Ka-band wide axial ratio bandwidth high-gain circularly polarized microstrip array antenna
By designing an 8×8 Ka-band circularly polarized microstrip array antenna, employing a gradient cross-shaped coupling slot, a chamfered perturbation structure, and a first-order Koch fractal structure, combined with a sequential rotating feed network, the problems of insufficient bandwidth, low gain, and poor circular polarization purity in existing technologies were solved, achieving performance improvements of high gain, wide bandwidth, and low profile.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NANJING UNIV OF SCI & TECH
- Filing Date
- 2026-05-12
- Publication Date
- 2026-07-17
AI Technical Summary
Existing Ka-band circularly polarized microstrip array antennas suffer from insufficient bandwidth performance, difficulty in balancing gain and bandwidth, poor circular polarization purity, and poor array flexibility, making it difficult to meet the comprehensive performance requirements of high gain, wide bandwidth, and low profile.
Design an 8×8 scale right-hand circularly polarized microstrip array antenna. Employ a circularly polarized microstrip antenna element with a gradient cross-shaped coupling slot, a chamfered perturbation structure, and a first-order Koch fractal structure, combined with a sequentially rotating feed network to achieve high gain and wide bandwidth. The gradient slot extends the electromagnetic coupling and reduces the interference of the feed network on the radiation characteristics.
It achieves a relative impedance bandwidth of 21.4% and a relative axial ratio bandwidth of 23.8%, a peak gain of 22.65dB at 35GHz, a 3dB beamwidth of only 9.12°, an axial ratio as low as 0.6544dB, high circular polarization purity, low profile thickness, and is easy to integrate and expand.
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Figure CN122418331A_ABST