1 Introduction
Compared to the microstrip transmission line, the common waveguide transmission line has lower radiation leakage and smaller distribution parameters, which becomes more common in the field of single-chip microwave integrated circuits. Ultra-wideband technology has a high data transfer rate, suppressing multipath interference capabilities, etc., in a future communication system is a very potential solution. Since February 2002, the US Federal Communications Commission (FCC) will be divided into ultra-wideband (UWB) civil bands, and the design and application of UWB wireless communication systems has become popular research topics in the scientific community and engineering community.
High-speed wireless communication is moving towards broadband and miniaturization, and wireless mobile communication devices are increasingly capable of excellent performance and smaller dimensions. In such a system, an antenna used to receive and transmit signals is a key component. Suitable antenna design can reduce the difficulty of circuit design to a certain extent while improving system performance. In recent years, miniaturization antennas have received more and more attention. Reduce antenna size can usually be achieved by using a high dielectric constant material and an optimized antenna geometry. In the design of the miniaturized antenna, many structures such as plane monopole antennas, gap antennas, and dipole antennas can be used to achieve miniaturization requirements. This paper uses a coplanar waveguide feed structure and an H-type branch design with a new miniaturized ultra-wideband antenna, and the antenna is shown in Figure 1. The antenna size is 19241.6 mm3, within a frequency range of 3.3-12.1 GHz, the voltage stationary wave ratio of the antenna is less than 2, and has good broadband impedance matching characteristics.
Figure 1 Antenna structure diagram
2 antenna simulation and analysis
The antenna structure is shown in FIG. L2 and W2 are the length and width of the upper patch of the H-type branches, respectively, and L3 and W3 are the length and width of the intermediate patch of the H-type branches, respectively. L and W are the length and width of the antenna, respectively. Herein, a dielectric plate having a thickness H is 1.6 mm and a relative dielectric constant is 4.4 (FR4) is selected.
The common waveguide feed structure is matched with 50Ω impedance, the feeder width is 2.6mm, and the gap width G is 0.3 mm. The active photo of the antenna is shown in Figure 2.
Figure 2 Antenna physical map
In order to assess the performance of the antennas design this article, we simulate and analyze it with HFSS 12 simulation software. The optimal parameter value of the antenna is shown in Table 1.
Figure 3 shows the simulation and measurement results of the voltage stationary wave ratio (VSWR), which can be seen from the figure, the antenna impedance bandwidth is 8.8 GHz (3.3-12.1 GHz).
Table 1 Antenna Optimal Parameter Table
Parameter optimal value
L19MM
W24mm
L010mm
W016mm
L110mm
W11.8mm
L24MM
W21.5mm
L32.2mm
W31.5mm
D1.2mm
Figure 3 Antenna voltage stationbox
The antenna is shown in Fig. 4, the antenna is shown in Figure 4.
(A) 4GHz E surface direction map
(B) 4GHz H face direction map
(C) 7GHz E surface direction map
(D) 7GHz H surface direction map
(E) 10GHz E surface direction map
(F) 10GHz H face direction map
Figure 4 E-plane (Yoz plane), H-surface (Xoz plane) normalized radiation direction map
As can be seen from Fig. 4, the antenna designed herein has a good all-directed characteristic in the H-plane, and a good signal transmission and reception can be achieved at the H-plane. Figure 5 is a change curve of the antenna gain with the frequency, which we can find that the antenna gain is maintained above 3dB.
Figure 5 Antenna gain map
3 conclusions
This paper proposes a small size coplanar waveguide super wideband antenna having a size of 19241.6 mm3. The measurement shows that the antenna is in the 3.3-12.1 GHz band VSWR "2. Both different frequencies exhibit good H-plane full-to-directional radiation characteristics, and the gain in the full-band band can reach 3dB. Since only one layer of the dielectric board is used, the antenna is ideal for integrating into a small handheld ultra-wideband system. , Reading the full text, the technology area
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