Microwave Circuits and Systems for UWB Applications
Shaimaa Abdelaziz Mahmoud Osman;
Abstract
Ultra-wideband (UWB) applications have captured attention as a high-speed secured wireless communications with extremely low power consumption. There are many challenges when dealing with these new applications. One of them is how to design a power divider (PD) that can perform effectively in the entire UWB frequency range from 3.1 GHz to 10.6 GHz. This thesis mainly focused on designing power dividers for UWB systems. The performance criteria of power divider such as insertion loss, output ports isolations and return loss are discussed as well as PD different design methodologies and technologies. Different techniques to enhance the performance of power divider are investigated and tested, such as bandwidth broadening, isolation enhancement and matching improvement.
A novel N-way power divider design for UWB systems is developed. The design is realized using two cascaded sections of Wilkinson PDof equal characteristic impedances and unequal electrical lengths with inserted open stub on each section to enhance the isolation, matching and to broaden the bandwidth. The analytical solution for the designed N-way power dividers is based on two approaches namely “Even-Odd Mode Method” and the “ABCD Matrix” Method. Simple design equations and guidelines are proposed to facilitate the design procedure and limit the usage of CAD simulators and optimizers. To verify the proposed design methodology, 2-way, 3-way and 4-way PD for UWB are designed, simulated and implemented.
The 2-way power divider for UWB systems is tested using EM-Circuit Co-Simulation then fabricated, measured and compared with similar published PD. It has an isolation of better than 13.5 dB within the entire UWB frequency band and has a compact area of 22 * 15 mm2. Measurement and simulation results agrees well, which verifies the proposed design equations as well as the design procedure. In addition, the proposed circuit is compared to conventional published ones to show the enhancement percentage in different performance parameters, where the 2-way proposed circuit achieves23% isolation enhancement and better than 45 % of return loss enhancement. The 3-way and 4-way power dividers design equations are introduced along with the suggested planar microstrip implementation. Another 4-way power divider is proposed using three 2-way PD. This method is more realistic in planar microstrip fabrication. This proposed 4-way PD is fabricated, measured and compared to published available ones. It has an isolation of better than 12.5 dB and a return loss of better than 10 dB through the whole UWB range. Furthermore, the exceeded insertion loss is less than 1.8 dB and the occupied area is 40*34 mm2. Finally, the proposed structures as well as the developed design procedure are very useful for UWB applications.
A novel N-way power divider design for UWB systems is developed. The design is realized using two cascaded sections of Wilkinson PDof equal characteristic impedances and unequal electrical lengths with inserted open stub on each section to enhance the isolation, matching and to broaden the bandwidth. The analytical solution for the designed N-way power dividers is based on two approaches namely “Even-Odd Mode Method” and the “ABCD Matrix” Method. Simple design equations and guidelines are proposed to facilitate the design procedure and limit the usage of CAD simulators and optimizers. To verify the proposed design methodology, 2-way, 3-way and 4-way PD for UWB are designed, simulated and implemented.
The 2-way power divider for UWB systems is tested using EM-Circuit Co-Simulation then fabricated, measured and compared with similar published PD. It has an isolation of better than 13.5 dB within the entire UWB frequency band and has a compact area of 22 * 15 mm2. Measurement and simulation results agrees well, which verifies the proposed design equations as well as the design procedure. In addition, the proposed circuit is compared to conventional published ones to show the enhancement percentage in different performance parameters, where the 2-way proposed circuit achieves23% isolation enhancement and better than 45 % of return loss enhancement. The 3-way and 4-way power dividers design equations are introduced along with the suggested planar microstrip implementation. Another 4-way power divider is proposed using three 2-way PD. This method is more realistic in planar microstrip fabrication. This proposed 4-way PD is fabricated, measured and compared to published available ones. It has an isolation of better than 12.5 dB and a return loss of better than 10 dB through the whole UWB range. Furthermore, the exceeded insertion loss is less than 1.8 dB and the occupied area is 40*34 mm2. Finally, the proposed structures as well as the developed design procedure are very useful for UWB applications.
Other data
| Title | Microwave Circuits and Systems for UWB Applications | Other Titles | دوائر وأنظمة الميكروويف الخاصة بتطبيقات المدى فائق الاتساع | Authors | Shaimaa Abdelaziz Mahmoud Osman | Issue Date | 2015 |
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