Micromachined Integrated Waveguide Transformers in THz Pickett–Potter Feedhorn Blocks

Kristina K. Davis, Jenna L. Kloosterman, Christopher Groppi, Jonathan H. Kawamura, Matthew Underhill

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We present the design, fabrication technique, and performance of a circular-to-rectangular waveguide transformer integrated into a 1.9 THz Pickett–Potter feedhorn detector block. This design is applicable for instruments where circularly symmetric feedhorns are required to mate with rectangular waveguide-fed receiver devices that house the detector chip. The transformer was fabricated by direct metal micromachining, which offers significant advantages in reducing the complexity, timescale, and cost of manufacturing over competing techniques, such as transformer segments machined into separate blocks or machined into split-block segments. We simulate the tradeoff between the fabrication technique and the cost of rounding the edges of the rear rectangular waveguide. Simulations of the transformer circuitry using multiple electromagnetic software packages were used to finalize the dimensions of the optimized transformer. A single pixel feedhorn-transf ormer module was manufactured on a three-axis milling machine to test the feasibility of the design and manufacturing technique. We tested the performance of the integrated feedhorn-transformer modules using waveguide-fed hot electron bolometer mixers designed and fabricated at the Jet Propulsion Laboratory. Radiation patterns of the Pickett–Potter modules were measured using a high-power 1.9 THz multiplication chain as the source. We find good agreement between the simulated and measured beam pattern.

Original languageEnglish (US)
JournalIEEE Transactions on Terahertz Science and Technology
DOIs
StateAccepted/In press - Oct 22 2017

Fingerprint

Waveguide transformers
Rectangular waveguides
transformers
Antenna feeders
waveguides
rectangular waveguides
Detectors
Fabrication
Bolometers
Milling machines
Hot electrons
modules
Micromachining
Software packages
Propulsion
Costs
Waveguides
manufacturing
Pixels
milling machines

Keywords

  • Antenna feed
  • Detectors
  • Instruments
  • Machining
  • manufacturing processes
  • Optical waveguides
  • oval waveguide (OWG)
  • Receivers
  • Rectangular waveguides
  • terahertz (THz) array technology
  • waveguide transformer (WGT)
  • waveguide transition

ASJC Scopus subject areas

  • Radiation
  • Electrical and Electronic Engineering

Cite this

Micromachined Integrated Waveguide Transformers in THz Pickett–Potter Feedhorn Blocks. / Davis, Kristina K.; Kloosterman, Jenna L.; Groppi, Christopher; Kawamura, Jonathan H.; Underhill, Matthew.

In: IEEE Transactions on Terahertz Science and Technology, 22.10.2017.

Research output: Contribution to journalArticle

@article{6addca39a37d42f09dccfc87a8b19745,
title = "Micromachined Integrated Waveguide Transformers in THz Pickett–Potter Feedhorn Blocks",
abstract = "We present the design, fabrication technique, and performance of a circular-to-rectangular waveguide transformer integrated into a 1.9 THz Pickett–Potter feedhorn detector block. This design is applicable for instruments where circularly symmetric feedhorns are required to mate with rectangular waveguide-fed receiver devices that house the detector chip. The transformer was fabricated by direct metal micromachining, which offers significant advantages in reducing the complexity, timescale, and cost of manufacturing over competing techniques, such as transformer segments machined into separate blocks or machined into split-block segments. We simulate the tradeoff between the fabrication technique and the cost of rounding the edges of the rear rectangular waveguide. Simulations of the transformer circuitry using multiple electromagnetic software packages were used to finalize the dimensions of the optimized transformer. A single pixel feedhorn-transf ormer module was manufactured on a three-axis milling machine to test the feasibility of the design and manufacturing technique. We tested the performance of the integrated feedhorn-transformer modules using waveguide-fed hot electron bolometer mixers designed and fabricated at the Jet Propulsion Laboratory. Radiation patterns of the Pickett–Potter modules were measured using a high-power 1.9 THz multiplication chain as the source. We find good agreement between the simulated and measured beam pattern.",
keywords = "Antenna feed, Detectors, Instruments, Machining, manufacturing processes, Optical waveguides, oval waveguide (OWG), Receivers, Rectangular waveguides, terahertz (THz) array technology, waveguide transformer (WGT), waveguide transition",
author = "Davis, {Kristina K.} and Kloosterman, {Jenna L.} and Christopher Groppi and Kawamura, {Jonathan H.} and Matthew Underhill",
year = "2017",
month = "10",
day = "22",
doi = "10.1109/TTHZ.2017.2760103",
language = "English (US)",
journal = "IEEE Transactions on Terahertz Science and Technology",
issn = "2156-342X",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - Micromachined Integrated Waveguide Transformers in THz Pickett–Potter Feedhorn Blocks

AU - Davis, Kristina K.

AU - Kloosterman, Jenna L.

AU - Groppi, Christopher

AU - Kawamura, Jonathan H.

AU - Underhill, Matthew

PY - 2017/10/22

Y1 - 2017/10/22

N2 - We present the design, fabrication technique, and performance of a circular-to-rectangular waveguide transformer integrated into a 1.9 THz Pickett–Potter feedhorn detector block. This design is applicable for instruments where circularly symmetric feedhorns are required to mate with rectangular waveguide-fed receiver devices that house the detector chip. The transformer was fabricated by direct metal micromachining, which offers significant advantages in reducing the complexity, timescale, and cost of manufacturing over competing techniques, such as transformer segments machined into separate blocks or machined into split-block segments. We simulate the tradeoff between the fabrication technique and the cost of rounding the edges of the rear rectangular waveguide. Simulations of the transformer circuitry using multiple electromagnetic software packages were used to finalize the dimensions of the optimized transformer. A single pixel feedhorn-transf ormer module was manufactured on a three-axis milling machine to test the feasibility of the design and manufacturing technique. We tested the performance of the integrated feedhorn-transformer modules using waveguide-fed hot electron bolometer mixers designed and fabricated at the Jet Propulsion Laboratory. Radiation patterns of the Pickett–Potter modules were measured using a high-power 1.9 THz multiplication chain as the source. We find good agreement between the simulated and measured beam pattern.

AB - We present the design, fabrication technique, and performance of a circular-to-rectangular waveguide transformer integrated into a 1.9 THz Pickett–Potter feedhorn detector block. This design is applicable for instruments where circularly symmetric feedhorns are required to mate with rectangular waveguide-fed receiver devices that house the detector chip. The transformer was fabricated by direct metal micromachining, which offers significant advantages in reducing the complexity, timescale, and cost of manufacturing over competing techniques, such as transformer segments machined into separate blocks or machined into split-block segments. We simulate the tradeoff between the fabrication technique and the cost of rounding the edges of the rear rectangular waveguide. Simulations of the transformer circuitry using multiple electromagnetic software packages were used to finalize the dimensions of the optimized transformer. A single pixel feedhorn-transf ormer module was manufactured on a three-axis milling machine to test the feasibility of the design and manufacturing technique. We tested the performance of the integrated feedhorn-transformer modules using waveguide-fed hot electron bolometer mixers designed and fabricated at the Jet Propulsion Laboratory. Radiation patterns of the Pickett–Potter modules were measured using a high-power 1.9 THz multiplication chain as the source. We find good agreement between the simulated and measured beam pattern.

KW - Antenna feed

KW - Detectors

KW - Instruments

KW - Machining

KW - manufacturing processes

KW - Optical waveguides

KW - oval waveguide (OWG)

KW - Receivers

KW - Rectangular waveguides

KW - terahertz (THz) array technology

KW - waveguide transformer (WGT)

KW - waveguide transition

UR - http://www.scopus.com/inward/record.url?scp=85032447906&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85032447906&partnerID=8YFLogxK

U2 - 10.1109/TTHZ.2017.2760103

DO - 10.1109/TTHZ.2017.2760103

M3 - Article

AN - SCOPUS:85032447906

JO - IEEE Transactions on Terahertz Science and Technology

JF - IEEE Transactions on Terahertz Science and Technology

SN - 2156-342X

ER -