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In the process, the single wide mkcrostrip has been split into multiple narrow band regions catering to specific bands in the WiMAX standard. These patch antennas have been probe-fed. Define Parameters The basic U-slot patch antenna consists of a rectangular patch radiator within which a U-shaped slot has been cut out. As discussed in , the patch itself is on an air substrate and sloh so as to enable higher bandwidths to be achieved.The microstrip antenna having single u-shaped slot on the patch is fed by 50Ω microstrip line and the main advantage of using the microstrip line feeding is that its ease of fabrication and the impedance matching is simple by controlling the inset cut position and . Slot antenna differs with patch antenna in many aspects. Actually, slot antenna is a radiating element formed by a slot in a metallic surface. Patch antenna is actually a patch antenna placed over a antenna base. 1. Slot antenna is easy and less c. Bandwidth Limitations of the Basic Microstrip Patch Antenna Thus one cannot obtain wide bandwidth (> 6 %) just by increasing the thickness t. Also, there is a lower bound on the value of The U-slot patch (Huynh and Lee, ; Lee et al. ; Tong et al. ).
patch The presence of the slot structure achieves additional capacitance within the structure which combines with the inductance of the long probe feed to create a double resonance within the band.
The antenna parameters based on  are defined and shown in a drawing below. Boolean subtraction operation is used among the shape primitives for this purpose. Create the ground plane shape for the antenna. The groundplane in this case is rectangular and 71 mm x 52 mm in size. Use the pcbStack to define the metal and dielectric layers and microstrip feed for the single Slot patch antenna.
The layers are defined top-down. In this case, the top-most layer is a metal layer defined by the U-slot patch shape.
The second layer is a dielectric material, air in this case, antennw the third layer is the metal ground plane. Mesh the structure by using a maximum edge length which is one-tenth the wavelength at the highest frequency of operation which is 6 GHz for this example. Compute and plot the reflection coefficient for this antenna over the band. The reflection coefficient is plotted with a reference impedance of 50 ohms. To achieve dual-band behavior as shown in , , the double resonance is modified such that the two contributing resonances, i.
To do so the existing slot parameters are adjusted and a second slot is introduced into the structure. The parameters for the double U-slot are listed below as per  and a figure annotated with the variables used is shown.
U-Slot Microstrip Patch Antenna for Wireless Application | Open Access Journals
Mesh the structure at the highest frequency of operation and calculate the reflection coefficient. For triple-band operation a third U-slot is introduced and the existing slot parameters are adjusted.
The parameters are shown below based on .
The models of the multi-band single layer U-slot patch antenna as discussed in , and  have been built and analyzed and agree well with results reported. Lee, S. In the mlcrostrip coupled feed, the radiating patch and the microstrip feed line are separated by the ground plane.
In this technique, the patch and the feed line is coupled with the ground plane through the slot.
Modeling and Analysis of Single Layer Multi-band U-Slot Patch Antenna - MATLAB & Simulink
The slot should be placed at the centre in order to have low cross polarization but due to multiple layers and the increased thickness, the antenna fabrication is difficult. In the proximity coupled feed, which is otherwise called as the electromagnetic coupling, two dielectric substrates are used and the feed line is between the two substrates among which the radiating patch is on the top of the upper substrate and the ground plane is on the lower substrate.
Using this technique, the unwanted radiations can be eliminated but the antenna fabrication is difficult because of the two dielectric substrates. Therefore, the microstrip line feed has been chosen for the rectangular microstrip antenna for better radiation and it is designed using the operating frequency of 5. Economou et al.Slot antenna differs with patch antenna in many aspects. Actually, slot antenna is a radiating element formed by a slot in a metallic surface. Patch antenna is actually a patch antenna placed over a antenna base. 1. Slot antenna is easy and less c. Bandwidth Limitations of the Basic Microstrip Patch Antenna Thus one cannot obtain wide bandwidth (> 6 %) just by increasing the thickness t. Also, there is a lower bound on the value of The U-slot patch (Huynh and Lee, ; Lee et al. ; Tong et al. ). Modeling and Analysis of Single Layer Multi-band U-Slot Patch Antenna. Open Script. The standard rectangular microstrip patch is a narrowband antenna and provides dBi Gain with linear polarization. This example based on the work done in ,, models a broadband patch antenna using a slot in the radiator and develops a dual-band and a tri.
Patches and microwave circuits within the glass laminate will introduce even more uncertainty into the resonant frequency and bandwidth. Dual-frequency planar antenna for handsets is presented by Chiba et al. A new type of patch element is presented. The patch is suspended over the microstrip plane slot supported by a nonconductive pin.
It patch fed by a threedimensional 3-D transition connecting the patch to a perpendicular connector. For many applications, this geometry eliminates the need for the parasitic elements and the dielectric substrate necessary to support them. In this paper, electrically small microstrip patches incorporating shorting posts are thoroughly investigated.
These antennas are suitable for mobile communications handsets where limited antenna size antenna a premium. Techniques to enhance the bandwidth of these antennas are presented and performance trends are established. From these trends, miceostrip insight to the optimum design, namely broad bandwidth, small k, and ease of manufacturing, is given.
Leclaratne et al. It is designed by using two semi-discs with single feeding.
anteenna The antenna is circularly polarized and suitable for mobile satellite communications and if fed as individual semi-rings as a dual band orthogonally polarized antenna.
Lafond et al. The thickness has a strong effect on impedance matching at high frequencies owing to the ratio between patch thickness and the wavelength, which increases with frequency. The aim of the project is to design u-slot rectangular microstrip Patch antenna and to study their radiation antenna, return loss, VSWR, gain and directivity. Length and Width of the antenna can be predicted using the design equation. As in modern communication is concerned in microstrip reduction and portability, miniaturization and good cost to quality ratio are the pattch things in our project.
Here the existing system design sloy has been calculated and the designed frequency of 5. The dielectric material selected for this design is RT duroid The design specifications slot patch are below:.
Modeling and Analysis of Single Layer Multi-band U-Slot Patch Antenna
These parameters are microsteip for operating frequency of 5. It has Patch duroid as the dielectric substrate which has atenna relative permittivity which is equal to 2. There are some parameters that microstrip the antenna performance in slot two of them have a very noticeable effect in determining the performance of the antenna.
Antenna return loss has become efficient according to the parameter changes and these parameter effects will be explained and summarized in this section.
Fig 3 shows the return loss for the single micrlstrip antenna which is the simulated result. From the Fig 3, it can be shown that the U-slot microstrip patch antenna at 5. The graph is plotted for frequency in GHz versus return loss in dB. The graph is plotted for the frequency ranges from 4. Since the antenna has been designed for 5.
The impedance mismatch occurs from 4. The designed antenna is radiating all its power in one direction and therefore the optimized antenna has result with the effective radiation pattern and therefore the side lobes or nulls in the pattern has been minimized and the better directivity is achieved. The radiation pattern for the proposed system antenna has angles in phi and theta. In the figure, phi is represented in red colour and theta is represented in purple colour.
The antenna is radiated from the angle of 45 degrees and has the magnitude of 7. The proposed antenna explains and illustrates the simulation of the microstrip antenna with single u-shaped slot on the patch.
This antenna is compact, have a flexible structure and easy to use compared with other antennas. Thus, the very low return loss of less than dB is achieved which is suitable for the wireless applications and in the c-band of satellite communication systems.
This antenna has been simulated for the frequency of 5.