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Brno College of Expertise: 3D Printed Lens for Excessive Directional Low-Profile Antenna

Jaroslav Zechmeister, with assist for analysis from the Inner Grant Company of Brno College of Expertise, has developed a horn antenna as a part of the Doctoral Diploma Programme. With findings not too long ago revealed in ‘3D-Printed Lens for Excessive Directional Low-Profile Antenna,’ Zechmeister explains what strategies and supplies have been used.

Reminding us of the precious advantages of 3D printing, Zechmeister factors out that this technique of manufacturing is quickly rising and applies to many alternative areas of business, together with microwave know-how—permitting for quicker turnaround, better affordability and accessibility, and the flexibility to design with out having to attend on a intermediary for prototypes or adjustments to components. 3D printing has additionally been utilized in many alternative initiatives that includes antennas, from liquid steel antennas to a number of enter/a number of output antennas, and multi-beam purposes.

Whereas different research have been revealed relating to the 3D printed dielectric lens, they weren’t instantly associated to any such work, with Zechmeister choosing a hyperbolic lens, that includes a curved edge on just one aspect.

Brno College of Expertise: 3D Printed Lens for Excessive Directional Low-Profile Antenna

Mannequin of antenna with hyperbolic lens a) and hyperbolic lens scheme b).

Because of the curved aspect, the lens affords the advantage of not interfering above the aperture aircraft. The acquire is fed by the horn antenna, accentuated by way of enhance of the aperture radius—a function that may be enlarged a lot that radiation power is shipped by the aspect lobes.

Brno College of Expertise: 3D Printed Lens for Excessive Directional Low-Profile Antenna

Dependence of perfect radius a) and maximal acquire b) on the relative permittivity of lens materials.

Zechmeister selected each ABS and a photopolymer for 3D printing, in addition to measuring the dielectric lens fabrication to be used with the silon and ertacel.

“The strategy is predicated on the measurement of scattering parameters of a pattern positioned in a pattern holder,” acknowledged Zechmeister. “On this case, a chunk of a waveguide WR10 was used because the pattern holder.”

Brno College of Expertise: 3D Printed Lens for Excessive Directional Low-Profile Antenna

Measured frequency dependence of relative permittivity and conductivity of ABS materials a) and photopolymer b) for frequency band 70 – 80 GHz.

Brno College of Expertise: 3D Printed Lens for Excessive Directional Low-Profile Antenna

Measured properties of supplies for dielectric lens at 77 GHz.

Utilizing the beforehand measured parameters, Zechmeister was capable of design the lenses with theoretical most acquire of the antenna with the ABS lens at 30.2 dBi and the photopolymer lens at 31 dBi.

“Nevertheless, these values are theoretical, contemplating lossless supplies and the best radius of the aperture. For the numerical fashions, the measured losses of the supplies have been included, and the radius of the aperture was chosen 33 mm which represents compromise between the best radii for the ABS materials and the photopolymer,” defined Zechmeister.

“The optimized antenna with the lens made out of the ABS materials has at 77 GHz the acquire 27.7 dBi and the angular width of the primary lobe within the E-plane and the H-plane is four.1˚ and 6.5˚, respectively. The extent of the aspect lobes was greater than 20 dB under the maximal worth. The simulated acquire of the antenna with the photopolymer lens is 27 dBi, the angular width of the primary lobe within the E-plane and within the H-plane are three.5˚ and 5.7˚, respectively. The extent of the aspect lobes is 19 dB under the utmost worth.”

Though printer layers have been clearly famous on the ABS lens floor, Zechmeister acknowledged that photopolymer floor was ‘nearly completely easy.’  The disadvantage, nevertheless, was that the photopolymer lens additionally exhibited ‘poor geometrical precision.’

Brno College of Expertise: 3D Printed Lens for Excessive Directional Low-Profile Antenna

The brass horn a), the ABS lens b) and the photopolymer lens c).

Brno College of Expertise: 3D Printed Lens for Excessive Directional Low-Profile Antenna

Comparability between measured and simulated acquire of antenna with ABS lens in E-plane a) and H-plane b) and of antenna with photopolymer lens in E-plane c) and H-plane d).

“The achieved outcomes present that 3D printed dielectric lenses are usable as much as W frequency band,” concluded Zechmeister.

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[Source / Images: ‘3D-Printed Lens for High Directional Low-Profile Antenna’]

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