Novel broadband printed dipole antenna with branch wire integrated with feed balun
A technology of dipole antenna and feeding balun, which is applied in the direction of mid-position feeding between antenna terminals, slot antenna, resonant antenna, etc. Sub-antenna design, unfavorable cross structure array design, etc., to overcome the narrow bandwidth of printed dipoles, facilitate integrated design, and improve processing complexity.
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Embodiment 1
[0039] Embodiment 1, single layer structure antenna
[0040] The dielectric board 2 is an FR4 dielectric board with a dielectric constant of 4.4 and a thickness of 1.5 mm, with a length of 82 mm and a width of 62 mm. The length of the upper end of the radiation unit 4 is 72 mm, about half the wavelength of the center frequency of 2.3 GHz, and the width is 23 mm. The height of the radiation unit 4 is 55 mm, and the width of the lower end is 30 mm. In the middle of the radiation unit 4, there is a slot with a width of 5 mm and a length of 32 mm.
[0041] The total height of the microstrip feed integrated balun 3 on the opposite side of the dielectric board 2 is 39.8 mm. The microstrip line 301 with a characteristic impedance of 50 ohms has a length of 11 mm and a width of 2.8 mm. The first-stage impedance transformation section 302 is 20 mm long and 2 mm wide. The width of the second fold line impedance transformation section 303 is 0.8mm, the length of the vertical section i...
Embodiment 2
[0045] Embodiment 2, double-layer structure plus reflector antenna
[0046] refer to Figure 4 , according to the antenna with the single-layer structure above, a double-layer dielectric board structure antenna is designed. Such as Figure 4 , further includes a metal reflector 5, the dielectric plate 2 is two pieces, the two dielectric plates 2 are stacked together to form a double-layer dielectric plate, the double-layer dielectric plate is vertically arranged on the metal reflector 5, the double-layer dielectric The aforementioned radiation unit 4 is printed on both outer surfaces of the board, and the aforementioned stripline integrated feed balun 3 is printed on the middle interlayer of the double-layer dielectric board.
[0047] Dielectric plate 2 selects the FR4 medium plate that dielectric constant is 4.4, thickness is 1.5mm for use, and the metal reflector 5 top that adds is long 92mm, and height is 64mm, medium plate; Metal reflector 5 lower end dielectric plates a...
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