Research
Study of Microstrip Slotted Antenna for Bandwidth Enhancement
Two printed wide-slot antennas with E-shaped patches and slots, for broadband applications, are proposed. They are fed by a coplanar waveguide (CPW) and a microstrip line with almost the same performances. Detailed simulation and experimental investigations are conducted to understand their behavior and optimize for broadband operation. Good agreement between the measurement and simulation has been achieved. The impedance bandwidths, determined by 10-dB reflection coefficient, of the proposed slot antennas fed by microstrip line and CPW are examined from both measurement and simulation. We have obtained the large operating bandwidth by choosing suitable combinations of feed and slot shapes. In order to achieve wider operation bandwidth both of the designed antennas have round corners on the wide slot and patch. Meanwhile, the proposed antennas exhibit almost omnidirectional radiation patterns, relatively high gain, and low cross polarization. A comprehensive numerical sensitivity analysis has been done to understand the effects of various dimensional parameters and to optimize the performance of the designed antennas. Results for reflection coefficient, far-field E and H-plane radiation patterns, and gain of the designed antennas are presented and discussed. At the end, we compare the simulated and measured results and found the enhancement of bandwidth of E- shape microstrip antenna.
Design and Analysis of Rectangular Microstrip Antenna with PBG Structure for Enhancement of Bandwidth
Modern wireless systems are placing greater emphasis on antenna designs for future development in communication technology because of antenna being the key element in the whole communication system. The microstrip antenna in a system serves as the transducer between the controlled energy residing within the system and the radiated energy existing in free space. This antenna is very good for wireless communication due to it’s light weight, low volume and low profile planer configuration which can be easily made conformal to host surface. Additionally, some of it’s characteristics like low fabrication cost, supportive nature for both linear and circular polarization,and low sensitivity to manufacturing tolerance make this antenna very important for next generation.However, a major disadvantage of this type of antenna is that it has very narrow band width. In this paper, we remove such type of disadvantage of rectangular microstrip antenna by adding a PBG structure. We first describe briefly the properties of the microstrip antenna & photonic band gap structure and after this we design a rectangular microstrip antenna with PBG structure using cavity model method. Then the results are simulated with IE3D based on MOM method. At the end, we compare the simulated and measured results. We find that the bandwidth of microstrip antenna is enhanced by adding a PBG structure .
