CN104134871B - High isolation half line of rabbet joint gap aerial array - Google Patents

Abstract

The high-isolation half-slot slot antenna array relates to a multiple-input multiple-output antenna. The antenna is composed of three half-slot slot antennas that are placed together in pairs with orthogonal radiation polarization directions. Each half-slot slot antenna is composed of a microstrip feeder and a metal ground plane on a dielectric substrate; there is a metal ground plane on the metal ground plane. The radiation half slot and multiple isolation slots; the shape of the radiation half slot is rectangular, one end is a short circuit, and the other end is an open circuit; the isolation slots around the radiation half slot are parallel to each other; the long side direction of the radiation half slot is in line with The long sides of the isolation slots are perpendicular to each other; the resonance frequency of the isolation slots is lower than the operating frequency of the antenna; one end of the microstrip feeder is the input and output port of the antenna, and the other end of the microstrip feeder has a metal shorting pin at the end of the conduction band of the microstrip feeder , the metal shorting pin connects the conduction band to the metal ground plane at the edge of the radiating half slot. The antenna can effectively reduce the adverse effects of shielding and isolation of the normal radiation of the antenna by the metal ground plane.

Description

High Isolation Half Slot Slot Antenna Array

technical field

The invention relates to a microwave antenna, in particular to a high-isolation half-slot slot antenna array.

Background technique

Multiple-input multiple-output (MIMO) technology is an effective technology for improving information transmission capacity. Multi-polarization MIMO is a commonly used technology. The antenna array of a multi-polarization MIMO system has two or more unit antennas to form an antenna These element antennas have mutually orthogonal radiation polarization directions. In order to ensure better channel isolation, it is required that these element antennas with different polarization directions have better isolation. Common slot antennas can be used to form antenna arrays for multi-polarization MIMO, but the isolation of these antenna arrays is not very high.

Since the metal ground plane of the slot antenna can induce currents in multiple directions, the radiation of these currents will cause a decrease in the isolation between the antennas. When antennas with different polarization directions are co-located at one place, due to the The closer the distance, the stronger the mutual induction current, making the problem of antenna isolation more serious; in addition, when antennas with different radiation polarization directions are co-located, the shielding of the metal ground plane of one antenna to the radiation field of the other antenna will The directivity of another antenna is affected, especially the radiation characteristics of the blocked direction will be deteriorated.

Contents of the invention

Technical problem: The purpose of this invention is to propose a co-located high-isolation half-slot slot antenna array, which can effectively reduce the influence of induced current on the metal surface and improve the isolation between unit antennas in different radiation polarization directions; The effect of mutual occlusion between element antennas.

Technical solution: The high-isolation half-slot slot antenna array of the present invention is composed of three half-slot slot antennas that are placed together and whose radiation polarization directions are orthogonal to each other; each half-slot slot antenna includes a microstrip on a dielectric substrate Feed line and metal ground plane; on the metal ground plane, there is a radiating half-slot and multiple isolation slits perpendicular to it; the shape of the radiating half-slot is rectangular, and one end of the radiating half-slot is a short circuit and the other end is an open circuit; The isolation slot is around the radiation half slot, and its shape is a narrow rectangle; the isolation slots are parallel to each other, and one end of the isolation slot is either short-circuited, or extends to the edge of the metal ground plane, making the isolation slot open at this end; the isolation slot The other end is either shorted or open.

The length of the radiating half-slot is approximately half the antenna's operating wavelength.

The length of the isolation slot is such that its resonant frequency is lower than the operating frequency of the antenna.

The ground plane of the microstrip feeder is the metal ground plane, and the conduction band of the microstrip feeder is on the other side of the dielectric substrate; the outer end of the microstrip feeder is the input and output port of the antenna, and at the inner end of the microstrip feeder, the conductor of the microstrip feeder The strip spans the radial half slot, and the end of the conduction strip has a metal shorting pin; the entry point of the metal shorting pin on the long edge of the radial half slot connects the conduction strip to the metal ground plane; the entry point is at the radial half slot The position of the edge of the long side of the slit should make the standing wave of the antenna as small as possible.

In order to further reduce the input standing wave of the antenna, the distance between the access point and the long edge of the radiating half slot can also be adjusted.

Beneficial effect: the beneficial effect of the present invention is that the proposed high-isolation half-slot slot antenna array can not only effectively reduce the adverse effect of induced current on the metal ground plane on antenna radiation and isolation, but also make the difference between different half-slot slot antennas in the antenna array The isolation between different half-slot slot antennas in the antenna array is small, and the mutual shielding effect between different half-slot slot antennas is small, and the three half-slot slot antennas are co-located, so that the volume of the entire antenna array is small and the area of the metal surface of the half-slot slot antenna is also small. be reduced.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the high-isolation half-slot antenna array of the present invention, and Fig. 2 is a schematic diagram of the structure of the half-slot antenna.

In the figure, there are: half-slot antenna 1, dielectric substrate 2, microstrip feeder 3, metal ground plane 4, radiation half-slot 5, isolation gap 6, conduction band 7, input and output ports 8, metal short-circuit pin 9, access Point 10.

detailed description

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

The technical solution adopted in the present invention is: the high-isolation half-slot slot antenna array is composed of three half-slot slot antennas 1 that are placed together and whose radiation polarization directions are orthogonal to each other; each half-slot slot antenna 1 includes a The microstrip feeder 3 and the metal ground plane 4 on the substrate 2; on the metal ground plane 4 there is a radiating half slot 5 and a plurality of isolation slits 6 perpendicular to it; the radiating half slot 5 is rectangular in shape, and the radiating half One end of the slot 5 is a short circuit, and the other end is an open circuit; the isolation slit 6 is around the radiation half slot 5, and its shape is a narrow rectangle; the isolation slits 6 are all parallel to each other, and one end of the isolation slit 6 is either short circuited or stretched. to the edge of the metal ground plane 4, so that the isolation slot 6 is open at this end; the other end of the isolation slot is either a short circuit or an open circuit.

The length of the radiating half-slot 5 is approximately half the antenna's operating wavelength.

The length of the isolation slot is such that its resonant frequency is lower than the operating frequency of the antenna.

The ground plane of the microstrip feeder 3 is the metal ground plane 4, and the conduction band 7 of the microstrip feeder 3 is on the other side of the dielectric substrate 2; outside the microstrip feeder 3 is the input and output port 8 of the antenna, at the inner end of the microstrip feeder , the conduction band 7 of the microstrip feeder 3 spans the radial half slot 5, and there is a metal short-circuit pin 9 at the end of the conduction band 7; Connect with the metal ground plane 4; the position of the access point 10 on the edge of the radiating half-slot 5 along the long side of the radiating half-slot 5 should make the standing wave of the antenna as small as possible.

In order to further reduce the input standing wave of the antenna, the distance from the access point 10 to the long edge of the radiating half slot 5 can also be adjusted.

Structurally, the high-isolation half-slot antenna array is composed of three unit half-slot antennas 1 whose radiation polarization directions are orthogonal to each other; the width of the radiation half-slot 5 is much smaller than the length of the radiation half-slot 5; The width of the radiation half-slot 5 on the half-slot slot antenna 1 is either the same or different; the length of the radiation half-slot 5 on different half-slot slot antennas 1 is either the same or different; the radiation half-slot of the half-slot slot antenna 1 The shape of the slot 5 is not only a rectangle, but also two rectangles with unequal widths connected together, that is, the radiation half slot 5 is a step impedance slot, so that the radiation half slot 5 can be reduced. The total length increases the working bandwidth of the antenna; the widths of different isolation slots 6 are either the same or different, the lengths of different isolation slots 6 are either the same or different, and the spacing between adjacent isolation slots 6 is either the same or different; the isolation slots 6 are distributed around the radiation half slot 5, and the isolation slot 6 also affects the operating frequency of the antenna. The closer the isolation slot 6 is to the radiation half slot 5, the greater the impact on the antenna operating frequency.

In manufacturing, the three unit half-slot slot antennas 1 of the high-isolation half-slot slot antenna array are fabricated on three dielectric substrates 2 respectively, and the thicknesses of the three dielectric substrates 2 are either the same or different. The directions are perpendicular to each other, and the three dielectric substrates intersect at a right angle; dielectric materials can be used to fix the structure of the antenna; the input and output ports of the antenna are in the direction away from the intersection of the three dielectric substrates at right angles to facilitate power feeding.

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

Claims (3)

1. high isolation half line of rabbet joint gap aerial array, is characterized in that this aerial array is by putting together and three and half groove slot antennas (1) of the mutual pairwise orthogonal in radiation polarization direction form; Each half groove slot antenna (1) includes the microstrip feed line (3) and the metal ground plane (4) that are positioned on medium substrate (2); Metal ground plane (4) has a radiation half line of rabbet joint (5) and perpendicular a plurality of isolation gap (6); Radiating half line of rabbet joint (5) shape is rectangle, and the one end radiating half line of rabbet joint (5) is short circuit, and the other end is open circuit; Isolation gap (6) is around radiation half line of rabbet joint (5), and its shape is narrow rectangle; Isolation gap (6) is all parallel to each other, and isolates one end or the short circuit in gap (6), or is stretched over the edge of metal ground plane (4), isolation gap (6) is opened a way in this one end; The other end in isolation gap or short-circuit or open circuit;

Wherein:

The ground plane of described microstrip feed line (3) is exactly metal ground plane (4), the conduction band (7) of microstrip feed line (3) another side in medium substrate (2); The outer end of microstrip feed line (3) is the input/output port (8) of antenna, the inner at microstrip feed line, the conduction band (7) of microstrip feed line (3) crosses over radiation half line of rabbet joint (5), and the end of conduction band (7) has a short circuit metal pin (9); Short circuit metal pin access point (10) in the long side edge of radiation half line of rabbet joint (5) is connected conduction band (7) with metal ground plane (4);Access point (10) to make the standing wave of antenna as far as possible little in the position of radiation half line of rabbet joint (5) long side edge.

2. a kind of high isolation half line of rabbet joint gap aerial array according to claim 1, is characterized in that the length of radiation half line of rabbet joint (5) is approximately 1/4th of antenna operating wavelength.

3. a kind of high isolation half line of rabbet joint gap aerial array according to claim 1, is characterized in that the length in isolation gap to make its resonant frequency operating frequency lower than antenna.