigurable circularly polarized microstrip antenna. The patch antenna is therefore a voltage radiator, as opposed to the wire antennas, which radiate because the currents add up in phase and are therefore. A quadpolarization and frequency reconfigurable square. Rfmems reconfigurable u slotted patch antennas for dual polarization. Patch antenna is actually a patch antenna placed over a antenna base. Survey on different types of reconfigurable patch antenna for. In a previous study, we proposed a polarization reconfigurable u slotted patch antenna that can switch between two orthogonal polarizations by means of cantilever switches loaded on portions of a slotted patch antenna 3.
Frequencyreconfigurable microstrip patch antennas with. In this paper, a novel single feed frequency and polarization reconfigurable microstrip patch antenna is presented. Different lengths of u slot on the center of patch can excite two cp waves or one linear polarization lp and one cp 6. Besides, radiation performance of the antenna also can be deteriorated. The simple design consists of two slots and two feeds. Abstract this letter presents a polarization reconfigurable memsintegrated coplanar patch antenna for mmwave applications. The designed antenna operates at the expected 60 ghz 5g frequency band with a central coaxial probe feed. A reconfigurable patch antenna consisting of a square patch with two crossshaped diagonal slots is presented. Polarization controlled microstrip antenna, ieee int. A novel polarization reconfigurable cut ring microstrip antenna with high gain is proposed. When a wave is transmitted or received, it may be done in different directions. Depending on which feed point is selected, either one of the linear. The sense of polarization can be easily changed from right handed to left handed by changing the feed position.
Varactor diode loaded reconfigurable patch antenna with adjustable slots ritika tandon m. Polarization reconfigurable uslot patch antenna ieee journals. Parasitic stubs can be connected or disconnected to the patch by changing the working status of the diodes 10. Patch antennas with controlled slots can also reach the aim of polarization recon. Introduction reconfigurable antenna is an emerging area of research as it. Vidmar, varactortuned microstrippatch antenna with frequency and polarisation. The horizontal radiation is obtained by the annular and radial slots. Polarization reconfigurable circular patch antenna with a c. Sng, reconfigurable patch antenna for polarization diversity, ieee transactions on antenna and propagation, 569,sept 2008. The basics of patch antennas, updated orban microwave. Polarization reconfigurable circular patch antenna with a cshaped slot is proposed in this communication. It can be linearly polarized or circularly polarized.
In this paper, a new pattern reconfigurable microstrip u slot patch antenna using eight pin diodes is proposed. In addition, the feasibility and effectiveness of this antenna were verified by the results of a simulation and experiment. Research article polarization reconfigurable patch antenna. Design of reconfigurable microstrip patch antenna for wlan. Study of frequency and polarization reconfigurable on square. All antennas in which frequency and radiation patterns can be modified in a reversible and controlled manner are known as reconfigurable antennas. The slot and patch parameters are numerically analyzed to achieve wide bandwidth along with symmetric radiation patterns. Rfmems reconfigurable uslotted patch antennas for dual. 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. 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. With a coaxial probe, two orthogonal resonant modes of the square patch antenna are simultaneously excited. Eight shorting posts are implemented around the patch to change the operating mode of the antenna from monopolar patch mode to normal patch mode. Frequency and polarization reconfigurable microstrip antenna. The slot antenna was invented in 1938 by alan blumlein, while working for emi.
A wideband rectangular microstrip patch antenna with reconfigurable radiation patterns is proposed in this paper, which contains two symmetrically inverted uslots, and incorporates two coaxial. The antenna is capable of switching its polarization from right hand circular polarization rhcp to left hand circular polarization lhcp and vice versa. Polarization reconfigurable uslot patch antenna abstract. Eshaped patch antenna with reconfigurable circular. To overcome these index terms eshaped patch antenna, microstrip antenna, pin diodes, polarization agile, reconfigurable antennas, rf switches.
What is the difference between slot antenna and patch antenna. Survey on different types of reconfigurable patch antenna for wireless applications 1k. A compact uslot microstrip patch antenna with reconfigurable polarization is proposed for wireless local area network wlan applications. Six radial slots are arranged at an interval of 60. Liang, polarization reconfigurable u slot patch antenna.
The lumped component can be used to alter antenna performances. Memsswitched u slotted patch antenna for dual polarization the geometry of the polarization reconfigurable antenna is shown in fig. This paper presents a dual band frequency and polarization reconfigurable microstrip antenna. Another example is the design of a microstrip uslot patch antenna that can.
A polarization reconfigurable patch antenna with electric current disturbance is proposed in this paper. Antenna reconfiguration is enabled with the aid of two rf switches inserted in. 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. The realized null depth in the difference mode is well below 30 db, which makes the proposed antenna well suited for monopulse radar applications. Polarization reconfigurable circular patch antenna with a. A compact u slot microstrip patch antenna with reconfigurable polarization is proposed for wireless local area network wlan applications. Polarization reconfigurable microstrip patch antenna is presented for 2. Abstract a varactor diode is placed on every slot to alter the current direction, which determines the polarization state. Polarization reconfigurable capability has been successfully added to a conventional eshaped patch antenna. A polarization reconfigurable, compactsized, lowprofile circularly polarized, omnidirectional antenna has been designed. Two pin diodes are loaded in the slots to produce two different frequency bands. The antenna consists of two symmetric slots that are fed by a forkshaped microstrip line.
The microstrip antenna s radiation arises from the fringing fields, which are due to the advantageous voltage distribution. Vahldieck, a reconfigurable slot antenna with switchable polarization, ieee microwave and wireless components letters. This antenna can be used in emerging reconfigurable wireless communication systems. Compact size, patch antenna, polarization reconfigurable, pin diodes. The polarization of the field radiated by this reconfigurable antenna can be configured into righthanded circular polarization rhcp, lefthanded circular polarization lhcp or linear polarization lp. A polarizationreconfigurable high gain microstrip antenna. In addition, the two modes are designed to resonate in similar frequency ranges. The type of antenna polarization decides the pattern of the beam and polarization at the reception or transmission. A simple design of circularlypolarized cp microstrip antennas with frequency agility is described. New radiation patternreconfigurable 60ghz antenna for 5g. For reconfigurable antennas, the potential is not to increase the performance of the antenna in a. Because the cp sense of the proposed antenna is altered by the current path that is redirected with switched pin diodes on the slots.
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. Polarization reconfigurable patch antenna for wireless. Geometry of a reconfigurable polarization patch antenna with loop slot on the ground. Study of frequency and polarization reconfigurable on square patch antenna 147. Study of frequency and polarization reconfigurable on. May 25, 2019 slot antenna differs with patch antenna in many aspects. Polarization reconfigurable patch antenna for wireless sensor. Circularly polarized microstrip patch antenna for wireless. Antenna theory beam and polarization tutorialspoint. A reconfigurable antenna is an antenna capable of modifying its frequency and radiation properties dynamically, in a controlled and reversible manner. Pin diodes are appropriately positioned to change the length of the u slot arms, which alters the antenna s polarization state. Polarization reconfigurable patch with perturbations on the patch the structure of the reconfigurable four polarization antenna with the perturbations on the patch and its geometrical parameters are plotted in figure 7. The antenna is composed of two meandered monopoles perpendicular to each other, a switchable feeding network and a metallic reflector.
A polarizationreconfigurable rectangular patch antenna for bandwidth enhancement is proposed. The current on the strip perturbed square ring slot antenna with reconfigurable polarization and the ground mainly. Generally, circular polarization cp operations are preferred in most applications. Pin diodes are appropriately positioned to change the. Pdf polarization reconfigurable uslot patch antenna. A polarization reconfigurable patch antenna with loop slots on the. Measured radiation patterns of the reconfigurable patch antenna. Reconfigurable patch antennas with fourpolarization. By varying the capacitor value, the frequency is tuned and resonating upto 2. In, antenna s polarization state is altered by positioning the pin diodes appropriately to change the length of the uslot arms, the final 3 db axial ratio bandwidth is greater than 2. It allows switching between right hand circular polarization rhcp and left hand circular polarization lhcp. Tm stands for a magnetic field distribution between patch and ground that is transverse to the zaxis of the antenna shown in figure 1. Polarization reconfigurable memscpw antenna for mm. The proposed antenna has four lshaped slots on the ground plane, and the cp radiation can be generated by current perturbation due to the slotted ground plane.
Polarization reconfigurable aperturefed patch antenna wei lin and hang wong department of electronic engineering and state key laboratory of millimeter waves hk, city university of hong kong tat chee avenue, kowloon, hong kong, email. Kishk published a paper on frequency reconfigurable u slot patch antenna. The solution here proposed is based on the use of a. A polarization and radiation pattern reconfigurable antenna for different applications was presented by zixian et al. This simple structure microstrip antenna consists of a ring radiation patch, two switches pin diodes. A compact uslot microstrip patch antenna with reconfigurable polarization is. This transverse with respect to the zaxis is usually dropped because the magnetic fields in patch antennas are always transverse to their zaxis.
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. Tejbir singh assistant professor, subharti university, meerut, u. The design of a circular polarization cp reconfigurable monopole antenna with enhanced boresight gain for the global navigation satellite system gnss is presented. Radiation pattern the patchs radiation at the fringing fields results in a certain far field radiation pattern. Sep 01, 20 a square slot antenna can change between two linear polarization lp states by controlling the feed structure 4. The two feeds are positioned on the right and left diagonal of microstrip antenna.
The circular polarization has been obtained by the combination of vertical polarization by microstrip patch along with cshaped slot and horizontal polarization by. A reconfigurable patch antenna using switchable slotted structure for polarization diversity abstract. Circular polarization reconfigurable wideband eshaped. Details of the simulated and measured reflection coefficient, axial ratio, gain and. Typical half wave patches have efficiencies well above 90%. A polarization reconfigurable patch antenna with loop slots on the ground plane ieee antennas and wireless propagation letters 2012 11 69 72 2s2. Wideband radiation reconfigurable microstrip patch antenna loaded with two inverted u slots abstract.
A circularpolarization reconfigurable meng shaped patch. They are different from other antennas, as their mechanism of reconfiguration is located within the antenna and not controlled by an external beam. For example, when the component is a capacitor, the operation frequency of the slot antenna can be decreased with increasing the capacitance value 1. Multiband and multiparameter reconfigurable slotted. The radiation pattern is not disturbed by switch state and gain of proposed antenna is above 5 dbi. It is demonstrated that by introducing a reconfigurable cshaped slot in a circular patch antenna, the polarization of the radiation of the antenna, operating either in a linearly or circularly polarized mode, can be switched effectively. 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. Vahldieck, a reconfigurable slot antenna with switchable polarization, ieee microwave and wireless components letters, vol. This letter describes a square patch antenna with a switchable circular polarization cp sense. The novel geometry composed of a chinese character meng. An arcshaped slot with two pin diodes is embedded in the circular patch. Circular polarization wideband eshaped patch antenna for. In this paper, we introduce a reconfigurable artistic patch antenna with unidirectional circular polarization cp radiation.
A wideband slot antenna with frequency and pattern reconfigurable characteristics for tdlte 3. Perturbed square ring slot antenna with reconfigurable. 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. An antenna can be polarized depending upon our requirement. Reconfigurable beam steering using circular disc microstrip patch antenna with a ring slot is proposed. Polarization reconfigurable uslot patch antenna ieee. Polarization reconfigurable u slot patch antenna abstract. A quadpolarization and frequency reconfigurable square ring. Pin diodes are appropriately positioned to change the length of the uslot arms, which alters the antennas polarization state. Bandwidth enhancement of a polarizationreconfigurable patch. A new polarizationreconfigurable antenna for 5g applications.
The reconfigurable antenna is composed of a square radiating patch, four varactor diodes, and two lumped capacitors. Reference 5 proposed a reconfigurable perturbed square slot antenna that could operate at lefthand cp lhcp, right hand cp rhcp, or lp. Its structure is simple and consists of a singlelayer singlefeed eshaped patch and two rf switches placed at appropriate locations in the slots. A polarization switchable microstrip patch antenna with a. Introduction recently, a polarization reconfigurable antenna, which can offer various polarizations at the same operating. The proposed design approach is based on the use of two pairs of switches in order to obtain both frequency and polarization reconfigurability. Radiation patterns of the reconfigurable antenna fed from port 1 are. In this paper, a novel design of an octagonal shape micro strip patch antenna with switchable slots pass structure is proposed to achieve polarization diversity. 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. Dual sense cp is obtained because of four unequal linear slots which augment the slot. Two orthogonal slots are incorporated into the patch and two pin diodes are.
If the antenna had a 100% radiation efficiency, all directivity would be converted to gain. 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. When the switch is on the electrical size of antenna becomes small and it resonates at higher umts 2100 mhz band. This antenna mainly comprises of a corner truncated square patch with a rectangular ring slot, eight pin diodes and six conductive pads. Reconfigurable patch antennas with fourpolarization states. 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. Polarization reconfigurable dualband rectangular slot antenna in. A wideband rectangular microstrip patch antenna with reconfigurable radiation patterns is proposed in this paper, which contains two symmetrically inverted u slots.
Reconfigurable antennas for wireless communications. The parameter of the antenna are l1w, l2w232, l3w340, l4w4100mm, g2mm. When the equivalent capacitance values of the varactors are increased. Research article polarization reconfigurable patch antenna for wireless sensor. A reconfigurable patch antenna using switchable slotted. At the two rf ports an impedance transformer matches the 50. Design of frequency and patternreconfigurable wideband. Keywords reconfigurable microstrip patch antenna, slots, swi tches, dual band, resonant frequency. Wideband radiation reconfigurable microstrip patch antenna.
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