CN209266570U - A dual-notch ultra-wideband antenna based on liquid crystal polymer - Google Patents

Abstract

The utility model relates to a double-notch ultra-broadband antenna based on liquid crystal polymer, comprising a substrate, a grounding plate, a feeder line and a radiation patch, the grounding plate, the feeder line and the radiation patch are arranged on the substrate, and the The substrate is a plate made of liquid crystal polymer, the radiation patch is an elliptical structure with a split resonant ring, the split resonant ring is an ellipse with a gap, and the gap faces the radiation patch and the feeder At the joint, the grounding plate is located on both sides of the feeder. Compared with the prior art, the dielectric substrate material of the utility model uses liquid crystal polymer, an open resonant ring is used on the oval patch, and a U-shaped groove structure is opened on the ground plate, which has low cost, high performance, small size, double Notch and other advantages.

Description

A dual-notch ultra-wideband antenna based on liquid crystal polymer

technical field

The utility model relates to an ultra-wideband antenna, in particular to a double-notch ultra-wideband antenna based on liquid crystal polymer.

Background technique

In 2002, the U.S. Federal Communications Commission (FCC) issued a new specification for broadband communication systems, with the purpose of alleviating the shortage of frequency band resources and responding to the needs of high-speed communication. The technology will be widely used in industry, medicine, civil life and other fields. However, the working frequency band of UWB antenna is different from that of existing narrowband systems, such as Wimax system (3.4-3.69GHz, 5.725-5.85GHz), WLAN system (5.15-5.35GHz, 5.725-5.825GHz) and X-band (7.25-7.75GHz , 7.9-8.4GHz) frequency bands overlap, which is prone to interference. Generally, a filter can be introduced into the ultra-wideband system to generate a notch in the corresponding frequency band, thereby reducing the signal interference between the ultra-wideband system and other systems. However, this method will lead to an increase in the size and cost of the ultra-wideband system. question.

By making certain improvements to the traditional antenna, the antenna itself has a filtering function, and a notch antenna is formed. Designing a coplanar waveguide ultra-wideband antenna with notch characteristics is one of the important methods to solve this kind of problem, and at the same time solve the problem that the current antenna structure and process are relatively complicated.

Utility model content

The purpose of this utility model is to provide a double-notch ultra-broadband antenna based on liquid crystal polymers in order to overcome the above-mentioned defects in the prior art.

The purpose of this utility model can be achieved through the following technical solutions:

A double-notch ultra-wideband antenna based on liquid crystal polymer, including a substrate, a ground plate, a feeder and a radiation patch, the ground plate, the feeder and the radiation patch are arranged on the substrate, and the substrate is a liquid crystal A plate made of polymer, the radiation patch is an elliptical structure with a split resonance ring, the split resonance ring is an ellipse with a gap, and the gap faces the connection between the radiation patch and the feeder line, The grounding plate is located on both sides of the feeder.

The feeder is in the shape of a long strip with gradually changing width, and the width gradually increases toward the direction away from the radiation patch.

There are two branches at the connection between the radiation patch and the feeder, and the two branches are symmetrically connected to both sides of the feeder.

The bifurcation is arc-shaped.

There is a U-shaped groove on the ground plate.

The ground plate, the feeder and the radiation patch are located on the same side of the substrate and are coplanar waveguide structures.

The thickness of the substrate is 0.1mm.

Compared with the prior art, the utility model has the following advantages:

(1) A split resonant ring is used on the elliptical patch, and a U-shaped groove structure is opened on the ground plate, and stop bands for WiMAX and X-band downlink frequencies are respectively added, and the antenna is generated at two frequency bands of 5.5GHz and 7.5GHz The notch feature realizes the stop band feature of Wimax (the effective working frequency range is 5.25-5.85GHz) and the X-band downlink frequency (7.25-7.75GHz), and suppresses their interference to the ultra-wideband system.

(2) The structure of the coplanar waveguide is adopted, so that the antenna is small in size, simple in structure and easy to manufacture, and is suitable for wireless communication systems and equipment.

(3) The feeding line adopts a gradual structure, which can achieve a good match with the characteristic impedance of the antenna input port compared with the coplanar waveguide feeding structure using a uniform half structure. Adjust the characteristic impedance of the coplanar waveguide by changing the width of the coplanar waveguide signal guide band, so as to analyze the input impedance at the connection between the feed structure and the antenna input port and the influence on the impedance bandwidth of the antenna, so as to achieve better matching and thus widen The impedance bandwidth of the antenna.

(4) The dielectric substrate material uses liquid crystal polymer (LCP). As a new type of flexible substrate material, liquid crystal polymer (LCP) has low thermal expansion coefficient, low cost, low loss, and a dielectric constant in a sufficiently wide range. It is very stable in the frequency range, and has the advantages of low cost, high performance and small size.

Description of drawings

Fig. 1 is the structural representation of present embodiment;

Fig. 2 is the S11 simulation result figure of the present embodiment;

Reference signs:

1 is the ground plate; 2 is the feeder; 3 is the radiation patch.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the utility model, and the detailed implementation and specific operation process are given, but the protection scope of the utility model is not limited to the following examples.

Example

As shown in Figure 1, a dual-notch UWB antenna based on liquid crystal polymer includes a substrate, a ground plane 1, a feeder 2 and a radiation patch 3, and the ground plane 1, feeder 2 and radiation patch 3 are located on the substrate On the same side of , it is a coplanar waveguide structure. The substrate is a plate made of liquid crystal polymer with a thickness of 0.1 mm. The radiation patch 3 is an elliptical structure with a split resonance ring. The split resonance ring is an ellipse with a gap, and the gap faces the radiation patch 3 and the feeder. 2, the ground plate 1 is located on both sides of the feeder 2 and has a U-shaped groove.

The feeding line 2 is in the shape of a long strip with gradually changing width, and the width gradually increases toward the direction away from the radiation patch 3 .

The connection between the radiation patch 3 and the feeder 2 has two arc-shaped branches, and the two branches are symmetrically connected to both sides of the feeder 2, so that the connection forms a trident-like structure.

The improvements of this embodiment are as follows:

(1) Flexible material

Liquid crystal polymer (LCP) is used as the dielectric substrate material of the antenna. At present, in the field of microwave and millimeter wave circuits, liquid crystal polymer (LCP), as a new type of flexible substrate material, has excellent application prospects. LCP has many excellent characteristics, including low thermal expansion coefficient, low cost, small loss, etc., and the dielectric constant of LCP is very stable in a wide enough frequency range, which makes LCP low cost, high performance, It is the best choice in the design of small size devices.

Especially in the wearable field, liquid crystal polymer (LCP) material, as a flexible material, has excellent flexibility, can be bent at will, and covers the surface of the carrier, so it has excellent and development prospects.

(2) Coplanar waveguide structure

Coplanar wave-guide (CPW for short) structure is an integrated planar transmission line structure, also known as microstrip transmission line structure, not only has the characteristics of low profile, low cost and easy conformal of microstrip line structure, but also It also has the advantages of low dispersion, easy integration and low transmission loss, and its main mode is still a quasi-TEM wave like the microstrip line structure.

(3) Double notch performance

First, for the UWB antenna without a notch, the simulation results show that the antenna covers 2.92-11GHz. By adopting a split resonant ring on the elliptical patch and opening a U-shaped slot structure on the ground plate, a stop band for WiMAX and X-band downlink frequencies is added to the operating frequency of the antenna, preventing the existing There is interference in the wireless communication frequency band. Figure 2 shows the S11 simulation results of the antenna, and it can be seen that the stop bands are used for WiMAX and X-band downlink frequencies.

Claims (7)

1. a double-notch ultra-broadband antenna based on liquid crystal polymer, comprising substrate, grounding plate, feeder and radiation patch, described grounding plate, feeder and radiation patch are arranged on the substrate, it is characterized in that, The substrate is a plate made of liquid crystal polymer, the radiation patch is an elliptical structure with a split resonance ring, the split resonance ring is an ellipse with a gap, and the gap faces the radiation patch and the At the connection of the feeder, the grounding plate is located on both sides of the feeder. 2. A kind of dual-notch ultra-broadband antenna based on liquid crystal polymer according to claim 1, characterized in that, the feeder is a strip shape with gradually changing width, and the width gradually increases towards the direction away from the radiation patch . 3. A kind of dual-notch ultra-broadband antenna based on liquid crystal polymer according to claim 1, characterized in that, the junction of the radiation patch and the feeder has two bifurcations, two bifurcations Symmetrical connection on both sides of the feeder. 4 . The liquid crystal polymer-based double-notch ultra-broadband antenna according to claim 3 , wherein the bifurcation is arc-shaped. 5 . 5 . A liquid crystal polymer-based double-notch ultra-wideband antenna according to claim 1 , wherein the ground plate has a U-shaped groove. 6 . 6. A kind of liquid crystal polymer-based dual-notch ultra-broadband antenna according to claim 1, characterized in that, the ground plate, the feeder and the radiation patch are located on the same side of the substrate as a coplanar waveguide structure . 7 . The liquid crystal polymer-based double-notch ultra-wideband antenna according to claim 1 , wherein the thickness of the substrate is 0.1 mm.