Tri-band antenna based on CSRR and LHTL
A technology for antennas and small antennas, which is applied in the connection of antennas, antenna grounding switch structures, and devices that enable antennas to work in different bands at the same time. It can solve the problems of narrow impedance bandwidth of multi-frequency antennas and achieve good radiation characteristics and wide impedance bandwidth. Effect
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specific Embodiment approach 1
[0043] Specific implementation mode one: combine figure 1 Describe this embodiment, the tri-band antenna based on CSRR and LHTL described in this embodiment, the antenna includes a complementary split ring resonator CSRR (Complementary Split Ring Resonator), a left-handed transmission line LHTL (Left Handed Transmission Line), a coplanar waveguide CPW3, two triangular impedance matching units 4, two virtual floors 5 and a dielectric board 6;
[0044] Complementary split ring resonator CSRR, left-handed transmission line LHTL, coplanar waveguide CPW3, two triangular impedance matching units 4 and two virtual floors 5 are all coated on the upper surface of the dielectric board 6; the antenna is centered on the midline of the dielectric board 6 Axisymmetric structure;
[0045] The complementary split ring resonator CSRR includes an outer square metal ring 1-1, an inner square metal ring 1-2, a first metal rod 1-3, a first square metal sheet 1-4 and a second metal rod 1-5;
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specific Embodiment approach 2
[0053] Specific implementation mode two: combination Figure 4 to Figure 14 Describe this embodiment. This embodiment is a further limitation of the tri-band antenna based on CSRR and LHTL described in Embodiment 1. The left-hand transmission line LHTL includes interdigitated capacitors 2-1 and 14 metal rods 2-2 and The second square metal sheet 2-3;
[0054] The second square metal sheet 2-3 is arranged on the lower surface of the dielectric plate 6, the position of the second square metal sheet 2-3 on the dielectric plate 6 corresponds to the position of the first square metal sheet 1-4, and the shape and size are the same ;
[0055] The 14 metal rods are divided into two groups, and the two groups of metal rods are arranged in a row at equal intervals, respectively inserted into both sides of the first square metal sheet 1-4, and pass through the first square metal sheet 1-4, and the interdigitated capacitor 2-1 is arranged on the upper surface of the first square metal s...
specific Embodiment approach 3
[0063] Specific implementation mode three: combination image 3 and Figure 4 Describe this embodiment. This embodiment is a further limitation of the tri-band antenna based on CSRR and LHTL described in the second specific embodiment. In this embodiment, the side length a of the outer square metal ring 1-1 is 11mm , with a width of 1mm;
[0064] The side length b of the inner square metal ring 1-2 is 7.6mm, and the width is 0.3mm;
[0065] The side length c of the square metal sheet 1-4 is 5.6mm.
[0066] The finger width p=0.45mm of the interdigitated capacitance, length L 5 =2.6mm, the width of the gap between two adjacent fingers q=0.25mm; the diameter D=0.4mm of the metal rod; the cross-section of the dielectric plate 6 is a square, and its side length L 1 =20mm, dielectric constant ε r =4.4; the length of the triangular impedance matching unit 4 is L 4 =1.77mm; the width L of the virtual floor 5 3 = 5.56mm; the width w of the planar waveguide CPW 3 = 1.48mm,
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