Variations of scale factor, spacing constant and feed length analyzed for different values, which significantly affects bandwidth and gain of proposed mlpda. The mlpa contains 8 pairs of parallel elements on both sides of the microstrip feed line runs along the centre of. 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. Pdf frequency reconfigurable log periodic microstrip dipole. Three element and six element log periodic microstrip array antennas have been fabricated and tested.
This model can be used for any element of log periodic patch antenna. Pdf frequency reconfigurable log periodic microstrip. Wide kuband log periodic dipole array microstrip patch antena. Design of microstrip log periodic antenna for wireless. This link is listed in our web site directory since sunday oct 28 2007, and till today log periodic antenna design has been followed for a total of 33323 times. Pdf a bstract this paper describes the design and analysis of a logperiodic microstrip antenna array operating between 3. The main advantages of bowtie antennas are simple design and broadband impedance.
Wideband quasi logperiodic microstrip antenna article pdf available in microwaves, antennas and propagation, iee proceedings h 1283. 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. 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. Apr 21, 2015 single microstrip layer holds uwb logperiodic antenna. A log periodic antenna is an array of dipoles with mathematically related lengths and spacings. Parametric evaluation of microstrip log periodic dipole array antenna. The microstrip patch antenna is commonly used for its small size and low cost of fabrication, but its narrow bandwidth makes it inappropriate for broadband applications, thus array of microstrip patch antenna which depends upon on log periodic techniques is used for making broadband antenna. Microstrip antennas have long been used as reliable components with small profiles, large directional beams, and high gain. Wideband quasilogperiodic microstrip antenna article pdf available in microwaves, antennas and propagation, iee proceedings h 1283. The simulation and experimental studies of a wideband trapezoidal toothed log. The antenna elements and the feeding networks have been designed and simulated using ansoft hfss software. Regarding calibration of log periodic dipole antennas. The second aspect is the design of slot cut hshaped microstrip antenna, and the third is the design of five element broadband log periodic microstrip antenna.
Scaling of dimensions of patch dipole elements from one dipole element to. A series fed structure is analyzed using an equivalent circuit. However, for commercial purpose and to tune over a range of frequencies, we need to have another antenna known as the logperiodic antenna. Introduction a multi element, directional, antenna designed to operate over a wide band of frequencies a broadband, multielement, unidirectional, narrowbeam antenna. Design of substrate integrated waveguide siw fed log.
As a standard, the antenna is designed for horizontally polarized base station use but by means of an adapter, vertical polarization is also possible. To meet the requirements of two different specifications, this log periodic dipole antenna was calibrated at two different spacings. About log periodic antenna design the resource is currently listed in in 2 categories. Design and simulation of circular patch log periodic. This network consists of an opencircuited feed line with a branch line connected to each radiating element. As we are dealing with an integer number of elements. The design principle for wideband microstrip antenna with log periodicity requires an array of patch antennas with the dimensions and also the spacing of the patches are increased in a log periodic manner, so it results in the performance in. To overcome this shortcoming in microstrip antennas, several design techniques are proposed one of which is logperiodic antenna design which is studied in this. This paper focuses on the survey and analysis of planar printed uwb log periodic antenna,and. The main category is antenna design calculators that is about antenna design calculators. The design of the log periodic dipole array antenna as shown in figure 1 is somewhat of an empirically successful design.
Nsimi technologies linear polarized log periodic antennas antlpa are dipole arrays designed to have nearly constant gain and input impedance over a broad frequency range. Effect of the balanced type feed on the performance of antenna is discussed. The initial design based on the concept of log periodic structure was the log periodic toothed planar antenna following the angle concept, if one tooth has width, the next smaller one is wide, third is 2. The resource is currently listed in in 2 categories. The individual elements of log periodic antenna are. Log periodic arrays 101 alog periodic antenna is a system of driven elements, designed to be operated over a wide range of frequencies. That is, there is a bit of intuition we can give regarding this antenna as in the preceeding paragraphs.
However, for commercial purpose and to tune over a range of frequencies, we need to have another antenna known as the log periodic antenna. This paper describes the various techniques to improve the bandwidth of a microstrip antenna. Pdf the paper describes a new design method for a wideband array of log periodically scaled microstrip resonator antennas. Vhfuhf log periodic antenna vhfuhf log periodic antennanorth yagi antenna. Log periodic microstrip patch antenna miniaturization using artificial magnetic conductor surfaces by ahmad t. Printed log periodic treefractal dipole antenna the printed log periodic treefractal dipole antenna plptda is composed of an array of log periodic treefractal dipoles and a microstrip feeding line.
Frequency reconfigurable log periodic microstrip dipole antenna array for. According to the special configuration of the log periodic meandered dipole slot, we estimate the new microstrip slot antenna has the similar characteristic of log periodic antenna, such as wide. If you are not satisfied with them, return to get your money back. A log periodic antenna lp, also known as a log periodic array or log periodic aerial, is a multielement, directional antenna designed to operate over a wide band of frequencies. Design of the log periodic microstrip antenna is based on frequency independent antenna principles 7, which, when applied to a periodic structure, result in scaling of the dimensions from period to period so that the performance is periodic with the logarithm of frequency 8. A comparitive study of four different shaped frequency. The paper describes a new design method for a wideband array of logperiodically scaled microstrip resonator antennas. A band width of 7% for trapezoid toothed, 26% for zigzag toothed and 50% for crosstoothed vswr. Modeling and measuring the creative design clp52n log. Single microstrip layer holds uwb logperiodic antenna. Dipole array with defected ground structure is one of the patch modification of antenna that allows antenna to work on wideband.
Log periodic antennas antennas are designed for the specific purpose of having a very wide bandwidth. 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. One of the techniques that has been discussed in detail is the log periodic technique. A microstrip based structure of log periodic dipole array was introduced first time using modified carells method. Both a network and a radiating model for the complete structure are explained. 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 creative design clp52n log periodic antenna described here is a popular antenna in solar radio spectrometers such as those. Only the center conductor of the coaxial cable is connected to the left boom by means of. The simulated and experimental results are in good agreement.
The radiating elements are seriesfed by a simple coplanar microstrip network. Design and analysis of five element microstrip logperiodic antenna. The three square patches are fed by inset feed line technique and are connected with a single transmission line by a log periodic array formation to form a wideband frequency from 2. This paper presents the family of logarithmically periodic toothed planer antennas. The yagiuda antenna is mostly used for domestic purpose. Reconfigurable, log periodic antenna, microstrip, wideband. Such kind of antenna posses the wideband characteristic in comparison with the microstrip antenna.
A log periodic antenna is that whose impedance is a logarithamically periodic function of frequency. This link is listed in our web site directory since sunday oct 28 2007, and till today log periodic antenna design has been followed for a total of 33323. A 14 element monolayer multi octave log periodic microstrip antenna have suggested by lei et al. Elk antennas was started to give the ham the best log periodic antennas with the best gain, directivitiy, and fronttoback ratio possible for the size and price. Printed logperiodic treefractal dipole antenna the printed logperiodic treefractal dipole antenna plptda is composed of an array of logperiodic treefractal dipoles and a microstrip feeding line.
This link is listed in our web site directory since sunday sep 23 2012, and till today log periodic antenna calculator has been followed for a total of 6728 times. Frequency reconfigurable log periodic microstrip dipole. The terminal section is important, since it can greatly improve the antennas radiation pattern in the working frequency band. The achievable bandwidth is theoretically infinite. The main category is log periodic antenna projects that is about log periodic antennas. Design a broadband antenna using microstrip patch in log. Design of a logperiodic aperturefed microstrip antenna. A log periodic antenna having a layer of dielectric media interposed between a microstrip log periodic portion and a slot log periodic portion where an array of two or more log periodic antennas that may be placed about vehicles, such as air vehicles, or mounted on stationary structures, such as communication towers. About log periodic antenna calculator the resource is currently listed in in 2 categories. It was invented by dwight isbell and raymond duhamel at the university of illinois in 1958. Its advantage is that it exhibits essentially constant characteristics. The narrow bandwidth of a microstrip antenna is one of the important features that restricts its wide usage, although it possesses many advantages such as low profile, light weight, etc. A mounting flange is located at the base of the array for easy attachment to positioning systems. Various techniques have been used to enhance the bandwidth of this kind of antenna.
A logperiodic microstrip antenna is a form of travelingwave antenna. The basis of this design is the linear array of coplanar patch antennas with the size and spacing of the patches increasing in a log periodic manner. Us7583233b2 rf receiving and transmitting apparatuses. Its terminal portion works with the impedancematching load to absorb radiated energy and reduce reflected energy. The radiating elements are series fed by a simple coplanar microstrip network. Pdf design a broadband antenna using microstrip patch in.
A log periodic antenna lp, also known as a log periodic array or log periodic aerial, is a multielement, directional, antenna designed to operate over a wide band of frequencies. History and advancement of the family of log periodic toothed. The log periodic microstrip antenna 11 is a more conventional approach for the implementation of a broadband antenna. The microstrip antenna msa that we have designed can work on. The printed log periodic dipole array plpda antenna was presented by campbell et al. 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. Log periodic antenna is important with their ability to show nearly frequency independent characteristics over wide band of frequencies although they have relatively simple geometries. Pdf logperiodic patch antenna with tunable frequency. Nsimi technologies linear polarized logperiodic antennas antlpa are dipole arrays designed to have nearly constant gain and input impedance over a broad frequency range. Only the center conductor of the coaxial cable is connected to the left boom by means of a rivet. 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.
A logperiodic antenna is that whose impedance is a logarithamically periodic function of frequency. Logperiodic microstrip patch antenna miniaturization using. The inset feed distance of the microstrip antenna is chosen for 50 ohm input impedance and it is scaled log periodically. A substrate integrated waveguide fed microstrip array antenna structure using the log periodic principle has been designed. Parametric evaluation of microstrip log periodic dipole.
History and advancement of the family of log periodic. In this the dimensions of the successive sections were increased in geometric progression for a wide bandwidth usage. Sae arp 958 society of automotive engineers, aerospace recommended practice requires an antenna spacing of one meter, measured tip to tip. The 17element vhfuhf lpa antenna was placed in service on 26 may 2010 see pictures below and removed from service 1 june 2011. Also looking at these log periodic antenna equations or formulas it is possible to see why the antenna gain its name.
Kumar, design and analysis of five element microstrip logperiodic antenna, international conference on applications of electromagnetism and student innovation competition awards, taipei, 11 august 2010, pp. Parametric evaluation of microstrip log periodic dipole 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. In order to achieve the characteristic of multiband antenna and wideband antenna, here the technique is introduced that is the array of the microstrip patch antenna in a log periodic manner. But log periodic antenna using a microstrip patch is the efficient technique for the enhancement of the bandwidth1112. Vhfuhf log periodic antenna north yagi antenna 17 element very high frequencyultra high frequency log period dipole array. It is possible to explain the theory behind the log periodic antenna in a qualitative basic form. You can build a microstrip log periodic antenna up to 1. The log periodic dipole array, lpda is generally able to operate over a frequency range of around 2. These simple formulas give an insight into the log periodic antenna theory. This paper presents a planar microstrip array designed by the logperiodic technique for wideband operation in. Like the yagi antenna it exhibits forward gain and has a high front to back ratio, but the lpda is able to operate over a much wider bandwidth and will have a lower gain.
The conventional log periodic dipole array antenna design was proposed by r. The feed coax is routed through the inside of the right boom. The most common form of logperiodic antenna is the logperiodic dipole array or lpda, the lpda consists of a number of halfwave dipole driven elements of gradually. The design of a quasi log periodic microstrip antenna can be carried out as follows. Comparison of dipole, bowtie, spiral and logperiodic ir antennas. This paper presents a microstrip log periodic dipole array antenna design based on geometrical parameter variation for attainment of desired resonant frequency, operating bandwidth and gain. Like the yagi antenna it exhibits forward gain and has a high front to back ratio, but the lpda is able to operate over a much wider bandwidth and will have a lower gain for an equivalent number of elements. Pdf download apr 21, 2015 microstrip antennas have long been used as reliable components with small profiles, large directional beams, and high gain. Online calculator lpda logarithmic periodic dipole antenna. The design principle for wideband microstrip antenna with log periodicity requires an array of patch antennas with the dimensions and also the spacing of the patches are increased in a log periodic manner, so it results in the performance in periodic w ith the logarithm of frequency. Logperiodic antennas antennas are designed for the specific purpose of having a very wide bandwidth. Log periodic antenna calculator resource detail the.
1169 131 858 285 587 376 878 1426 354 1089 799 1161 371 1306 366 660 1176 56 348 12 1117 631 510 947 1077 366 1349 735 1116 989 1205 504 580 655