26-06-2012, 03:56 PM
Design and Simulation of a Rectangular Micro strip Patch Antenna parameter for wireless Applications
[attachment=25622]
Abstract:
In the recent years the development in communication systems requires the development of low cost, minimal weight, low profile antennas that are capable of maintaining high performance over a wide spectrum of frequencies. The popularity of micro strip antennas are increasing day by day because of ease of analysis and fabrication, and their attractive radiation characteristics. There are various types of micro strip antenna that can be used for many applications in communication systems. Rectangular micro strip antenna is a very useful & essential device for effective wireless communications. This paper presents the design of a rectangular micro strip patch antenna to operate at frequency range of 2 GHz to 2.5 GHz( S-band) is the most suitable frequency range for many wireless applications such as Wi-Fi, Wi Max. The study involves using Mat lab program to obtain the antenna dimensions and to determine its performance. This antenna is based on a thickness of 1.2mm with a dielectric constant of approximately 2.2, is a probe feed and has a partial ground plane. After simulation, the antenna performance characteristics such as antenna input impedance(real and imaginary parts),VSWR, and Return Loss are obtained.
Introduction:
Antennas play a very important role in the field of wireless communications. Patch antennas play a very significant role in today’s world of communication systems. A Micro strip patch antenna (Fig 1) is very simple in the construction using a conventional Micro strip fabrication technique. The most commonly used Micro strip patch antennas are rectangular and circular patch antennas.
The Micro strip antennas have a lot of popularity based on their applications, which has some Merits i) These antennas have some similarities as of the conventional microwave antennas, as these cover a broader range of frequency from 100 MHz to 100 GHz, same is the case with these Micro strip antennas. ii)These are widely used in the handheld devices(wireless) such as pager, mobile phones, etc.
Rectangular Micro Strip Antenna Geometry:
Micro strip antenna consists of a very thin (t << λ0 where λ0 is the free – space wavelength) metallic strip (patch) placed a small fraction of a wavelength (h << λ0, usually 0.003λ0 ≤ h ≤ 0.05λ0) above a ground plane. The Micro strip patch designed so its pattern maximum is normal to the patch (broadside radiator). This is accomplished by properly choosing the mode (field configuration) of excitation beneath the patch. In designing Micro strip antennas, a number of substrate can be used. The dielectric constant of the substrate usually ranges of 2.2 ≤ εr ≤ 12. Thick substrates whose dielectric constant is in the lower range is the most desirable for antenna performance because they provide better efficiency, larger bandwidth, loosely bound fields for radiation into space, but at the expense of larger element size .
Design Requirement
There are three essential parameters for design of a coaxial feed rectangular microstrip Patch Antenna. Firstly, the resonant frequency ( f0 ) of the antenna must be selected appropriately. The frequency range used is from 2GHz -2.5GHz and the design antenna must be able to operate within this frequency range. Secondly, the dielectric material of the substrate (εr) selected for this design is 2.2. The dielectric constant of the substrate material is an important design parameter. Low dielectric constant is used in the prototype design because it gives better efficiency and higher bandwidth, and lower quality factor Q. The low value of dielectric constant increases the fringing field at the patch periphery and thus increases the radiated power. The proposed design has patch size independent of dielectric constant.
[attachment=25622]
Abstract:
In the recent years the development in communication systems requires the development of low cost, minimal weight, low profile antennas that are capable of maintaining high performance over a wide spectrum of frequencies. The popularity of micro strip antennas are increasing day by day because of ease of analysis and fabrication, and their attractive radiation characteristics. There are various types of micro strip antenna that can be used for many applications in communication systems. Rectangular micro strip antenna is a very useful & essential device for effective wireless communications. This paper presents the design of a rectangular micro strip patch antenna to operate at frequency range of 2 GHz to 2.5 GHz( S-band) is the most suitable frequency range for many wireless applications such as Wi-Fi, Wi Max. The study involves using Mat lab program to obtain the antenna dimensions and to determine its performance. This antenna is based on a thickness of 1.2mm with a dielectric constant of approximately 2.2, is a probe feed and has a partial ground plane. After simulation, the antenna performance characteristics such as antenna input impedance(real and imaginary parts),VSWR, and Return Loss are obtained.
Introduction:
Antennas play a very important role in the field of wireless communications. Patch antennas play a very significant role in today’s world of communication systems. A Micro strip patch antenna (Fig 1) is very simple in the construction using a conventional Micro strip fabrication technique. The most commonly used Micro strip patch antennas are rectangular and circular patch antennas.
The Micro strip antennas have a lot of popularity based on their applications, which has some Merits i) These antennas have some similarities as of the conventional microwave antennas, as these cover a broader range of frequency from 100 MHz to 100 GHz, same is the case with these Micro strip antennas. ii)These are widely used in the handheld devices(wireless) such as pager, mobile phones, etc.
Rectangular Micro Strip Antenna Geometry:
Micro strip antenna consists of a very thin (t << λ0 where λ0 is the free – space wavelength) metallic strip (patch) placed a small fraction of a wavelength (h << λ0, usually 0.003λ0 ≤ h ≤ 0.05λ0) above a ground plane. The Micro strip patch designed so its pattern maximum is normal to the patch (broadside radiator). This is accomplished by properly choosing the mode (field configuration) of excitation beneath the patch. In designing Micro strip antennas, a number of substrate can be used. The dielectric constant of the substrate usually ranges of 2.2 ≤ εr ≤ 12. Thick substrates whose dielectric constant is in the lower range is the most desirable for antenna performance because they provide better efficiency, larger bandwidth, loosely bound fields for radiation into space, but at the expense of larger element size .
Design Requirement
There are three essential parameters for design of a coaxial feed rectangular microstrip Patch Antenna. Firstly, the resonant frequency ( f0 ) of the antenna must be selected appropriately. The frequency range used is from 2GHz -2.5GHz and the design antenna must be able to operate within this frequency range. Secondly, the dielectric material of the substrate (εr) selected for this design is 2.2. The dielectric constant of the substrate material is an important design parameter. Low dielectric constant is used in the prototype design because it gives better efficiency and higher bandwidth, and lower quality factor Q. The low value of dielectric constant increases the fringing field at the patch periphery and thus increases the radiated power. The proposed design has patch size independent of dielectric constant.