CN106229645A - A kind of double resonance molded breadth multiband dipole sub antenna - Google Patents

Abstract

The invention relates to the field of antennas, in particular to a broadband high-integration antenna based on multilayer circuit technology, and in particular to a double-resonance broadband dipole antenna. The antenna consists of two dipoles, a parallel pair of wires and a 50Ω planar transmission line. The entire antenna is fed vertically with parallel twin wires, fed by a 50Ω planar transmission line. The first dipole is biased by strip parallel twin wires. One of the parallel twin wires is connected to the feed line and the other is connected to ground. The second dipole is located above the first dipole and is indirectly fed by the aforementioned dipole to achieve double resonance. The invention realizes an impedance matching bandwidth of 33.6% (VSWR≤2), is very suitable for realization by adopting multi-layer circuit processing technologies such as LTCC and multi-layer PCB, and has a high degree of integration.

Description

A Dual-Resonant Broadband Dipole Antenna

technical field

The invention relates to the field of antennas, in particular to a broadband high-integration antenna based on multilayer circuit technology, and in particular to a double-resonance broadband dipole antenna.

technical background

Antenna is one of the essential equipment for various civil and military radio systems such as radio communication, broadcasting, navigation, radar, measurement and control, microwave remote sensing, radio astronomy, and electronic countermeasures.

In recent decades, the rapid development of science and technology and the increasing modernization and socialization of people's lives have put forward higher requirements for the application of electronic technology. In many application fields, such as television, broadcasting, telemetry, aerospace and satellite communication, etc., not only high-quality transmission of information is required, but also broadband of equipment is required. For this reason, in line with the development trend of radio equipment, the research on broadband antennas has become increasingly active and has become an important branch in the field of antenna research.

At the same time, the dipole antenna, one of many antenna types, is still widely used due to its simple structure and stable performance. However, the traditional dipole antenna impedance matching bandwidth is very small, usually no more than 10%. In order to improve the impedance matching bandwidth of dipole antennas, many researchers at home and abroad have made great efforts.

In 2003, L.D.Bakhrakh, V.F.Los and A.N.Shamanov designed a dipole antenna that utilizes coplanar waveguide coupled feed to achieve a wide impedance matching bandwidth (L.D.Bakhrakh, V.F.Los and A.N.Shamanov, "Ultrawideband method of feeding a dipole antenna," Antenna Theory and Techniques, 2003.4th International Conference on, 2003, pp.535-538vol.2.). In 2007, LidaAkhoondzadeh-Asl, Douglas J.Kern, Peter S.Hall and Douglas H.Werner realized a broadband dipole antenna by using the ground of the electromagnetic bandgap structure (L.Akhoondzadesh-Asl, D.J.Kern, P.S. Hall, and D.H. Werner, “Wideband dipoles on electromagnetic bandgap groundplanes,” IEEE Trans. Antennas Propag., vol.55, no.9, pp.2426–2434, Sep.2007.). In 2010, Fang-Yao Kuo, Hsi-Tseng Chou, Heng-Tung Hsu, Hsi-Hsir Chou and Paolo Nepa designed a dipole antenna, which is based on the traditional dipole, with a pair of shorter The dipole, and connected with the original dipole to achieve impedance matching, the dipole can achieve 100% impedance matching bandwidth (VSWR≤2) (F.Y.Kuo, H.T.Chou, H.T.Hsu, H.H.Chou, and P . Nepa, “A noveldipole antenna design with an over 100% operational bandwidth,” IEEE Trans. Antennas Propag., vol.58, no.8, pp.2737–2741, Aug.2010.). In 2013, Hui Chu, Yong-XinGuo, and Ziliang Wang, designed a broadband dipole linearly polarized antenna based on LTCC (H.Chu, Y.-X.Guo, and Z.Wang, “60-GHz LTCC wideband verticaloffcenterdipole antenna and arrays,"IEEE Trans.Antennas Propag.,vol.61,no.1,pp.153–161,Jan.2013.), the operating frequency band is 60GHz, which utilizes the circular gap in the inner layer Double resonance is realized, and the frequency band is broadened.

In the above literature, most of the dipole antennas use parallel feeding, that is, the antenna feeding network and the radiator are located on the same plane. This feeding method will lead to serious coupling between the feeding network and the radiator, and the last paper Although the dipole antenna reported in [10] is fed vertically, this method of broadening the frequency band is not suitable for feeding dipoles with microstrip lines, so it is not suitable for integration with other active devices. Moreover, most antennas adopt central feeding, and the overall structure is not conducive to integration.

Contents of the invention

In view of the above problems or deficiencies, in order to reduce the coupling between the feed network and the radiator, it is integrated with other active devices, and the overall structure is easy to integrate. The invention provides a dual-resonance broadband dipole antenna.

The dual-resonance broadband dipole antenna, as shown in Figure 1, contains two dipoles, parallel pairs of lines and a 50Ω planar transmission line.

The first dipole is fed vertically by parallel double wires, which are vertically connected to a 50Ω planar transmission line with a floor, and the floor is also used as a reflector for the dipole; the entire antenna is fed by the planar transmission line ; The 50Ω planar transmission line is located at the bottom of the antenna.

The first dipole (1) is bias-fed by parallel double wires (3), and one wire in the parallel double wires (3) is connected to the 50Ω planar transmission line ( 6), and the other wire connects to ground (5).

The second dipole (2) is a whole, located at the top of the antenna, a part of which is located directly above the first dipole (1), and the other part is located at the upper left of the first dipole (1), and both are parallel to each other , fed by the capacitive coupling of the first dipole to achieve double resonance.

The total length l ₁ of the first dipole is 0.55λ, λ is the wavelength of the electromagnetic wave in the medium at the center frequency, the width is 0.02-0.05λ and the same as the second dipole, and the bias ratio is 1.3 to 1 to 1.5 to 1 , the distance h ₃ from the ground (5) is 0.2-0.3λ.

The length of the second dipole is 0.5-0.6λ, the length directly above the first dipole ( ₁ ) is 0.2-0.4λ, and the vertical distance h2 from the first dipole is 0.05-0.06λ.

The parallel twins (3) are provided with additional disks of diameter _d2 , in order to ensure the electrical connectivity of the parallel twins made of multilayer stacked vias.

The dipole antenna provided by the invention realizes an impedance matching bandwidth of 33.6% (VSWR≤2); it is very suitable to be realized by multi-layer circuit processing technologies such as LTCC and multi-layer PCB, and has a high degree of integration.

Description of drawings

Fig. 1 is the perspective view of embodiment;

Fig. 2 is the top view of embodiment;

Fig. 3 is the side view of embodiment;

Fig. 4 is the |S ₁₁ | simulation result diagram of the embodiment;

Fig. 5 is the gain simulation result figure of embodiment;

Fig. 6 is the pattern simulation result figure of embodiment 28.5GHz;

Fig. 7 is the pattern simulation result figure of embodiment 35GHz;

Fig. 8 is the pattern simulation result figure of embodiment 40GHz;

In Figures 6, 7, and 8, a is the E-plane pattern, b is the H-plane pattern, the solid line represents the main polarization pattern, and the dotted line represents the cross-polarization pattern;

Reference signs: w ₁ is the line width of the feed microstrip line (6), w ₂ is the dipole width, l ₁ is the total length of the first dipole (1), and l ₂ is the first dipole (1) ) long arm length, l ₃ is the length of the short arm of the first dipole (1), l ₄ is the length of the second dipole (2), d ₁ is the diameter of the circular notch (4) of the inner layer, and d ₂ is The diameter of the additional disc of the parallel double wire (3), d ₃ is the diameter of the parallel double wire (3), h ₁ is the total thickness of the antenna, h ₂ is the distance between the second dipole (2) and the first dipole (1) Vertical distance, h ₃ is the distance between the first dipole and the inner ground (5).

specific implementation plan

The present invention will be described in detail below in conjunction with the accompanying drawings and examples. This example adopts LTCC multi-layer circuit processing technology, the substrate material is FerroA6M, the dielectric constant is 5.9, the thickness of each substrate is 0.094mm, the thickness of each metal layer is 0.01mm, the surface metal is gold, and the inner metal is silver. The working frequency band of the antenna is the Ka band.

The dual-resonance broadband dipole antenna of the present invention has 14 layers in total, that is, h ₁ =0.094mm×14=1.316mm. Wherein, the first dipole (1) is located on the front of the third layer of medium, and the second dipole (2) is located on the front of the first layer of medium, that is, the top layer.

The parallel double lines (3) are multi-layer stacked metallized through holes, one of which penetrates 3 to 14 layers of dielectric and is connected to the 50Ω microstrip line (6) through the circular gap (4) in the inner layer ground (5), The other penetrates through 3 to 10 layers of media and is connected to the inner ground (5). The inner ground (5) is located on the front of the 12th layer medium. The 50Ω microstrip line is located on the back of the 14th layer dielectric, that is, the back of the bottom layer. As shown in Figure 1.

In conjunction with Fig. 2, 3, the specific size of the double resonant type broadband dipole antenna of the present invention is as shown in the following table (unit: mm):

Table 1

For the parameter test comparison data of this embodiment, refer to Figs. 4-8.

Claims (5)

1. a double resonance molded breadth multiband dipole sub antenna, comprises two dipoles, parallel wire and 50 Ω planar transmission lines, its It is characterised by:

First dipole, used parallel wire vertically to feed, and this parallel wire vertically connects the 50 Ω planar transmission with floor Line, this floor is i.e. also as the reflecting plate of dipole；Whole antenna is fed by this planar transmission line；50 Ω planar transmission Line is positioned at antenna bottom；

First dipole, was carried out offset-fed by parallel wire, and the circumferential notch that the single line in this parallel wire is arranged with passing through connects To 50 Ω planar transmission lines, another single line connects ground；

Second dipole was an entirety, was positioned at antenna the top, and one part is positioned at directly over the first dipole, another part position In dipole upper left side, and both are parallel to each other, by the first dipole Capacitance Coupled feed, it is achieved double resonance；

First dipole total length l₁Be 0.55 λ, electromagnetic wave wavelength in media as well at frequency centered by λ, width be 0.02～ 0.05 λ and the second dipole, are identical, and offset-fed ratio is 1.3 to 1～1.5 to 1, distance h on distance ground₃It is 0.2～0.3 λ；

Second dipole length is 0.5～0.6 λ, and it is positioned at a length of 0.2～0.4 λ directly over the first dipole, distance Vertical dimension h of one dipole₂It is 0.05～0.06 λ.

2. double resonance molded breadth multiband dipole sub antenna as claimed in claim 1, it is characterised in that: described parallel wire is many layer stack Folded plated-through hole.

3. double resonance molded breadth multiband dipole sub antenna as claimed in claim 2, it is characterised in that: described parallel wire is provided with diameter d₂Additional disc, it is ensured that the electrical connectivity of parallel wire.

4. double resonance molded breadth multiband dipole sub antenna as claimed in claim 1, it is characterised in that: described 50 Ω planar transmission lines are 50 Ω microstrip lines.

5. double resonance molded breadth multiband dipole sub antenna as claimed in claim 1, it is characterised in that: there is the impedance matching of 33.6% Bandwidth VSWR≤2, the multilayer circuit technology processing of employing realizes, and its vertical component uses multiple-level stack metallization via to realize, water Flat part uses type metal to realize.