Enterprises

This project focuses on the application of a dual-band (12 GHz band 及 28 GHz band) narrow-beam wide-array antenna for satellite ground receiving stations. The primary objective is to enhance signal reception performance while ensuring high gain, low side-lobe levels, and good frequency selectivity, in order to accommodate different satellite communication bands, such as the Ku-band and Ka-band. By optimizing the antenna structure and array configuration, the overall communication quality and system reliability can be improved.
The main design considerations of this study are as follows:
1. Antenna Architecture Design
The antenna structure will adopt a microstrip array antenna, which offers advantages such as compact size, light weight, and ease of fabrication and integration, making it suitable for satellite ground receiving systems.
2. Dual-Band Operation Design
To achieve dual-band operation, this study will employ different resonant modes so that a single antenna structure can resonate at two target frequency bands simultaneously, meeting the requirements of dual-band satellite communication.
3. Narrow Beam and Wide Array Design
The beamwidth will be controlled by adjusting the number and arrangement of antenna elements in the array to achieve a narrow-beam characteristic and improved directivity. In addition, sparse array techniques will be utilized to reduce the number of antenna elements while maintaining high gain and narrow beam performance.
4. Side-Lobe Suppression
To reduce the impact of side lobes on signal quality, Chebyshev amplitude weighting will be applied in the array excitation distribution to effectively suppress side-lobe levels and enhance signal reception quality.
5. Fabrication and Material Selection
In terms of material selection, low-loss microwave substrates (such as Rogers RT/duroid® 5880) will be adopted to reduce transmission and insertion losses. Furthermore, a hybrid design incorporating metallic and dielectric materials will be used to improve frequency selectivity and impedance matching characteristics.

Through the above design considerations, this study aims to develop a high-performance dual-band microstrip array antenna architecture suitable for satellite ground receiving systems, thereby improving the signal reception capability and overall performance of satellite communication systems.

This project proposes the design of a circularly polarized array antenna for satellite downlink Ku-band applications (10.7–12.7 GHz). The antenna employs a dual H-shaped slot aperture-coupled feeding structure as the main architecture. Wideband operation is achieved by optimizing the parameters of the H-shaped slots, air layer, and tuning stubs. The H-shaped slots are arranged in an orthogonal configuration, where two orthogonal modes with a 90° phase difference are utilized to generate circular polarization. The orthogonal arrangement also helps improve the polarization isolation between the two modes. For the array design, the antenna elements are rotationally arranged to form a 2 × 2 array, enabling the antenna to exhibit both structural rotation and phase rotation characteristics. In terms of the feeding network, one polarization employs sequential feeding to improve circular polarization performance, while the other polarization adopts a direct feeding approach for performance verification. Simulation results show that the proposed antenna has overall dimensions of 58 × 58 × 9.6 mm³, with an operating bandwidth covering 10.7–12.7 GHz. Within the operating band, the half-power beamwidth (HPBW) ranges from approximately 25° to 36°. Under the sequential feeding configuration, the antenna achieves a gain of 9–11.24 dBi, and the axial ratio (AR) remains below 3 dB, indicating good circular polarization performance.