A Broadband Printed Dipole Antenna with Novel Branch Line Integrated Feed Balun

Abstract

The invention discloses a novel broadband printed dipole antenna with a branch wire integrated with a feed balun. The novel broadband printed dipole antenna comprises an SMA (Shape Memory Alloy) joint, a dielectric-slab, a radiating element and a microstrip line feed integrated balun, wherein the radiating element is provided with a slotting seam; dual radiation arms are formed on both sides of the slotting seam; the microstrip line feed integrated balun is provided with a branch wire; the branch wire is equivalent to a series resistor, and is used for improving the matched impedance. According to the novel broadband printed dipole antenna, the VSWR (Voltage Standing Wave Ratio) is less than or equal to 1.5, and the relative bandwidth is up to 58.7 percent (1.65-3.0GHz); compared with other bandwidth extension technologies (such as a parasitic patch increasing technology), the novel broadband printed dipole antenna has the advantages that design is made on the basis of not changing the original size of the antenna, so that the bandwidth of the antenna is improved, other performance of the antenna (such as gain and cross polarization level) is not influenced, and the occupied space is reduced; the novel broadband printed dipole antenna has the advantages of simple structure, convenience, practicability, wide adaptability and the like.

Description

technical field [0001] The invention relates to the technical field of antenna engineering, in particular to a novel wideband printed dipole antenna with a branch line integrated feed balun, which is used for antennas of mobile communication equipment or elements of array antennas. Background technique [0002] With the rapid development of radio communication technologies, such as 2G GSM1800 and GSM1900, 3G (CDAM-2000, WCDMA and TD-SCDMA) and LTE, the communication frequency bands of these communication systems are mainly 1.7-2.8 GHz. The dipole structure antenna is widely used in antenna engineering technology. Its structure is simple and easy to implement, and it can work alone as an antenna, or as an antenna element of an antenna array. The printed dipole antenna fed by the microstrip balun structure is widely used in various wireless communication systems because it can provide a large bandwidth, and has the advantages of small size, light weight, low cost, easy integr...

AI Technical Summary

Problems solved by technology

Lu Xiaopeng of China Electricity 38 Research Institute introduced a parallel compensation capacitor "Novel broadband printed dipole" through a low-impedance open line in the microstrip balun (Microwave and Optical Technology Letters, Vol.48, no.10, pp.1996–1998, Oct.2006), its VSWR≤1.5 (1.35-2.35GHz) impedance bandwidth reaches 49.5%, but its microstrip balun is placed in the middle of the gap, which is not conducive to the array design of the cross structure

In the design of "A Wideband Magneto-Electric Dipole Antenna" (IEEETransactions on Antennas and Propagation, Vol.60, no.11, pp.4987-4991, Nov.2012), Ge Lei et al. of the City University of Hong Kong fed the metal structure The electric balun is designed as a trapezoidal structure, so that the vertical part of the balun and the radiation dipole forms a capacitive effect to compensate the inductance of the radiation arm, and its VSWR≤2.0 (1.65-4.65GHz) impedance bandwidth reaches 95.2%. This method also verifies the introduction of Effectiveness of capacitive compensation for bandwidth extension, but not for printed dipole antenna designs

In addition, there are other design methods to expand the bandwidth, but they are not universally applicable, and the design methods are cumbersome, which is not conducive to the miniaturization and simplification of the antenna design.

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