Broad-band antenna

Abstract

The invention discloses a broad-band antenna, which mainly solves the problems of conventional antennas, i.e. insufficient bandwidth and complex structure. The invention introduces a transmission line parallel resonator into a dipole, the whole antenna comprises a metal floor, a radiating element, a circuit board and a coaxial cable, wherein the radiating element comprises a pair of radiating arms (4, 5), a metal branch (8) and a metal strip (7); the radiating arm (4) is perpendicularly connected with the metal strip (7), the radiating arm (5) is perpendicularly connected with the metal branch (8), and the radiating arms (4, 5) are respectively printed on the front and the back of the circuit board; the end of the metal branch is connected with the metal strip in a short-circuiting manner to form the transmission line parallel resonator, and the two radiating arms and the transmission line parallel resonator are formed into an equivalent band-pass filter, which ensures that the antenna has double-tuning property. The invention effectively broadens the bandwidth of the dipole of the conventional thin wire model, the radiation pattern can be kept regular in a frequency band design, and moreover, the broad-band antenna has a simple structure, and is easy to process.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a broadband antenna, which is used in a wireless communication system requiring a simple structure of the broadband antenna. Background technique [0002] With the development of wireless communication technology, spread spectrum and frequency hopping communication technologies are continuously applied to military and civilian communication systems. The application of these technologies puts forward higher and higher requirements for the bandwidth of the antenna in the system. How to use a simple antenna structure to obtain a higher antenna bandwidth has always been a hot and difficult issue in antenna research. [0003] The Journal of the International Institute of Electrical and Electronics Engineers (IEEE Transaction on Antennas and Propagation, VOL.55, NO.11, NOVEMBER 2007) introduced a broadband offset printed symmetric dipole antenna. The offset technology effe...

AI Technical Summary

Problems solved by technology

However, this antenna is designed with the VSWR less than 2.5, and its VSWR is too large

[0004] A broadband matching network proposed in Chinese Patent Application No. 200810225192.0 can greatly broaden the antenna bandwidth, but this antenna introduces a variety of damping networks, resulting in a decrease in antenna efficiency, which is not conducive to practical use

[0005] A broadband antenna unit proposed in Chinese Patent Application No. 200910246594.3. The structure of this cast symmetrical vibrator antenna is too complicated and requires high installation requirements, so it is not suitable for application scenarios that require a simple antenna structure.

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