Design Of High Gain Antenna With Harmonic Suppression Using T-Shape DGS And Spurline

• Main Author: Zainol, Nurzaimah
• Format: Thesis
• Language: English; English
• Published: 2016
• Subjects: T Technology (General); TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utem.edu.my/id/eprint/18604/; http://library1.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000100660

The use of novel antenna with harmonic suppression is an attractive idea. There are many applications that could benefit from this such as cellular mobile radio, factory monitoring and biomedical applications. The potential for highly efficient of harmonic suppression at harmonic frequency is offered by antenna itself. Conventionally, defected ground structure (DGS), electromagnetic band gap (EBG) and stub have been used for stop band characteristics. However, there are also challenges that arise from these antenna with harmonic suppression. One of them is the problem of fabricating the antenna which increase the cost and the other one they require large amount of circuit size and consequently require similar stop band characteristics which restrict their use in many important applications. The resulting antenna with harmonic suppression was ordinary one and have low gain at resonant frequency. Thus, a high gain antenna with harmonic suppression have gained a considerable interest over the past few years due to their advantages such as low cost, ease of fabrication and not complex. Therefore, this thesis presents a high gain antenna with harmonic suppression which produce broadband harmonic suppression with capability to suppress undesired harmonic signals from 3 GHz up to 8 GHz. These antenna with harmonic suppression are based on microstrip structure of T-shape DGS and spur line low pass filters by employing the perturbation theory, in which the dielectric properties of the substrate used affect the radiation characteristics of antenna. The antenna are designed at operating frequency of 2.45 GHz with harmonic suppression entirely second and third order. As a results, the final design of antenna has achieved a very good return loss which peaked up to -33.44 dB at 2.45 GHz operating frequency. In addition, it has an extremely high gain which achieved a 14.20 dB with a strong directional radiation pattern; and total efficiency achievement of the 2x2 antenna array is up to 98.86%. Besides that, the harmonic signals have been suppressed effectively from -29.19 dB to -7.77 dB at frequency of 3.24 GHz and achieved a broadband harmonic suppression. Experimentally, the measured· and simulated results are found in an excellent agreement and achieved high gain compared to those in literatures which has an average gain of 1 dB to 6 dB for the same applications. The antenna is designed and simulated by using Computer Simulation Technology (CST) Studio Suite. The presented work in this thesis consists of defining the characterizations for all subsystems which are preceded with optimized design process. It is believed that these high gain antenna with harmonic suppression would lead for a promising solution for RF/Microwave energy transfer particularly in suppressing the harmonic that degrade the system performance.