WR-3 Band Quasi-Elliptical Waveguide Filters Using Higher Order Mode Resonances

Ding, Jiang‐Qiao; Shi, Sheng‐Cai; Zhou, Kang; Zhao, Yun; Liu, Dong; Wu, Wen

doi:10.1109/tthz.2017.2686007

Cited by 63 publications

(24 citation statements)

References 23 publications

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“…This means a reduction in size and mass of components, but also a tighter dimensional tolerance is required during fabrication. Different micromachining techniques, such as computer numerically controlled (CNC) milling [4]- [6], Si deep reactive ion etching (DRIE) [7]- [9], lithographic micromachining technique [10], and SU-8 photoresist technology [11]- [13], have been developed and employed to achieve high-dimensional accuracy in the fabrication of high-frequency waveguide filters. Laser micromachining [14] and 3-D printing [14] have also been utilized for high-frequency filters by the authors using different designs at about 100 GHz.…”

Section: Wr-3 Waveguide Bandpass Filters Fabricated Usingmentioning

confidence: 99%

“…However, the limits of conventional CNC milling are still being pushed: examples of WR-3 band CNC milled filter This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/ can be found in [6], where two fourth-order bandpass filters are presented, one with measured 0.7-dB insertion loss and 8.77% (22.6 GHz) bandwidth and another with measured 0.5-dB insertion loss and 9.83% (25.2 GHz) bandwidth. In this paper, we present a WR-3 band CNC milled extracted pole filter with an improved performance, which is designed specifically for sideband rejection.…”

Section: Wr-3 Waveguide Bandpass Filters Fabricated Usingmentioning

confidence: 99%

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WR-3 Waveguide Bandpass Filters Fabricated Using High Precision CNC Machining and SU-8 Photoresist Technology

Yang

Dhayalan

Shang

et al. 2018

IEEE Trans. THz Sci. Technol.

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This paper presents two WR-3 band (220-325 GHz) filters, one fabricated in metal using high precision computer numerically controlled milling and the other made with metallized SU-8 photoresist technology. Both are based on three coupled resonators, and are designed for a 287.3-295.9-GHz passband, and a 30-dB rejection between 317.7 and 325.9 GHz. The first filter is an extracted pole filter coupled by irises, and is precision milled using the split-block approach. The second filter is composed of three silver-coated SU-8 layers, each 432 µm thick. The filter structures are specially chosen to take advantage of the fabrication processes. When fabrication tolerances are accounted for, very good agreement between measurements and simulations are obtained, with median passband insertion losses of 0.41 and 0.45 dB for the metal and SU-8 devices, respectively. These two filters are potential replacements of frequency selective surface filters used in heterodyne radiometers for unwanted sideband rejection. Index Terms-Micromachining, SU-8, terahertz components, waveguide filter. I. INTRODUCTION M ULTICHANNEL air and spaceborne sounders are employed for spectroscopic characterization of the Earth's atmosphere [1]. These instruments perform molecular spectroscopy at millimeter and submillimeter wavelengths in relatively narrow frequency channels. Within the instrument, linearly polarized signals are frequency demultiplexed by a Manuscript

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Section: Wr-3 Waveguide Bandpass Filters Fabricated Usingmentioning

confidence: 99%

Section: Wr-3 Waveguide Bandpass Filters Fabricated Usingmentioning

confidence: 99%

WR-3 Waveguide Bandpass Filters Fabricated Using High Precision CNC Machining and SU-8 Photoresist Technology

Yang

Dhayalan

Shang

et al. 2018

IEEE Trans. THz Sci. Technol.

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“…Computer numerical controlled (CNC) milling is a traditional machining technology for metal waveguide structures. Some components fabricated by CNC milling with excellent performance have been reported in References 8‐15. A pseudo‐elliptic waveguide bandpass filter at 357 GHz with 0.7 dB insertion loss and a 9.9% bandwidth was presented in Reference 8.…”

Section: Introductionmentioning

confidence: 99%

WR‐1.5 (500–750 GHz) waveguide bandpass filter fabricated using high precision computer numerically controlled machining

Wang

Lancaster

Wang

et al. 2020

Micro & Optical Tech Letters

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In this paper, a WR‐1.5 band (500–750 GHz) 3rd order waveguide bandpass filter has been designed and fabricated using high precision computer numerically controlled metal micromachining. The filter has been measured with a 7.29% (48.7 GHz) bandwidth at the center frequency of 667.5 GHz. The minimum passband insertion loss is measured to be 0.87 dB and the measured return loss is better than 10 dB across the whole passband. A yield percentage is analysed and estimated based on the fabrication tolerance.

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“…However, a common approach is to use classical computerized numerical control (CNC) milling machines as proposed by different groups in e.g. [5][6][7]19]. The advantages of CNC milling techniques are the large flexibility of realizable geometries and the widespread use of this technology.…”

Section: Introductionmentioning

confidence: 99%

WR-3 Band Waveguide Filter Tolerance Analysis and Surface Metallization Comparison

Miek

Kamrath

Boe

et al. 2020

J Infrared Milli Terahz Waves

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In this paper, a fifth-order WR-3 band waveguide filter with two transmission zeros (TZs) is presented. The design process is described and manufacturing issues are addressed. The filter is designed to fulfill a center frequency of 237.9 GHz and a fractional bandwidth of 2.64%. Three identical filters are manufactured with the classical computerized numerical control (CNC) milling technique in order to obtain information about the manufacturing repeatability for filter structures in the WR-3 band. The comparison shows that even in very high frequency regions a good repeatability can be achieved, if modern high-speed cutting (HSC) CNC milling machines are used. A comprehensive tolerance analysis is accomplished to classify the obtained results. The filters were manufactured from brass to ensure a meaningful comparability and due to the good machining qualities in CNC machines. In order to reduce the losses, the filters are afterwards sputtered with different materials (gold, silver, copper) to evaluate the effect on the insertion loss at very high frequencies. In comparison with the literature, it is shown that even narrow-band filters, which show a high sensitivity to machining tolerances, can be manufactured with high reliability and manufacturing repeatability in modern CNC milling machines. One of the measured filters shows a return loss higher than 20 dB over the whole passband.

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WR-3 Band Quasi-Elliptical Waveguide Filters Using Higher Order Mode Resonances

Cited by 63 publications

References 23 publications

WR-3 Waveguide Bandpass Filters Fabricated Using High Precision CNC Machining and SU-8 Photoresist Technology

WR-3 Waveguide Bandpass Filters Fabricated Using High Precision CNC Machining and SU-8 Photoresist Technology

WR‐1.5 (500–750 GHz) waveguide bandpass filter fabricated using high precision computer numerically controlled machining

WR-3 Band Waveguide Filter Tolerance Analysis and Surface Metallization Comparison

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