At fu,the antenna can also support a righthand circular polarization rhcp with a good axial ratio to support a satellite communication system. Resonant frequency of an antennain general any device is where it performs at a highest level. The top metallic flat region, which is called the patch antenna, sits on a dielectric substrate. This radiation pattern shows that the antenna radiates more power in a certain direction than another direction.
Having a 125 degree input range with this patch antenna would suffice for a gps. Antennas using patches as constitutive elements in an array are also possible. A single patch antenna provides a maximum directive gain of around 69 dbi. If the ratio lw is close to unity, the radiation pattern will be symmetric but may not provide a resonable input impedance. Sonia goyal2 1, 2department of electronics and communication engineering punjabi university patiala, india abstract. The waves from the patch start getting radiated from the width side. 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 patch may be in a variety of shapes, but rectangular and circular are the most common. Radiation properties include power flux density, radiation intensity, field strength. Figure 3 a patch may be fed at two points along adjacent edges. A microstrip or patch antenna is a lowprofile antenna that has a number of advantages over other antennas. In this paper, the radiation pattern on either side of the main beam, which is created by a standard microstrip patch antenna, is configured to correspond to a cosecantsquared curve. Microstrip patch antenna have been analyzed and studied. The geometrical structure under consideration of circular patch antenna prototype and superstrate material is shown in figure 6, figure 7, figure 8, figure 9. A reconfigurable stacked microstrip patch antenna for. The patch is generally made up of a conducting material such as copper or gold and can take any possible shape like rectangular, circular, triangular, elliptical or some other common shape. Analysis and design of circular microstrip patch antenna at 5. 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 of the substrate which forms a ground plane. Pdf microstrip patch antenna is widely used in aircraft, spacecraft and other application for small size, low cost and light weight. Introduction to microstrip antennas university of houston. When the antenna is excited, the waves generated within the dielectric undergo reflections and the energyis radiated from the edges of the metal patch,which is very low.
Figure 4 measured pattern of a patch antenna, with a typical beamwidth of 65. This rectangular microstrip patch antenna is designed for wireless communication application that works at 2. Pattern analysis of the rectangular microstrip patch antenna. It usually consists of a metal patch on top of a grounded dielectric substrate. Antdevco employees have designed andmanufactured spacecraft microstrip patch antennas for many small spacecraft programs. The antenna is attractive due to its lowprofile conformal design, relatively low cost and very narrow bandwidth. Microstrip patch antennas for broadband indoor wireless. In 5 a pattern and frequency reconfigurable antenna offers two different radiation patterns, steered by two switching elements. Siddaiah procedia computer science 85 2016 401 a 409 dirctivity. The microstrip patch antenna calculator determines the length l and width w of a rectangular microstrip patch antenna for a given resonant frequency or vice versa.
The microstrip antenna is designed so its radiation pattern maximum is perpendicular to the patch and in the rectangular patch antenna, the length l of the rectangular patch should be with in. Microstrip patch antenna array design to improve better. The goal is to match the input impedance zin to the transmission line z0. Patch antenna with a quarterwavelength matching section. The microstrip patch antenna is used in a wide range of applications because it is easy to design and fabricate.
Microstrip patch antenna array design to improve better gains. In that vein, innovators from singapore have developed a taperedslit cp patch antenna with a compact rectifier for energyharvesting purposes. These antennas are capable of supporting high data rates to at least 10 watts of transmittedpower. Design and analysis of microstrip patch antenna arrays. The em waves fringe off the top patch into the substrate, reflecting off the ground plane and radiates out into the air. Design and simulation of microstrip phase array antenna. The thickness of the ground plane or of the microstrip is not critically important. I want to know formula for radiation pattern e field and h filed of rectangular microstrip antenna for finite ground plan. The radiation pattern of a microstrip or patch antenna is shown above. Properties not specified retain their default values. Microstrip patch antennas have become the favorite of antenna designers because of its versatility and advantages of planar profile, ease of fabrication, compatibility with integrated circuit technology, and conformability with a shaped surface. A microstrip patch antenna is a radiating patch on one side of a dielectric substrate, which has a ground plane on the underside 1, pg2.
The directivity of patch antennas is approximately 57 db. Deschamps in 1953, but didnt become practical until the 1970s when it was developed further by researchers such as robert e. Substrate, gain, radiation pattern, patch antenna scientific. Common microstrip antenna shapes are square, rectangular, circular and elliptical, but any continuous shape is possible. This pattern is heavily dependent on the ground plane being relatively large to the antenna. Rectaangular microstrip patch antenna for wireless. Figure 7 shows the gain pattern of the antenna with a peak gain of 9. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. It is relatively easy to print an array of patches on a single large substrate using. Resonant frequency of an antenna in general any device is where it performs at a highest level. The patch antenna, microstrip transmission line and ground plane are made of high conductivity metal typically copper. Microstrip patch antennas or simply patch antenna are increasingly useful because the antenna is printed directly onto a circuit board. Threeelement vectors of cartesian coordinates in meters.
We will discuss later in this work more parameters of the antenna in connection with microstrip patch antenna like radiation pattern, efficiency, quality factor, directivity, gain, and more. Radiation pattern the patchs radiation at the fringing fields results in a certain far field radiation pattern. A microstrip or patch antenna operates in a way that when current though a feed line reaches the strip of the antenna, then electromagnetic waves are generated. The antenna is attractive due to its lowprofile conformal design, relatively low cost, and very narrow bandwidth. The patchmicrostrip object is a microstrip patch antenna. Dualband operation of a microstrip patch antenna on a duroid.
Microstrip patch antenna design calculator 1 mosin i memon and 2 prof. Microstrip antenna an overview sciencedirect topics. A stable omnidirectional radiation pattern is observed in the operating frequency band. Understanding the behaviour of the microstrip patch antenna and design of it for different metamaterial. The performance parameters were achieved with return loss 16. Then the bottom face and the patch antenna trace were selected and a finite conductivity boundary using copper was assigned. Manually meshing should be performed on the airbox to get accurate results for the antenna properties such as efficiency, directivity, and radiation pattern. The use of slotted patch reduces the size of antenna and higher bandwidth, which is the area that can be improved with the proposed design. The microstrip patch antenna is used in a wide range of applications since it is easy to design and fabricate.
Dual ushape microstrip patch antenna design for wimax applications. The proposed prototype antenna behavior is discussed in terms of the. This model uses an inset feeding strategy that does not need any additional matching parts. Pdf impedance matching techniques for microstrip patch antenna. The most common type of microstrip antenna is the patch 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. Name is the property name and value is the corresponding value. The radiating patch and the feed lines are usually. A slot will be placed on the ground plane and feed line will be placed on lower substrate. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces.
The radiation pattern can be represented in either cartesian or polar coordinates, as shown in figure 1. P, india abstract here we made an attempt to maximize the gain of microstrip patch antenna. In this case, each vector starts at the origin and lies along the specified points on the x, y, and zaxes. Microstrip square patch antenna using cst by shamsur rahman. The corners were truncated square microstrip antenna is mainly used for single patch designs 1. Introduction microstripe patch antenna is most widely used antenna in portable communication devices due to being conformal, compact, low cost, and ease of fabrication. A large bandwidth of 33% make this an ideal choice for experimenting. This creates two independent radiated waves that are orthogonally polarized. The microstrip patch antenna array is designed for wlan applications, at an operating frequency of 2.
A variant of the patch antenna commonly used in mobile phones is the shorted patch antenna, or planar invertedf antenna pifa. International journal of science, engineering and technology research 2. It has low radiation power and narrow frequency bandwidth. Applications include gps, usaf sgls, nasa sn including.
The figure3 shows the 2d view radiation pattern of the antenna. It consists of a flat rectangular sheet or patch of metal, mounted over a larger sheet of metal called a ground plane. Impedance matching techniques for microstrip patch antenna. Most often, microstrip antennas are made by etching the patch from a printed circuit board with conductor on both sides.
Micro strip patch antennas are widely used in compact, conformal and low cost wireless applications due to its advantages over conventional antenna. Radiation occurs mostly due to the fringing field between the patch and ground. Pdf radiation pattern investigation of n element microstrip patch. Uhf patch antennas for space antenna development corporation, inc. The patch is of length l, width w, and sitting on top of a substrate some dielectric circuit board of thickness h with permittivity. You can specify several namevalue pair arguments in any order as name1, value1. What is the formula for radiation pattern of rectangular microstrip. Multiple patch antennas on the same substrate see image called microstrip antennas, can be used to make high gain array antennas, and phased arrays in which the beam can be electronically steered. Design and performance evaluation of microstrip antenna. The radiation pattern of microstrip or patch antenna is. Typical half wave patches have efficiencies well above 90%. It also has a wide angle of beam in its radiation pattern. Designing for designing of a microstrip patch antenna, we have to select the resonant frequency and a dielectric medium for which antenna is to be designed.
The radiation pattern of microstrip or patch antenna is broad. The fields are linearly polarized, and in the horizontal direction when viewing the microstrip antenna as in figure 1a well see why in the next section. Design and simulation of microstrip phase array antenna using ads. The goal is to understand the radiation mechanism, polarization, patterns. The microstrip antenna can also be matched to a transmission line of characteristic impedance z0 by using a quarterwavelength transmission line of characteristic impedance z1 as shown in figure 2. Feb 01, 20 introduction microstripe patch antenna is most widely used antenna in portable communication devices due to being conformal, compact, low cost, and ease of fabrication.
Impedance matching techniques for microstrip patch antenna article pdf available in indian journal of science and technology 1028. Microstrip square patch antenna using cst by shamsur. The basics of patch antennas, updated orban microwave. Normalized radiation pattern for microstrip patch antenna. The microstrip patch antenna model used for the numerical simulation in ansoft hfss is shown in fig. To determine the width w, the microstrip patch antenna calculator was used to provide an initial starting point. The results obtain that microstrip patch antenna can be used as client antenna in computer and workable antenna for wireless fidelity.
Here is the link page to the various patch antenna and microstrip antenna topics. Design of square patch antenna with a notch on fr4 substrate. What is resonant frequency in a microstrip patch antenna. The fundamentals of patch antenna design and performance. The characteristics of microstrip patch antennas, microstrip sot antennas and printed dipole antennas are compared in table 1. Microstrip patch antenna array with cosecantsquared.
Patch antenna category is a curation of 10 web resources on, patch antenna for apt, the basics of patch antennas, patch antenna. Microstrip patch antenna design linkedin slideshare. Interaction of the fields generated by each pair of elements contributes towards the overall radiation characteristics. Also called patch antennas one of the most useful antennas at microwave frequencies f 1 ghz. A feed system supplies the rf power, and a ground plane is at the bottom of the patch antenna, sustaining the substrate. Dec 04, 2012 uhf patch antennas for space antenna development corporation, inc. This method employs ground plane between two substrates. Performance analysis of circular microstrip patch antenna. The project here provides a detailed study of how to design a probefed square microstrip patch antenna using hfss, v11. A patch antenna is a type of radio antenna with a low profile, which can be mounted on a flat surface. If the antenna had a 100% radiation efficiency, all directivity would be converted to gain. They are the original type of microstrip antenna described by howell in 1972.
A rogers rt 5880 duroidtm dielectric substrate with dielectric permittivity, r1 of 2. The following image shows a microstrip or patch antenna. The length l was chosen to be the same as w to obtain a symmetric radiation pattern. Click here to go to our page on circular patch antennas new for september 2018. May 20, 2016 this is an introductory lecture on microstrip patch antenna.
However, besides having several advantages, it also suffers from losses due to conductor and dielectric and reduction in gain due to surface wave 1. Effect of changes in basic parameter microstrip patch antenna on its radiation patter and other parameters can be determined by using gui. When the phase shift between the two modes is set to 90. Resonance for patch antenna is a phenomenon where most of the power.1196 253 1083 591 1225 478 621 1169 1102 372 1267 300 160 892 1223 183 1027 1276 1008 752 341 850 674 728 1254 1263 200 1021 962 859 131 710 666