Journal
NANOTECHNOLOGY
Volume 31, Issue 19, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab7048
Keywords
microfabrication; half-mode waveguide; bandpass filter; 5G millimeter-wave
Funding
- China Scholarship Council (CSC) [201803170233]
- Natural Science and Engineering Research Council of Canada (NSERC)
- CMC Microsystems
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In this paper, we propose a miniaturized monolithic bandpass filter utilizing an air-filled half-mode waveguide and an inward curving split ring resonator array in the millimeter-wave band. The waveguide blocks the wave below cutoff frequency and the uniplanar array forms a rejection band above the transmission band. The microfabrication process of the filter adopts photoimageable technology and the combination of films with different thicknesses to build a 3D structure. The measured prototype has a center frequency at 65.5 GHz with a 3 dB fractional bandwidth of 30.7%. The minimum insertion loss is 2.1 dB. The proposed component offers excellent performance including a wide transmission band, a low pass-band insertion loss, an excellent isolation in the stop-band, and a steep roll-off at the upper cutoff frequency. Besides, due to the scalability of the waveguide and periodic array, this filter can be adapted for other frequency ranges.
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