The radiation patterns of the hexagonal patch antenna with slot in the ground plane are simulated at 3. The patch antenna is a good place to start for antenna fundamentals with more coming. China 2 department of physics and electronic science, chuxiong normal university, chuxiong, 675000, p. The approach can be applied to reduce the crosspolarization level of any conventional patch in working condition, but without any perturbation in the patch and the ground plane. Rectangular patch antenna performances improvement. The radiation pattern of microstrip or patch antenna is. This rectangular microstrip patch antenna is designed for wireless communication application that works at 2. The waves from the patch start getting radiated from the width side. Microstrip patch antenna design santa clara university. Using the fractal technology,on sierpinski carpet antenna, return loss measurement, radiation pattern etc. A microstrip patch that uses a thicker substrate is more efficient. Wideband unidirectional bowtie antenna with pattern improvement jiayue zhao, zhiya zhang, nengwu liu, guang fu, and shuxi gong abstracta wideband unidirectional bowtie antenna with stable radiation patterns is proposed and investigated. A surface wave influence in radiation pattern is often considered unwanted.
Impedance bandwidth and gain improvement for microstrip. In order to identify and verify the improvement for rectangular structure in microstrip antenna, the conventional microstrip antenna design method is used 1. Properties of a basic microstrip patch a microstrip or patch antenna is a lowprofile antenna that has a number of. Radiation pattern of the microstrip patch antenna figure 3. Designing the patch antenna is to employ the following formulas as an outline for the design procedures. It also has a wide angle of beam in its radiation pattern. Radiation patterns of the microstrip leaky wave antenna with d 31. Design and improvement of microstrip patch antenna. Radiation patterns of eplane xz, and hplane yz, are presented in. Impedance bandwidth and gain improvement for microstrip antenna using metamaterials han xiong 1, jingsong hong 1, yuehong peng 2 1 inst. It is fed by a wideband microstrip balun, using a coupling triangular structure to induce. Improvement of microstrip patch antenna radiation patterns ieee. Thus, impedance bandwidth increases with increasing substrate thickness. The proposed repeater antenna consists of a server antenna, a donor antenna, and alumina housing.
Wideband unidirectional bowtie antenna with pattern. Gain improvement techniques for rectangular microstrip. Improving the efficiency of microstrip patch antennas springerlink. The microstrip antenna produces maximum radiation in the broadside direction. Microstrip patch antennae radiate primarily because of the fringing fields between the patch edge and the ground plane. Efficiency improvement and crosspolarization reduction of.
In case of satellite communication circularly polarized radiation patterns are required and this can be realized using either square or circular patch with one or two feed points. It consists of a rectangular metal patch on a dielectric substrate and is excited by a voltage source across the metal patch and the bottom ground plane of the substrate. Variation of the dielectric thickness resulting changes in antenna performance from fig 4. Book topics include discussion of arrays, spectral domain, high tc superconducting microstrip antennas, optimization, multiband, dual and circular polarization, microstrip to waveguide transitions, and improving bandwidth and resonance frequency. 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. The microstrip patch antenna is probably the best characterized of the planar microwave antennas and the most frequently used, yet its radiation pattern is often far. Improvement of a circular microstrip antenna excited by. Pdf improvement of microstrip antenna performance on thick and. For good antenna performance, a thick dielectric substrate having a low dielectric constant radiation. Improvement of efficiency parameter of a microstrip patch antenna. For a microstrip antenna to work, you want to think the opposite thoughts that you might want to think if you were designing a microstrip mmic.
This paper presents the isolation improvement techniques of a microstrip patch array antenna for the indoor wideband code division multiple access wcdma repeater applications. Advancement in microstrip antennas with recent applications. Radiation efficiency, h, and unloaded radiation q, q o, as a functionof substrate thickness. Figure 2 present the simulated 2d cut view and 3d far zone eplane radiation patterns for this antenna. The above equation says that the microstrip antenna should have a length equal to one half of a wavelength within the dielectric substrate medium. Pdf radiation pattern improvement of a microstrip patch. Afterward, radiation patterns of the crmpa in the e and h plane for both with and without rsdgs are shown in. By using compound techniques 19, a new type of stacked microstrip patch antenna that increases the frequency bandwidth has also been studied. To enhance microstrip antenna performance, it was necessary to understand the impact of the size of the omega structure serving as a lens on the radiation patterns and antenna performance.
A wideband differentialfed microstrip patch antenna based on. The discussions and conclusions of this paper are helpful in designing and improving the performance of microstrip patch antennas as per need of the society. A miniaturized design of microstrip patch antenna has been proposed for significant improvement in crosspolarization purity. Keywords rectangular microstrip patch antenna, antenna feed, antenna radiation pattern. The goal is to understand the radiation mechanism, polarization, patterns, impedance and bandwidth. The following image shows a microstrip or patch antenna. Keywords radiation efficiency, rectangular microstrip patch antenna. Microstrip patch antennas are more popularly used now a. In addition, as the substrate thickness increases, the radiation q of the antenna decreases.
Design of microstrip antenna array with suppressed back lobe. The aim of this paper is to improved bandwidth and return loss of a crossed monopole microstrip patch antenna and study the effect of antenna and ground dimension length l, width w and substrate parameters relative dielectric constant, substrate thickness on radiation parameters of bandwidth. One approach is to construct the singlefeed switchable feed network structure with an msnri coupledline coupler in order to reduce the mutual coupling level between antennas. Here is the link page to the various patch antenna and microstrip antenna topics. In the present endeavor a rectangular patch antenna is designed on thick substrate and. 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. Flexible and miniaturized design of microstrip patch. Microstrip patch antennas typically have radiation patterns containing unwanted sidelobes or local minima caused by surface waves, especially when fabricat. If you like this video please share and subscribe and comment for improvement in this video.
The performance criteria of the proposed antenna have been experimentally verified by fabricating a printed prototype. Microstrip patch antenna design principles ben horwath. The basics of patch antennas, updated orban microwave. The performances of the crmpa are characterized by varying. Antennas using patches as constitutive elements in an array are also possible. The patch dimensions are determining the shape of the antenna and it is smaller comprised to the ground plane and the substrate. The radiation pattern can be represented in either cartesian or polar coordinates, as shown in figure 1. Microstrip antennas or patch antennas are popular for their attractive. Improvement of the performance of microstrip patch antenna. Design and analysis of microstrip patch antenna arrays. The perspective view of a microstrip patch array antenna system for the indoor wcdma repeater is shown in figure 7. Study on the improvement of bandwidth of a rectangular. A return loss improvement of slotted square microstrip insetfeed patch antenna 024 the radiation patch constructed from a metal such as gold or copper. Design of slotted ground hexagonal microstrip patch.
Amc structures with a square, circular, or octagonal patch on a unit cell are designed and applied to circular microstrip. Bandwidth enhancement of a dual band planar monopole. A wideband differentialfed microstrip patch antenna based on radiation of three. 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 3d radiation pattern observed for the values of patch length l. Fig 14a and 14 b shows the radiation pattern for the antenna at 8. Meanwhile, the proposed antenna maintains a stable radiation pattern in the. A meanderedmicrostrip fed circular shaped monopole antenna loaded with vertical slots on a high dielectric material substrate. The results obtain that microstrip patch antenna can be used as client antenna in computer and workable antenna for wireless fidelity. These plots show simulated gain for the microstrip antenna with a singlelayer metamaterial lens at different values of distance d1. Results the designed microstrip patch antenna with four slits and a pair of truncated corners are simulated using cadfeko for finding the electric.
Department of electronics and communication engineering national institute of technology, rourkela769008 certificate this is to certify that the thesis entitled, enhancement of bandwidth and. One of the most useful antennas at microwave frequencies f gt 1 ghz. The most common type of microstrip antenna is the patch antenna. The center frequency will be approximately given by. The proposed microstrip patch antenna is compact, miniature,coste. The paper shows that removal of the substrate beneath the patch can greatly. Overview of microstrip antennas 1 overview of microstrip antennas david r. Feedline radiation is isolated from patch radiation. Bandwidth improvement of microstrip crossed monopole. Pdf radiation pattern improvement of a microstrip patch antenna. A wideband microstrip antenna with symmetric radiation.
In 20, the bandwidth of an aperture coupled microstrip patch antenna has been improved by using an appropriate. Microstrip patch antennas typically have radiation patterns containing unwanted sidelobes or local minima caused by surface waves, especially when fabricated on high dielectricconstant substrates. Improvement of microstrip patch antenna radiation patterns abstract. 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. Microstrip square patch antenna using cst by shamsur rahman akash. Read a wideband microstrip antenna with symmetric radiation patterns, microwave and optical technology letters on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Radiation pattern improvement of a microstrip patch. Thus the microstrip patch radiation intensity depends on what direction you are facing it from it has gain and directivity. The designed microstrip antenna showed significant suppression of surface modes compared to conventional patch antenna, thus, improving the gain and farfield radiation pattern. The magnitude of the radiation pattern from the peak of the main beam decreases by 50% or. A standard double ridged horn antenna is used as a reference antenna.
Improvement of microstrip patch antenna radiation patterns. These results show that a microstrip patch antenna mainly radiates in the vertical direction. The use of uniplanar doublespiral resonant cells embedded in the microstrip feed line can create a bandstop response that effectively suppresses unwanted harmonic radiation in patch antennas. Metamaterial enhances microstrip antenna gain microwaves. This unit will give the basic picture regarding microstrip antenna configurations, methods of analysis and some feeding techniques. The multifeed circular microstrip antennas can generate a high circularly polarized performance by using a different feed arrangement. Isolation improvement of a microstrip patch array antenna. The frequency of operation of the patch antenna of figure 1 is determined by the length l. Bandwidth improvement for compact microstrip patch. Study on the improvement of bandwidth of a rectangular microstrip patch antenna. Selecting best feeding technique of a rectangular patch.
The radiation patterns and s11 performance are used for the analysis of the different configurations. Microstrip patch antenna meets all requirements and various types of microstrip antennas have been designed for use in mobile communication systems. Richards, theory and experiment on microstrip antennas. We use the cavity model to explain the operation of the patch antenna.
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