Ka-Band Near-Field-Focused 2-D Steering Antenna Array With a Focused Rotman Lens

Wu, Ya Fei; Cheng, Yu Jian; Huang, Zi Xuan

doi:10.1109/tap.2018.2856113

Cited by 100 publications

(19 citation statements)

References 35 publications

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“…x z , on the ' 0 y  plane to express 1 3 A A by [1], [2], [13], [14], [22] 2 3 ( sin , cos ) ( sin , cos ) (0, )…”

Section: Theoretical Tfrl-bfn Operational Mechanismmentioning

confidence: 99%

“…Two-dimensional (2-D) trifocal Rotman lenses [1]- [26] and its extension as multi-focal bootlace lens have been widely used as an effective beamforming network (referred to as a TFRL-BFN, hereafter) to excite planar arrays of antennas for multibeam radiations [2]- [7]. The operational mechanism [1], [2], [5]- [7], [13], [14] first builds three focal points for beam excitation. The profile is then determined by using geometric optic (GO) ray path lengths to obtain three sets of equal-path length equations via the antenna array to the directional beams pointing to three symmetric directions [1], [2], [5]- [7], [22].…”

Section: Introductionmentioning

confidence: 99%

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Development of 2-D Generalized Tri-Focal Rotman Lens Beamforming Network to Excite Conformal Phased Arrays of Antennas for General Near/Far-Field Multi-Beam Radiations

Chou

Torrungrueng

2021

IEEE Access

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In this paper, we present a general closed-form solution of trifocal Rotman lens beamforming network (TFRL-BFN) design to excite a conformal phased array of antennas for multibeam radiations. This TFRL-BFN is a two-dimensional (2-D) configuration and is realizable in a dielectric substrate sandwiched by a pair of metal parallel-plates. In the development, instead of employing the geometric optic (GO) ray paths external to the Rotman lens to form an equal-phase wavefront by equal path lengths for directional beam radiation, we consider the phase need of antenna array excitation as the design target of TFRL-BFN. As a result, the TFRL-BFN concept can be extended to treat conformal arrays of antennas with wellplanned excitation schemes, ranging from conventional near-and far-field focus multibeam radiations, as well as multibeam with shaped patterns. Basic theoretical concepts and foundations are presented with simulation and measurement examples to demonstrate the phase production characteristics of this TFRL-BFN. When used to feed a conformal array of antennas, the resulting radiation characteristics validate this TFRL-BFN generalization concept's feasibility.

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“…x z , on the ' 0 y  plane to express 1 3 A A by [1], [2], [13], [14], [22] 2 3 ( sin , cos ) ( sin , cos ) (0, )…”

Section: Theoretical Tfrl-bfn Operational Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of 2-D Generalized Tri-Focal Rotman Lens Beamforming Network to Excite Conformal Phased Arrays of Antennas for General Near/Far-Field Multi-Beam Radiations

Chou

Torrungrueng

2021

IEEE Access

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“…The focus scanning ability along both orthogonal directions of the focal plane are achieved by phase control and frequency shift, respectively. A further layout that combines the frequency scanning in one plane with a phase shift in the orthogonal plane is in [30], where a Ka-band single-layer NFF SIW (Surface Integrated Waveguide) array antenna is realized. There, a set of parallel NFF leaky-wave SIW linear slot antennas are fed through a focused Rotman lens.…”

Section: Novel Layouts and Technolgiesmentioning

confidence: 99%

Again on Spatial Focusing and Shaping of the Electromagnetic Field in the Antenna Radiative Near-Field Region

Nepa

Manara

Pino

et al. 2019

2019 URSI International Symposium on Electromagnetic Theory (EMTS)

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“…A hexagonal configuration with large element spacing is presented in [19]. For the near-field case, an array antenna with the triangular topology is used to optimise the focusing performance [20]. It proves the feasibility to realise a sparse near-field focusing sparse array antenna simply based on the array topology, which has been discussed briefly in [21].…”

Section: Introductionmentioning

confidence: 98%

Investigation of sparse near‐field focusing array antenna with different topologies

Yang

Cheng

2019

IET Microwaves, Antennas & Propagation

Self Cite

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The method to efficiently design a sparse near‐field focusing sparse array antenna is introduced here. First, the calculation model and analysis method of three array topologies including the square grid, the circular grid, and the regular triangular grid are established. The evaluation criterion is the lowest sparsity under the condition that the focusing performance of the sparse array approaches to that of a referenced focusing array with the element spacing of a half of one wavelength. After comparing the focusing performance of these array antennas with different grids, the circular‐grid array is the optimal one and selected to further discuss the influence of different topology parameters. The optimal sparse near‐field focusing array should have the constant distance between two adjacent rings and increase three elements compared with the last ring. Finally, the method based on the proposed selection criteria is employed to design a sparse near‐field focusing sparse array. The correctness of the method has been validated by the full‐wave simulated results.

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Ka-Band Near-Field-Focused 2-D Steering Antenna Array With a Focused Rotman Lens

Cited by 100 publications

References 35 publications

Development of 2-D Generalized Tri-Focal Rotman Lens Beamforming Network to Excite Conformal Phased Arrays of Antennas for General Near/Far-Field Multi-Beam Radiations

Development of 2-D Generalized Tri-Focal Rotman Lens Beamforming Network to Excite Conformal Phased Arrays of Antennas for General Near/Far-Field Multi-Beam Radiations

Again on Spatial Focusing and Shaping of the Electromagnetic Field in the Antenna Radiative Near-Field Region

Investigation of sparse near‐field focusing array antenna with different topologies

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