Design and analysis of single balanced diode mixer for UWB applications

• Main Author: Al-Gumaei, Mohammed Yahya Qaid
• Format: Thesis
• Language: English; English
• Published: 2018
• Subjects: T Technology (General); TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utem.edu.my/id/eprint/23330/1/Design%20And%20Analysis%20Of%20Single%20Balanced%20Diode%20Mixer%20For%20UWB%20Applications.pdf; http://eprints.utem.edu.my/id/eprint/23330/2/Design%20and%20analysis%20of%20single%20balanced%20diode%20mixer%20for%20UWB%20applications.pdf; http://eprints.utem.edu.my/id/eprint/23330/; http://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=112302
• Institution: Universiti Teknikal Malaysia Melaka

In wireless communication systems,the development of ultra-wideband (UWB) Radio Frequency (RF) front-end sub-components (e.g. amplifiers,filters,switches,antennas and mixers) are highly desired,and they were developed to support several RF front-end systems.The main function of the RF mixer is frequency conversion,where the low conversion loss is one of the key parameters in RF mixer design.Mixer also act as critical components in modern RF and Microwave systems.The unique of the mixer is it can convert RF power from one frequency into another frequency.There are various forms of RF mixer designs which can be used to obtain a good conversion loss and good isolation where these mixer designs have trade off in performance and complexity.Hence,this research proposes an UWB Single Balanced Schottky diode mixer design using Coupled Line and Branch Line baluns for applications of ultra-wideband in 3 to 10 GHz frequency range.Basically,an UWB Single Balanced Schottky diode mixer was designed using two different baluns (Coupled Line and Branch Line).The usage of these two baluns aims to improve the bandwidth and producing a good performance in simple and inexpensive way.The used baluns are determined using a simple mathematical model where it can be combined from different multi sections of Coupled Line and Branch Line to achieve the desired bandwidth.The key advantage of the proposed UWB Single Balanced diode mixer with Coupled Line and Branch Line baluns is a wider bandwidth with low conversion loss and high isolation. Besides,low cost and small size as these mixers was designed in microstrip transmission line.As a result,the simulated and measured results showed conversion loss less than 19 dB and isolation of 50 dB over the frequencies between 3 to 10 GHz.Despite low conversion loss and high isolation performance, the proposed Single Balanced diode mixer (with Coupled Line and Branch Line baluns) used only two Schottky diodes compared to Double Balanced diode mixer to achieve good performance over UWB applications.