CN103825102B - A kind of bus is the ultra broadband symmetry biconical antenna of composite curve - Google Patents

Abstract

The invention relates to an ultra-wideband symmetrical biconical antenna whose busbar is a composite curve, and relates to an ultrawideband symmetrical biconical antenna, in particular to an ultrawideband symmetrical biconical antenna whose busbar is a composite curve. The invention aims to solve the problem that the size and weight of the existing biconical antenna cannot give consideration to both high-frequency characteristics and low-frequency characteristics. The present invention comprises two frustum bodies, the two frustum bodies are arranged in an hourglass shape from top to bottom, and each frustum body consists of a first frustum body whose generatrix is a straight line and a second frustum whose generatrix is a binomial curve The top surface of the first frustum body is connected with the bottom surface of the second frustum body. The invention is used in the field of wireless communication.

Description

A UWB Symmetric Biconical Antenna with Composite Curve Bus

technical field

The invention relates to an ultra-wideband symmetrical biconical antenna, in particular to an ultra-wideband symmetrical biconical antenna whose busbar is a compound curve, and belongs to the field of wireless communication.

Background technique

At present, UWB technology is an important development direction in the field of wireless communication, and has become one of the hot issues and research directions in the field of communication at home and abroad in recent years. The reason why ultra-wideband technology has been widely concerned is mainly because of its advantages such as high transmission rate, low loss and large information capacity. The development of ultra-wideband technology also makes the design of ultra-wideband antennas more and more important. Up to now, various forms of ultra-wideband antennas have been proposed, and many of them have been used in practical projects.

As a common ultra-wideband antenna, biconical antenna has been widely used in wireless communication, SAR radar imaging, biomedicine and wireless spectrum detection. However, the impedance characteristics of ordinary finite-length biconical antennas are closely related to the size of the antenna, and the frequency of the low-frequency medium is relatively high, which cannot well cover the frequency bands used in modern communication systems. Therefore, in order to improve low-frequency characteristics, it is often necessary to increase the size of the antenna, and the weight of the antenna also increases sharply, which is not suitable for application; while to improve high-frequency characteristics, it is necessary to reduce the size of the antenna and increase the actual processing difficulty of the antenna. Therefore, it is difficult to obtain a small-sized, light-weight biconical antenna with a wide bandwidth.

Contents of the invention

In order to solve the problem that the size and weight of the existing biconical antenna cannot take into account both high-frequency characteristics and low-frequency characteristics, the present invention further proposes an ultra-wideband symmetrical biconical antenna whose busbar is a composite curve.

The technical scheme that the present invention takes for solving the above-mentioned problem is: the present invention comprises two frustum bodies, and two frustum bodies are arranged in an hourglass shape from top to bottom, and each frustum body is the first frustum body whose generatrix is a straight line It is composed of the second frustum whose generatrix is a binomial curve, and the top surface of the first frustum is connected with the bottom surface of the second frustum as a whole.

The beneficial effects of the present invention are: the present invention is simple in structure, small in size, can achieve good impedance matching in the VHF to microwave bands, not only retains the high-frequency characteristics of ordinary biconical antennas, but also passes the binomial curve part The radiation characteristics of the low frequency part have been improved. Compared with the ordinary conical antenna of the same size, the bandwidth is significantly increased, and the low-frequency cut-off frequency is lower, the omnidirectionality in the working frequency band is good, the gain is kept at about 3dBi, and the amplitude of the transmitted or received signal of the antenna does not change within the working bandwidth. It is large, has a linear phase, and has good group delay characteristics, so that the antenna's frequency domain characteristics and time domain characteristics can meet the requirements of broadband wireless communication, and it can be used as a generating antenna and as a receiving antenna. In summary, the present invention can be used in multiple systems in the field of wireless communication, SAR radar imaging, biomedicine, and wireless spectrum detection.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

detailed description

Specific embodiment 1: This embodiment is described in conjunction with FIG. 1. The ultra-wideband symmetrical biconical antenna whose busbar is a composite curve described in this embodiment includes two frustums, and the two frustums are hourglass-shaped from top to bottom. Setting, each frustum body is made up of the first frustum body 1 whose generatrix is a straight line and the second frustum body 2 whose generatrix is a binomial curve, the top surface of the first frustum body 1 and the second frustum body 2 The bottom surface is connected into one.

Specific embodiment two: illustrate this embodiment in conjunction with Fig. 1, a kind of bus bar described in this embodiment is the ultra-wideband symmetrical biconical antenna of compound curve, the geometric center of the second frustum body (2) bottom surface of following frustum body Be the origin, take the bottom surface of the second frustum body (2) of the frustum body below as the horizontal plane, set up x, y, z Cartesian coordinate system, when taking the z axis as the abscissa, the binomial curve satisfies The following formula:

In formula 1., a (z) represents a binomial curve, and a _i is half of the radius of the second frustum body 2 of the top frustum body, and a ₀ is the second frustum body of the above frustum body 2 half of the base radius, p=1.2, z represents the independent variable of the binomial curve, L represents the length of the entire curve.

The technical effect of this embodiment is: so set, the antenna can work in the frequency band range of 0.76GHz to 28.6GHz, the standing wave ratio is less than 2, and has better omnidirectional radiation characteristics, the gain of the present invention maintains in the entire working bandwidth At about 3dBi, when used as a transmitting or receiving antenna, the group delay remains within 1ns. Other components and connections are the same as those in the first embodiment.

Specific embodiment three: this embodiment is described in conjunction with Fig. 1, the top surface diameter r1 of the second frustum 2 of the upper frustum of an ultra-wideband symmetrical biconical antenna whose busbar is a compound curve described in this embodiment is 100mm , the bottom surface diameter r2 of the second frustum body 2 of the above frustum body is 40mm, the height h1 of the second frustum body 2 of the above frustum body is 40mm, and the first cone of the above frustum body The diameter r3 of the bottom surface of the frustum body 1 is 4 mm, the diameter of the top surface of the first frustum body 1 of the upper frustum body is 40 mm, and the height h2 of the first frustum body 1 of the upper frustum body is 10 mm. Other components and connections are the same as those in the first embodiment.

Embodiment 4: This embodiment is described with reference to FIG. 1 . The gap S between the two frustums of an ultra-wideband symmetrical biconical antenna whose busbar is a compound curve in this embodiment is 1 mm. Other compositions and connections are the same as those in the first, second or third embodiment.

Claims (3)

1. A kind of bus bar is the ultra-broadband symmetric biconical antenna of compound curve, and it comprises top frustum body and bottom frustum body, and described top frustum body and described bottom frustum body are arranged in an hourglass shape from top to bottom, Both the above frustum body and the bottom frustum body are composed of a first frustum body (1) whose generatrix is a straight line and a second frustum body (2) whose generatrix is a binomial curve. The top surface of the first frustum body (1) of the body is connected with the bottom surface of the second frustum body (2) of the upper frustum body, and the first frustum body (1) of the lower frustum body The bottom surface of the bottom surface is connected with the top surface of the second frustum body (2) of the lower frustum body, and it is characterized in that: the geometric center of the second frustum body (2) bottom surface of the lower frustum body is Origin, take the bottom surface of the second frustum body (2) of the frustum body below as the horizontal plane to establish x, y, z Cartesian coordinate system, when taking the z axis as the abscissa, the binomial curve satisfies the following formula : In formula 1., a (z) represents a binomial curve, and a _i is half of the radius of the second frustum body (2) top surface of the frustum body above, and a ₀ is the second cone of the frustum body above. Half of the radius of the base of the platform body (2), p=1.2 _, z represents the independent variable of the binomial curve, and L represents the length of the entire curve. 2. according to the described a kind of bus bar of claim 1 being the ultra-wideband symmetric biconical antenna of compound curve, it is characterized in that: the top surface diameter (r1) of the second frustum body (2) of said top frustum body is 100mm , the bottom surface diameter (r2) of the second frustum body (2) of the above frustum body is 40mm, and the height (h1) of the second frustum body (2) of the above frustum body is 40mm, and the The bottom surface diameter (r3) of the first frustum body (1) of the top frustum body is 4mm, and the top surface diameter of the first frustum body (1) of the top frustum body is 40mm, and the above frustum body The height (h2) of the first frustum (1) is 10 mm. 3. According to claim 1 or 2, the ultra-wideband symmetrical biconical antenna whose busbar is a composite curve, is characterized in that: the gap (S) between the upper frustum and the lower frustum is 1mm.