Medical ultra-wideband two-unit MIMO (Multiple Input Multiple Output) notch antenna based on C-shaped groove

Abstract

The utility model relates to a medical ultra-wideband two-unit MIMO (Multiple Input Multiple Output) notch antenna, which structurally comprises a rectangular medium, two comma-shaped patches with the same structure, a rectangular feed unit, a rectangular metal ground and a C-shaped notch unit. A rectangular medium is filled between the comma-shaped patch and the rectangular metal ground; the rectangular feed unit is located on the front surface of the rectangular metal ground, and the rectangular feed unit is connected with the comma-shaped patch, so that the comma-shaped patch and the rectangular feed unit are combined into an integral conductive unit. The comma-shaped patch comprises a comma-shaped patch body I and a comma-shaped patch body II, and the comma-shaped patch body I and the comma-shaped patch body II are perpendicular to each other. According to the utility model, the isolation degree between the two ports is improved through the vertical arrangement of the comma-shaped patch I and the comma-shaped patch II, and the antenna has the advantages of simple and compact structure, small size and wide impedance bandwidth.

Description

Technical Field

[0001] The utility model relates to the field of microwave antennas, in particular to a medical ultra-wideband notch antenna, which is mainly used in the field of microwave medical communications. Background Art

[0002] In 2002, ultra-wideband communication ushered in a milestone development. In February 2002, the U.S. Federal Communications Commission (FCC) officially approved the 3.1-10.6 GHz ultra-wideband (UWB) frequency band for civilian communications, which has attracted widespread attention from countries around the world. Ultra-wideband technology has the advantages of high data transmission rate, low cost, low power consumption, and strong anti-interference ability.

[0003] Multiple-Input Multiple-Output (MIMO) technology uses multiple transmit and receive antennas at both the transmitter and receiver ends, respectively, allowing signals to be transmitted and received via these multiple antennas, thereby improving communication quality. It fully utilizes spatial resources, enabling multiple transmissions and multiple receptions through multiple antennas. This significantly increases system channel capacity without increasing spectrum resources or antenna transmit power, demonstrating significant advantages and is considered a core technology for next-generation mobile communications.

[0004] In addition, there are many other communication frequency bands within the operating frequency band of the ultra-wideband communication system, such as wireless local area network WLAN (02.11a, 5.15-5.35GHz, 5.725-5.825GHz), industrial, scientific and medical frequency band (ISM) (5.725-5.850GHz), etc. In order to prevent conflicts between the ultra-wideband communication system and the WLAN and ISM communication systems during the communication process, the frequency bands used by WLAN and ISM must be eliminated when designing the ultra-wideband communication system to ensure the normal operation of the ultra-wideband communication system. Therefore, how to suppress the interference between WLAN, ISM communication systems and ultra-wideband communication systems has become a hot research issue.

[0005] With the rapid development of ultra-wideband, MIMO, and notch technologies, and the combined advantages of ultra-wideband notch and MIMO, ultra-wideband MIMO notch wireless communication technology has emerged. As a key component of wireless communication systems, research on ultra-wideband MIMO notch antennas is gaining increasing attention. Currently, wireless communication equipment is moving towards miniaturization and high isolation. Improving the isolation between MIMO antennas without increasing antenna size is a key issue that needs to be addressed. Utility Model Content

[0006] The utility model aims to provide a medical ultra-wideband two-unit MIMO notch antenna based on a C-shaped slot, which has a simple and compact structure, small size, high port isolation and adjustable notch frequency band.

[0007] The technical solution of this utility model;

[0008] A medical ultra-wideband two-unit MIMO notch antenna based on a C-shaped slot is characterized by comprising a rectangular dielectric, two comma-shaped patches with identical structures, a rectangular feeding unit, a rectangular metal ground, and a C-shaped notch unit; the rectangular dielectric is filled between the comma-shaped patch and the rectangular metal ground; the rectangular feeding unit is located in front of the rectangular metal ground, and the rectangular feeding unit is connected to the comma-shaped patch, so that the comma-shaped patch and the rectangular feeding unit are combined into an integral conductive unit.

[0009] Furthermore, the C-shaped notch element is located in the comma-shaped patch to achieve the notch radiation characteristics of the MIMO antenna.

[0010] Furthermore, the length of the C-shaped notch unit ranges from 13.0 mm to 16.4 mm, and the width ranges from 0.1 mm to 0.6 mm.

[0011] Furthermore, the comma-shaped patch includes a comma-shaped patch 1 and a comma-shaped patch 2, and the comma-shaped patch 1 and the comma-shaped patch 2 are placed perpendicular to each other.

[0012] Furthermore, the minimum distance between the comma-shaped patch 1 and the comma-shaped patch 2 is 4.5 mm, which can realize the miniaturization design of the two-unit MIMO notch antenna.

[0013] The advantages of the present invention are:

[0014] The C-groove-based medical ultra-wideband two-unit MIMO notch antenna designed by the utility model has the advantages of simple and compact structure, small size, high port isolation, and adjustable notch ISM frequency band, and is suitable for most ultra-wideband communication systems.

[0015] The utility model adopts a vertical placement mode of two antenna radiation patches, which can effectively reduce the coupling between the two antenna radiation units in the entire working frequency band, thereby improving the isolation between the antenna units.

[0016] The isolation between antenna units of the C-shaped slot-based medical ultra-wideband two-unit MIMO notch antenna designed by the utility model is greater than 16.5dB.

[0017] By adjusting the size of the C-shaped notch unit, the medical ultra-wideband two-unit MIMO notch antenna based on the C-shaped slot designed by the utility model has the adjustability of notching the ISM frequency band, and the antenna operates in a frequency range of 2.73 to 11.54 GHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of the top view of the structure of the medical ultra-wideband two-unit MIMO notch antenna based on the C-shaped slot.

[0019] Figure 2 The utility model is a side view structural diagram of a medical ultra-wideband two-unit MIMO notch antenna based on a C-shaped slot.

[0020] Figure 3 The utility model discloses a standing wave ratio (VSWR) frequency response curve and an S-parameter curve of a medical ultra-wideband two-unit MIMO notch antenna based on a C-shaped slot.

[0021] Figure 4 The utility model discloses the radiation pattern of the medical ultra-wideband two-unit MIMO notch antenna based on the C-shaped slot at 4, 7 and 10 GHz.

[0022] exist Figures 1 to 2 In the figure, 1 is a rectangular dielectric, 2 is a comma-shaped patch, 3 is a rectangular feeding unit, 4 is a rectangular metal ground, and 5 is a C-shaped notch unit. DETAILED DESCRIPTION

[0023] The following is a further description of the implementation of the technical solution of the present utility model in conjunction with the accompanying drawings:

[0024] Figures 1-2 The embodiment of the utility model is given in the following: a medical ultra-wideband two-unit MIMO notch antenna based on a C-shaped slot, characterized by comprising a rectangular dielectric 1, two comma-shaped patches 2 of identical structure, a rectangular feed unit 3, a rectangular metal ground 4, and a C-shaped notch unit 5; the rectangular dielectric 1 is filled between the comma-shaped patch 2 and the rectangular metal ground 4; the rectangular feed unit 3 is located in front of the rectangular metal ground 4, and the rectangular feed unit 3 is connected to the comma-shaped patch 2, so that the comma-shaped patch 2 and the rectangular feed unit 3 are combined into an integral conductive unit. The C-shaped notch unit 5 is located in the comma-shaped patch 2 to realize the notch radiation characteristics of the MIMO antenna; the length of the C-shaped notch unit ranges from 13.0mm to 16.4mm, and the width ranges from 0.1mm to 0.6mm. The comma-shaped patch 2 includes a comma-shaped patch 1 21 and a comma-shaped patch 2 22, and the comma-shaped patch 1 21 and the comma-shaped patch 2 22 are placed perpendicular to each other; the minimum distance between the comma-shaped patch 1 21 and the comma-shaped patch 2 22 is 4.5 mm, which can realize the miniaturization design of the two-unit MIMO notch antenna.

[0025] The present invention's C-slot-based medical ultra-wideband two-unit MIMO notch antenna uses an FR4 rectangular dielectric with a dielectric constant of 4.4. Its length and width are 68mm and 31mm, respectively, and its thickness is 1.6mm. Two comma-shaped patches of identical structure are placed vertically. The comma-shaped patch is formed by evolving from three circles, where the radii of the two large circles are 12mm and 11mm, respectively, and the radius of the small circle is 7.5mm. The distances from the centers of the two large circles to the bottom edge of the rectangular dielectric are 17.5mm and 17mm, respectively, and the distance from the center of the small circle to the bottom edge of the rectangular dielectric is 21.5mm. The length and width of the rectangular feed unit are 5.5mm and 3mm, respectively; the length and width of the rectangular metal ground are 5mm and 30mm, respectively. The C-shaped notch unit is 15.6mm long and 0.3mm wide; the minimum distance between comma-shaped patch one and comma-shaped patch two is 8.0mm.

[0026] Compare with Figure 3 , Figure 3 The standing wave ratio and S parameter frequency response diagram of the medical ultra-wideband two-unit MIMO notch antenna based on C-shaped slot are given. Figure 3 It can be seen that the operating frequency ranges (VSWR < 2) of the two antenna units are 2.87~11.58GHz and 2.73~11.54GHz respectively, and the notched frequency bands are 4.82~5.93GHz and 4.96~5.92GHz respectively, which include the WLAN and ISM bands; and S 21 、S 12 The isolation between the two antenna units is greater than 16.5dB within the operating frequency band.

[0027] Compare with Figure 4 , Figure 4 The radiation patterns of the medical ultra-wideband two-unit MIMO notch antenna based on C-slot at 4, 7, and 10 GHz in xz, yz, and xy planes are given. Figure 3 It can be seen that at these three frequency points, the antenna's radiation pattern has quasi-omnidirectional radiation characteristics.

[0028] This C-slot-based medical ultra-wideband two-element MIMO notch antenna operates in the 2.66-11.6 GHz frequency range. The isolation between the two antenna elements is greater than 16.5 dB, indicating high port isolation. Furthermore, the C-slot-based medical ultra-wideband two-element MIMO notch antenna exhibits quasi-omnidirectional radiation characteristics at frequencies of 4, 7, and 101 GHz. Furthermore, the antenna boasts a simple and compact structure, small size, ease of fabrication, and adjustable notch frequency bands. Therefore, this antenna has broad medical application prospects.

Claims

1. A medical ultra-wideband two-element MIMO notch antenna based on a C-shaped slot, characterized by: It includes a rectangular medium (1), two comma-shaped patches (2) with the same structure, a rectangular feeding unit (3), a rectangular metal ground (4) and a C-shaped trap unit (5); Filling a rectangular dielectric (1) between the comma-shaped patch (2) and the rectangular metal ground (4); The rectangular feeding unit (3) is located on the front side of the rectangular metal ground (4), and the rectangular feeding unit (3) is connected to the comma-shaped patch (2), so that the comma-shaped patch (2) and the rectangular feeding unit (3) are combined into an integral conductive unit.

2. The C-slot-based medical ultra-wideband two-unit MIMO notch antenna according to claim 1, characterized in that: The C-shaped notch unit (5) is located in the comma-shaped patch (2) to achieve the notch radiation characteristics of the MIMO antenna.

3. The C-slot-based medical ultra-wideband two-unit MIMO notch antenna according to claim 2, characterized in that: The length of the C-shaped notch unit ranges from 13.0 mm to 16.4 mm, and the width ranges from 0.1 mm to 0.6 mm.

4. The C-slot-based medical ultra-wideband two-unit MIMO notch antenna according to claim 1, characterized in that: The comma-shaped patch (2) includes a comma-shaped patch one (21) and a comma-shaped patch two (22), and the comma-shaped patch one (21) and the comma-shaped patch two (22) are placed vertically to each other.

5. The C-slot-based medical ultra-wideband two-unit MIMO notch antenna according to claim 4, characterized in that: The minimum distance between the comma-shaped patch 1 (21) and the comma-shaped patch 2 (22) is 4.5 mm, which can realize the miniaturization design of the two-unit MIMO notch antenna.

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