CN209516005U - A kind of flexible multifrequency antenna based on liquid crystal polymer substrate - Google Patents

Abstract

The utility model relates to a kind of flexible multifrequency antennas based on liquid crystal polymer substrate, including substrate, antenna and earth plate, the substrate is flexible material, the antenna is the circular radiation patch positioned at substrate front side, U-type groove there are two being set on antenna body, antenna side has feed line, and the earth plate is located at substrate back.Compared with prior art, the advantages that the utility model uses LCP material, has dielectric loss low, and hygroscopicity is low, high temperature resistant, resistant to chemical etching, and thermal expansion coefficient is small, thickness is small；Antenna is circular radiation patch, and three frequency working characteristics may be implemented by increasing by two U-type grooves on circular patch using improved annular ground plate.

Description

A flexible multi-frequency antenna based on liquid crystal polymer substrate

technical field

The utility model belongs to the field of wireless communication and flexible electronic communication equipment, and relates to a wearable antenna, in particular to a flexible multi-frequency antenna based on a liquid crystal polymer substrate.

Background technique

With the rapid development of modern wireless communication technology, a variety of communication systems operating in multiple frequency bands have emerged. For example, the working frequency band of the wireless local area network communication system (WLAN) is 2.4/5.2/5.8GHz (2.4-2.484/5.15-5.35/ 5.725-5.825GHz), the working frequency band of Wi-MAX is 2.5/3.5/5.5GHz (2.5-2.69/3.4-3.69/5.25-5.85GHz), the fifth generation mobile communication system (5G) work The frequency band is 3.3/4.8GHz (3.3-3.6/4.8-5.0GHz). For these communication systems working in multiple frequency bands, several different antennas were often used in the past, which not only brought great difficulties to system integration and fusion, but also increased system design costs. Therefore, research on multi-frequency antennas has become one of the research hotspots in the field of wireless communication. There are many ways to achieve multi-band antennas, including using multiple different resonance branches, using slot loading technology, and introducing parasitic unit structures.

With the continuous development and innovation of science and technology, electronic equipment is developing in the direction of miniaturization and easy installation and portability. The space available for it is becoming more and more limited, so the multi-frequency antenna is required to be more flexible and easy to cover the surface of the carrier. Has a great fit. The multi-frequency flexible antenna combined with the flexible transceiver circuit can realize the high-speed transmission of wireless signals and meet the application requirements of many flexible electronic devices. With the development of wearable technology and implantable electronic technology in recent years, it can be applied to the field of wireless communication. One of the new hotspots in flexible antenna research.

The conformable flexible multi-frequency antenna can not only achieve the purpose of aesthetics because of its structure that is easy to conform to the surface of the carrier, but also save the space of the device, and the covering on the surface of the device will not bring additional burden to the device. Therefore, flexible multi-frequency antennas that are miniaturized, conformal to the carrier, and easy to integrate will undoubtedly be the mainstream of research.

Utility model content

The purpose of this utility model is to provide a flexible multi-frequency antenna based on a liquid crystal polymer substrate 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 flexible multi-frequency antenna based on a liquid crystal polymer substrate, including a substrate, an antenna and a grounding plate, the substrate is a flexible material, the antenna is a circular radiation patch located on the front of the substrate, and the antenna body is provided with There are two U-shaped slots, a feeder line is provided on one side of the antenna, and the ground plate is located on the back of the substrate.

The U-shaped groove is composed of straight segments.

The two U-shaped slots are of different sizes, and the U-shaped slot closer to the feeder line is smaller in size.

The feeder is a 50Ω microstrip line.

The grounding plate is composed of two 1/4 circles and a rectangular plate with a rectangular groove, the rectangular plate is located between the two 1/4 circles, and the three are seamlessly connected.

The substrate is a liquid crystal polymer LCP material.

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

(1) Liquid crystal polymer (LCP) is used as the dielectric substrate. As a flexible material, LCP has good flexibility, can be bent at will, has a small thickness, and has a relatively stable dielectric constant in a wide frequency band. application prospects and practical value.

(2) The structure is simple, consisting of a circular radiation patch and an improved circular ground plate, and a 50Ω microstrip line is used for feeding. By adding two U-shaped slots on the circular patch, the triple-frequency working characteristics are realized. The antenna can work in three working frequency bands of 2.09-2.78GHz, 3.20-4.60GHz and 5.06-6.56GHz, meeting the requirements of WLAN, Wi-MAX and 5G (3.3-3.6GHz)

(3) The back of the substrate is the ground plate of the antenna, which is composed of a rectangular metal ground plate with a rectangular slot and two 1/4 circles, which can better adjust the impedance matching characteristics of the antenna and increase the antenna bandwidth.

Description of drawings

FIG. 1 is a schematic diagram of the front structure of the antenna of this embodiment;

Fig. 2 is a schematic diagram of the side structure of the antenna of this embodiment;

FIG. 3 is a schematic diagram of the rear structure of the antenna in this embodiment;

Fig. 4 shows the simulation results of S11 of the antenna of this embodiment.

Reference signs:

1 is the substrate; 2 is the antenna; 3 is the ground plate; 4 is the feeder.

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 Figures 1 to 3, a flexible multi-frequency antenna based on a liquid crystal polymer substrate includes a substrate 1, an antenna 2 and a ground plate 3, the substrate 1 is a flexible material, and the antenna 2 is a circular radiation antenna located on the front of the substrate 1. There are two U-shaped slots on the main body of the antenna 2 , a feeder 4 is provided on one side of the antenna 2 , and a ground plate 3 is located on the back of the substrate 1 .

The U-shaped groove is composed of straight segments, and the two U-shaped grooves are of different sizes, and the U-shaped groove close to the feeder 4 has a smaller size.

The feeding line 4 is a 50Ω microstrip line.

The ground plate 3 is composed of two 1/4 circles and a rectangular plate with a rectangular groove, the rectangular plate is located between the two 1/4 circles, and the three are seamlessly connected. The height of the ground plate 3 (ie the radius of the circle) is the same as the feeder line 4 .

The substrate 1 is a liquid crystal polymer LCP material.

As shown in FIG. 4 , the working frequency bands of antenna 2 are 2.09-2.78GHz, 3.20-4.60GHz and 5.06-6.56GHz.

Claims (6)

1. a kind of flexible multifrequency antenna based on liquid crystal polymer substrate, including substrate, antenna and earth plate, which is characterized in that The substrate is flexible material, and the antenna is the circular radiation patch positioned at substrate front side, and antenna body is equipped with two A U-type groove, antenna side have feed line, and the earth plate is located at substrate back.

2. a kind of flexible multifrequency antenna based on liquid crystal polymer substrate according to claim 1, which is characterized in that described U-type groove be made of straightway.

3. a kind of flexible multifrequency antenna based on liquid crystal polymer substrate according to claim 1, which is characterized in that two U-type groove size is different, and the U-type groove close to feed line is smaller.

4. a kind of flexible multifrequency antenna based on liquid crystal polymer substrate according to claim 1, which is characterized in that described Feed line be 50 Ω microstrip line.

5. a kind of flexible multifrequency antenna based on liquid crystal polymer substrate according to claim 1, which is characterized in that described Earth plate be made of two 1/4 circles and rectangular slabs with rectangular channel, the rectangular slab is located between two 1/4 circles, three Seamless connection.

6. a kind of flexible multifrequency antenna based on liquid crystal polymer substrate according to claim 1, which is characterized in that described Substrate be liquid crystal polymer LCP material.