Ultra wideband antenna integrated with stepped impedance tuning bar

Abstract

The invention aims at providing an ultra wideband antenna integrated with a stepped impedance tuning bar; the ultra wideband antenna comprises a medium base plate, a radiating element, a stepped impedance tuning bar, a coplanar waveguide feed signal strip line and a coplanar waveguide ground plane, wherein the radiating element, the stepped impedance tuning bar, the coplanar waveguide feed signal strip line and the coplanar waveguide ground plane are arranged on the medium base plate; the coplanar waveguide feed signal strip line and the coplanar waveguide ground plane form a coplanar waveguide feed structure; the radiating element is arranged in the coplanar waveguide ground plane; the radiating element and the coplanar waveguide ground plane form a wide groove structure; and the stepped impedance tuning bar comprises a first stepped impedance tuning bar and a second stepped impedance tuning bar, wherein the first stepped impedance tuning bar is integrated on the radiating element, and the stepped impedance tuning bar is integrated on the coplanar waveguide ground plane. According to the ultra wideband antenna, the mutual interference between an ultra wideband communication system and the traditional narrowband system can be reduced, and the cooperative communication between the two systems is realized.

Description

technical field [0001] The invention relates to a planar printed board antenna. Background technique [0002] With the rapid development of wireless communication technology, people's demand for wireless communication is getting stronger and stronger. Especially in 2002, since the U.S. Federal Communications Commission (FCC) announced 3.1GHz-10.6GHz as the ultra-wideband communication frequency band, ultra-wideband communication technology has become one of the hot topics for domestic experts and scholars. Ultra-wideband antennas are used as ultra-wideband communication systems. An important part of it has also been extensively studied by experts at home and abroad. However, the current equipment is developing towards miniaturization and broadband communication. As an important part of wireless communication, the design of ultra-wideband antenna and bandpass filter is an important part of wireless communication. Therefore, the design of ultra-wideband antenna and bandpass ...

AI Technical Summary

Problems solved by technology

Usually this method will cause the mismatch between the antenna and the microwave circuit, and even reduce the overall performance of the system, so designing an ultra-wideband antenna with notch characteristics is one of the important methods to solve this problem

At the same time, some shortcomings of the existing UWB antennas are solved: (1) Most of the current UWB antennas use microstrip monopole antennas or coplanar waveguide-fed monopole antennas, and the size of these antennas is relatively large

In recent years, although ultra-wideband antennas based on slot antennas can meet the application requirements of UWB (3.1GHz-10.6GHz), the feeding method of these antennas and the combined size of slot lines require high machining accuracy, which is not convenient for actual debugging and production.

(2) At present, most ultra-wideband antennas usually need to drill holes during system integration, and use reactive elements to connect to the RF front-end, so the complexity of the system is increased, the performance of the system is reduced, and the needs of miniaturization cannot be met.

(3) In recent years, most of the ultra-wideband antennas with notch characteristics proposed by the academic circles mostly adopt the etching of various slots on the ground plane and the radiation element to realize the notch characteristics, so the etching The slot will produce electromagnetic wave leakage and affect the radiation pattern of the antenna

Literature "Design of a new UWB integrated antenna filter with a rejected WLAN band at 5.8GHz, A.Djaiz, M.Nedil, M.A.Habib and T.A.Denidni. Microwave and Optical Technology Letters, Vol.53, No.6, 2011", This paper adopts the design of narrow-band bandpass filter on the feeder to realize the notch characteristic, but this scheme can only realize a single notch characteristic, and the notch frequency is not easy to adjust

[0005] To sum up, currently proposed UWB antennas mainly adopt the form of monopoles to achieve UWB characteristics. In order to realize the compatibility between UWB systems and currently used narrowband Integrated filter, etching various grooves on the radiating element to suppress out-of-band signals and spurious signals, but the above technology increases the volume of the antenna, and etching various grooves on the antenna suppresses out-of-band signals and spurious signals The method of spurious signal destroys the shape of the radiation element of the antenna, thereby causing electromagnetic wave leakage and affecting the radiation pattern of the antenna

[0006] In order to further improve the radiation characteristics of the antenna and at the same time realize the cooperative work of the ultra-wideband communication system and the currently used narrowband system, the document "Small Square Monopole Antenna for UWB Applications with Variable Frequency Band-Notch Function, M.Ojaroudi, G.Ghanbari, N .Ojaroudi, C.Ghobadi, IEEE Antenna and Wireless Propagation Letters, 2009, Vol.8, pp.1061-1064." and the literature "Compact Monopole Antenna with Band-notched Characteristic for UWB Applications, H.W., Liu, C.H., Ku, T.S., Wang, C.F., YANG, IEEE Antenna and Wireless Propagation Letters, 2010, pp.397-400" proposed a method of using tuned microstrip lines to realize trapping. These two antennas use microstrip feeding methods, but The size of the antenna is large, and there are many parameters that need to be adjusted, which is not convenient for actual production

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