ADDITIVE MANUFACTURING OF RADIO-FREQUENCY COMPONENTS

doi:10.1109/jproc.2017.2676639

Additive Manufacturing of Radio-Frequency Components [Scanning the Issue]

Proceedings of the IEEE ◽

10.1109/jproc.2017.2670298 ◽

2017 ◽

Vol 105 (4) ◽

pp. 589-592 ◽

Cited By ~ 4

Author(s):

Roberto Sorrentino ◽

Petronilo Martin-Iglesias ◽

Oscar Antonio Peverini ◽

Thomas M. Weller

Keyword(s):

Additive Manufacturing ◽

Radio Frequency ◽

Frequency Components

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Measuring sub-picosecond optical propagation delay changes on optical fibre using photonics and radio frequency components

10.1117/12.2245747 ◽

2017 ◽

Cited By ~ 1

Author(s):

Roufurd P. M. Julie ◽

Thomas Abbott

Keyword(s):

Radio Frequency ◽

Optical Fibre ◽

Propagation Delay ◽

Optical Propagation ◽

Frequency Components

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Multifrequency Radio Properties of the Crab Pulsar

International Astronomical Union Colloquium ◽

10.1017/s0252921100041713 ◽

1996 ◽

Vol 160 ◽

pp. 283-284

Author(s):

David A. Moffett ◽

Timothy H. Hankins

Keyword(s):

Radio Frequency ◽

Spectral Index ◽

Noise Level ◽

Phased Array ◽

Crab Nebula ◽

Phase Changes ◽

Crab Pulsar ◽

Spectral Indices ◽

Frequency Components ◽

Later Phase

During a single Arecibo observation in 1981 of the Crab pulsar, a profile at 4.7 GHz was recorded which appeared to contain additional components and an interpulse (IP) shifted to earlier phase. The experiment was continued at the VLA, taking advantage of its phased array mode to form a synthesized beam, which resolves out the bright Crab Nebula background. Observations were conducted between February 9 and May 27, 1994, at 0.33, 1.4, 4.9, and 8.4 GHz. Additional radio profiles presented here were recorded at Arecibo (0.43, 0.6, and 4.7GHz) and Effelsberg (2.7GHz) by Hankins & Fowler (unpublished).In Figure 1 we have plotted a summary of normalized profiles from several radio frequencies and infrared. The VLA profiles are time aligned, while the rest are aligned to the main pulse (MP). A new component (labeled LFC) appears 36° ahead of the MP between 0.6 and 4.9 GHz, not coincident with the position of the precursor, and with a spectral index similar to that of the MP. The MP disappears at 8.4 GHz, probably due to spectral effects. The IP appears to undergo a transition in phase and flux, disappearing at 2.7 GHz and reappearing 10° earlier at 4.7 GHz with a radically different spectral index. Two high radio frequency components (labeled HFC1 and HFC2) appear at 4.9 and 8.4 GHz, and possibly at the noise level at 1.4 GHz. They have flatter spectral indices than the MP and IP and their centroid phase changes with respect to the MP – moving to later phase with increasing frequency. The infrared profile exhibits a “bump”, or third component near the same phase as HFC1 and HFC2.

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3D Inductive Frequency Selective Structures Using Additive Manufacturing and Low-Cost Metallization

Sensors ◽

10.3390/s22020552 ◽

2022 ◽

Vol 22 (2) ◽

pp. 552

Author(s):

Juan Andrés Vásquez-Peralvo ◽

Adrián Tamayo-Domínguez ◽

Gerardo Pérez-Palomino ◽

José Manuel Fernández-González ◽

Thomas Wong

Keyword(s):

Additive Manufacturing ◽

Millimeter Wave ◽

Low Cost ◽

Wave Band ◽

Copper Electroplating ◽

Before And After ◽

Millimeter Wave Band ◽

Frequency Components ◽

Band Pass ◽

Frequency Selective

The use of additive manufacturing and different metallization techniques for prototyping radio frequency components such as antennas and waveguides are rising owing to their high precision and low costs. Over time, additive manufacturing has improved so that its utilization is accepted in satellite payloads and military applications. However, there is no record of the frequency response in the millimeter-wave band for inductive 3D frequency selective structures implemented by different metallization techniques. For this reason, three different prototypes of dielectric 3D frequency selective structures working in the millimeter-wave band are designed, simulated, and manufactured using VAT photopolymerization. These prototypes are subsequently metallized using metallic paint atomization and electroplating. The manufactured prototypes have been carefully selected, considering their design complexity, starting with the simplest, the square aperture, the medium complexity, the woodpile structure, and the most complex, the torus structure. Then, each structure is measured before and after the metallization process using a measurement bench. The metallization used for the measurement is nickel spray flowed by the copper electroplating. For the electroplating, a detailed table showing the total area to be metallized and the current applied is also provided. Finally, the effectiveness of both metallization techniques is compared with the simulations performed using CST Microwave Studio. Results indicate that a shifted and reduced band-pass is obtained in some structures. On the other hand, for very complex structures, as in the torus case, band-pass with lower loss is obtained using copper electroplating, thus allowing the manufacturing of inductive 3D frequency selective structures in the millimeter-wave band at a low cost.

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