一种高性能功率放大器-圆极化天线的一体化设计

Integrated Design of a High-performance Power Amplifier-Circularly Polarized Antenna

中文关键词:  功放-圆极化天线一体化  圆极化天线  功率附加效率  轴比带宽

英文关键词:power amplifier-circular polarization antenna integration  circularly polarized antenna  power-added efficiency  axial ratio bandwidth

中文摘要:

      本文设计了一种具有圆极化辐射特性的高性能功率放大器-天线一体化电路。 通过直接优化圆极化天线的输入阻抗,使之与消除输出匹配网络的功放电路直接集成。 这种无缝集成方式不仅有效减少了插入和失配损耗以及整体电路尺寸,而且提高了整体的性能。 采用的圆极化天线由矩形贴片和改进的地平面组成,通过在地平面上增加垂直短截线和切割水平缝隙,增强了天线的3 dB 轴比带宽。 为了验证,设计、制造和测量了工作在3. 4 GHz~ 3. 6 GHz 的一体化电路原型。 实验结果显示,功放-圆极化天线一体化电路在工作频带内的功率附加效率(PAE)超过60%,且3 dB 轴比带宽达到320 MHz(相对于 3 500 MHz 的中心频率为 9. 1%)。 相较于传统的级联设计,PAE 提高了 8. 5%,3 dB 轴比带宽也得以改善。

英文摘要:

      A high-performance power amplifier-antenna integrated circuit with circularly polarized radiation characteristics is designed. By directly optimizing the input impedance of the circularly polarized antenna, it is directly integrated with the power amplifier circuit without the output matching network. This seamless integration not only decreases insertion loss and mismatch loss, but also effectively reduces circuit size and improves overall performance. The circularly polarized antenna is composed of a rectangular patch and a modified ground plane. The 3 dB axial ratio bandwidth of the antenna is enhanced by adding vertical stubs and cutting horizontal slots in the ground plane. For verification, an integrated circuit prototype operating at 3. 4 GHz~ 3. 6 GHz is designed, fabricated, and measured. The experimental results show that the power-added efficiency (PAE) of the power amplifier-circularly polarized antenna integrated circuit exceeds 60% in the operating frequency band, and the 3 dB axial ratio bandwidth reaches 320 MHz (9. 1% for the center frequency of 3 500 MHz). Compared with the traditional cascaded design, the PAE is im-proved by 8. 5%, and the 3 dB axial ratio bandwidth is also improved.