CN209913032U - Coplanar waveguide feed high-gain gap-shaped log-periodic array antenna - Google Patents

Abstract

The utility model discloses a coplanar waveguide feed high gain gap shaped log periodic array antenna, which comprises a dielectric substrate and a metal layer; the utility model discloses a with the metal level laminating on the medium base plate, the symmetry sculpture has the line of juncture that is arborescent fretwork on the metal level, regards the trunk line of juncture as the transmission gap, and the branch line of juncture as the dipole gap, through figuring the periodic array slot antenna of logarithm for the antenna is in impedance bandwidth within range, compares the gain with traditional logarithmic periodic array slot antenna and is showing and improve. The utility model relates to a classic plane antenna, which has the advantages of simple structure, convenient manufacture, low price, simple erection, no need of inputting a matching circuit, high gain, wide frequency band and low weight; the coplanar waveguide feed has the advantages of small radiation loss, excellent dispersion characteristic and convenient realization of impedance matching.

Description

Coplanar waveguide feed high-gain gap-shaped log-periodic array antenna

Technical Field

The utility model belongs to the technical field of microwave, radio communication and test simulation technique and specifically relates to a high gain gap shaping log periodic array antenna of coplane waveguide feed.

Background

The log periodic slot antenna in the prior art belongs to a medium-gain broadband antenna, has a relatively stable radiation characteristic, and is widely applied to a wireless communication system. The important characteristics of the log-periodic slot antenna, including the directional pattern, polarization, impedance, etc., remain unchanged or slightly change in a specific wide frequency range. The conventional log periodic array slot antenna has a large gain and a large size, so that the improvement of the gain of the antenna and the reduction of the external dimension are restricted. In addition, the shaped antenna was originally proposed to be applied to the gain improvement of the yagi antenna, and there are problems that the higher gain is realized, the traditional yagi antenna is improved at the cost of larger size and more directors, and the gain improvement after the shaping is not obvious.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the not enough high gain gap shaping log periodic array antenna who provides to prior art, the utility model discloses a laminate the metal level on the medium base plate, the symmetry sculpture has the slot that is arborescent fretwork on the metal level, regards the trunk slot as the transmission gap, and the branch slot is as the dipole gap, through shaping log periodic array slot antenna for the antenna is in impedance bandwidth within range, compares the gain with traditional log periodic array slot antenna and is showing and improve. The utility model relates to a classic plane antenna, which has the advantages of simple structure, convenient manufacture, low price, simple erection, no need of inputting a matching circuit, high gain, wide frequency band and low weight; the coplanar waveguide feed has the advantages of small radiation loss, excellent dispersion characteristic and convenient realization of impedance matching.

Realize the utility model discloses the concrete technical scheme of purpose is:

a high gain gap shaped log periodic array antenna with coplanar waveguide feed is characterized in that the antenna comprises a dielectric substrate and a metal layer;

the medium substrate is a rectangular plate provided with a vertical central line;

the metal layer is a rectangular plate provided with a vertical central line;

the metal layer is attached to the dielectric substrate, the vertical middle lines of the metal layer and the dielectric substrate are overlapped, and the bottom edges of the metal layer and the dielectric substrate are aligned;

the metal layer is symmetrically etched with hollowed slots which are tree-shaped, each slot is composed of a trunk slot parallel to the central line and a plurality of curved branch slots, the trunk slot is divided into three sections, and each trunk slot is composed of a second transmission slot with equal width, a connecting slot with a narrowing section and a first transmission slot with a slot section;

the four branch slots are divided into a first dipole slot, a second dipole slot, a third dipole slot and a fourth dipole slot according to the shape ratio from large to small, and the first dipole slot, the second dipole slot, the third dipole slot and the fourth dipole slot are arranged from bottom to top and are respectively connected with second transmission slots with equal width sections of the trunk slots;

the branch slot and the trunk slot are symmetrically arranged relative to the vertical centerline of the metal layer, and a gap is reserved between the two symmetrically arranged trunk slots;

the width of a second transmission gap of the equal-width section of the trunk slot is the same as that of the first dipole gap; the graphs of the second dipole gap, the third dipole gap and the fourth dipole gap are sequentially reduced in a descending manner, and the descending extent is 5%.

The 'S' shape of the branch slot joint is formed by two sections of quarter circular arc sections which are arranged in a reverse direction, a section of vertical line section connected in the middle and a section of horizontal line section connected at the tail end, and the head end of the quarter circular arc of the branch slot joint is connected with the trunk slot joint.

The metal layer is made of copper.

The utility model discloses a with the metal level laminating on the medium base plate, the symmetry sculpture has the line of juncture that is arborescent fretwork on the metal level, regards the trunk line of juncture as the transmission gap, and the branch line of juncture as the dipole gap, through figuring the periodic array slot antenna of logarithm for the antenna is in impedance bandwidth within range, compares the gain with traditional logarithmic periodic array slot antenna and is showing and improve. The utility model relates to a classic plane antenna, which has the advantages of simple structure, convenient manufacture, low price, simple erection, no need of inputting a matching circuit, high gain, wide frequency band and low weight; the coplanar waveguide feed has the advantages of small radiation loss, excellent dispersion characteristic and convenient realization of impedance matching.

The beneficial effects of the utility model are that, through the method of shaping, improved the gain of log periodic array slot antenna effectively, have simple structure, the characteristics of being convenient for make, different with traditional printed antenna, adopt slot antenna to have certain novelty, do not bring any processing burden except the design part, be favorable to the application of this antenna in radio communication.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is an enlarged schematic view of area A of FIG. 1;

fig. 4 is a schematic diagram of a simulation result of the present invention;

FIG. 5 is a radiation pattern of the present invention at the Y-O-Z resonance point;

FIG. 6 is a radiation pattern of the present invention at the X-O-Y resonance point;

fig. 7 is a graph showing the gain effect of the present invention.

Detailed Description

Referring to fig. 1 and 2, the present invention includes a dielectric substrate 1 and a metal layer 2;

referring to fig. 1 and 2, the dielectric substrate 1 is a rectangular plate with a vertical center line; the metal layer 2 is a rectangular plate provided with a vertical central line; the metal layer 2 is attached to the dielectric substrate 1, the vertical middle lines of the metal layer and the dielectric substrate are overlapped, and the bottom edges of the metal layer and the dielectric substrate are aligned.

Referring to fig. 1 and 3, the metal layer 2 is symmetrically etched with a hollowed-out slot, the slot is tree-shaped, the slot is composed of a trunk slot parallel to the center line and a plurality of curved branch slots, the trunk slot is divided into three sections, and the trunk slot is composed of a second transmission slot 5 with equal width, a connection slot 4 with a narrow section and a first transmission slot 3 with a slot section.

Referring to fig. 1 and 3, the branch slots are four and in an S shape, the four branch slots are divided into a first dipole slot 6, a second dipole slot 7, a third dipole slot 8 and a fourth dipole slot 9 according to the shape ratio from large to small, and the first dipole slot 6, the second dipole slot 7, the third dipole slot 8 and the fourth dipole slot 9 are arranged from bottom to top and are respectively connected with the second transmission slots 5 of the trunk slots with the same width.

Referring to fig. 1, the branch slot and the trunk slot are symmetrically arranged with respect to the vertical centerline of the metal layer 2, and a gap is left between the two symmetrically arranged trunk slots;

referring to fig. 1, the width of the second transmission slot 5 of the equal width section of the trunk slot is the same as that of the first dipole slot 6; the graphs of the second dipole gap 7, the third dipole gap 8 and the fourth dipole gap 9 are sequentially reduced in a descending manner, and the descending extent is 5%.

Referring to fig. 1, the S-shape of the branch slot is formed by two sections of quarter circular arc sections which are arranged in opposite directions, a section of vertical line section connected in the middle, and a section of horizontal line section connected at the tail end, and the head end of the quarter circular arc of the branch slot is connected with the trunk slot.

The metal layer 2 is made of copper.

Referring to fig. 4, it can be seen from the simulation result that the resonant frequency of the present invention is 3.31GHz, the return loss at the point is-27 dB, and the impedance bandwidth below-10 dB is 3.0GHz to 4.4 GHz.

The utility model discloses a dipole gap symmetry is arranged, and the feed mode is coplanar waveguide feed, and the wideer bandwidth can be realized to this kind of feed structure, and the maximum gain value in the working frequency range is 6.13dBi, has better radiation characteristic.

The dipole gap of the utility model can effectively improve the antenna gain through the shaping; refer to yagi antenna' S design thought, improve antenna gain through dipole array, the utility model discloses an improvement lies in making the dipole seam arborescent, makes things convenient for the etching process of seam, and the antenna preparation of being convenient for designs the dipole seam into "S" shape, comprises one section vertical line section of quarter circular arc section, the intermediate junction of two sections reverse settings, a section horizontal line section of trailing end connection, through the bend figuration, saves certain space when guaranteeing to improve the gain performance.

The utility model has the advantages of feed structure is simple, low section, broadband, high gain, consequently has higher using value in wireless communication system.

Referring to fig. 5, when the present invention is placed in the coordinate system, the radiation pattern of the present invention at the Y-O-Z resonance point of 3.31 GHz.

Referring to fig. 6, when the present invention is placed in the coordinate system, the radiation pattern of the present invention at the X-O-Y resonance point of 3.31 GHz.

Referring to fig. 7, it can be seen from fig. 7 that the gain of the present invention is as high as 6.1dB at the operating frequency of 3.4 GHZ.

Claims (2)

1. A high-gain gap-shaped log-periodic array antenna fed by coplanar waveguide is characterized by comprising a dielectric substrate (1) and a metal layer (2);

the medium substrate (1) is a rectangular plate provided with a vertical central line;

the metal layer (2) is a rectangular plate provided with a vertical central line;

the metal layer (2) is attached to the dielectric substrate (1), the vertical middle lines of the metal layer and the dielectric substrate are overlapped, and the bottom edges of the metal layer and the dielectric substrate are aligned;

the metal layer (2) is symmetrically etched with hollowed slots which are tree-shaped, each slot is composed of a trunk slot parallel to the central line and a plurality of curved branch slots, and the trunk slot is divided into three sections which are a second transmission slot (5) with equal width, a connection slot (4) with a narrowing section and a first transmission slot (3) with a slot section;

the four branch slots are S-shaped and are divided into a first dipole slot (6), a second dipole slot (7), a third dipole slot (8) and a fourth dipole slot (9) according to the shape ratio from large to small, and the first dipole slot (6), the second dipole slot (7), the third dipole slot (8) and the fourth dipole slot (9) are arranged from bottom to top and are respectively connected with second transmission slots (5) with equal width sections of the trunk slots;

the branch slot and the trunk slot are symmetrically arranged relative to the vertical centerline of the metal layer (2), and a gap is reserved between the two symmetrically arranged trunk slots;

the width of a second transmission gap (5) of the equal-width section of the trunk slot is the same as that of the first dipole gap (6); the graphs of the second dipole gap (7), the third dipole gap (8) and the fourth dipole gap (9) are sequentially reduced in a descending manner, and the descending extent is 5%;

the 'S' shape of the branch slot joint is formed by two sections of quarter circular arc sections which are arranged in a reverse direction, a section of vertical line section connected in the middle and a section of horizontal line section connected at the tail end, and the head end of the quarter circular arc of the branch slot joint is connected with the trunk slot joint.

2. The coplanar waveguide fed high gain slot-shaped log periodic array antenna as claimed in claim 1, wherein the metal layer (2) is made of copper.

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