Single-layer dual-frequency ceramic antenna

Abstract

The utility model relates to the technical field of ceramic antennas, in particular to a single-layer double-frequency ceramic antenna, which comprises a ceramic medium, an antenna feed pin connected to the top of the ceramic medium, an antenna high-frequency radiator connected to the top of the ceramic medium, a gap connected to the ceramic medium, an antenna coupling branch connected to the ceramic medium, and a single-layer double-frequency ceramic antenna connected to the antenna coupling branch. One side of the ceramic medium is connected with a connecting conductor, and the bottom of the ceramic medium is connected with a ceramic reflection ground. According to the single-layer dual-frequency ceramic antenna, the single-layer ceramic is adopted, dual-frequency is achieved through side coupling, the size of the antenna is reduced by half on the original basis, the performance is not changed, dual-frequency can be achieved on the basis of the size of an original product, and the performance is the same as that of laminated ceramic.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic antennas, in particular to a single-layer dual-frequency ceramic antenna. Background Art

[0002] Ceramic antennas have been widely used in navigation equipment to receive satellite navigation signals from GPS, GLONASS, Beidou satellite navigation systems, etc. The current stacked dual-frequency GNSS ceramic antenna has a stacked upper antenna and a lower antenna, and the feed copper needle vertically penetrates the upper antenna and the lower antenna. In addition, in order to fix the stacked upper antenna and the lower antenna, double-sided tape is generally used for reinforcement.

[0003] After searching, a Chinese patent with patent publication number CN209434365U discloses a single-feed dual-frequency GNSS ceramic antenna, which includes a first antenna layer, a second antenna layer, a positioning structure and a feeding pin, the second antenna layer is arranged on the first antenna layer, the positioning structure is arranged between the first antenna layer and the second antenna layer, the feeding pin passes through the first antenna layer and the second antenna layer, and is located on one side of the positioning structure, wherein the positioning structure can ensure that the first antenna layer and the second antenna layer cannot rotate relative to each other around the feeding pin on one side of the feeding pin, and thus the single-feed dual-frequency GNSS ceramic antenna of the utility model will not produce frequency deviation and impedance change problems, which can effectively improve the quality and service life of the single-feed dual-frequency GNSS ceramic antenna of the utility model.

[0004] The above patent has the following shortcomings: the single-feed dual-frequency GNSS ceramic antenna uses the high-frequency part for positioning. To use dual-frequency for positioning, the size of the ceramic needs to be increased, either the height or the length needs to be doubled. In this way, the existing product shell cannot be placed in the dual-frequency ceramic, and the shell usually needs to be redesigned to place the ceramic. In view of this, we propose a single-layer dual-frequency ceramic antenna. Utility Model Content

[0005] The purpose of the utility model is to provide a single-layer dual-frequency ceramic antenna to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A single-layer dual-band ceramic antenna comprises: a ceramic medium, wherein the size of the ceramic medium is 35*35mm, the thickness is 2-6mm, the dielectric constant of the ceramic medium is 13-16, and an antenna feed pin is connected to the top of the ceramic medium, and the impedance is adjusted by the distance between the antenna feed pin and the center position of the ceramic body, and the distance from the center of the ceramic is 3-5mm.

[0008] Preferably, the top of the ceramic medium is connected to an antenna high-frequency radiator, and the antenna high-frequency radiator is rectangular in shape.

[0009] The length and width of the rectangle are between 25 and 28 mm, and four protruding branches are added to the rectangle. The branches are used to correct the antenna frequency during mass production.

[0010] Preferably, a gap is connected to the ceramic medium.

[0011] The gap is the gap between the main radiator of the antenna and the coupling branch. The gap is used to control the coupling degree of high frequency and low frequency, thereby further controlling the antenna standing wave. The distance of the gap is adjusted according to the thickness of the base ceramic substrate. The thicker the ceramic thickness, the larger the gap distance. The distance of the gap is 1-2.5mm.

[0012] Preferably, an antenna coupling branch is connected to the ceramic medium.

[0013] The length of the coupling branch on the front side of the ceramic can adjust the high and low frequencies at the same time. The length of the coupling branch varies according to the dielectric constant of the ceramic and is 22-28 mm.

[0014] Preferably, one side of the ceramic medium is connected to a connecting conductor.

[0015] The coupling branch is connected to the metal on the back of the ceramic by a 1.8 mm conductive silver surface on the side.

[0016] Preferably, the bottom of the ceramic medium is connected to a ceramic reflective ground.

[0017] The back of the ceramic is covered with silver except for a 1.5mm circular gap for the feed pin.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. This single-layer dual-band ceramic antenna uses a single-layer ceramic and realizes dual-band through side coupling. The volume of the antenna is reduced by half on the original basis, and the performance remains unchanged.

[0020] 2. This single-layer dual-band ceramic antenna can achieve dual-band in the original product size, and its performance is the same as that of laminated ceramics. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the utility model;

[0022] Figure 2 It is a side view of the utility model;

[0023] Figure 3 It is a back view of the utility model.

[0024] In the figure: 1. Ceramic dielectric; 2. Antenna feed pin; 3. Antenna high-frequency radiator; 4. Gap; 5. Antenna coupling branch; 6. Connecting conductor; 7. Ceramic reflection ground. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Ceramic antennas have been widely used in navigation equipment to receive satellite navigation signals from GPS, GLONASS, Beidou satellite navigation systems, etc. The current stacked dual-frequency GNSS ceramic antenna has a stacked upper antenna and a lower antenna, and the feed copper needle vertically penetrates the upper antenna and the lower antenna. In addition, in order to fix the stacked upper antenna and the lower antenna, double-sided tape is generally used for reinforcement.

[0027] Generally, ceramic antennas use the high-frequency part for positioning. To use dual-frequency for positioning, the size of the ceramic needs to be increased, either the height or the length needs to be doubled. In this way, the dual-frequency ceramic cannot be placed in the existing product shell, and it is usually necessary to redesign the shell to place the ceramic.

[0028] like Figure 1-3 As shown, a single-layer dual-band ceramic antenna includes: a ceramic medium 1, the size of the ceramic medium 1 is 35*35mm, the thickness is 2-6mm, the dielectric constant of the ceramic medium 1 is 13-16, and the top of the ceramic medium 1 is connected to an antenna feed pin 2. The antenna feed pin 2 is adjusted by the distance from the center position of the ceramic body, and the distance from the center of the ceramic is 3-5mm.

[0029] like Figure 1 As shown, the top of the ceramic medium 1 is connected to an antenna high-frequency radiator 3 , and the shape of the antenna high-frequency radiator 3 is rectangular.

[0030] Specifically, the length and width of the rectangle are between 25 and 28 mm, and four protruding branches are added to the rectangle, which are used to correct the antenna frequency during mass production.

[0031] like Figure 1 As shown, a gap 4 is connected to the ceramic medium 1 .

[0032] Specifically, gap 4 is the gap 4 between the main radiator and the coupling branch of the antenna. The coupling degree of high frequency and low frequency is controlled through gap 4, so as to further control the standing wave of the antenna. The distance of gap 4 is adjusted according to the thickness of the base ceramic substrate. The thicker the ceramic thickness, the larger the distance of gap 4. The distance of gap 4 is 1-2.5mm.

[0033] like Figure 1 As shown, the ceramic medium 1 is connected to an antenna coupling branch 5 .

[0034] Specifically, the length of the coupling branch on the front side of the ceramic can adjust the high frequency and the low frequency at the same time. The length of the coupling branch varies according to the dielectric constant of the ceramic, and the length is 22-28 mm.

[0035] like Figure 2 As shown, a connecting conductor 6 is connected to one side of the ceramic dielectric 1 .

[0036] Specifically, the coupling branch is connected on the side of the ceramic front side with the metal on the ceramic back side through a 1.8 mm conductive silver surface.

[0037] like Figure 3 As shown, a ceramic reflective ground 7 is connected to the bottom of the ceramic medium 1 .

[0038] Specifically, the back of the ceramic is completely covered with silver except for a 1.5 mm circular gap left for the feeding needle.

[0039] The working principle of the utility model is as follows: the antenna adopts a dual-feed mode, and then adds a 3dB 90° bridge to synthesize a circularly polarized antenna. The square in the middle part is the high-frequency radiation surface of the antenna, and the four rectangular silver surfaces on the side are the antenna coupling branches 5, which couple with the high-frequency radiation surface to produce dual frequencies. The standing waves and frequencies are debugged by adjusting the spacing with the high-frequency radiation surface. The four rectangular silver surfaces on the side are coupling branches and grounding branches. Through these branches, the antenna coupling branches 5 are connected to the ground on the back of the ceramic. Under normal conditions, the length of the antenna coupling branches 5 is half the wavelength of the low-frequency wavelength. Through the grounding branches, the length of the coupling branches is shortened to about one-fifth of the original length.

[0040] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A single-layer dual-band ceramic antenna, characterized in that: include: A ceramic medium (1), the size of the ceramic medium (1) is 35*35 mm, the thickness is 2-6 mm, the dielectric constant of the ceramic medium (1) is 13-16, and the top of the ceramic medium (1) is connected to an antenna feed pin (2).

2. The single-layer dual-frequency ceramic antenna according to claim 1, characterized in that: The top of the ceramic medium (1) is connected to an antenna high-frequency radiator (3), and the shape of the antenna high-frequency radiator (3) is rectangular.

3. The single-layer dual-frequency ceramic antenna according to claim 1, characterized in that: The ceramic medium (1) is connected with a gap (4).

4. The single-layer dual-frequency ceramic antenna according to claim 1, characterized in that: The ceramic medium (1) is connected to an antenna coupling branch (5).

5. The single-layer dual-frequency ceramic antenna according to claim 1, characterized in that: A connecting conductor (6) is connected to one side of the ceramic medium (1).

6. The single-layer dual-frequency ceramic antenna according to claim 1, characterized in that: The bottom of the ceramic medium (1) is connected to a ceramic reflective ground (7).

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