Ultra-wideband dielectric rod antenna for 18-40GHz frequency band
A dielectric rod, ultra-wideband technology, applied in the direction of the connection of the antenna grounding switch structure, the structural form of the radiating element, etc., can solve the problem of pattern splitting at high frequencies, the operating frequency band of the dielectric rod antenna is narrow, and the 18-40GHz frequency band cannot be fully covered. , to achieve the effect of widening the working bandwidth and avoiding the splitting of the pattern
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[0043] Specific implementation mode 1: Combination Figure 1-14 In this embodiment, an ultra-wideband dielectric rod antenna for the 18-40 GHz frequency band is described. It includes a dielectric rod structure 1 and a feed structure 2. The dielectric rod structure 1 includes a cylindrical section 11 and a truncated cone section that are fixed in turn from end to end. 12 and the transition block 13, the feed structure 2 includes a ridge waveguide 21, an impedance transformation ladder 22 and a coaxial line 23,
[0044] The outer conductor 23-1 of the coaxial line 23 is fixed to the upper ridge 21-3 of the ridge waveguide 21 through the metal plate 21-2, and the inner conductor 23-2 of the coaxial line 23 is connected to the lower part of the ridge waveguide 21 through the impedance conversion step 22. Ridge 21-4 is fixed,
[0045] The upper ridge 21-3 of the ridge waveguide 21 includes a first ridge section 21-31 and a second ridge section 21-32. The first ridge section 21-31 has a...
Example Embodiment
[0068] Specific implementation manner two: combination Figure 1-14 To illustrate this embodiment, the width and outer dimension A of the housing of the ridge waveguide 21 is 9.4 mm, the inner dimension a of the housing is 7.4 mm, the outer dimension B of the housing height is 6.2 mm, and the inner dimension b of the housing height is 4.2 mm. The axial length L4 of the body is 32 mm.
[0069] Length of lower ridge 21-4 L 6 23.1mm, the width of the lower ridge 21-4 is 1.83mm, and the ridge curve takes the form of an exponential function:
[0070] y=e kx -1, x∈[0,23.1]
[0071] Where x represents the distance of the ridge curve along the axial direction of the ridge waveguide 21, y represents the vertical distance between the ridge curve and the inner surface of the ridge waveguide 21, k is used to adjust the shape of the curve, and k is taken as 0.037.
[0072] The dielectric rod structure 1 is made of polytetrafluoroethylene material with a relative dielectric constant of 2.2. The le...
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