Fig. 1.
Fig. 2.
Fig. 3.
Knitting process parameters for HF antennas
| No. of mesh reflector materials | HF-1 Mesh HF-1 yarn | HF-2 Mesh HF-2 yarn | ||
|---|---|---|---|---|
| Knitted structure | reverse locknit structure | reverse locknit structure | ||
| Chain notation | Guide Bar 1 | Guide Bar 2 | Guide Bar 1 | Guide Bar 2 |
| 1-0/1-2// | 2-3/1-0// | 1-0/1-2// | 2-3/1-0// | |
| Threading ways | Full | Full | Full | Full |
| Let-of amount (mm/rack) | 2220 | 2370 | 2220 | 2690 |
| Machine speed (mm/min) | 150-300 | 150-300 | ||
Tensile properties of warp-knitted meshes
| Specimen specifications | Fracture strength (N) | Elongation at break (%) | |||
|---|---|---|---|---|---|
| LF-lmesh | Vertical | 100mmx30mm | Average value | 23.14 | 35.67 |
| CV% | 14.68 | 18.87 | |||
| Horizontal | 100mmx48mm | Average value | 17.79 | 96.13 | |
| CV% | 8.24 | 5.9 | |||
| LF-2 mesh | Vertical | 100mmx45mm | Average value | 29.30 | 52.23 |
| CV% | 6.73 | 7.64 | |||
| Horizontal | 100mmx40mm | Average value | 23.68 | 72.63 | |
| CV% | 3.18 | 12.07 | |||
| HF-1 mesh | Vertical | 100mmx25mm | Average value | 36.16 | 45.23 |
| CV% | 7.49 | 2.56 | |||
| Horizontal | 100mmxl5mm | Average value | 29.01 | 106.78 | |
| CV% | 7.98 | 2.45 | |||
| HF-2 mesh | Vertical | 100mmx25mm | Average value | 30.4 | 44.40 |
| CV% | 10.5 | 2.35 | |||
| Horizontal | 100mmx20mm | Average value | 25.93 | 126.10 | |
| CV% | 2.38 | 2.63 | |||
Specification of metallic yarns
| No. | LF-1 yarn | LF-2 yarn | HF-1 yarn | HF-2 yarn |
|---|---|---|---|---|
| Material | Nickel-plated stainless steel wire | Gold-plated molybdenum wire | Gold-plated molybdenum wire | Molybdenum wire |
| Diameter of monofilament (μm) | 30 | 27 | 17 | 16 |
| Number of monofilaments | 3 | 3 | 4 | 4 |
| Yarn linear density (tex) | 19.8 | 16.7 | 10.5 | 8.2 |
| Twist Coefficient αt | 3.7 | 3.4 | 2.7 | 2.4 |
Knitting process parameters for LF antennas
| No. of mesh reflector | LF-1 mesh | LF-2 mesh | ||
|---|---|---|---|---|
| Materials | LF-1 yarn | LF-2 yarn | ||
| Knitted structure | Open atlas tricot structure | Open atlas tricot structure | ||
| Chain notation | Guide Bar 1 | Guide Bar 2 | Guide Bar 1 | Guide Bar 2 |
| 1-0/1-2/2-3/2-1// | 2-3/2-1/1-0/1-2// | 1-0/1-2/2-3/2-1// | 2-3/2-1/1-0/1-2// | |
| Threading ways | 1*1* | 1*1* | 1*1* | 1*1* |
| Let-of amount (mm/rack) | 2330 | 2370 | 2875 | 2870 |
| Machine speed (mm/min) | 150-300 | 150-300 | ||
Yarn strength after conversion based on metallic warp-knitted meshes
| Mesh No. | Number of yarns in mesh | Strength of original yarn (N) | Strength of mesh (N) | Knitted yarn strength utilization factor (%) | |
|---|---|---|---|---|---|
| LF-1 | Vertical | 80 | 1.67 | 23.14 | 17.3 |
| Horizontal | 40 | 17.79 | 26.6 | ||
| LF-2 | Vertical | 80 | 3.89 | 29.30 | 9.4 |
| Horizontal | 40 | 23.68 | 15.2 | ||
| HF-1 | Vertical | 80 | 2.16 | 36.16 | 20.9 |
| Horizontal | 40 | 29.01 | 33.6 | ||
| HF-2 | Vertical | 80 | 1.85 | 30.4 | 20.5 |
| Horizontal | 40 | 25.93 | 35.0 | ||
Fitting results of multiple linear regression
| Fitting equations | R2 | |
|---|---|---|
| Knitted yarn strength utilization factor in vertical direction y1 | yl =24.022+0.22x1-987.742x2 | 0.998 |
| Knitted yarn strength utilization factor in horizontal direction y2 | y2=40.111+0.283x1-1672.848x2 | 0.998 |
Tensile properties of metallic yarns
| No. | LF-1 yarn | LF-2 yarn | HF-1 yarn | HF-2 yarn |
|---|---|---|---|---|
| Breaking strength (cN) | 167.1 | 389.4 | 216.6 | 185.8 |
| Elongation at break (%) | 23.8 | 1.8 | 2.0 | 1.9 |
Bending stiffness of metallic yarns
| No. | LF-1 yarn | LF-2 yarn | HF-1 yarn | HF-2 yarn |
|---|---|---|---|---|
| Bending stiffness By (cN·cm2) | 0.0121 | 0.0152 | 0.0039 | 0.0037 |