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A new miniature double-notch design of ultra-wideband antenna

In Electronic Infomation Category: A | on April 20,2011

With indoor high-speed wireless data access technology, wireless communication systems requires greater data throughput. In particular, raised the standard distribution IEEE802.15.3a 3.1 ~ 10.6 GHz UWB frequency band to use, ultra-wideband communication systems and TL1451CNSR datasheet and more attention. Taking into account the design requirements of the previous antenna, UWB antenna requires not only the antenna with small size, good radiation efficiency, all the coverage characteristics, while avoiding interference with other communication systems, mainly the communication frequency band overlapping WLAN (5.2 ~ 5.8 GHz ), WIMAX (3.3 ~ 3.6 GHz), and TL1451CNSR price and c-band (3.7 ~ 4.2 GHz) radar, communications systems, UWB antennas can achieve miniaturization and TL1451CNSR suppliers and two stop-band performance has become the focus of the study.

Microstrip antenna with its thin profile, small size, light weight, can be compared with the carrier surface conformal, easy integration, low cost, easy to make and so much attention, often including small UWB printed monopole antenna child and wide slot antenna. From the above background, this paper designed a double-U gap UWB antenna, bandwidth 2.97 ~ 12.75 GHz (VSWR

Based on the experience of a large number of simulation experiments to obtain specific results of the antenna parameters. Through physical measurements, shows the basic antenna performance are met, is a practical significance of the UWB antenna.

1 antenna design

Specific size structure of the antenna shown in Figure 1. Circular radiant panel, printed microstrip feeder and floor plate in the same side of FR4 dielectric, FR4 dielectric thickness h = 1.0 mm, relative dielectric constant r = 4.4, size 20.0 mm 27.0 mm 1.0 mm. Feeder width is designed to W3 = 5 mm ports with 50 matching. Among them, the antenna size is: W = 20 mm, L = 27 mm, R = 10 mm, W1 = 8 mm, W2 = 3.5 mm, W3 = 5.0 mm, L1 = 10mm, L1 = 10.2 mm, L2 = 7.8 mm, s1 = 0.8 mm, s2 = 1 mm, s3 = 0.6 mm.

Figure 1 Schematic diagram of the specific dimensions of the antenna

(1) floor standing wave of the antenna.

UWB based on circular antenna radiation plate theory has been widely used. Super broadband antenna radiation paper plate with a circular radiant panel, the antenna design used in the new laminate flooring, it is composed of two semi-oval pass, by adjusting the radius and the length of the main ellipse axis ratio, high frequency impedance matching can be achieved ( VSWR

In antenna design to achieve the miniaturization of the antenna can be made by adjusting the parameters of the floor in Bo Bite of the antenna to meet the design requirements. The width of the antenna design W = 20 mm case, the simulation results in the main radius of the ellipse 4.9mm, as shown in Figure 2, to achieve a small antenna design.

Figure 2 VSWR characteristics change with the W1

(2) U-type slot antenna standing wave effects.

Feeder and radiation through the double U-slot board design to achieve a two-notch sex. Figure 3 shows the design of the antenna VSWR of cut. It can be seen from the figure, the antenna bandwidth 2.97 ~ 12.75 GHz, UWB has exceeded the bandwidth given by 3.0 ~ 10.6 GHz. Corrosion and radiation board in the feeder gap width of U-set S1, S2 and S3, a direct impact on the size of stop-band bandwidth. Design compared with the literature, they are open gaps in the radiation plate, this design can stimulate new board in the radiation resonance effect of the current play. This opened the two U-gap, can produce double-resonance effect.

Figure 3 before and after cut of the antenna in Bo Bite 2

gap opened in the radiant panel and the connection part of the feeder, its design features that not only have a resonance, but also to the radiation plate current feeder current role played match. When changing the position of gap 2, you can reduce the feeder and radiation between the reflective plate, adjust the size of the standing wave ratio.

Simulation center of the resonant frequency was found in the length of the gap L1, L2 direct impact, changing the length of short-term, the center frequency becomes larger, or the opposite. By analyzing know the nature of the role of the gap is equivalent to 1 / 2 wavelength resonator. On this basis, through simulation and optimization to achieve the desired impedance characteristics shown in Figure 4. Processing, width

Figure 4 VSWR with the L1, L2 changing nature

2 Analysis

Physical antenna shown in Figure 1. Antenna simulation using Ansofts high frequency simulation software HFSS11, antenna VSWR measurement using the Agilent E8363B network analyzer. VSWR simulation results and measurement results of the comparison in Figure 5. Measurement results show that the bandwidth of the antenna, 2.97 ~ 12.75 GHz (VSWR


Figure 5 the simulation results and measurement results of the comparison

Order to investigate the work in the whole band antenna radiation characteristics, measurement of the operating frequency is 3 GHz, 6 GHz and 9 GHz when the E plane and H plane antenna radiation pattern, specifically shown in Figure 6. H-plane antenna radiation pattern with good omnidirectional characteristics of roundness

Figure 6, the antenna 3 GHz, 6 GHz and 9 GHz when the pattern

3 Conclusion

This paper, a new type of small UWB slot antenna. Notch is determined by the board in the feeder and radiation for two U-gap, the introduction of half-wavelength resonant structure obtained. HFSS11 through the simulation of electromagnetic simulation software to determine the geometry of the antenna. The antenna in the anechoic chamber in the physical characteristics of the sample reflected the input, such as radiation pattern measurements. The results showed that the antenna simulation data and real data are in good agreement, the antenna in the 2.97 ~ 12.75 GHz band range with a good impedance characteristics, radiation pattern characteristics, 3.35 ~ 4.00 GHz and 5.23 ~ 5.82 GHz range within a notch, reducing the UWB antennas and other possible interference between communication systems, it is a good performance, with a smaller use value UWB antenna.

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