Buy products related to log periodic antenna products and see what customers say about log periodic antenna products on free delivery possible on eligible purchases. Its advantage is that it exhibits essentially constant characteristics over the frequency rangethe same radiation resistance and. A logperiodic antenna is that whose impedance is a logarithamically periodic function of frequency. A novel meander line microstrip logperiodic dipole. Recent trends and developments 1085 reported in 7 which shows more than 90% of swr pdf download. One of the most frequently used types of microstrip antennas, the patch antenna, is depicted in fig. This unit will give the basic picture regarding microstrip antenna configurations, methods of analysis and some feeding techniques. The design, analysis, and simulation of an 11502450 mhz logperiodic dipole antenna have been presented. A more formal name is logarithmic periodic dipole array lpda.
Design a broadband antenna using microstrip patch in log. Logperiodic toothed planar antenna on lcp for ultra wide. It has radiation and impedance characteristics that are repeated as a logarithmic function of excitation frequency. The yagiuda antenna is mostly used for domestic purpose. Multioctave bandwidth logperiodic microstrip antenna array, iee proc. A unique metamaterial inspired starslot uwb antenna with soft. The concept of reconfigurable antenna is widely used as an additional feature of reconfigurable ability for future wireless communication systems especially for cognitive radio applications, radar system and multifrequency communications. It is possible to explain the theory behind the log periodic antenna in. A logperiodic antenna lp, also known as a logperiodic array or logperiodic aerial, is a multielement, directional antenna designed to operate over a wide band of frequencies. The printed log periodic dipole array plpda antenna was presented by campbell et al.
The broadband property of the proposed antenna is achieved by choosing a proper selection of dimensions and positions of slot and notch on the radiating patch. Logperiodic microstrip patch antenna miniaturization using artificial magnetic conductor surfaces by ahmad t. Cst to further mark the metal parts and then export to pdf, with the defined scale size. As a standard, the antenna is designed for horizontally polarized base station use but by means of an adapter, vertical polarization is also possible. The microstrip patch antenna is used in a wide range of applications since it is easy to design and fabricate. Design and analysis of five element microstrip logperiodic antenna. The proposed antenna comprises periodically repeated starslot unit cells on patch radiating side.
Several theoretical analysis techniques are by coaxial connections at periodic intervals along both radiat summarized,including transmissionline and modal. Each patch is fed by a rod which is approximately modeled by a charged filament of finite length. Frequency reconfigurable log periodic microstrip dipole. The log periodic dipole antenna lpda is one of the most used frequency independent antennas. A novel design of broadband patch antenna is presented in this paper. A logperiodic antenna is an antenna that can operate on a wide frequency band and has the ability to provide directivity and gain.
Wideband quasi logperiodic microstrip antenna article pdf available in microwaves, antennas and propagation, iee proceedings h 1283. Pdf this paper describes the design of the log periodically scaled microstrip patch antenna. Log periodic antenna ppt free download as powerpoint presentation. A miniaturized periodic microstrip leaky wave antenna with. The multifeed circular microstrip antennas can generate a high circularly polarized. Design of log periodic dipole array antenna using two. It was invented by dwight isbell and raymond duhamel at the university of illinois in 1958 the most common form of logperiodic antenna is the logperiodic dipole array or lpda, the lpda consists of a number of. Because of the image theory, a conventional wire antenna. The achievable bandwidth is theoretically infinite.
Log periodic antenna aerial the log periodic antenna or aerial often called the lpda is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies. Simulation of reconfigurable logperiodic microstrip antenna. Log periodic arrays 101 alog periodic antenna is a system of driven elements, designed to be operated over a wide range of frequencies. The four layers of the printed lpda antenna are printed on three thin. Dual linear polarizationtable 2 our ds series antennas are lightweight, medium gain log periodic dipoles designed to transmit and receive signals over a broadband. Log periodic antenna arrays are often used for diplomatic traffic on the hf bands. Improvement of a circular microstrip antenna excited by four feeds.
Microstrip log periodic antenna using circuit simulator. The array dipoles are fed in an alternate way with two microstrip lines printed on the opposite sides of a dielectric slab as in figure 2a. Pdf frequency reconfigurable log periodic microstrip. Each element is an array of m patches having the rectangularcylindrical shape. Log periodic arrays are well known for their broad band width with moderate gain. Log periodic monopole antenna computer analysis and radiation pattern. Also looking at these log periodic antenna equations or formulas it is possible to see why the antenna gain its name.
Modeling and measuring the creative design clp52n log. Accessibility our blog news contact and help cambridge core legal. Almutawa a thesis submitted in partial fulfillment of the requirements for the degree of master of science in electrical engineering department of electrical engineering college of engineering university of south florida. This paper presents the simulation and experimental investigations of a special printed microstrip slot antenna, which is formed by cutting a log periodic meandered dipole slot in the microstrip. Design of compact microstrip patch array for wide band. Logperiodic antennas antennas are designed for the specific purpose of having a very wide bandwidth. However, for commercial purpose and to tune over a range of frequencies, we need to have another antenna known as the logperiodic antenna. A high gain wideband circularly polarized microstrip antenna. Even the parasitic radiation of the feeding microstrip network, which can deform the directivity pattern 8.
Its active region, that portion of the antenna which is actually radiating or receiving radiation efficiently shifts with frequency. A printed lpda antenna fed by a microstrip line to double sided. Lowprofile wideband microstrip antenna based on multiple modes. The following image shows a microstrip or patch antenna. These antennas are fractal antenna selfsimilar antenna arrays. Blog posts, news articles and tweet counts and ids sourced by. The logperiodic microstrip antenna lpa design, with various number of elements was proposed in 4, 5. Excitation of a periodic cylindrical microstrip n element. A high gain wideband circularly polarized microstrip antenna arun kumar, santanu.
A miniaturized periodic microstrip leaky wave antenna mlwa with shorting pins is proposed in this paper. Pdf design and analysis of five element microstrip log. With the microstrip antenna, l2 is a bit too big for consumer mobile devices typically for space and military applications easy to designmanufacture, yet very capable good value, great for antenna arrays. The radiation pattern of microstrip or patch antenna is. The antenna is attractive due to its lowprofile conformal design, relatively low cost and very narrow bandwidth. We consider the problem of excitation of a periodic cylindrical microstrip antenna array which consists of n elements placed periodically in the azimuthal plane on the surface of a dielectric substrate. Logperiodic toothed planar antenna on lcp for ultra wide band. Directional antennas provide increased performance over dipole antennasor omnidirectional antennas in generalwhen greater concentration of radiation in a certain direction is desired. Previously, the logperiodic microstrip patch antenna, which consists of square patch elements, was investigated 16.
Conclusion the frequency reconfigurable log periodic microstrip dipole array operated over c,x and ku bands has been designed and simulated by ansys hfss. This logperiodic antenna is constructed on a highquality fibreglass substrate, with a 20db amplifier directly mounted on the substrate, together with other surfacemount circuitry and a standard 9v pp3 type battery holder. The conventional log periodic dipole array antenna design was proposed by r. Design a broadband antenna using microstrip patch in log periodic format er. Ebgs are periodic substrates which include small patches on a substrate with connecting vias. Or, you can model a microstrip patch antenna to see if the electric field is. The secrets of the log periodic antenna foundation. The simulation results shows that the proposed antenna array can be successfully used as ultra wide band antenna over frequency range from 4 ghz to 18 ghz. Novel design of microstrip antenna with improved bandwidth. We observe, nevertheless, that designing a uwb log periodic antenna to provide high efficiency is rather more difficult than it is when dealing with the conventional narrowband antennas. The bandwidth of the proposed antenna is found to be 30. Pdf frequency reconfigurable log periodic microstrip dipole.
This paper focuses on the survey and analysis of planar printed uwb log periodic antenna,and. A compact, lowprofile logperiodic meandered dipole array. Introduction to microstrip antennas free download as powerpoint presentation. As discussed in a previous blog post, we can accomplish this by using a. 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. Antenna design the concept of log periodic wire antennas is applied to microstrip printed technology, to get the antenna layout shown in figure 1.
Introduction to efficiently modeling antennas in comsol multiphysics. Microstrip patch antenna design santa clara university. Modeling and measuring the creative design clp52n log periodic antenna whitham d. The log periodic antenna works the way one intuitively would expect. Logperiodic microstrip antenna actual design has 18 patches. Three different sub bands show 30% bandwidth for each band. Frequency reconfigurable log periodic microstrip dipole antenna array for wideband applications. Logperiodic microstrip patch antenna miniaturization. The d esign principle for log periodic w ideband microstrip antenna requires scaling o f dimensions from period to p eriod so that th e performance is periodic with the logarithm of. The length of the longest dipole element of a typical lpda antenna should be. In order to improve on these parameters, microstrip. The log periodic antenna is used in many areas wide bandwidth levels are needed along with directivity and gain. Learn how to model antennas efficiently and accurately using comsol multiphysics. We discuss the properties of log periodic antennas on the previous log periodic tooth antenna page.
Patterns are somewhat hemispherical, with a moderate directivity about 68 db is typical. Free online engineering calculator to find the dimensions of a logarithmic periodic dipole antenna for a given frequency range and length. Now we expand on that design further and introduce the logperiodic dipole antenna array sometimes abbreviated lpda in figure 1, we show the basic 5 element logperiodic dipole antenna array. The integration of reconfigurable antennas with radio frequency rf. In lpa, each element operates at a different frequency and they are arranged in an array.
Log periodic antennas wide band, high gain, low vswr small size, light weight, easy assembly cd model clp5x series is a high gain, wide band vhf and uhf log periodic type beam antenna. Antenna design the concept of logperiodic wireantennas is applied to microstrip printed technology, to get the antenna layout shown in figure 1. Comsol multiphysics simulation showing a logperiodic antenna. Easy to incorporate with other microstrip circuit elements and integrate into systems. Analysis, design, and simulation of a log periodic antenna. These simple formulas give an insight into the log periodic antenna theory. The longest element is active at the antennas lowest usable frequency where it acts as a half wave dipole. In this paper, a novel meander line microstrip logperiodic dipole antenna for dualpolarized radar systems is presented and optimized, working in the reference frequency band 28ghz. Pdf microstrip antenna technology pradyumna patra academia.
Overview of microstrip antennas 1 overview of microstrip antennas david r. Logperiodic dipole array lpda with a coaxial feed this is typically 50. Abstractin this letter, a lowprofile microstrip antenna is pre sented for wideband. Stutzman, wl and thiele, ga 1998 antenna theory and design, 2nd edn.
Pdf logperiodic patch antenna with tunable frequency. Logperiodic antennas manufacturers category is a curation of 7 web resources on, kma antennas, tennadyne, acom. One of the most useful antennas at microwave frequencies f gt 1 ghz. A directional antenna or beam antenna is an antenna which radiates or receives greater power in specific directions allowing increased performance and reduced interference from unwanted sources. Introduction a log periodic antenna is an array of dipoles with mathematically related lengths and spacings. For many applications microstrip antennas well suited because of its inherent.
Two elements of inset feed microstrip antenna, have been designed for each band of frequency using the log periodic technique, as proposed by a. Figure 3 a shows the simulated gain, directivity and efficiency of the antenna for wideband operations while the simulated gain for sub bands are represented at. Introduction in telecommunication, a logperiodic antenna is a broadband, multi element, directional, narrowbeam antenna that has impedance and radiation characteristics that are regularly repetitive as a logarithmic function of the excitation frequency. It consists of a metal patch on top of a grounded dielectric substrate. This group has recently reported a linearly polarized coplanar capacitive fed wideband microstrip antenna which provides input impedance bandwidth s. Parametric evaluation of microstrip log periodic dipole. A novel planar printed logperiodic dipole array lpda antenna fed by tapered microstrip line msl to double. A microstrip based structure of log periodic dipole array was introduced first time using modified carells method. A power switch is provided directly on the antenna.
262 970 1397 1376 361 211 1510 1378 1301 1538 218 572 746 510 228 1100 1521 226 1080 1124 336 759 992 1429 104 223 1087 227 309 721 1443 409