CN103618136A - Ring-encircled wideband coplanar antenna - Google Patents

Abstract

The invention discloses a ring-encircled wideband coplanar antenna. The ring-encircled wideband coplanar antenna includes a substrate, a square-shaped frame radiating patch, an impedance matching input transmission line, a left rectangular metal grounding plate, a right rectangular metal grounding plate and an opening metal ring; the square-shaped frame radiating patch, the impedance matching input transmission line, the left rectangular metal grounding plate, the right rectangular metal grounding plate and the opening metal ring are arranged on the substrate; the opening metal ring is provided with a downward opening; the square-shaped frame radiating patch is located inside the opening metal ring; the left end of the opening metal ring is connected with the upper right end of the left rectangular metal grounding plate; the right end of the opening metal ring is connected with the upper left end of the right rectangular metal grounding plate; the lower end of the impedance matching input transmission line, the lower end of the left rectangular metal grounding plate and the lower end of the right rectangular metal grounding plate are connected with the bottom end of the substrate. The ring-encircled wideband coplanar antenna of the invention is advantageous in stable radiation characteristic, low loss, wide frequency band, small and simple structure, low cost, and convenient integration.

Description

Broadband Coplanar Antenna Surrounded by Torus

technical field

The invention relates to antennas, in particular to a circular-enclosed broadband coplanar antenna.

Background technique

The antenna is an integral part of all wireless communication systems, responsible for converting the signal from the transmitter into electromagnetic waves for propagation to space, or converting electromagnetic signals in free space into high-frequency signals for receivers to receive, thereby Realize the space signal exchange process of wireless communication. With the continuous development of wireless communication technology and the continuous improvement of hardware research and development conditions, in order to better realize the transmission of wireless signals, higher requirements are placed on the performance of antennas. In today's environment where wireless communication equipment is widely used , the importance of antennas is increasing day by day, and the research on various antenna technologies and the requirements for higher technical indicators make antenna technology usher in another major opportunity for development.

In order to meet the increasingly higher bandwidth requirements in current wireless communications, the design of improving the narrow-band characteristics of microstrip antennas has become one of the important research topics. Microstrip antennas have many advantages, such as small size, easy array arrangement, planar structure, easy integration, and easy conformity with the carrier. These advantages are exactly what broadband systems need. Therefore, how to develop a miniaturized, planar structure, low-cost, high-performance broadband microstrip antenna has become a key research direction for domestic and foreign researchers.

Contents of the invention

The present invention provides a ring-enclosed broadband coplanar antenna, and the technical scheme is as follows:

The ring-enclosed broadband coplanar antenna includes a substrate, a square-frame radiation patch, an impedance-matched input transmission line, a rectangular metal ground plate on the left, a rectangular metal ground plate on the right, and an open metal ring; the substrate is equipped with a square-frame radiation patch , Impedance matching input transmission line, rectangular metal ground plate on the left, rectangular metal ground plate on the right, open metal ring; the opening of the open metal ring is downward, the square frame radiation patch is located inside the open metal ring, and the left end of the open metal ring It is connected to the upper right end of the left rectangular metal grounding plate, and the right end of the open metal ring is connected to the upper left end of the right rectangular metal grounding plate; the upper end of the impedance matching input transmission line is connected to the lower end of the square frame radiation patch, and the lower end of the impedance matching input transmission line is The lower end of the metal grounding plate and the lower end of the right rectangular metal grounding plate are connected to the bottom of the substrate.

The substrate is made of glass fiber epoxy resin material, the length of the substrate is 40mm-42mm, and the width is 45mm-47mm. The outer side length of the square frame radiation patch is 11mm-12mm, and the inner side length is 7mm-8mm. The impedance matching input transmission line has a length of 13 mm to 14 mm and a width of 4 mm to 5 mm. The size parameters of the left rectangular metal grounding plate and the right rectangular metal grounding plate are the same, the length is 17mm-18mm, and the width is 11mm-12mm. The outer radius of the open metal ring is 14mm-15mm, and the central angle is 316°-318°; the inner radius is 12.5mm-13.5mm, and the central angle is 333°-335°.

The ring-enclosed broadband coplanar antenna of the present invention has stable radiation characteristics in the working frequency band, low loss, wide frequency band, simple and small structure, low cost and easy integration.

Description of drawings

Fig. 1 is a structural schematic diagram of a ring-enclosed broadband coplanar antenna;

Fig. 2 is the S-parameter curve diagram of the ring-enclosed broadband coplanar antenna;

Figure 3 is the E-plane radiation pattern of the antenna at 4.58GHz;

Figure 4 is the H-surface radiation pattern of the antenna at 4.58GHz;

Figure 5 is the E-plane radiation pattern of the antenna at 6.95GHz;

Figure 6 is the H-plane radiation pattern of the antenna at 6.95GHz.

Detailed ways

As shown in Figure 1, the ring-shaped broadband coplanar antenna includes a substrate 1, a square frame radiation patch 2, an impedance matching input transmission line 3, a rectangular metal ground plate 4 on the left, a rectangular metal ground plate 5 on the right, and an open metal circle. Ring 6; the substrate 1 is provided with a square frame radiation patch 2, an impedance matching input transmission line 3, a rectangular metal ground plate 4 on the left, a rectangular metal ground plate 5 on the right, and an open metal ring 6; the open metal ring 6 opens to Below, the square frame radiation patch 2 is located inside the open metal ring 6, the left end of the open metal ring 6 is connected to the upper right end of the left rectangular metal ground plate 4, and the right end of the open metal ring 6 is connected to the right rectangular metal ground plate 5 on the left The upper end of the impedance matching input transmission line 3 is connected to the lower end of the square frame radiation patch 2, the lower end of the impedance matching input transmission line 3, the lower end of the left rectangular metal ground plate 4, and the lower end of the right rectangular metal ground plate 5 are connected to the bottom end of the substrate 1.

The substrate 1 is made of glass fiber epoxy resin material, the length of the substrate 1 is 40mm-42mm, and the width is 45mm-47mm. The outer side length of the square frame radiation patch 2 is 11 mm to 12 mm, and the inner side length is 7 mm to 8 mm. The impedance matching input transmission line 3 has a length of 13mm-14mm and a width of 4mm-5mm. The size parameters of the left rectangular metal grounding plate 4 and the right rectangular metal grounding plate 5 are the same, the length is 17mm-18mm, and the width is 11mm-12mm. The outer radius of the open metal ring 6 is 14mm-15mm, and the central angle is 316°-318°; the inner radius is 12.5mm-13.5mm, and the central angle is 333°-335°.

Example 1

Toroidal Broadband Coplanar Antenna:

A glass fiber epoxy resin material with a dielectric constant of 4.4 is selected to make a microstrip substrate with a thickness of 1.5 mm. The substrate has a length of 40 mm and a width of 45 mm. The outer side length of the square frame radiation patch is 11mm, and the inner side length is 7mm. The impedance-matched input transmission line has a length of 13mm and a width of 4mm. The size parameters of the left rectangular metal ground plate and the right rectangular metal ground plate are the same, the length is 17 mm, and the width is 11 mm. The outer radius of the open metal ring is 14mm, and the central angle is 316°; the inner radius is 12.5mm, and the central angle is 333°. The various performance indicators of the ring-enclosed broadband coplanar antenna are tested with CST software, and the obtained S-parameter curve is shown in Figure 2. It can be seen from the figure that the working frequency band below -10dB is 4.28GHz to 9.0GHz. Figure 3-4 shows the E-plane and H-plane pattern of the antenna at 4.58GHz. It can be seen from the figure that when the frequency is 4.58GHz, the gain is 3.1dBi, and the half-power lobe width is 97.6°. Figure 5-6 shows the E-plane and H-plane pattern of the antenna at 6.95GHz. It can be seen from the figure that when the frequency is 6.95GHz, the gain is 2.5dBi, and the half-power lobe width is 59.7°.

Claims (6)

1. annulus surrounds the coplanar antenna of shape wideband, it is characterized in that comprising substrate (1), square box radiation patch (2), impedance matching input transmission line (3), left side rectangular metal ground plate (4), right side rectangular metal ground plate (5), open metal annulus (6); Substrate (1) is provided with square box radiation patch (2), impedance matching input transmission line (3), left side rectangular metal ground plate (4), right side rectangular metal ground plate (5), open metal annulus (6); Open Side Down for open metal annulus (6), square box radiation patch (2) is positioned at open metal annulus (6) inside, open metal annulus (6) left end is connected with left side rectangular metal ground plate (4) upper right side, and openings metal ring (6) right-hand member is connected with right side rectangular metal ground plate (5) left upper end; Impedance matching input transmission line (3) upper end is connected with square box radiation patch (2) lower end, and impedance matching input transmission line (3) lower end, left side rectangular metal ground plate (4) lower end, right side rectangular metal ground plate (5) lower end are connected with substrate (1) bottom.

2. a kind of annulus as claimed in claim 1 surrounds the coplanar antenna of shape wideband, it is characterized in that described substrate (1) is glass-epoxy material, and the length of substrate (1) is 40mm～42mm, and width is 45mm～47mm.

3. a kind of annulus as claimed in claim 1 surrounds the coplanar antenna of shape wideband, it is characterized in that the outer length of side of described square box radiation patch (2) is 11mm～12mm, and the interior length of side is 7mm～8mm.

4. a kind of annulus as claimed in claim 1 surrounds the coplanar antenna of shape wideband, it is characterized in that the length of described impedance matching input transmission line (3) is 13mm～14mm, and width is 4mm～5mm.

5. a kind of annulus as claimed in claim 1 surrounds the coplanar antenna of shape wideband, it is characterized in that described left side rectangular metal ground plate (4) is identical with the dimensional parameters of right side rectangular metal ground plate (5), length is 17mm～18mm, and width is 11mm～12mm.

6. a kind of annulus as claimed in claim 1 surrounds the coplanar antenna of shape wideband, it is characterized in that the exradius of described open metal annulus (6) is 14mm～15mm, and central angle is 316 °～318 °; Interior radius of circle is 12.5mm～13.5mm, and central angle is 333 °～335 °.

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