access icon free Design of three-dimensional filtering balun with inherent complete ground and enhanced stopband rejection

A novel design approach of three-dimensional filtering balun with inherent complete ground and enhanced stopband rejection is proposed. The whole structure consists of a horizontal feeding plane, a vertically mounted plane, and three ports. By arranging the double-sided parallel-strip line filter symmetrically on the two sides of the vertical plane, the frequency selectivity and complete ground are effectively synthesised. By inserting a rectangular conductor plane with two crossed slots into the middle of the vertical plane, the balanced-to-unbalanced conversion and stopband rejection are significantly enhanced. For demonstration, an experimental filtering balun is fabricated. The measurement agrees well with the simulation, achieving a wide upper stopband under −15 dB from 3.77 to 9.74 GHz.

Inspec keywords: band-stop filters; baluns; microwave filters; strip line filters

Other keywords: 3D filtering balun design; frequency 3.77 GHz to 9.74 GHz; horizontal feeding plane; vertically mounted plane; balanced-to-unbalanced conversion; stopband rejection; parallel-strip line filter

Subjects: Filters and other networks; Waveguide and microwave transmission line components; Microwave circuits and devices

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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.4821
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content/journals/10.1049/el.2017.4821
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