2026-10-15T00:01:25Z https://www.scidb.cn/oai

10.57760/sciencedb.space.03765 2026-07-07T10:43:10Z

2026-07-07 A Spaceborne GNSS Oblique-Beam Array Antenna With Wideband High Efficiency and Deep Adjacent-Band Filtering doi:10.57760/sciencedb.space.03765 en First, three-dimensional dual-path coupling excitation (3D-DPCE) is proposed to overcome the limited antenna effective radiating aperture excitation of conventional 2D planar coupled feeding, which mainly relies on near-field capacitive coupling [26]. By introducing a 3D tilted feed patch, the feed structure simultaneously provides near-field coupling and far-field radiation capability, forming two spectrally complementary excitation paths, namely near-field capacitive coupling (NFCC) and radiated-field coupling (RFC). These paths drive a larger region of the radiating aperture over a wider frequency band, thereby resolving the bandwidth limitation under low-profile and lightweight constraints.Second, dual-resonant reactance compensation (DRRC) theory is proposed as a new filtering-antenna design method. DRRC introduces a non-radiating energy-storage mode (NESM) with complementary reactance in the vicinity of the radiating resonant mode (RRM), forming a dual-resonant response composed of a radiating resonance and an energy-storage resonance. In the passband, the NESM compensates for excessive reactance, reduces reactive power, and improves efficiency. In the stopband, the NESM confines surface currents to continuous metallic-boundary regions and suppresses far-field radiation, thereby inserting an efficiency zero (EZ) into the efficiency spectrum and realizing controllable AB filtering. For different impedance characteristics, stopband locations, and efficiency-enhancement regions, DRRC is classified into independent and coupled integration approaches, with corresponding efficiency–impedance theoretical maps, a design procedure, and selection criteria. Unit-level validation shows a total efficiency higher than 85% over a fractional bandwidth exceeding 36%, together with more than 16 dB suppression in the target stopband, resolving the difficulty of reconciling wideband high efficiency with AB filtering. Furthermore, using a frequency-dispersive passive phase-gradient network, a 1 × 4-element, 22° oblique-beam (OB) Global Navigation Satellite System (GNSS) array antenna is developed. Measurements show that the array achieves a total efficiency of >75% and an axial ratio (AR) of <3 dB over 1.15–1.65 GHz, and a 22 dB suppression depth in the 1.69–1.71 GHz target stopband. With an overall size of 2.4λ0 × 0.67λ0 × 0.13λ0 and a mass of 762 g, the proposed array verifies the effectiveness of the proposed theory for remote-sensing receiving antennas. Filtering antenna; lightweight; low profile; oblique-beam array antenna; spaceborne antenna; wideband high efficiency. zhang hao Du Feifei Sun Yueqiang PUBLIC https://opendatacommons.org/licenses/by/1-0/ dataset Science Data Bank