08-02-2013, 03:17 PM
Low Profile E-shape Microstrip Antenna with Electromagnetic Band Gap Structure for Bandwidth Enhancement
[attachment=50221]
INTRODUCTION
Objective of the Thesis
The demand of antenna is rapidly increasing recently due to varieties of wireless communication systems launched into the market; for instances, 2G/3G mobile services, marine or land vehicle navigations (GPS), wireless LANs access, remote sensors for monitoring systems, and many small devices embedded with Bluetooth, UWB, Zigbee, DVB etc. Among many types of antennas, they can be classified into two categories which are linearly-polarized and circularly-polarized antenna. For majorities of wireless applications, linearly polarized antenna is good enough for transmitting as well as for receiving RF signals. However, for satellite communication and high sensitivity systems like as GPS, satellite phone and the space-to-earth communication, then the circularly-polarized antenna must be used in order to maintain good capability of signal strength.
Microstrip patch antenna is widely used in microwave range for transmitting and receiving signals due to their small and conformal size, ease of fabrication and planar geometry. There have been different dielectric substrates used for the fabrication of microstrip patch antenna.
The aim of the thesis is to design and fabricate triangular microstrip patch antenna on six different substrates, which targets to use in satellite communication and study the effect of antenna dimensions length or side of equilateral triangle (a) and substrate parameters Return loss, VSWR, Gain, Directivity, Efficiency and Bandwidth. The height of the dielectric constant is kept constant (which is 1.5mm) and antenna is designed for X-band applications, so the resonant frequency chosen is 10 GHz.
Overview of Microstrip Patch Antenna
All communication devices which use free space as the medium of communication need antenna. Antenna is a transducer which coverts electrical energy into electromagnetic waves and radiate into space when used as a transmitter and receives electromagnetic waves and converts into electrical energy when used as receiver. In microwave range microstrip patch antennas are used. They are very useful in satellite communication as well. Microstrip patch antenna is one of the most preferred antenna structures due to their low profile and ease of fabrication. They have many applications, especially in wireless communication. However, the major disadvantage of the microstrip patch antenna is its narrow bandwidth. Lots of research work has been done in recent years to develop bandwidth enhancement techniques. MPA have different geometries such as rectangular, triangular, circular, etc.The dielectric substrates used are also different. By using different dielectric substrates on a fixed resonant frequency of 10 GHz and height of 1.5 mm. Different parameters such as VSWR, Return Loss, Antenna Gain, Directivity, Antenna Efficiency and Bandwidth is analyzed.
Scope of the Thesis
This work indicates that several shapes of substrates affect patch antenna performance. By seeing the results of this work the authors can get a fair idea of which shape should be preferred to fabricate microstrip patch antenna. They can have a broader way of choosing a substrate. L-Slot and Meandered shape gives better performance than the other shape. Polyester can be used to fabricate wearable textile antenna. Textile antennas are getting popular these days. A wearable antenna is meant to be a part of the clothing used for the communication purposes, which includes tracking and navigation purposes, mobile computing and public safety. As of today, Wi-Fi also known as WLAN has become a standard in most computers. Textile antennas are also very good for health perspective.
[attachment=50221]
INTRODUCTION
Objective of the Thesis
The demand of antenna is rapidly increasing recently due to varieties of wireless communication systems launched into the market; for instances, 2G/3G mobile services, marine or land vehicle navigations (GPS), wireless LANs access, remote sensors for monitoring systems, and many small devices embedded with Bluetooth, UWB, Zigbee, DVB etc. Among many types of antennas, they can be classified into two categories which are linearly-polarized and circularly-polarized antenna. For majorities of wireless applications, linearly polarized antenna is good enough for transmitting as well as for receiving RF signals. However, for satellite communication and high sensitivity systems like as GPS, satellite phone and the space-to-earth communication, then the circularly-polarized antenna must be used in order to maintain good capability of signal strength.
Microstrip patch antenna is widely used in microwave range for transmitting and receiving signals due to their small and conformal size, ease of fabrication and planar geometry. There have been different dielectric substrates used for the fabrication of microstrip patch antenna.
The aim of the thesis is to design and fabricate triangular microstrip patch antenna on six different substrates, which targets to use in satellite communication and study the effect of antenna dimensions length or side of equilateral triangle (a) and substrate parameters Return loss, VSWR, Gain, Directivity, Efficiency and Bandwidth. The height of the dielectric constant is kept constant (which is 1.5mm) and antenna is designed for X-band applications, so the resonant frequency chosen is 10 GHz.
Overview of Microstrip Patch Antenna
All communication devices which use free space as the medium of communication need antenna. Antenna is a transducer which coverts electrical energy into electromagnetic waves and radiate into space when used as a transmitter and receives electromagnetic waves and converts into electrical energy when used as receiver. In microwave range microstrip patch antennas are used. They are very useful in satellite communication as well. Microstrip patch antenna is one of the most preferred antenna structures due to their low profile and ease of fabrication. They have many applications, especially in wireless communication. However, the major disadvantage of the microstrip patch antenna is its narrow bandwidth. Lots of research work has been done in recent years to develop bandwidth enhancement techniques. MPA have different geometries such as rectangular, triangular, circular, etc.The dielectric substrates used are also different. By using different dielectric substrates on a fixed resonant frequency of 10 GHz and height of 1.5 mm. Different parameters such as VSWR, Return Loss, Antenna Gain, Directivity, Antenna Efficiency and Bandwidth is analyzed.
Scope of the Thesis
This work indicates that several shapes of substrates affect patch antenna performance. By seeing the results of this work the authors can get a fair idea of which shape should be preferred to fabricate microstrip patch antenna. They can have a broader way of choosing a substrate. L-Slot and Meandered shape gives better performance than the other shape. Polyester can be used to fabricate wearable textile antenna. Textile antennas are getting popular these days. A wearable antenna is meant to be a part of the clothing used for the communication purposes, which includes tracking and navigation purposes, mobile computing and public safety. As of today, Wi-Fi also known as WLAN has become a standard in most computers. Textile antennas are also very good for health perspective.