TWM522475U - Coplanar waveguide(CPW) fed four square ring multi-function microstrip antenna - Google Patents

Abstract

A novel coplanar waveguide (CPW) fed four square ring multi-function microstrip antenna is designed. The proposed antenna consists of four square ring radiation patch, dual symmetrical triangle shape ground plane and a tapered CPW-fed microstrip line. The four square ring radiation patch can generate multiband frequencies and by adjusting the gap between dual symmetrical triangle shape ground plane and CPW-fed microstrip line, modifying the area of dual symmetrical triangle shape ground plane with the width of the CPW-fed microstrip line can increase the bandwidth. The measured return loss S11 < -10 dB of the proposed antenna is 701 MHz-7.1 GHz, the impedance bandwidth is 164% and the peak gain of antenna is 1.28 dBi. The proposed antenna has good radiation patterns and the operation frequency band can cover LTE (700 MHz), GSM, GPS (1.575 GHz), DCS, PCS, UMTS, Bluetooth, LTE (2.3 GHz, 2.6 GHz), WiMAX and WLAN (2.4/5.2/5.8 GHz) wireless communication systems.

Description

Coplanar waveguide feeding quad-ring multi-function microstrip antenna

This creation is applied to the antenna of the multi-band wireless mobile communication system in the UHF (Ultra High Frequency) and SHF (Super High Frequency) bands.

IEEE (Institute of Electrical and Electronics Engineers) organization definition: In a transmitting and receiving system, an electromagnetic wave element designed to transmit or receive is called an antenna. In the wireless communication transmitting and receiving system architecture, the role of the antenna is to convert the electromagnetic wave type, the antenna at the transmitting end converts the guided wave in the circuit transmission structure into a radiated wave, and the receiving end antenna is the radiated wave in the space. Converted to a pilot wave in a circuit transmission structure. In recent years, with the advancement of technology, wireless communication technology has developed rapidly. With the popularization of tablet computers and smart phones, people are becoming more and more dependent on wireless communication products, and their requirements are getting higher and higher. Therefore, the traditional microwave frequency band (30MHz-30GHz) mobile communication devices, such as mobile phones, notebook computers, digital TVs and car navigation, are gradually being integrated one by one, and the antennas in a single operating frequency band cannot meet the needs of people, except In addition to the integration of all communication functions, communication products must also take into account the size of the product and the cost of manufacturing. The antenna is one of the most important components in wireless communication products. All communication products that need to send and receive signals must use the antenna to complete the transmission and reception of signals.

As shown in FIG. 1(a), it is a conventional four rectangular patch array microstrip antenna, which is fabricated by Coplanar Waveguide (CPW), and has a rectangular patch 10, respectively. The microstrip line 11 and the SMA connector feed point 12 are printed on the FR4 substrate 13 having a thickness of 1.6 mm as shown in Fig. 1(b).

The antenna utilizes four rectangular array patches of four-wavelength and impedance matching techniques fed by a coplanar waveguide microstrip line to achieve the desired frequency and high gain. In the case where the return loss S ₁₁ <-10 dB or the Voltage Standing Wave Ratio (VSWR) is equal to 2, the simulated and measured reflection loss map of the antenna is shown in FIG. As can be seen from Figure 2, this antenna architecture can operate in the 2.5G (Wimax) band.

After knowing the above antenna structure and characteristics, this creation proposes a new coplanar waveguide feeding quad-ring multi-function microstrip antenna, as shown in Figure 3. The structure is connected to the radiating surface 20 by four square patches, and four square ring slots 23 are dug in the square patch on the radiating surface 20. The ground plane 21 is composed of a combination of double symmetric right triangles, and the microstrip line 22 is fed in a gradual shape and printed on the FR4 substrate 24. Operating loss is 701MHz to 7.1GHz with return loss S ₁₁ <-10dB, which can meet LTE (704MHz-787MHz), GSM, GPS (1.575GHz), DCS, PCS, UMTS, Bluetooth, LTE (2.3 Wireless communication systems such as GHz-2.4GHz, 2.5GHz-2.69GHz, WiMAX, and 2.4/5.2/5.8GHz WLAN.

10‧‧‧ square patch

11‧‧‧Microstrip line

12‧‧‧SMA connector feed point

13‧‧‧FR4 substrate

20‧‧‧ Square ring radiation patch

21‧‧‧Doubly symmetric right triangle ground plane

22‧‧‧graded microstrip line

23‧‧‧ square slot

24‧‧‧FR4 substrate

Figure 1 is a diagram of a conventional rectangular array monopole antenna architecture.

Figure 2 is a diagram showing the reflection loss of a conventional rectangular array monopole antenna.

Figure 3 is a symbolic diagram of the original size of the antenna surface of the antenna.

Figure 4 is a symbolic diagram of the original size of the original view of the antenna.

Figure 5 is a schematic diagram of the original size symbol of the side view of the antenna.

Figure 6 is a diagram of the antenna reflection loss of the present creation.

Figure 7(a) is the antenna measurement field map of this creation 700MHz

Figure 7(b) is the original antenna measurement field map 920MHz

Figure 7(c) is the original antenna measurement field map 1.5GHz

Figure 7(d) is the antenna measurement field map of this creation.

Figure 7(e) is the antenna measurement field map of this creation.

The 7th (f) diagram is the antenna measurement field map of the present creation.

The 7th (g) figure is the antenna measurement field map of this creation. 2.3GHz

Figure 7(h) is the original antenna measurement field map 2.4GHz

Figure 7(i) is the original antenna measurement field map of 2.6GHz

The 7th (j) diagram is the original antenna measurement field map 3.5GHz

The 7th (k) diagram is the original antenna measurement field map 5.2GHz

The 7th (l) figure is the antenna measurement field map of this creation.

Figure 8 is a plot of the measured gain of the antenna.

Please refer to Figure 3, Figure 4, Figure 5 and Figure 6. This is a coplanar waveguide feeding quad-ring multi-functional microstrip antenna with four square patch connections as radiation. Face, and dig four square slots 23 in the square patch on the radiating surface 20. The ground plane is composed of a combination of double symmetric right triangles. The microstrip line is fed in a gradual shape, and the antenna is printed on the FR4 substrate 24, and the overall size is L×W×h=40×30×1.6 mm ³ .

In order to achieve good impedance matching, the microstrip line 22 is designed to be tapered, and the top and bottom widths are respectively M ₁ and M ₂ , and then the width of the square is easier to achieve the radiation patch 20 by using the square. The radiation patch 20 is made of four squares, each of which has a height L ₁ and a width W ₁ , and the left and right sides of the radiation patch 20 and the width of the tapered microstrip line 22 are M ₁ and M ₂ . The 21 part of the ground is composed of double-symmetric right-angled triangles. The above antenna structure and size are optimized to achieve multi-band operation requirements.

The creation uses the method of grooving holes to change the current path on the antenna so that the bandwidth is increased to the required frequency band. The square slot 23 is formed by first adding a square slot of S ₁ ×S ₂ to the radiation patch 20. This slot can achieve coverage for GPS in the frequency band that was not covered. The other slot S ₃ is formed by adding an isosceles triangle S ₃ to the radiation patch 20 for the purpose of attenuating the current when the path is 180°, and reducing the current when the slot is cut. Attenuation to achieve a good impedance bandwidth, this slot S ₃ can meet the demand for the WLAN 5.8 GHz that was not reached at the beginning. The antenna entity size is shown in Table 1.

Figure 6 shows the measured antenna reflection loss map. After the implementation of the antenna, the 8720ES network analyzer is used for measurement. In the case of S11<-10dB, the operating frequency band can be from 701MHz to 7.1GHz. Wireless communication such as LTE (704MHz-787MHz), GSM, GPS (1.575GHz), DCS, PCS, UMTS, Bluetooth, LTE (2.3GHz-2.4GHz, 2.5GHz-2.69GHz), WiMAX, and 2.4/5.2/5.8GHz WLAN system.

Figure 7(a) - Figure 7(l) shows the antenna measurement field pattern with measurement frequencies of 700MHz, 920MHz, 1.575GHz, 1.8GHz, 1.9GHz, 2.0GHz, 2.3GHz, 2.4GHz, 2.6 GHz, 3.5 GHz, 5.2 GHz, and 5.8 GHz, the solid line is co-polarization, and the broken line is cross-polarization.

Figure 8 shows the measured gain map of the proposed antenna. The measurement gain is from 0.7 GHz to 5.8 GHz. The detailed antenna gain values are shown in Table 2.

20‧‧‧ Square ring radiation patch

21‧‧‧Doubly symmetric right triangle ground plane

22‧‧‧graded microstrip line

23‧‧‧ square slot

24‧‧‧FR4 substrate

Claims (5)

A coplanar waveguide feeding quad-ring multi-functional microstrip antenna comprises: a substrate; a quadruple ring radiation patch disposed on the substrate, which can make the antenna operating frequency band meet UMTS, Bluetooth, LTE (2.3GHz-2.4 GHz, 2.5GHz-2.69GHz), WiMAX and 2.4/5.2GHz; a tapered microstrip line, which is arranged on the substrate, which can enhance the current intensity, which can make the antenna operating frequency band satisfy DCS, PCS; square slot is provided in On the square radiating patch, the slot can achieve the coverage effect for the GPS band that was not covered at the beginning; the double symmetric right triangle grounding surface is set on the substrate; the height L _{2 of the} double symmetric right triangle grounding surface will affect The width of the overall band. The coplanar waveguide according to claim 1 is fed into a square-ring multi-functional microstrip antenna, wherein the radiation patch is composed of four square rings, each square having a height of L ₁ = 10 mm and a width W ₁ = 10 mm. . The coplanar waveguide according to claim 1 is fed into a quad-ring multi-functional microstrip antenna, wherein the microstrip line is designed as a gradual shape and connected to the radiation patch, and the top and bottom widths are respectively M ₁ = 2mm and M ₂ = 3mm. The coplanar waveguide according to claim 1 is fed into a square ring multi-functional microstrip antenna, and the height of the ground plane of the double symmetric right triangle is L ₂ = 19.5 mm. The coplanar waveguide according to claim 1 is fed into a square-ring multi-functional microstrip antenna, wherein the square slot is formed by adding a slot having a length and a width of S ₁ =4 mm and S ₂ =4 mm respectively on the radiation patch. The hole is completed and this structure can generate a frequency band of 1.575 GHz.