CN209747727U

CN209747727U - Double-loop double-frequency antenna

Info

Publication number: CN209747727U
Application number: CN201920533002.5U
Authority: CN
Inventors: 郁剑
Original assignee: Nanjing Tech University
Current assignee: Nanjing Tech University
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2019-12-06
Anticipated expiration: 2029-04-18

Abstract

The utility model discloses a double-ring double-frequency antenna, which comprises a dielectric substrate, a radiation unit, a microstrip feed unit and a grounding unit; the radiating unit is formed by splicing a large ring and a small ring which are arranged on the front surface of the dielectric plate, the microstrip feed unit is rectangular and arranged on the front surface of the dielectric substrate, and the bottom of the radiating unit is connected with the top of the microstrip feed unit; the grounding unit is rectangular and is arranged on the back surface of the dielectric substrate. The utility model has the advantages of dual-frequency band, good radiation characteristic, simple structure, small volume, easy processing and manufacturing, convenient batch production and the like.

Description

Double-loop double-frequency antenna

Technical Field

The utility model relates to an antenna field, in particular to dual-frenquency antenna, mainly used dual-frenquency wireless communication system.

Background

With the rapid development of wireless communication technology and the increase of market demand, modern wireless communication requires wireless access and high-capacity, high-rate data transmission anytime and anywhere. In order to adapt to the rapid development of Wireless communication technology, various communication protocols such as Wireless Local Area Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) have been introduced. The WLAN is widely used in various wireless communication systems, and is a computer local area network based on IEEE 802.11a standard (5.15 to 5.35GHz, 5.725 to 5.875GHz) and IEEE 802.11b/g standard (2.4 to 2.484GHz) and using wireless channels as transmission media, and realizes transmission of data, voice and video signals in the air. WiMAX is based on IEEE 802.16 standard (2-66 GHz), mainly works in 2.5GHz frequency band (2.50-2.69 GHz), 3.5GHz frequency band (3.40-3.69 GHz) and 5.5GHz frequency band (5.25-5.85 GHz), is a new air interface standard aiming at microwave and millimeter wave frequency bands, and can provide high-speed connection facing the Internet.

In recent years, the requirements of wireless communication systems for antennas are increasing, and microstrip antennas with the advantages of thin profile, small volume, small mass, easy integration and the like are widely researched and applied. Meanwhile, a modern wireless communication system often requires coexistence of multiple working frequency bands, and a wireless communication system working in dual-frequency or multi-frequency bands is an important direction of current development, so that research on dual-frequency microstrip antennas is also important. There are several methods for implementing dual frequency: (1) adding a parasitic patch; (2) loading the gap; (3) loading lumped elements, etc. The last method increases the reactive resistance of the circuit, and the additional parasitic patches and the loading of lumped elements complicate the structure of the circuit. The method for loading the slot does not change the physical structure of the original antenna, keeps the simplicity of the antenna structure and is widely applied.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a size is little, complanate, simple structure, with low costs, be applicable to dual-ring dual-frequency antenna of dual-frenquency wireless communication system.

The structure of the utility model is as follows:

a double-ring double-frequency antenna comprises a dielectric substrate, a radiation unit, a microstrip feed unit and a grounding unit; the radiation unit and the microstrip feed unit are positioned on the front surface of the dielectric substrate, and the bottom of the radiation unit is connected with the top of the microstrip feed unit, so that the radiation unit and the microstrip feed unit are combined into an integral conductive unit; the grounding unit is positioned at the lower part of the back surface of the dielectric substrate.

the radiation unit is a double ring which is formed by splicing a large ring and a small ring; the large ring is formed by cutting off the intersection part of a large circle I and a large circle II; the small ring is formed by cutting off the intersection part of the first small circle and the second small circle; the center of the first great circle is not coincident with the center of the second great circle; the circle center of the first small circle is not coincident with the circle center of the second small circle; the centers of the large circle I, the large circle II, the small circle I and the small circle II are on the same vertical line.

The microstrip feed unit is rectangular; the microstrip feed unit is superposed with the bottom edge of the dielectric substrate and is positioned in the middle of the bottom edge of the dielectric substrate.

The characteristic impedance of the microstrip feed element is 50 ohms.

The grounding unit is rectangular, and two side edges and a bottom edge of the grounding unit are respectively superposed with two side edges and a bottom edge of the dielectric substrate, namely the grounding unit is positioned on the whole lower surface of the dielectric substrate.

The upper edge of the grounding unit is away from the projection of the lower edge of the radiation unit on the upper surface of the dielectric substrate on the back surface of the dielectric substrate by a certain distance.

The beneficial effects of the utility model reside in that:

1. The antenna has a simple structure, and the size of the antenna is effectively reduced by adopting the monopole radiation unit.

2. The antenna adopts the monopole radiation unit to realize the dual-frequency characteristic of the antenna, and has the advantages of dual frequency bands, good radiation characteristic, simple structure, small volume, easy processing and manufacturing, convenient batch production and the like.

Drawings

Fig. 1 is a schematic top view of the dual-loop dual-band antenna of the present invention;

fig. 2 is a schematic side view of the dual-loop dual-band antenna of the present invention;

fig. 3 shows the simulated reflection coefficient S11 of the dual-loop dual-band antenna of the present invention;

Fig. 4 shows the radiation patterns of the dual-loop dual-band antenna of the present invention at 2.45GHz and 5.5 GHz.

Detailed Description

An embodiment of the present invention is further described below with reference to the accompanying drawings:

Given in fig. 1-2 is an embodiment of the present invention: a dual-loop dual-band antenna, comprising: the antenna comprises a dielectric substrate 1, a radiation unit 2 and a microstrip feed unit 3 which are covered on the front surface of the dielectric substrate 1 and are made of conductive dielectric copper, and a grounding unit 4 which is covered on the back surface of the dielectric substrate 1 and is made of conductive dielectric copper. The radiation unit 2 is a double ring which is formed by splicing a large ring 2-1 and a small ring 2-2; the large ring 2-1 is formed by cutting off the intersection part of a large circle I2-3 and a large circle II 2-4 from a large circle I2-3; the small ring 2-2 is formed by cutting off the intersection part of the small circle I2-5 and the small circle II 2-6 by the small circle I2-5; the circle center of the big circle I2-3 is not coincident with the circle center of the big circle II 2-4; the circle centers of the first small circle 2-5 and the second small circle 2-6 are not coincident; the centers of the large circle I2-3, the large circle II 2-4, the small circle I2-5 and the small circle II 2-6 are on the same vertical line. The microstrip feed unit 3 is rectangular; the microstrip feed unit 3 is superposed with the bottom edge of the dielectric substrate 1, and the microstrip feed unit 3 is positioned in the middle of the bottom edge of the dielectric substrate 1; the characteristic impedance of the microstrip feed element 3 is 50 ohms. The grounding unit 4 is rectangular, and two side edges and a bottom edge of the grounding unit 4 are respectively superposed with two side edges and a bottom edge of the dielectric substrate 1; the upper edge of the grounding unit 4 is at a distance from the projection of the lower edge of the radiating unit 2 on the upper surface of the dielectric substrate 1 on the back surface of the dielectric substrate 1.

the utility model discloses a dicyclo dual-frenquency antenna adopts is FR4 medium base plate that dielectric constant is 4.4, and medium base plate's length and width are 30mm and 24mm respectively, and thickness is 1.6 mm. The two rings of the radiating element are evolved by four circles, wherein the radii of the two large circles are 11mm and 10.3mm respectively, and the radii of the two small circles are 7.5mm and 6.5mm respectively; the distances from the centers of the two large circles to the edge of the bottom edge of the medium substrate are respectively 16.5mm and 16.2mm, and the distances from the centers of the two small circles to the edge of the bottom edge of the medium substrate are respectively 13mm and 12.8 mm. The microstrip feed unit is rectangular, and the length and the width of the microstrip feed unit are respectively 7.62mm and 3.2 mm; the ground element is also rectangular with a length and width of 7mm and 24mm respectively.

Referring to fig. 3, fig. 3 shows the reflection coefficient S11 of the dual-loop dual-band antenna. As can be seen from FIG. 2, the antenna has two working frequency ranges (S11 < -10dB), namely 2.387-2.498 GHz and 3.57-5.95 GHz, covering WLAN frequency bands (2.4-2.484 GHz, 5.15-5.35 GHz and 5.725-5.875 GHz) and WiMAX frequency bands (5.25-5.85 GHz).

Referring to fig. 4, the radiation patterns of the antenna at 2.45GHz and 5.5GHz are shown in fig. 4, and it can be seen that the radiation pattern of the antenna has omnidirectional radiation characteristics at both frequency points.

The utility model discloses a dicyclo dual-frenquency antenna can work at 2.387 ~ 2.498GHz and two working frequency channels of 3.57 ~ 5.95GHz, and this working frequency channel can cover WLAN frequency channel (2.4 ~ 2.484GHz, 5.15 ~ 5.35GHz, 5.725 ~ 5.875GHz) and WiMAX frequency channel (5.25 ~ 5.85GHz) to dicyclo dual-frenquency antenna all has omnidirectional radiation characteristic in its working frequency channel. And the simple structure of antenna, small, easily processing preparation, consequently the utility model discloses extensive application prospect has.

Claims

1. A dual-loop dual-band antenna, comprising: the antenna comprises a dielectric substrate (1), a radiation unit (2), a microstrip feed unit (3) and a grounding unit (4);

The radiation unit (2) and the microstrip feed unit (3) are positioned on the front surface of the dielectric substrate (1), and the bottom of the radiation unit (2) is connected with the top of the microstrip feed unit (3), so that the radiation unit (2) and the microstrip feed unit (3) are combined into an integral conductive unit; the grounding unit (4) is positioned at the lower part of the back surface of the dielectric substrate (1).

2. the dual loop dual band antenna of claim 1, wherein: the radiation unit (2) is formed by splicing a large ring (2-1) and a small ring (2-2); the large ring (2-1) is formed by cutting off a large circle I (2-3) from a large circle II (2-4); the small ring (2-2) is formed by cutting off a small circle I (2-5) and a small circle II (2-6); the circle center of the large circle I (2-3) is not coincident with the circle center of the large circle II (2-4); the circle centers of the first small circle (2-5) and the second small circle (2-6) are not overlapped; the centers of the large circle I (2-3), the large circle II (2-4), the small circle I (2-5) and the small circle II (2-6) are on the same vertical line.

3. the dual loop dual band antenna of claim 1, wherein: the microstrip feed unit (3) is rectangular; the microstrip feed unit (3) is superposed with the bottom edge of the dielectric substrate (1), and the microstrip feed unit (3) is positioned in the middle of the bottom edge of the dielectric substrate (1); the characteristic impedance of the microstrip feed unit (3) is 50 ohms.

4. The dual loop dual band antenna of claim 2, wherein: the grounding unit (4) is rectangular, and two side edges and a bottom edge of the grounding unit (4) are respectively overlapped with two side edges and a bottom edge of the dielectric substrate (1).

5. The dual loop dual band antenna of claim 1, wherein: the upper edge of the grounding unit (4) is away from the projection of the lower edge of the radiation unit (2) positioned on the front surface of the dielectric substrate (1) on the back surface of the dielectric substrate (1) by a certain distance.