Low-Loss Elliptical Response Filter at 100 GHz

Leal-Sevillano, Carlos A.; Montejo‐Garai, José R.; Ruiz‐Cruz, Jorge A.; Rebollar, J.M.

doi:10.1109/lmwc.2012.2212237

Cited by 42 publications

(31 citation statements)

References 6 publications

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“…10. It should be pointed out that this value is similar to the effective conductivity obtained at -band using low-cost milling processes [28]. In the case of horizontal polarization, an effective conductivity of 1 10 S m was obtained.…”

Section: B Scattering Parameters Measurement and Discussionsupporting

confidence: 84%

A Micromachined Dual-Band Orthomode Transducer

Leal-Sevillano

Tian

Lancaster

et al. 2014

IEEE Trans. Microwave Theory Techn.

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In this paper, an orthomode transducer (OMT) for dual-band operation and optimized for stacked micromachined layers implementation is presented. The proposed design avoids the use of septums, irises, pins, or small features and minimizes the number of equal-thickness micromachined layers required. In this way, the micromachining fabrication is simplified, making the proposed design a very attractive candidate for high frequency applications and for low-cost batch production. A -band dual-band design (one different polarization in each frequency band) with more than 10% fractional bandwidth for each band and 30% separation between bands is presented. In addition, proper routing and layered bends are designed for an optimum standard interfacing with the same orientation of the input/output ports. Two OMTs in a back-to-back configuration are fabricated using a thick SU-8 photo-resist micromachining process. A total of six stacked SU-8 layers, all of them with the same thickness of 635 m, are used. The experimental results are coherent with the tolerance and misalignment of the process, validating the proposed novel OMT design.Index Terms-Dual-band, micromachining, orthomode transducer (OMT), SU-8, -band, waveguide.

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Section: B Scattering Parameters Measurement and Discussionsupporting

confidence: 84%

A Micromachined Dual-Band Orthomode Transducer

Leal-Sevillano

Tian

Lancaster

et al. 2014

IEEE Trans. Microwave Theory Techn.

Self Cite

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“…In addition, a majority of the filters are constructed using split block technology, for which the filters are cut along the middle of the broadside wall for minimized loss. Table I indicates that the laser machined filter and 3-D printed filter demonstrate a comparable performance (in terms of low insertion loss and good return loss) to those made by high precision milling [1], [2].…”

Section: Measurement and Discussionmentioning

confidence: 96%

$W$ -Band Waveguide Filters Fabricated by Laser Micromachining and 3-D Printing

Shang

Penchev

Guo

et al. 2016

IEEE Trans. Microwave Theory Techn.

121

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This paper presents two W-band waveguide bandpass filters, one fabricated using laser micromachining and the other 3-D printing. Both filters are based on coupled resonators and are designed to have a Chebyshev response. The first filter is for laser micromachining and it is designed to have a compact structure allowing the whole filter to be made from a single metal workpiece. This eliminates the need to split the filter into several layers and therefore yields an enhanced performance in terms of low insertion loss and good durability. The second filter is produced from polymer resin using a stereolithography 3-D printing technique and the whole filter is plated with copper. To facilitate the plating process, the waveguide filter consists of slots on both the broadside and narrow side walls. Such slots also reduce the weight of the filter while still retaining the filter's performance in terms of insertion loss. Both filters are fabricated and tested and have good agreement between measurements and simulations.

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“…Traditionally, waveguide filters or other microwave components are usually manufactured through a high-precision Computer Numerical Control (CNC) milling process. It is well known that this technology has been advancing for the past few decades, and waveguide components manufactured through the CNC milling process, which exhibits excellent measured results, have also been widely demonstrated in the current literature (e.g., [12][13][14][15]). However, as the RF spectrum continues to increase, the waveguide filters or other microwave components become smaller in feature size.…”

Section: Scope Motivations and Aimsmentioning

confidence: 99%

On the Design and Fabrication of Chained-Function Waveguide Filters With Reduced Fabrication Sensitivity Using CNC and DMLS

Lim¹,

Cheab²,

Soeung³

et al. 2020

PIER B

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In this paper, we present the design and fabrication of a novel class of emerging waveguide filters based on chained-functions at the millimeter-wave band. The derivation of chained-functions by chaining of prescribed generalized Chebyshev seed functions based on the partition theory is presented in details, and the implementation to waveguide technology is proposed and evaluated. The waveguide filter is fabricated through two different technologies, namely the Computer Numerical Control (CNC) milling technology and the Direct Metal Laser Sintering (DMLS) based additive manufacturing technology. The chained-function filters, which lie in between the Butterworth and Chebyshev filters, inherit the salient properties of both Butterworth and Chebyshev filters. Therefore, the chained-function waveguide filter exhibits filtering responses that have a superior rejection property and a lower loss with reduced sensitivity to fabrication tolerance than the standard Chebyshev waveguide filter. The efficiency of the proposed waveguide filter is confirmed both theoretically and empirically, using the CNC and DMLS processes. The issues of a higher manufacturing tolerance and apparent surface roughness associated with the DMLS method are found to be electrically insignificant when the chained-function concept is adopted in waveguide filter design. In general, the measured results of all the realized waveguide filters agree well to those of the simulation models. These results positively demonstrate that the chainedfunction concept has robust properties for rapid, high-performance, low-cost, and sustainable filter design and implementation, particularly for higher millimeter-wave frequency bands and for narrowband applications.

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Low-Loss Elliptical Response Filter at 100 GHz

Cited by 42 publications

References 6 publications

A Micromachined Dual-Band Orthomode Transducer

A Micromachined Dual-Band Orthomode Transducer

$W$ -Band Waveguide Filters Fabricated by Laser Micromachining and 3-D Printing

On the Design and Fabrication of Chained-Function Waveguide Filters With Reduced Fabrication Sensitivity Using CNC and DMLS

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