Wideband filtering antenna loading U-shaped parasitic patches based on characteristic mode analysis
Abstract A wideband filtering antenna loading with U-shaped parasitic patches (UPP) is proposed by the characteristic mode analysis (CMA). The antenna is consisted of two dielectric substrates, one of which is printed with an eight-sawteeth patch, four single-sawteeth patches and two pairs of U-shap...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-03-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-92442-6 |
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| Summary: | Abstract A wideband filtering antenna loading with U-shaped parasitic patches (UPP) is proposed by the characteristic mode analysis (CMA). The antenna is consisted of two dielectric substrates, one of which is printed with an eight-sawteeth patch, four single-sawteeth patches and two pairs of U-shaped parasitic patches. The sawteeth structures enable the two distinct characteristic modes to be closer with a smaller frequency space while allowing them to coexist within the operating frequency band, significantly enhancing the bandwidth. The two pairs of UPP can generate low-frequency and high-frequency radiation nulls, respectively. Utilizing CMA, potential modal nulls are identified at 4 GHz in the low stopband and at 7.5 GHz in the high stopband. Upon excitation with an L-shaped probe, the antenna exhibits radiation nulls precisely at 4 GHz and 7.41 GHz. The antenna’s dimensions are 0.94λ 0 × 0.94λ 0 × 0.066λ 0 (50 mm×50 mm×2.5 mm), where λ 0 represents the wavelength of the center frequency in free space. The measured impedance bandwidth with |S11| below − 10 dB is 26.38% (5 GHz to 6.52 GHz). The gain in the operational bandwidth is fluctuated from 7.21 dBi to 7.98 dBi, while the out-of-band suppression is reached 12.3 dB at a low frequency band and 17.8 dB at a high frequency band. Within the bandwidth range, the cross-polarization level remains under − 31 dB. The proposed antenna characterized by broadband, low cross-polarization, and low-profile, can be widely applied in 5G communication. |
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| ISSN: | 2045-2322 |