The lossless substrate has a dielectric constant of 9. Create a patch antenna on a highepsilon thick substrate. Inset feed rectangular microstrip patch antenna layout. The substrate in microstrip antennas is principally needed for the mechanical support of the antenna. A rectangular patch as used in such an antenna is shown in fig. What are the exact materials used in designing a microstrip. A patch antenna was designed with these feeding techniques. This method can be employed, where two or multilayer substrate configuration is. In its simplest configuration, microstrip antenna consist of radiating patch on one side of a dielectric substrate which has a ground plane on the other side. The effect of changing substrate material and thickness on the performance of inset feed microstrip patch antenna.
The operation frequency of patch antenna was designed at 2. The effect of changing substrate material and thickness on the. The size of the antenna is usually designed such that the antenna resonates at the operating frequency, producing a real input impedance. Effects of using different substrates on the performance of. Following equations or formula are used for this microstrip patch antenna calculator. Thus, you can make a patch antenna with sheet of metal for the ground plane, and a sheet of metal for the patch. Either single or multiple feed lines are used to provide excitation to the antenna. In the drawing above, blue area is the substrate and brown area represents the top conducting layer which is half of the antenna. Design of a rectangular microstrip patch antenna using inset feed technique.
In this technique, the feed circuitry transmission line is shielded from the antenna by a conducting plane with a hole aperture to transmit energy to the antenna, as shown in figure 5. Microstrip patch antennas rmsa is analyzed by using different flexible. Microstrip patch antenna is used in mobile handset due to simple look, lower cost, small size and light in weight. An extensive judgment of rectangular microstrip patch antenna. As the microstrip patch antenna consist of a ground a patch and a substrate. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. Selecting best feeding technique of a rectangular patch. Generally, patch antenna has a shape of rectangle, and it can be feed with copper cable or microstrip line in our case. Microstrip antenna an overview sciencedirect topics. Measurement show that the half power beam width hpbw is 60o with vswr lower than 1. The factors to be considered while designing a microstrip patch antenna such as substrate selection, proper feed network, vswr, return loss and gain pattern, etc. After analysis micro strip feeding techniques for different substrate, this paper gives a better understanding of the design parameters of an antenna and their effect.
Feb 17, 2018 finite substrate microstrip line simulated with feko. Microstrip antenna has a very thin metallic strip patch t jun 03, 2015 the effect of changing substrate material and thickness on the performance of inset feed microstrip patch antenna. The rectangular patch antenna is a lowprofile antenna composed of a patch of metal mounted onto a substrate that is backed by a metallic ground plane. Microstrip patch antenna does not imply there must be a substrate other than air. Mar, 2019 substrate is a base or container on which microstrip patch metallic sheet antenna is fabricated and it plays important role in microstrip antenna functioning. Figure 3 a patch may be fed at two points along adjacent edges. If the ratio lw is close to unity, the radiation pattern will be symmetric but may not provide a resonable input impedance. The antenna was built in multilayer substrate construct by 10layers low temperature cofiber ceramic ltcc with 5 mils thickness ea. Feedline radiation is isolated from patch radiation higher bandwidth is possible since probe inductance is eliminated allowing for a thick substrate, and also a doubleresonance can be created allows for use of different substrates to optimize antenna and feedcircuit performance disadvantages.
What is the purpose of a substrate in a microstrip patch. Finite substrate microstrip line simulated with feko. The designed inset feed rectangular microstrip patch antenna operates at. An antenna that is formed by etching out a patch of conductive material on a dielectric surface is known as a patch antenna. The microstrip antenna produces maximum radiation in the broadside perpendicular to the substrate direction and ideally no radiation in the endfire along the surface of the substrate direction. The designed inset feed rectangular microstrip patch antenna operates. Edge feed, inset feed and probe feed and three distinct substrate materials. The basics of patch antennas, updated orban microwave. Comparative study of microstrip patch antenna for microstrip feed.
Gain enhancement in microstrip patch antennas by replacing. The impedance bandwidth and radiation characteristics of an aperturecoupled microstrip linefed patch antenna acmpa with a high permittivity. A feedline is used to excite the antenna for making radiation by. Top view and side view of rectangular microstrip patch antenna as shown in figure slots are separated by distance l, when, the width of the structure has a maximum. Use this property to adjust the location of the feedpoint relative to the ground plane and patch. It is used in applications from mhz to thz frequencies when size, weight, cost, reliability, and aerodynamic performance are constraints. Here we discussed different dielectric substrate frequently used in microstrip patch antenna to enhance overall efficiency of antenna. 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. Here the principal characteristics of interest are the antenna input impedance, mutual coupling, bandwidth, radiation pattern and. It consists of rectangular substrate and the metal trace layer as shown in fig. The basic structure of the microstrip patch antenna is shown in figure 1.
This antenna does not take any much extra size and can be etched on the same mobile pcb itself. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. Design and performance evaluation of microstrip antenna for ultrawideband applications using microstrip feed. Another method of feeding microstrip antennas is the aperture feed. Deschamps in 1953, but didnt become practical until the 1970s when it was developed further by researchers such as robert e. A microstrip feed line patch antenna is designed for 2. Antennas using patches as constitutive elements in an array are also possible.
Pdf effect of feed techniques and substrate material on. Different substrates use in microstrip patch antennaa survey. Modeling an lband horn antenna with waveguide feed in cadfeko. The designed inset feed rectangular microstrip patch antenna operates at 2. It consists of area of metallization supported above a ground plane by a thin dielectric substrate and fed against the ground at an appropriate location. What is the purpose of a substrate in a microstrip patch antenna. Design rectangular patch antenna using hfss part 1 duration.
The location of the feed is selected for the proper impedance, and to create a current distribution that results in the desired polarization of the radiated wave. Effects of using different substrates on the performance of an inset. This can be compensated by using a different feed type and well look at. Microstrip antenna has a very thin metallic strip patch t substrate 2 w width of the patch two slots representation of microstrip patch antenna is as shown in figure 2. Pdf the effect of changing substrate material and thickness. Microstrip patch antennas or simply patch antenna are increasingly useful because the antenna is printed directly onto a circuit board. 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. The laalo 3 was chosen as a substrate material for the designed patch antenna with a dielectric constant of 23. In the antenna in figure 1, the center conductor of a coaxial line serves as the feed probe to couple electromagnetic energy in andor out of the patch. Effect of feed substrate thickness on the bandwidth and radiation.
The performance of microstrip patch antenna system depends on the characteristics of the antenna element and the substrate as well as the feed configuration employed. The dielectric material is mounted on a ground plane, where the ground plane supports the whole structure. The dimensions of antenna can be found in the hfss simulation file. Matching reduces the loss of the signal and reflected power towards the transmission line that supplies a smooth transition of energy from the antenna input impedance to the feed line. The radiating patch and feeding lines is usually photo etched at the dielectric substrate. The presence of arrays of microstrip elements provides greater directivity, higher gain, increased transmission range with less interference. Feed line radiation is isolated from patch radiation higher bandwidth is possible since probe inductance is eliminated allowing for a thick substrate, and also a doubleresonance can be created allows for use of different substrates to optimize antenna and feed circuit performance disadvantages. Signed distance of feed from origin, specified as a twoelement real vector with each element unit in meters. So, if the designer has a clear conception about the effect of changing. Coaxialfed rectangular patch antenna lumerical support. In order to design a microstrip patch antenna at first the designer is to select the substrate material and its thickness. There are different methods of feeding a patch antenna like. Design and performance evaluation of microstrip antenna for. Design and performance evaluation of microstrip antenna.
Here, we measure the antenna parameters by varying substrate thickness h from 0. This paper presents a slottedrectangular patch antenna with proximitycoupled feed operated at dual band of millimeterwave mmv frequencies, 28ghz and 38ghz. Microstrip patch antenna construction and design aperture. A thicker substrate leads to a longer feed probe, a larger feed probe inductance and a degradation of impedance matching. Microstrip patch antenna calculator patch antenna formula. The substrate in microstrip antennas is principally needed for the mechanical support. Figure 2 feeding the patch antenna with the feedline on the underside of the substrate laminate. The dimensions of patch antenna were calculated based on the three essential parameters. What is the effect of a substrate in a microstrip antenna. The most common type of microstrip antenna is the patch antenna. The feed is offset by 4 mm from the origin along the xaxis. But patch antennas can also be formed with a collection of multiple patches on a dielectric substrate. A microstrip patch is a form of a narrow band with a wide beam antenna, which can be described simply as being made up of a metallic radiating patch and a ground plane each one at one side of a dielectric substrate and a feeding point which can either be connected to the radiating patch directly or indirectly, depending on the feeding method used.
The effect of changing substrate material and thickness on. Various substrates like foam, duroid, benzocyclobutane, roger 4350, epoxy, fr4, duroid 6010 are in use to achieve better gain and bandwidth. Here the principal characteristics of interest are the antenna input impedance, mutual coupling, bandwidth, radiation pattern and return loss. Design of a rectangular microstrip patch antenna using. Here we have shown the simplest form of patch antenna where the patch etched on the substrate is halfwavelength long while the thickness of the same is extremely less than also, excitation to the antenna is provided through feed lines connected to the patch. Substrate is a base or container on which microstrip patch metallic sheet antenna is fabricated and it plays important role in microstrip antenna functioning.
Lenghtheffective wavelength2under root of relative permitivity of substrate. Design of a rectangular microstrip patch antenna using inset. Apr 01, 2017 the substrate between patch and ground plane plays important role in design it decides the bandwidth as well as size of the microstrip antenna. Pdf the effect of changing substrate material and thickness on. Sarwar hosain 2, sohag sarker 2, makhluk hossain prio 3, monir morshed 4, ajay krishno sarkar 3. The top metallic flat region, which is called the patch antenna, sits on a dielectric substrate. Next, the results of microstrip feed line patch antenna is designed by using cad microwave. The best feeding point from the geometry of microstrip patch antenna we can understand that to couple the maximum energy to it the feed is provided beneath the ground directly see fig. Also, the excitation to the antenna is provided using feed lines connected through the patch. A feed system supplies the rf power, and a ground plane is at the bottom of the patch antenna, sustaining the substrate. Most often, microstrip antennas are made by etching the patch from a printed circuit board with conductor on both sides. The fundamentals of patch antenna design and performance. Create a rectangular patch antenna with a length of 36 mm and a width of 48 mm on a 55 mm x 80 mm ground plane.