CN105846085A - Coplanar waveguide feed capacitor loading slot antenna - Google Patents

Abstract

A slot antenna loaded with a coplanar waveguide feeding capacitance relates to a slot antenna, which includes a dielectric substrate (1), a metal ground (2) and a radiation slot (3) on the dielectric substrate (1), and a coplanar waveguide feeder (4); radiation slots (3) are arranged on the metal ground (2); the two ends (6) of the radiation slots (3) are short-circuited; on the two edges of the radiation slots (3), there are several capacitors (7) The parallel connection is connected at its edge; one end of the coplanar waveguide feeder (4) is the port (8) of the antenna, and the conductor (9) at the other end of the coplanar waveguide feeder (4) crosses the radiation slot (3). The edge (10) of the seam (3) is connected with the metal ground (2). The antenna can reduce antenna size, cross polarization.

Description

Coplanar waveguide fed capacitively loaded slot antenna

technical field

The invention relates to a slot antenna, in particular to a slot antenna loaded with a coplanar waveguide feeding capacitance.

Background technique

The slot antenna is the dual antenna of the dipole antenna and has a wide range of applications. However, the ordinary slot antenna not only needs half the wavelength of the radiation slot itself, but also needs a large metal ground area around the radiation slot, usually the length of the metal ground is 1/2 larger than the length of the slot One wavelength, the width of the metal ground is one-half wavelength larger than the width of the slot. A larger metal ground will make the slot antenna unsuitable for multiple-input multiple-output (MIMO) applications, resulting in poor cross-polarization of the antenna, which will lead to a decrease in spectral efficiency and channel capacity. At the same time, the impedance of the slot is very large, which also makes it difficult to match the impedance of the slot antenna feeding transmission line.

Contents of the invention

Technical problem: The purpose of this invention is to propose a slot antenna with coplanar waveguide feeding capacitive loading, which can reduce the length of the radiation slot and the area of the metal ground, and has the effect of suppressing cross polarization.

Technical solution: The capacitively loaded slot antenna with coplanar waveguide feeding of the present invention includes a dielectric substrate, a metal ground and a radiation slot arranged on the dielectric substrate, and a coplanar waveguide feeder line; one side of the dielectric substrate is a metal ground and a coplanar waveguide Feeder, the ground plane of the coplanar waveguide feeder is the metal ground; there are radiation slots on the metal ground, the shape of the radiation slots is rectangular, and the radiation slots are located in the center of the metal ground; the two ends of the radiation slots are short-circuited; It is connected to the two edges of the radiation slot, so that the characteristic impedance of the radiation slot becomes lower; one end of the coplanar waveguide feeder is the port of the antenna, and the conductor at the other end of the coplanar waveguide feeder crosses the radiation slot. Edge, connected to metal ground.

By changing the quantity, capacitance and spacing of the loading capacitors, the characteristic impedance of the radiation slot can be adjusted, and the working frequency of the antenna, the width of the working frequency band and the electrical length of the radiation slot can be changed.

Capacitors are loaded in parallel to the two edges of the radiation slot, which not only reduces the characteristic impedance of the slot transmission line to easily match the feed transmission line, but also reduces the phase velocity of the slot transmission line, reducing the length of the half-wavelength radiation slot. Small, realize the miniaturization of the radiation slot and the antenna. The operating frequency of the slot antenna loaded by the coplanar waveguide feeding capacitance is mainly determined by the resonant frequency of the radiation slot, but the size of the metal ground and the position where the coplanar waveguide feeder conductor connects to the radiation slot can also affect the antenna's operating frequency and Adjust the degree of matching.

Beneficial effect: the beneficial effect of the capacitively loaded slot antenna fed by a coplanar waveguide of the present invention is that the antenna can reduce the electrical size of the entire antenna, realize miniaturization, and at the same time have the effect of suppressing the cross polarization of the antenna.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a slot antenna loaded with a coplanar waveguide feeding capacitance.

In the figure there are: a dielectric substrate 1, a metal ground 2, a radiation slot 3, a coplanar waveguide feeder 4, a ground plane 5, two ends 6, a capacitor 7, a port 8, a conductor 9 and an edge 10.

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

The embodiment adopted in the present invention is: the coplanar waveguide feeding capacitively loaded slot antenna includes a dielectric substrate 1, a metal ground 2 and a radiation slot 3 arranged on the dielectric substrate 1, and a coplanar waveguide feeder 4; the dielectric substrate 1 One side is the metal ground 2 and the coplanar waveguide feeder 4, the ground plane 5 of the coplanar waveguide feeder 4 is the metal ground 2; there is a radiation slot 3 on the metal ground 2, the shape of the radiation slot 3 is a rectangle, and the radiation slot 3 Located in the center of the metal ground 2; the two ends 6 of the radiation slot 3 are short-circuited; several capacitors 7 are connected in parallel across the two edges of the radiation slot 3, so that the characteristic impedance of the radiation slot 3 becomes lower; the coplanar waveguide feeder 4 One end of the antenna is the port 8 of the antenna, and the conductor 9 at the other end of the coplanar waveguide feeder 4 crosses the radiation slot 3 and is connected to the metal ground 2 at the edge 10 of the radiation slot 3 .

Changing the number, capacitance and spacing of the loading capacitors 7 can adjust the characteristic impedance of the radiation slot 3 , and can change the operating frequency of the antenna, the width of the working frequency band and the electrical length of the radiation slot 3 .

The operating frequency of the slot antenna loaded by the coplanar waveguide feeding capacitance is mainly determined by the resonant frequency of the radiation slot 3, but the size of the metal ground 2 and the position where the coplanar waveguide feeder conductor 9 is connected to the radiation slot 3 can also affect the antenna. Adjust the working frequency and matching degree.

In terms of technology, the coplanar waveguide fed capacitively loaded slot antenna can be realized by either ordinary printed circuit board (PCB) technology, low temperature co-fired ceramic (LTCC) technology or integrated circuit technology such as CMOS and Si substrates. . Capacitor 7 can select the chip capacitor 7 of corresponding package according to the working frequency, and select the width of the radiation slot 3 according to the distance between the electrodes of the two pins of the capacitor 7 .

According to the above, the present invention can be realized.

Claims (2)

1. the slot antenna of a coplanar wave guide feedback capacitive load, it is characterised in that this antenna include medium substrate (1), Metal ground (2) being arranged on medium substrate (1) and the radiation line of rabbet joint (3), coplanar waveguide feeder line (4)；Medium substrate (1) one side is metal ground (2) and coplanar waveguide feeder line (4), and the ground plane (5) of coplanar waveguide feeder line (4) is just It is metal ground (2)；Having the radiation line of rabbet joint (3) on metal ground (2), the shape of the radiation line of rabbet joint (3) is rectangle, radius The center of seam (3) with being positioned at metal (2)；Two ends (6) short circuit of the radiation line of rabbet joint (3)；There is several electric capacity (7) It is connected in parallel across radiating two edges of the line of rabbet joint (3) so that the characteristic impedance step-down of the radiation line of rabbet joint (3)；Co-planar waveguide One end of feeder line (4) is the port (8) of antenna, and the conductor (9) of coplanar waveguide feeder line (4) other end strides across radiation The line of rabbet joint (3), radiation the line of rabbet joint (3) edge (10), with metal (2) be connected.

The slot antenna of a kind of coplanar wave guide feedback capacitive load the most according to claim 1, it is characterised in that change Become quantity, capacitance and the spacing of loading capacitance (7), the characteristic impedance of the radiation line of rabbet joint (3) can be regulated, thus it is possible to vary The operating frequency of antenna, the width of working band and the electrical length of the radiation line of rabbet joint (3).