A Wideband and Highly Symmetric Multi-Port Parallel Combining Transformer Technology

作者：Yang Hao Shun^*; Chen Jau Horng; Chen Yi Jan Emery

来源：IEEE Transactions on Microwave Theory and Techniques, 2015, 63(11): 3671-3680.

DOI：10.1109/TMTT.2015.2482486

• Integrated passive device (IPD)
• power amplifier (PA)
• power combining transformer
• wideband

This paper presents a highly symmetric concentric vortical transformer (CVT) technology, which can be implemented with slab inductors. The CVT and several widely used planar transformer structures are analyzed to show the characteristic distinction of the CVT. The proposed CVT was developed in an integrated passive device technology along with the popular distributed active transformer (DAT) for comparison. Under the same real-part impedance transformation ratio at 2.4 GHz, the outer diameter of the CVT is only 48% of the DAT. Moreover, 89.4% transformation efficiency and 191% -1-dB fractional bandwidth are achieved by the CVT from a high coupling coefficient of 0.9. The symmetric nature of the CVT makes it capable of achieving far less variation than the DAT in resistance and reactance among multiple input ports when used for power combining.

• 出版日期2015-11
• 单位中国科学院电工研究所