Design of 10-12 GHz Reversed Marchand Balun with Planar Inverted-F Antenna Using GIPD Technology

• Main Authors: Yu-Hsiang Huang, 黃昱翔
• Other Authors: Lih-Tyng Hwang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/17414650703699947351

碩士 === 國立中山大學 === 通訊工程研究所 === 101 === In most of the RF front-end of a receiver, differentially driven low noise amplifier is usually used to increase the signal-to-noise ratio, and at the same time, to reduce the common noise signals. However, most of the antennas are single-ended at the output, thus cause mismatch between the amplifier and the antenna. To alleviate the problem, a balun is attached to the antenna. Therefore, after the antenna receives the signals, the balun converts the single-ended signal to the differential signals directly fed into differential low noise amplifier. In this thesis, a reversed marchand balun is designed. The balun is a passive component based on inductive coupling. In order to increase the Q-factor of the balun, Glass Integrated Passive Devices (GIPD) technology provided by National Chip Implementation Center was applied. This technology not only improves the Q-factor but also increases the stability of the performance. Finally, we integrated the designed balun with a PIFA (Planar Inverted-F Antenna) on GIPD. Co-design simulation is conducted to evaluate the performance of the balun and PIFA combination. The size of the balun is 1.5×0.9 mm2. The measurement results demonstrate that the balun achieves less than 1.7dB insertion loss throughout the 10–12 GHz operation bandwidth. The phase and amplitude imbalances are less than 5° and 0.9 dB, respectively. The common-mode rejection ratio is greater than 23dB. The combination of balun and PIFA achieves 500MHz bandwidth.