研究目的
Investigating a novel dual-band circularly-polarized slot array antenna for LEO satellites communications, utilizing higher order modes for independent operation at different frequencies and achieving circular polarization with low dissipation losses.
研究成果
The novel slot antenna based on SIW technology demonstrates dual-band operation, independent band tuning, and circular polarization, making it suitable for portable transceivers in mini-satellites systems. The design achieves high directivity, low decoupling losses, and a main lobe aiming close to the end-fire direction, validated through simulations and theoretical models.
研究不足
The design may face challenges in minimizing interference between TX and RX slots, especially in ensuring that the radiation from TX slots does not affect the RX couple. Additionally, achieving high directivity and low decoupling losses for circular polarization requires precise tuning and optimization.
1：Experimental Design and Method Selection:
The antenna design utilizes Substrate Integrated Waveguide (SIW) technology to implement a dual-band circularly-polarized slot array antenna. Higher order modes (TE10 and TE20) are exploited to place slots at points where current distributions are null for the fundamental mode, enabling independent operation at different frequencies.
2：Sample Selection and Data Sources:
The design targets frequency bands commonly used in cubesat constellations, specifically 10.7–11.7 GHz for RX (down-link) and 14–14.5 GHz for TX (up-link).
3：7–7 GHz for RX (down-link) and 14–5 GHz for TX (up-link).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The antenna and feeder are designed using SIW with FR-4 substrate (εr = 4.4). A 3-layer stack-up is used for the feeding system, incorporating a Band-Pass-Filter (BPF) and a 180°-phase shifter.
4：4). A 3-layer stack-up is used for the feeding system, incorporating a Band-Pass-Filter (BPF) and a 180°-phase shifter.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The design involves placing slots to be excited by TE10 and TE20 modes for RX and TX bands, respectively. A matching load termination is used to generate the required travelling wave for circular polarization. The feeder system includes transitions from microstrip to SIW and a phase shifter for mode TE
5：Data Analysis Methods:
Numerical methods and appropriate simulators are used for computations and validation of the design, including return losses and array factor radiation patterns.
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