Left hand microstrip transmission line, and time delay line structured based on the transmission line
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Embodiment 1
[0042] In this embodiment, the left-hand microstrip transmission line unit is made on a conventional printed circuit board. The printed circuit board is the most common dielectric coated conductor board. The upper surface layer 1 and the lower surface layer 2 are metal conductor copper, and the thickness is 0.004. mm, the ground of the left-hand transmission line is formed by the metal copper of the lower surface layer, and the middle layer 3 is a Rogers TMM 10i dielectric board with a dielectric constant of 9.8 and a thickness of 0.254 mm. The metal interdigital capacitor 4 is made by printed circuit technology on the upper surface layer. The number of interdigital pairs is 5 (that is, there are 5 interdigital fingers in each plane interdigital structure). Two plane interdigital structures are placed in cross and parallel, and the inner side is 4 The interdigital width is 0.1mm, the interdigital spacing is 0.1mm, and the interdigital length is 1mm; the outermost pair of interdigi...
Embodiment 2
[0045] In this embodiment, the left-hand microstrip transmission line unit is fabricated on a conventional printed circuit board. The upper surface layer 1 and the lower surface layer 2 of the printed circuit board are made of metal conductor copper with a thickness of 0.004mm. Forming the ground of the left-hand transmission line, the middle layer 3 is a Rogers RT / duroid5880 dielectric board with a dielectric constant of 2.2 and a thickness of 0.254mm. The metal interdigital capacitor 4 is made by printed circuit technology on the upper surface layer, the number of interdigital pairs is 3, two plane interdigital structures are placed in cross and parallel, the inner side 2 pairs of interdigital width are 0.1mm, the interdigital spacing is 0.1mm, interdigital Length 1mm; the outermost pair of interdigital width is 0.3mm, the interdigital spacing is 0.1mm, and the interdigital length is 1mm. The outer ends of each plane interdigital structure are connected by sidebands 5, with a si...
Embodiment 3
[0059] The time delay line based on the left-hand microstrip transmission line in this embodiment is also made on a printed circuit board. The upper surface layer 1 and the lower surface layer 2 of the printed circuit board are made of metal conductor copper with a thickness of 0.004mm. The metal copper forms the ground of the left-hand transmission line, and the middle layer 3 is a RogersRT / duroid 5880 dielectric board with a dielectric constant of 2.2 and a thickness of 0.254 mm. On the upper surface layer, a metal interdigital capacitor 4 is made by printed circuit technology, with 3 pairs of interdigital pairs, two interdigital structures are placed in cross and parallel, the interdigital width is 0.1mm, the interdigital distance is 0.1mm, and the interdigital length is 1.415mm. A sideband 5 is connected to the outer end of each interdigital structure with a side width of 0.1mm and a sideband length of 1.4mm. The feeders of the input and output ports 6 are respectively located...
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