研究目的
To design and evaluate a dual-band and dual-circularly polarized offset parabolic reflector antenna for receiving satellite broadcasting services in the 12-GHz and 21-GHz bands with right- and left-hand circular polarizations.
研究成果
The fabricated dual-band dual-circularly polarized offset parabolic reflector antenna successfully received 12-GHz and 21-GHz band signals from satellites with gains of approximately 34 dBi and 36 dBi, aperture efficiencies of about 60% and 30%, VSWR less than 1.9, and XPD greater than 20 dB. It demonstrated sufficient performance for satellite broadcasting reception, confirming its capability as a dual-polarized antenna in both frequency bands. Future work should focus on reducing feeding losses and improving fabrication precision.
研究不足
The measured VSWR in the 12-GHz band slightly exceeded the target (1.9 vs. 1.5), likely due to substrate thickness variations. Gain in the 21-GHz band was lower than target (36 dBi vs. 38 dBi) due to feeding losses. XPD was below the target of 25 dB in some cases, attributed to fabrication errors in feed lines and hybrid couplers. The antenna design is complex and may require further optimization for mass production.
1：Experimental Design and Method Selection:
The study involved designing a dual-band dual-circularly polarized offset parabolic reflector antenna fed by microstrip antenna arrays. Theoretical models and electromagnetic simulations using CST MW Studio were employed for design optimization.
2：Sample Selection and Data Sources:
A prototype antenna was fabricated with a 50-cm diameter offset parabolic reflector and multilayer microstrip antenna arrays. Measurements were conducted using a spherical near-field antenna measurement system.
3：List of Experimental Equipment and Materials:
Equipment included a spectrum analyzer (Keysight N9010A and N9030A), low-noise block converters (LNBs), and substrates made of polytetrafluoroethylene (PTFE). Materials included aluminum for the reflector and copper for feed lines.
4：Experimental Procedures and Operational Workflow:
The antenna was tested for VSWR, gain, aperture efficiency, XPD, and radiation patterns. An experiment was performed to receive signals from broadcasting satellites (BSAT and JCSAT) at 110 degrees East orbital position.
5：Data Analysis Methods:
Data were analyzed using simulation software (CST MW Studio, GRASP) and compared with ITU-R recommendations (BO.1213, BO.1900) for performance evaluation.
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