Wideband circularly polarized high accuracy survey active antenna for global navigation satellite systems applications

IF 1 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Microwave and Optical Technology Letters Pub Date : 2024-09-20 DOI:10.1002/mop.34291

Jia Wei, Shaowei Liao, Quan Xue, Wenquan Che

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引用次数: 0

Abstract

This letter presents a new circularly polarized (CP) active antenna for global navigation satellite systems (GNSS) operating in the L1-band (1.164–1.28 GHz) and L2-band (1.525–1.615 GHz). The active antenna consists of a passive antenna and a two-channel low-noise amplifier (LNA) circuit. To achieve wideband coverage of the L1/L2 bands while maintaining a low profile, a new electroplating process is utilized in fabricating the passive antenna. Additionally, to realize CP performance, the passive antenna is sequentially fed by four ports with a wideband feeding network. To minimize phase variations, a 90° phase shifter loaded with open-short-stub is integrated into the feeding network. Furthermore, to improve noise immunity, out-of-band rejection, and amplify GNSS signals, the LNA circuit cascades two-stage dielectric bandpass filters and three-stage LNAs. Consequently, the circuit features a low noise figure of below 1.65 dB, a maximum out-of-band rejection level of 60 dB, and a stable active gain of 30 dB. The performance of the active antenna is evaluated in an outdoor open field using a GNSS receiver.

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应用于全球导航卫星系统的宽带圆极化高精度勘测有源天线

本文介绍了一种新型圆极化（CP）有源天线，适用于在 L1 波段（1.164-1.28 GHz）和 L2 波段（1.525-1.615 GHz）工作的全球导航卫星系统（GNSS）。有源天线由一个无源天线和一个双通道低噪声放大器（LNA）电路组成。为了实现 L1/L2 波段的宽带覆盖，同时保持低矮的外形，在制造无源天线时采用了新的电镀工艺。此外，为实现 CP 性能，无源天线通过宽带馈电网络由四个端口依次馈电。为了最大限度地减少相位变化，馈电网络中集成了一个装有开放式短存根的 90° 移相器。此外，为了提高抗噪能力、带外抑制能力并放大 GNSS 信号，低噪声放大器电路级联了两级介质带通滤波器和三级低噪声放大器。因此，该电路具有低于 1.65 dB 的低噪声系数、60 dB 的最大带外抑制水平和 30 dB 的稳定有源增益。在室外露天场地使用全球导航卫星系统接收器对有源天线的性能进行了评估。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Microwave and Optical Technology Letters 工程技术-工程：电子与电气

CiteScore

3.40

自引率

20.00%

发文量

371

审稿时长

4.3 months

期刊介绍： Microwave and Optical Technology Letters provides quick publication (3 to 6 month turnaround) of the most recent findings and achievements in high frequency technology, from RF to optical spectrum. The journal publishes original short papers and letters on theoretical, applied, and system results in the following areas. - RF, Microwave, and Millimeter Waves - Antennas and Propagation - Submillimeter-Wave and Infrared Technology - Optical Engineering All papers are subject to peer review before publication