Singlefeed superstrate loaded circularly polarized. In this paper, a low cross polarization improvedgain rectangular patch antenna is presented. Sarwar hosain 2, sohag sarker 2, makhluk hossain prio 3, monir morshed 4, ajay krishno sarkar 3. Moreover, used in an fpc antenna, the proposed superstrate converts a linear polarization produced by a patch antenna into a circular polarization. A method to enhance gain of a circularly polarized cp microstrip patch antenna is proposed. The patch mentioned yields horizontal polarizati on, as shown. A transmit antenna needs a receiving antenna with the same polarization for optimum operation. Conclusion with the use of a periodic structure superstrate, a wideband and high gain cpmpa was designed. The basics of patch antennas, updated orban microwave. Gain enhancement of microstrip patch antenna using dielectric. By optimizing the patch and the slot dimensions, a high efficiency 90% microstrip fed cp antenna with an impedance bandwidth of 24% and a 6. The wide beamwidth is achieved by introducing a substrate larger than the ground and an annular dielectric superstrate with a metal ring. This polarization can be either vertical or horizontal depending on the orientation of the patch. Figure 5 depicts the simulated gain of the proposed patch antenna.
The simulated results show explicitly that the proposed antenna can achieve obvious rcs reduction in. Improved microstrip antenna with his elements and fss. Study of the dielectric superstrate thickness effects on. A high reflective frequency selective surface hrfss superstrate is designed and placed over the proposed antenna at an optimized position to intensify the gain. Each radiator behaves like a pair of radiating slots in the patch antenna as shown in figure 5. Directivity enhancement of circular polarized patch. It is important to match the polarization of the rf antenna to that of the incoming signal. The effect of changing substrate material and thickness on the performance of inset feed microstrip patch antenna. The effects of the substrate, superstrate and ring on radiation pattern and circular polarization are discussed.
The antenna1 consisting of four slits introduced at the boundary of radiating square patch with a cross slot in the centre. We etch coupled squareshaped split ring resonators csssrrs on both sides of a superstrate which is. The language of a later, invading people imposed on and leaving features in an indigenous language. Directivity enhancement of circular polarized patch antenna using ring. The equation 1 can be applied for designing a hexagonal microstrip patch antenna by relating the areas of the circular and hexagonal patches as shown in equation 3. Circular polarization is generated by truncating two opposite edges from a. The design of a circularly polarized cp microstrip antenna with wide beamwidth working at 1.
We etch coupled squareshaped split ring resonators csssrrs on both sides of. Polarization analysis for an xband microstrip patch antenna open live script in its most basic form, a microstrip patch antenna consists of a radiating patch on one side of a dielectric substrate and a ground plane on the other side. Size reduction of an antenna was investigated vastly in publications 2,3. Ultraminiature circularly polarized cpwfed implantable. Feed one signal to the horizontal radiator x axis and the other to the vertical radiator y axis. For patch type fss superstrate varying air gap thicknesses, beam scans from broadside to 45 and further. Wonkyu choi 5 presents the high gain patch array antenna using the superstrate layer where the layer affects its gain and resonant characteristics. Rhcp and lhcp left and right hand circular polarizations are described. Pdf metamaterial superstrate antenna design with gain. Introduction this article introduces the basic concepts of patch antennas.
International journal of electronics and computer science. Introduction a microstrip antenna consists of a radiating patch on one side of a dielectric substrate, which has a ground plane on the other side. Additionally, an equivalent circuit model for mpa and designed rca is developed. Circular polarization is generated by truncating two opposite edges from a circular patch antenna at 45 to the. This paper outlines a new polarization reconfigurable ebg electromagnetic band gap antenna in the 60 ghz millimeter waves band. The fundamentals of patch antenna design and performance. I really understand this better now, but i have 1 more question. Linear polarization horizontal or vertical pole is discussed. In general, the distance space between the antenna and the superstrate is approximately onehalf wavelength, where, where is the difference between adjacent resonant frequencies. The final designed antenna is fabricated and the measurement results agree well with the simulation results. A wideband circularly polarized patch antenna for 60 ghz. Size reduction of microstrip patch antenna by using meta. The simulated monostatic rcs as a function of frequency for the patch antenna with and without the superstrate is given in fig. Antennas using patches as constitutive elements in an array are also possible.
Simulated eplane and hplane co and cross polarization radiation patterns for proposed patch antenna with ebg superstrate at a 25, b 28, c 38ghz. Aug, 2016 the paper presents three single fed circularly polarized square patch antenna structures for wireless communication applications. In this communication, an asymmetr asymmetric chiral metamaterial superstrate for patch antenna polarization transformation ieee conference publication. Kumarswamy published on 20928 download full article with reference data and citations. Dielectric superstrate thickness variationon the characteristics of circular patch antenna written by v. The most common type of microstrip antenna is the patch antenna.
A patchground shorting pin with defected patch structure dps is introduced to suppress the cross polarization level. Axialratio bandwidth and gain enhancements of patch antenna. Many techniques have been used to reduce antenna size, among these techniques is slotting the patch of antenna 4, using shorting posts 5, and using. Planar superstrates constituted by chiral metamaterials structures can transform the radiation properties of an antenna. Here two different types of antenna have been made, one is 2 x 8 antenna array with superstrate and 4x8 antenna array without superstrate. In order to obtain hemispherical radiation pattern for airborne applications, the conventional patch antenna is coverd by a superstrate with dielectric constant of 2. Here the antenna is often mounted in a vehicle, where the angle in the xy plane relative to the satellite is not fixed like it is for the satellite television dish mounted to your house. The main objective of this work is to enhance the gain and directivity of the metamaterial microstrip patch antenna used for wireless point to point communication applications like dedicated short range communications dsrc. To excite circular polarization in a patch we need to do three things.
Patch array antenna with high gain using ebg superstrate for. The antenna described here is a probefed square microstrip patch antenna covered by a dome shaped superstrate designed to operate at a frequency of 1. Circular polarization in the antenna is achieved by etching out the 2 corners of the square radiating patch, as illustrated in figure 5a. Hence, this antenna is radiating in right hand circular polarization for both plane.
The antenna 1 consisting of four slits introduced at the boundary of radiating square patch with a cross slot in the centre. When circular patch microstrip antenna with the dielectric superstrate or radom is shown in figure 3. Singlefeed circularly polarized microstrip antenna loaded. Investigations on wideband uslot microstrip patch antenna. The microstrip patch antenna using a dielectric superstrate for having high gain and wide bandwidth, includes. Thus circular polarization is employed for satellite radio, and the angle that the patch is with respect to the satellite doesnt matter. The characteristics of antenna parameters change as a function of the dielectric superstrate layer. Gain enhancement of microstrip patch antenna using dielectric dng superstrate by abdulbaset m. In this research, the his structure was introduced to suppress the surface wave of the microstrip antenna whereby the his elements were mounted around the radiating patch of the antenna. A patch antenna is a narrowband, widebeam antenna fabricated by etching the antenna element pattern in metal trace bonded to an insulating dielectric substrate, such as a printed circuit board, with a continuous metal layer bonded to. A wideband circularly polarized patch antenna for 60 ghz wireless communications 99. Circular or linear polarized antenna for fpv oscar liang.
A novel wide beamwidth and circularly polarized microstrip. Design of microstrip patch antenna with superstrate for. Asymmetric chiral metamaterial superstrate for patch antenna. The phase change of the wave propagation from the antenna to the superstrate layer can be determined by. In this cra a circular patch antenna is used as a feeding source. The paper presents three single fed circularly polarized square patch antenna structures for wireless communication applications. The circular patch type fss possesses some unique properties favorable for thin superstrate sizes. P, india abstract here we made an attempt to maximize the gain of microstrip patch antenna.
Patch array antenna with high gain using ebg superstrate. The spectral domain approach using two entire basis functions, respectively corresponding to electric currents flowing on the patch surface of two degenerate modes, is extended to study the resonant frequencies of two degenerate modes, the circular polarization condition and the input impedance of a circularly polarized rectangular patch. Axialratio bandwidth and gain enhancements of patch antenna using single dielectric superstrate. Circularly polarized microstrip antenna marwa shakeeb a thesis in the department of electrical and computer engineering. Pdf axialratio bandwidth and gain enhancements of patch. Spectral domain analysis of circularly polarized rectangular. Superstrate definition of superstrate by the free dictionary. The metamaterial superstrate antenna plays a major role for improving the gain of the antenna. Circular polarization cp is realized by introducing a diagonal slot at the center of the square patch. The detailed parameters of the antenna structure and packaging are listed in.
We use a simple rectangular, half wave long, probefed patch operating in its fundamental mode as an example. Jun 03, 2015 in order to design a microstrip patch antenna at first the designer is to select the substrate material and its thickness. The polarization or polarisation of electromagnetic em waves or fields is introduced. Introduction a microstrip antenna consists of a radiating patch on one side of a dielectric substrate.
In the above expression, a is the actual radius of the circular patch antenna as shown in figure 1, whereas h is the height of the substrate. In addition, the resulting distance between the antenna and the superstrate was h 0. The present invention provides a microstrip patch antenna and array antenna using dielectric superstrate in order to enhance the antenna gain by stacking radiating patches and dielectric layers. Chung 2, prayoot akkaraekthalin 1 1 electrical engineering, king mongkuts university of technology north bangkok 1518 pibulsongkram rd. Us6946995b2 microstrip patch antenna and array antenna. The effect of changing substrate material and thickness on. Polarization analysis for an xband microstrip patch antenna.
This leads into the discussion of antenna polarization. Also from figure 5b, it can be seen that the superstrate is exactly placed above the radiating patch of the designed miniaturized antenna. Loading the rectangular slot into the patchground shorted rectangular patch antenna is an effective way to suppress the crosspolarization level of a rectangular patchbased antenna. A patch antenna is a narrowband, widebeam antenna fabricated by etching the antenna element pattern in metal trace bonded to an insulating dielectric substrate, such as a printed circuit board, with a continuous metal layer bonded to the opposite side. So, if the designer has a clear conception about the effect of changing substrate material and its thickness on the performance of the antenna, it will be easier to design an antenna. Very good broadside radiation patterns are observed and the cross polarization in the principal planes is seen to be less than 20 db. Low crosspolarization improvedgain rectangular patch antenna. Design of high gain, wideband microstrip resonant cavity.
The proposed hybrid antenna is composed of a multilayer pyramidal dra dielectric resonator antenna exciting source covered with a fss frequency selective surface superstrate. The total transmission matrix is thus where and where. A square patch microstrip antenna, designed patch widthw 33. In addition, the cavity antenna produces lefthand circular polarization and righthand circular polarization when a patch antenna inside the cavity generates. In the figure, the rhcp plot is greater than lhcp at the broadside direction. Gain enhancement of microstrip patch antenna using. Analysis and design of circular microstrip patch antenna at 5. Rectangular patch antenna, circular patch antenna, square patch antenna, dielectric superstrate radome, resonate frequency, gain etc. The antenna consists of a corner cut square radiating patch in which 4 arrow type slots are etched out, a superstrate placed exactly above the radiating patch and a coaxial feed. This paper presents the design of a fully packaged 60 ghz wideband patch antenna incorporating an air cavity and a fused silica superstrate.
The proposed antenna exhibits high gain and low cross polarization level making it a good candidate for radar applications. The device can switch between circular and linear polarization. The paper presents a coplanar waveguide cpwfed ultraminiaturized patch antenna operating in industrial, scientific and medical ism band 2. A new design method for patch antenna with low rcs and. Asymmetric chiral metamaterial superstrate for patch. Gain enhancement for circularly polarized microstrip patch.
In practice when the excitation source of the cra is a probefed microstrip antenna with finite ground plane, substrate and superstrate, cross polarization increases. Design of slotted ground hexagonal microstrip patch. A miniaturized circularly polarized coaxial fed superstrate. Ali a thesis submitted in partial fulfillment of the requirements for the degree of master of science in electrical engineering approved by. A miniaturized circularly polarized superstrate antenna is presented in this letter. A superstrateintegrated lowcrosspolarization antenna is presented.
1002 209 995 295 443 1084 164 1137 902 1485 899 612 779 125 757 1126 143 1088 1426 991 651 135 1469 125 1402 73 91 40 1255 305 486 18 683 474 1119 228 1372 258