A Wideband Isolated Real-to-Complex Impedance Transforming Uniplanar Microstrip Line Balun for Push–Pull Power Amplifier
A Wideband Isolated Real-to-Complex Impedance Transforming Uniplanar Microstrip Line Balun for Push–Pull Power Amplifier
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DOI：
10.1109/tmtt.2020.3019003
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发表时间：
2020-09
影响因子：
4.3
通讯作者：
Md Hedayatullah Maktoomi;H. Ren;M. Marbell;Victor Klein;Richard Wilson;B. Arigong
中科院分区：
文献类型：
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作者：
Md Hedayatullah Maktoomi;H. Ren;M. Marbell;Victor Klein;Richard Wilson;B. Arigong
在本文中，提出了三个端口单皮微带线Balun将平衡的复杂负载终止转换为50- $ \ omega $不平衡的端口阻抗。传输线在结构中间的分支线之间插入。对均匀模式电路进行了分析，以扩大所提出的实物 - 复合阻抗的带宽。 ）。在拟议的Balun的实验中，使用阻抗轨迹轨迹微饰面的Balun，模拟和测量结果与彼此相吻合，从而证明了设计概念。增益为10.2–12.2 dB，输出功率为42.7–44.7 dbm，在1.8–2.7 GHz的频率范围内，耗时效率为59.8％–74.6％。
In this article, a three-port uniplanar microstrip line balun is proposed to transform the balanced complex load termination to 50- $\Omega $ unbalanced port impedance. The proposed device is designed based on a symmetric four-port network with an open-ended transmission line inserted between branch lines in the middle of structure. To improve the isolation and match the complex termination, a resistive network is proposed and inserted between the two balanced ports. In addition, the theoretical analysis is carried out for the even and odd mode circuits to expand the bandwidth of the proposed real–complex impedance transforming balun. With the proposed design theory, the impedance trajectory follower splitting and combining baluns are designed for wideband push–pull power amplifier (PPPA). To verify the design concept, first, a real–complex impedance transforming uniplanar microstrip line balun is designed and characterized at 1 GHz. Then, a prototype for the wideband PPPA with impedance trajectory follower microstrip baluns is designed, fabricated, and validated in experiment. For the proposed balun, the simulated and measured results agree well with each other to prove the design concept. From the experimental results, the PPPA with the proposed balun shows a gain of 10.2–12.2 dB, output power of 42.7–44.7 dBm, and a drain efficiency of 59.8%–74.6% within the frequency range of 1.8–2.7 GHz.