CN103560318B - A kind of miniaturized directed radiation printed antenna - Google Patents

Abstract

The invention discloses a miniaturized directional radiation printing antenna. The lower end of the double-folded inverted L-shaped conductive trace is connected to the feed conductive trace, the parasitic radiation unit is arranged in the space directly above the double-folded inverted L-shaped conductive trace, and the metal floor is arranged on the The back side of the feeding conductive trace; the double-folded inverted L-shaped conductive trace is bent multiple times by a metal wire with a length equal to three-quarters of the working wavelength to form a space electromagnetic field excitation structure with two parallel long conductors. The invention adopts a double-folded inverted L-shaped space excitation structure, which can obtain ideal directional radiation characteristics, increases the parasitic radiation unit, enhances the forward radiation gain of the antenna, utilizes the principle of spatial mutual coupling, and adopts antenna close-packing technology to compress The size of the antenna is reduced, and the printed planar antenna technology is adopted. The radiator and the ground are in a plane parallel to each other, which makes full use of the equipment space and facilitates the integration of the antenna and the circuit board.

Description

A Miniaturized Directional Radiation Printed Antenna

technical field

The invention belongs to the technical field of electronic communication, in particular to a miniaturized directional radiation printed antenna.

Background technique

With the in-depth research and development of wireless communication technology, the performance of communication systems has been continuously improved, and the refined design of antennas has begun to be concerned and valued by researchers to meet the various needs of new application features and performance improvements. For current and future mobile terminal equipment, the development trend is that the volume will become smaller and smaller, and the appearance will become more and more beautiful, while the performance must be maintained or even improved, which puts strict and even harsh requirements on the antenna design. In traditional antenna design, based on the basic antenna prototype, reducing the size of the antenna will be at the expense of other performances of the antenna. The idea of implementing fine antenna design is to grasp the special points of different applications, carry out a new design of the antenna structure, balance the performance of the antenna, and realize the optimal antenna design scheme.

Compared with the omnidirectional radiation antenna, the directional radiation antenna means that the radiation of the antenna has obvious directionality. In the traditional directional antenna design, structural adjustment and modification are often based on two prototype antennas, the microstrip antenna and the symmetrical dipole plus reflector, to meet specific application requirements. In occasions with higher requirements for directivity, an antenna array composed of multiple antenna elements may also be used. For fixed terminal equipment, since there are not many restrictions on the size and weight of the antenna in the application, most of the traditional directional antenna designs can be used. In the design of antennas for portable mobile terminal equipment, the handheld RFID readers designed with traditional microstrip antennas and symmetric dipole antennas are too bulky, and even need to add additional modules to provide suitable space and angle to assemble the antenna. Obviously, the volume of the device is increased, and the portability and aesthetics of the device are reduced. However, the miniaturized omnidirectional radiation antenna is designed to passively meet the limited space size and structure requirements, which leads to the deterioration of the antenna index, and the situation of insufficient working distance and poor signal quality in some wireless application systems. Proposing an antenna with directional radiation characteristics and small size, which can meet the requirements of equipment integration and ergonomic design, is bothering the designers.

Contents of the invention

The purpose of the present invention is to provide a miniaturized directional radiation printed antenna, which aims to solve the problem that it is difficult to have both directional radiation characteristics and the advantages of small size in the design of portable mobile terminal equipment antennas, and it cannot satisfy both equipment integration and Anthropomorphic design needs issues.

The present invention is achieved in this way, a miniaturized directional radiation printed antenna, the miniaturized directional radiation antenna includes: feeding conductive trace, double-folded inverted L-shaped conductive trace, parasitic radiation unit, metal floor; double-folded inverted L The lower end of the shaped conductive trace is connected to the feeding conductive trace, the parasitic radiation unit is set in the space directly above the double-folded inverted L-shaped conductive trace, and the metal floor is set on the back of the fed conductive trace; the double-folded inverted L-shaped conductive trace is composed of A metal wire with a length equal to three quarters of the working wavelength is bent multiple times to form a space electromagnetic field excitation structure with two parallel long conductors.

Further, the parasitic radiation unit has a narrow and long linear or bent structure, placed directly above the double-folded inverted L-shaped conductive trace, and can be placed on the same piece or different from the double-folded inverted L-shaped structure through circuit board printing technology. A dielectric board can also be formed by processing a metal line/surface structure, and then fixed on the double-folded inverted L-shaped conductive trace.

Further, the feeding conductive trace adopts a microstrip line, a twin wire, a coaxial transmission line, a coplanar waveguide transmission line or a stripline transmission line.

Further, the miniaturized directional radiation printed antenna adopts antenna close-packing technology to reduce the longitudinal size. The specific method is as follows:

Compress the distance between the parasitic radiation unit and the radiation unit to less than 0.03λ ₀ , and adjust the width of the distance between the two parallel long conductors in the double-folded inverted L-shaped conductive trace and the distance between the lower conductor and the upper edge of the metal floor to achieve antenna impedance matching .

The miniaturized directional radiation printed antenna provided by the present invention adopts a double-folded inverted L-shaped space excitation structure, which can obtain ideal directional radiation characteristics, increases the parasitic radiation unit, enhances the forward radiation gain of the antenna, and utilizes the principle of spatial mutual coupling , using antenna close-packing technology, which compresses the space and reduces the size of the antenna. Using printed planar antenna technology, the radiator and the ground are in a plane parallel to each other, making full use of the equipment space and facilitating the integration of the antenna and the circuit board.

Description of drawings

Fig. 1 is a schematic structural diagram of a miniaturized directional radiation printed antenna provided by an embodiment of the present invention.

In the figure: 1. Feed conductive trace; 2. Double folded inverted L-shaped conductive trace; 3. Parasitic radiation unit; 4. Metal floor.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Fig. 1 shows the structure of a miniaturized directional radiation printed antenna of the present invention, comprising: feed conductive trace 1, double-folded inverted L-shaped conductive trace 2, parasitic radiation unit 3, metal floor 4; The lower end of the inverted L-shaped conductive trace 2 is connected to the feed conductive trace 1, and an independent narrow and long parasitic radiation unit with a length of about one-third of the working wavelength is introduced at the central axis of the space above the double-folded inverted L-shaped conductive trace 1 3. To play the role of guiding electromagnetic energy in space, the metal floor 4 is arranged on the back of the feeding conductive trace 1, and the upper edge of the metal floor is at the same level as the upper edge of the feeding conductive trace.

The double-folded inverted L-shaped conductive trace 2 is made of a metal wire with a length equal to three-quarters of the working wavelength, which is bent multiple times to form a space electromagnetic field excitation structure with two parallel long conductors as the main feature. The double-folded inverted L-shaped conductive trace The lower end of the trace 2 is directly connected to the feeding conductive trace 1, and the lower end of the feeding conductive trace 1 is directly connected to the signal circuit line to realize the feeding of the antenna. At the central axis of the space above the double-folded inverted L-shaped conductive trace 1, An independent narrow and long parasitic radiation unit 3 whose length is about one-third of the working wavelength is introduced to play the guiding role of space electromagnetic energy and realize the enhancement effect of the upper (forward) radiation;

The feeding conductive trace 1 is formed by using a microstrip line, but it can still be formed by other types of feeding wires, including but not limited to twin wires, coaxial transmission lines, coplanar waveguide transmission lines, and strip line transmission lines. The row technology realizes the reduction of the longitudinal size, and the specific method is to compress the distance between the parasitic radiation unit 3 and the double-folded inverted L-shaped conductive trace ₂ to below 0.03λ0, and adjust the parallel length of the two sections in the double-folded inverted L-shaped conductive trace 2. The width of the distance between the conductors and the distance between the lower conductor and the upper edge of the metal floor 4 and achieve antenna impedance matching;

The present invention adopts a double-folded inverted L-shaped space excitation structure, which can obtain ideal directional radiation characteristics, increases the parasitic radiation unit 3, enhances the forward radiation gain of the antenna, utilizes the principle of spatial mutual coupling, adopts antenna close-packing technology, and compresses The space is reduced, the size of the antenna is reduced, and the printed planar antenna technology is adopted. The antenna and the ground are in a plane parallel to each other, which makes full use of the equipment space and facilitates the integration of the antenna and the circuit board; the lateral dimension of the antenna radiation part is less than 0.37λ ₀ The size is less than 0.08λ ₀ (λ ₀ is the central operating frequency corresponding to the free space wavelength), while the corresponding size of the traditional symmetrical vibrator plus reflector antenna is 0.5λ ₀ and 0.25λ ₀ . The antenna test maximum gain of the present invention is 6.7dBi, while the theoretical maximum gain of the traditional symmetrical vibrator plus metal floor is 5.15dBi.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay any creative effort. Various modifications or deformations that can be made by labor are still within the protection scope of the present invention.

Claims (1)

1. a miniaturized directed radiation printed antenna, is characterized in that, this miniaturized directed radiation printed antenna comprises: feed conductive trace, twofold inverted L-shaped conductive trace, parasitic radiation element, metal floor;

Twofold inverted L-shaped conductive trace lower end connects feed conductive trace, at twofold inverted L-shaped conductive trace superjacent air space axis place, introduce the long narrow shape parasitic radiation element of independence that a length is 1/3rd operation wavelengths, play the guiding function of spatial electromagnetic energy, realize the enhancing effect of top radiation; Metal floor is arranged on the back side of feed conductive trace, and metal floor top edge and feed conductive trace upper edge are in same level height; Twofold inverted L-shaped conductive trace is equaled the wire of 3/4ths operation wavelengths through repeatedly bending, being formed the external electromagnetic field incentive structure with two sections of long conductors that are parallel to each other by length;

Parasitic radiation element adopts long narrow linear pattern or bending type, be positioned over directly over twofold inverted L-shaped conductive trace, be placed on same or different masses dielectric substrate by circuit board printing technology and twofold inverted L-shaped structure, also can be formed by processing metal line/face structure, then be fixed on above twofold inverted L-shaped conductive trace;

Feed conductive trace adopts microstrip line, two-conductor line, coaxial transmission line, coplanar waveguide transmission line or strip line transmission lines;

This miniaturized directed radiation printed antenna adopts antenna close-spaced technique to realize the reduction of longitudinal size, and concrete grammar is:

Parasitic radiation element and radiating element spacing are compressed to 0.03 λ ₀below, and to adjust in twofold inverted L-shaped conductive trace between two sections of parallel long conductors and the distance of lower conductor and metal floor top edge to reach Antenna Impedance Matching.