CN202034480U

CN202034480U - Microstrip antenna possessing filtering function

Info

Publication number: CN202034480U
Application number: CN201120009755XU
Authority: CN
Inventors: 李九生; 何云红
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2011-01-13
Filing date: 2011-01-13
Publication date: 2011-11-09
Anticipated expiration: 2021-01-13

Abstract

The utility model discloses a microstrip antenna possessing a filtering function, comprising a filtering feeding network, a second radiation layer, a third radiation layer, a first feeding point, a second feeding point and a substrate. The filtering feeding network is a cascade connection of eight filtering microstrip structures and antenna oscillators, a first radiation layer is the antenna oscillator of the filtering feeding network, and the second radiation layer and the third radiation layer are formed by connecting two patch oscillators via air; the substrate is equipped with the filtering feeding network, the second radiation layer and the third radiation layer in turn, and the first feeding point and the second feeding point are led out downwards from the filtering feeding network respectively. The microstrip antenna possessing the filtering function possesses a conformal integrative design of a filtering circuit and the antenna oscillators, can inhibit the frequency multiplication interference signal accessed in the antenna effectively, and also has certain inhibition effect on the adjacent frequency interference. By using the microstrip antenna possessing the filtering function, the interference signal can be attenuated at a front-end device greatly, the noise signal intensity accessed in a system can be weakened substantially, and the communication quality can be improved.

Description

Microstrip antenna with filter function

Technical field

The utility model relates to antenna, relates in particular to a kind of microstrip antenna with filter function.

Background technology

As cable LAN (Local Area Network, LAN) extension, WLAN (wireless local Area Network WLAN) as transmission medium, provides the function of traditional LAN with the wireless multiple access channel, has realized at any time, broadband network inserts everywhere.Since its high flexibility, easily mobile, easily installation, easily planning, and advantages such as easy expansion, manageability, easy care make the WLAN development very rapid, and are widely used in places such as enterprise, hospital, factory and schools.

Antenna is as the basic element of character of any radio system, and the quality of its performance will directly influence the performance of wireless device.Along with the continuous development of radio communication and radar system, also more and more higher to the requirement of antenna performance.Will seeking development of characteristics such as antenna is simple, in light weight towards making, volume is little, easily conformal, broadband and cost be low.Characteristics such as microstrip antenna has volume little, and is in light weight, and low section is easily conformal, and is easy of integration have just in time satisfied the performance requirement of antenna development, so have been subjected to people's attention in recent years deeply, use also more and more widely.

In order effectively to suppress to enter the frequency multiplication interference signal of antenna, the neighbour disturbed frequently also certain inhibition ability, adopted the conformal one designing technique of filtering feeding network and antenna oscillator, thereby interference signal is subjected to than high attenuation at headend equipments such as antennas, weaken the noise signal strength of the system of entering greatly, improve communication quality.

Summary of the invention

The utility model provides a kind of microstrip antenna with filter function in order to suppress the signal of some frequency range.

In order to achieve the above object, the technical solution of the utility model is as follows:

Microstrip antenna with filter function comprises filtering feeding network, second radiating layer, the 3rd radiating layer, first distributing point, second distributing point, substrate; The filtering feeding network is the cascade of eight filtering microstrip structures and antenna oscillator, first radiating layer is the antenna oscillator in the filtering feeding network, second radiating layer and the 3rd radiating layer are connected to form by the air microstrip structure by two antenna patch oscillators respectively, on substrate, be provided with filtering feeding network, second radiating layer and the 3rd radiating layer in turn, draw first distributing point and second distributing point downwards respectively by the filtering feeding network.

The characteristic impedance of described filtering microstrip structure is 100 Ω, and as a shunt of 2 power splitters, the characteristic impedance after 2 shunt are synthetic is 50 Ω.Described first distributing point and second distributing point adopt coaxial feeding, and characteristic impedance is 50 Ω.

The utlity model has the filtering feeding network and the conformal one designing technique of antenna oscillator of original creation, can effectively suppress to enter the frequency multiplication interference signal of antenna, the neighbour disturbed frequently also certain inhibition ability, thereby interference signal is subjected to than high attenuation at headend equipments such as antennas, weaken the noise signal strength of the system of entering greatly, improve communication quality.

Description of drawings

Fig. 1 is the structural front view with microstrip antenna of filter function;

Fig. 2 is the structure side view with microstrip antenna of filter function;

Fig. 3 is the filtering feeding network front view with microstrip antenna of filter function;

Fig. 4 is the standing-wave ratio curve chart with microstrip antenna of filter function;

Fig. 5 is the antenna pattern with microstrip antenna E face of filter function;

Fig. 6 is the antenna pattern with microstrip antenna H face of filter function.

Embodiment

As depicted in figs. 1 and 2, the microstrip antenna with filter function comprises filtering feeding network 1, first radiating layer 2, second radiating layer 3, first distributing point 4, second distributing point 5, substrate 6; Filtering feeding network 1 is the cascade of eight filtering microstrip structures 7 and antenna oscillator 8, second radiating layer 2 and the 3rd radiating layer 3 are connected to form by the air microstrip structure by two antenna patch oscillators respectively, on substrate 6, be provided with filtering feeding network 1, second radiating layer 2 and the 3rd radiating layer 3 in turn, draw first distributing point 4 and second distributing point 5 downwards respectively by filtering feeding network 1.

The characteristic impedance of described filtering feeding network 1 is 100 Ω, and as a shunt of 2 power splitters, the characteristic impedance after 2 shunt are synthetic is 50 Ω.Described first distributing point 4 and second distributing point 5 adopt coaxial feeding, and characteristic impedance is 50 Ω.

Consider the factors such as radiation mechanism, feeding classification, coupling and processing technology thereof of various radiating element shapes, the antenna patch oscillator constitutes first width of cloth and penetrates layer in the described filtering feeding network, second radiating layer is made of 2 rectangle oscillators, and its length is 44mm, width 40mm; The 3rd radiating layer is made of 2 rectangle oscillators, and its length is 44mm, and width is 40mm.The geometric center of first radiating layer, second radiating layer and the 3rd radiating layer is aimed at, respectively corresponding first distributing point 4 and second distributing point 5.First distributing point 4 and second distributing point 5 adopt coaxial feeding, and characteristic impedance is 50 Ω.Electric current flows into filtering feeding network and radiating element from first distributing point 4 and second distributing point 5.

Embodiment 1:

Microstrip antenna with filter function:

Described first radiating layer partly is made of antenna oscillator in the filtering feeding network, and radiating element is the rectangle oscillator, and rectangle is long to be 68.5mm, and width is 49.5mm.Second radiating layer is made of 2 rectangle oscillators, and its length is 44mm, width 40mm; The 3rd radiating layer is made of 2 rectangle oscillators, and its length is 44mm, and width is 40mm.The thickness of first radiating layer, second radiating layer and the 3rd radiating layer all is 1.2mm.First distributing point and second distributing point adopt coaxial feeding, and characteristic impedance is 50 Ω, and the diameter of coaxial line is 3.5mm.Adopt network analyzer that the standing-wave ratio curve and the radiation characteristic of microstrip antenna with filter function are measured, the standing-wave ratio curve of gained as shown in Figure 3.As seen from Figure 3, frequency range is when 2.4-2.5GHz, and standing-wave ratio is less than 1.4, and frequency range is when 4.8-6GHz, and standing-wave ratio is greater than 2.7, effectively suppresses the frequency multiplication interference signal that enters antenna, and the neighbour is disturbed frequently also certain inhibition ability, improves communication quality.

Claims

1. the microstrip antenna with filter function is characterized in that comprising filtering feeding network (1), second radiating layer (2), the 3rd radiating layer (3), first distributing point (4), second distributing point (5), substrate (6); Filtering feeding network (1) is the cascade of eight filtering microstrip structures (7) and antenna oscillator (8), first radiating layer is the antenna oscillator (8) in the filtering feeding network (1), second radiating layer (2) and the 3rd radiating layer (3) are connected to form by the air microstrip structure by two antenna patch oscillators respectively, on substrate (6), be provided with filtering feeding network (1), second radiating layer (2) and the 3rd radiating layer (3) in turn, draw first distributing point (4) and second distributing point (5) downwards respectively by filtering feeding network (1).

2. a kind of microstrip antenna with filter function as claimed in claim 1 is characterized in that,

The characteristic impedance of described filtering microstrip structure (7) is 100 Ω, and as a shunt of 2 power splitters, the characteristic impedance after 2 shunt are synthetic is 50 Ω.

3. a kind of microstrip antenna with filter function as claimed in claim 1 is characterized in that, described first distributing point (4) and second distributing point (5) adopt coaxial feeding, and characteristic impedance is 50 Ω.