Machining of terahertz split-block waveguides with micrometer precision

Development of dual-polarization sensitive receivers offers significant advantages for future terahertz radiometers. The key to any such system is the orthogonal mode transducer (OMT) which separates two superimposed modes into two single-mode waveguides. This letter presents the design, fabrication and measurement of a split-block asymmetrical OMT operating from 500 to 600 GHz.Index Terms-Metal machining, orthogonal mode transducer (OMT), terahertz.

show abstract

“…The OMT is fabricated at the Jet Propulsion Laboratory (JPL) machine shop from brass and then electroplated with 2 m of gold [8].…”

Section: Fabrication and Measurementmentioning

confidence: 99%

A 600 GHz Asymmetrical Orthogonal Mode Transducer

Reck

Chattopadhyay

2013

IEEE Microw. Wireless Compon. Lett.

View full text Add to dashboard Cite

show abstract

“…3 shows three different realization options for a 90° twist: (a) standard continuous waveguide, (b) split-block milled waveguide, and (c) single milled steps, which are combined to the final waveguide. Split-block technique is used for various rf- and terahertz-structures, as shown in [12, 13]. However, many milling structures can get very complex and consequently uneconomic for industrial applications.…”

Section: Stepped Waveguide Techniquementioning

confidence: 99%

Investigation of a circular TE₁₁-TE₀₁-mode converter in stepped waveguide technique

Schulz

Baer

Musch

et al. 2015

Int. J. Microw. Wireless Technol.

View full text Add to dashboard Cite

A compact and broadband TE11-TE01-mode converter, suitable for various industrial applications like bypass level measurements, is presented in this contribution. Based on stepped waveguide technique, the main advantages of the recommended converter design and the specific field distribution of the TE01-mode are discussed in detail. The converter is presented exemplary for a frequency range from 23 to 28 GHz, which corresponds to a bandwidth of approximately 20 % of the center frequency. Numerous three-dimensional electromagnetic field simulations are performed to optimize the converter and to investigate its reflection and transmission behavior. Realized by six different single elements and 11 parts in total, fast and effective simulations can be performed with CST Microwave Studio. Considering realistic production process parameters, like fillets or tolerances, a good return loss better 17 dB, an insertion loss of 0.1 dB, and an excellent mode purity are achieved. Compared with back-to-back, realistic disturber scenario, and far-field measurements with a first prototype, the expected excellent converter behavior can be validated without limitations. Hence, the suitability of the presented converter design is proven and the feasibility is demonstrated.

show abstract

“…While waveguide systems provide an alternative solution, they suffer from high weight, complex manufacturing and assembly involving CNC milling. In addition, with increasing system complexity, the typically utilized split block assembly [1] could turn into a complex puzzle.…”

Section: Introductionmentioning

confidence: 99%

Additively Manufactured Amplitude Tapered Slotted Waveguide Array Antenna With Horn Aperture for 77 GHz

2022

View full text Add to dashboard Cite

In this work, a combined frontend of horn and slotted waveguide array antenna serving as feeding subsystem is presented. This setup allows to implement an amplitude taper in one plane while using the horn aperture to shape the far field radiation characteristics in the perpendicular plane independently and tailored to the individual demand of the application. Moreover, the feeding system is implemented as a loop resulting in a standing wave distribution for a wide frequency range in order to increase the antenna bandwidth. Two specimens with different horn apertures are additively manufactured in slotted waveguide technology from UV curable photopolymer resin using a digital light processing 3D printer and subsequently metal coated by electroless silver plating. A relatively large bandwidth of B −10dB = 7.2 GHz and a B −15 dB of 4.9 GHz is achieved in measurements indicating a relative bandwidth of 9 % and 6 % respectively. Antenna Gain is characterized as 17.5 and 20.17 dBi in measurements while maintaining a sidelobe level of 20-22.5 dB at 77 GHz and exhibiting a radiation efficiency of 78.9 and 79.4 %. The proposed antenna architecture provides a flexible approach for beam shaping in applications where azimuth and elevation planes exhibit different or contrary requirements, e.g. broad vs. narrow field of view -especially suitable for automotive MIMO-radar sensors.

show abstract

Machining of terahertz split-block waveguides with micrometer precision

Cited by 22 publications

References 5 publications

A 600 GHz Asymmetrical Orthogonal Mode Transducer

A 600 GHz Asymmetrical Orthogonal Mode Transducer

Investigation of a circular TE₁₁-TE₀₁-mode converter in stepped waveguide technique

Additively Manufactured Amplitude Tapered Slotted Waveguide Array Antenna With Horn Aperture for 77 GHz

Contact Info

Product

Resources

About

Machining of terahertz split-block waveguides with micrometer precision

Cited by 22 publications

References 5 publications

A 600 GHz Asymmetrical Orthogonal Mode Transducer

A 600 GHz Asymmetrical Orthogonal Mode Transducer

Investigation of a circular TE11-TE01-mode converter in stepped waveguide technique

Additively Manufactured Amplitude Tapered Slotted Waveguide Array Antenna With Horn Aperture for 77 GHz

Contact Info

Product

Resources

About

Investigation of a circular TE₁₁-TE₀₁-mode converter in stepped waveguide technique