Wireless Measurement of the Pressure from the Ka-Band Radar Echo of a 3D-Printed Microfluidic Depolarizing Sensor

This paper presents a lightweight, cost-efficient, wideband, and high-gain 3D printed parabolic reflector antenna in the Ka-band. A 10 λ reflector is printed with polylactic acid- (PLA-) based material that is a biodegradable type of plastic, preferred in 3D printing. The reflecting surface is made up of multiple stacked layers of copper tape, thick enough to function as a reflecting surface (which is found 4 mm). A conical horn is used for the incident field. A center-fed method has been used to converge the energy in the broadside direction. The proposed antenna results measured a gain of 27.8 dBi, a side lobe level (SLL) of −22 dB, and a maximum of 61.2% aperture efficiency (at 30 GHz). A near-field analysis in terms of amplitude and phase has also been presented which authenticates the accurate spherical to planar wavefront transformation in the scattered field.

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3D-Printed Graphene Antennas and Interconnections for Textile RFID Tags: Fabrication and Reliability towards Humidity

International Journal of Antennas and Propagation ◽

10.1155/2017/1386017 ◽

2017 ◽

Vol 2017 ◽

pp. 1-5 ◽

Cited By ~ 6

Author(s):

Han He ◽

Mitra Akbari ◽

Lauri Sydänheimo ◽

Leena Ukkonen ◽

Johanna Virkki

Keyword(s):

Rfid Tags ◽

High Humidity ◽

Direct Write ◽

Uhf Rfid ◽

Printed Antenna ◽

Passive Uhf Rfid ◽

Measurement Results ◽

One Step ◽

3D Printed ◽

Wireless Measurement

We present the possibilities of 3D direct-write dispensing in the fabrication of passive UHF RFID graphene tags on a textile substrate. In our method, the graphene tag antenna is deposited directly on top of the IC strap, in order to simplify the manufacturing process by removing one step, that is, the IC attachment with conductive glue. Our wireless measurement results confirm that graphene RFID tags with printed antenna-IC interconnections achieve peak read ranges of 5.2 meters, which makes them comparable to graphene tags with epoxy-glued ICs. After keeping the tags in high humidity, the read ranges of the tags with epoxy-glued and printed antenna-IC interconnections decrease 0.8 meters and 0.5 meters, respectively. However, after drying, the performance of both types of tags returns back to normal.

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Beam Scanning Capabilities of a 3D-Printed Perforated Dielectric Transmitarray

Electronics ◽

10.3390/electronics8040379 ◽

2019 ◽

Vol 8 (4) ◽

pp. 379 ◽

Cited By ~ 5

Author(s):

Andrea Massaccesi ◽

Gianluca Dassano ◽

Paola Pirinoli

Keyword(s):

3D Printing ◽

Unit Cell ◽

Multibeam Antenna ◽

Beam Scanning ◽

Additional Advantage ◽

Ka Band ◽

Measured Radiation ◽

3D Printed ◽

Printing Techniques

In this paper, the design of a beam scanning, 3D-printed dielectric Transmitarray (TA) working in Ka-band is discussed. Thanks to the use of an innovative three-layer dielectric unit-cell that exploits tapered sections to enhance the bandwidth, a 50 × 50 elements transmitarray with improved scanning capabilities and wideband behavior has been designed and experimentally validated. The measured radiation performances over a scanning coverage of ±27 ∘ shown a variation of the gain lower than 2.9 dB and a 1-dB bandwidth in any case higher than 23%. The promising results suggest that the proposed TA technology is a valid alternative to realize a passive multibeam antenna, with the additional advantage that it can be easily manufactured using 3D-printing techniques.

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