Small ultrawide band antenna with trapped wave characteristic

Abstract

The invention discloses a small ultrawide band antenna with a trapped wave characteristic. The small ultrawide band antenna consists of a dielectric substrate (1) and metal coating layers positioned on the upper surface and the lower surface of the dielectric substrate (1), wherein a radiation unit (2), a microstrip feeder (4) and interdigital capacitance loading resonance rings (6) and (7) are arranged on the upper surface of the dielectric substrate; the microstrip feeder (4) consists of a microstrip line with characteristic impedance of 50 ohms and a microstrip line with characteristic impedance which is gradually changed linearly from 50 ohms; the two interdigital capacitance loading resonance rings (6) and (7) with different sizes are printed on two sides of the microstrip feeder and used for forming a trapped wave frequency band; and a metal floor consists of a rectangle (3) and a reversed L shape (5) and is printed on the lower surface of the dielectric substrate (1). The working frequency band of the antenna covers 3.1 to 10.6 GHz; interference signals of a plurality of narrowstrip frequency bands can be filtered as required by adjusting relevant parameters, and available frequency bands are retained; and the antenna has the advantages of wide frequency band, narrow attenuation band, miniaturization and strong anti-interference capacity.

Description

technical field [0001] The invention belongs to the field of antennas, in particular to a small ultra-wideband antenna with notch characteristics, which is applied to an ultra-wideband wireless communication system. Background technique [0002] Ultra-wideband UWB technology is a new type of wireless communication technology. It has the characteristics of high transmission rate, low power consumption, and simple system structure. It meets the needs of high-speed communication development and has been widely used. As a key component of UWB communication system, the characteristics of UWB antenna will directly affect the transmission performance of the system, so its research and design are of great significance. In 2002, the US Federal Communications Commission (FCC) approved 3.1-10.6GHz as the working frequency band of the ultra-wideband system, and there are inevitably some narrow-band interference signals, such as the wireless local area network WLAN in the frequency bands...

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Problems solved by technology

Another example is the patent application number 201020531935.X, and the Chinese patent titled "Ultra-Wideband Antenna with Notch Characteristic" proposes a UWB antenna with dual notch characteristics. The antenna consists of a microstrip The feeding rectangular radiating unit and the ground plane of the coplanar waveguide form two notched bands of 3.8GHz-6GHz and 7.5GHz-9GHz by etching double U-shaped slots and rectangular slots on the radiating unit and the floor respectively, but this The bandwidth of the notch frequency band in the invention is too wide, far beyond the frequency range of the interference signal, which undoubtedly leads to the reduction of the working frequency band of the ultra-wideband antenna itself

Another example is the document "Planar Ultrawideband Antennas With Multiple Notched Bands Based on Etched Slots on the Patch and / or Split Ring Resonators on the Feed Line, Yan Zhang, Wei Hong, Chen Yu, Zhen-Qi Kuai, Yu-Dan Don, and Jian -Yi Zhou, I EEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL.56, NO.9, SEPTEMBER2008″ designed an ultra-wideband antenna with three notch characteristics, and the radiation element of the antenna is a microstrip-fed circle Shaped monopole, by loading 3 pairs of open-loop resonators of different sizes on both sides of the feeder to form notches in the 2.24GHz-2.62GHz, 3.78GHz-4.03GHz and 5.94GHz-6.4GHz frequency bands, but the antenna uses 6 An open-loop resonator, the antenna is large in size, and the useful frequency band between the 5.2GHz and 5.8GHz frequency bands is also filtered out, resulting in a waste of frequency bands

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