CN202134654U - A Notch Ultra-Wideband Antenna - Google Patents

Abstract

The utility model provides a trap wave ultra-wideband antenna, which includes a dielectric substrate, a radiation unit located on one side of the dielectric substrate, a microstrip feeder, a part of the ground surface located on the other side of the dielectric substrate, and a part of the ground surface is etched with The groove and the radiating unit are circular patches, the microstrip feeder is directly connected to the radiating unit, the microstrip feeder is connected to the inner conductor of the SMA, and the outer conductor of the SMA is connected to a part of the ground plane. The utility model mainly utilizes the annular radiation unit and the microstrip feeding mode to realize the ultra-wideband communication requirement. In order to further increase the impedance bandwidth of the antenna, an "I"-shaped groove is etched on part of the ground plane, thereby covering the entire bandwidth of the UWB. A tuned microstrip line is inserted in the middle of the ring-shaped radiation unit to generate notch characteristics. The antenna has a simple structure, wide working bandwidth, is convenient for mass production, and has low cost.

Description

A Notch Ultra-Wideband Antenna

technical field

The utility model relates to an antenna. Specifically, it is a notch ultra-wideband antenna. The antenna can be used to receive and transmit radio waves.

Background technique

Since radio communication equipment and electronic information equipment are developing toward multi-functionality, miniaturization, ultra-wideband, and friendly coordination with the surrounding environment, this makes broadband, miniaturization, and high gain one of the hot research topics at home and abroad. In recent years, various UWB antennas have come out one after another, especially UWB antennas using microstrip technology. This structure can be fabricated by photography or photolithography, and has better polarization characteristics, so this technology has been applied In the design of ultra-wideband antennas and the design of related microwave circuit components. However, the frequency band occupied by the current ultra-wideband communication and the wireless local area network have a common part, so the ultra-wideband antenna that needs to be designed can reduce or even not bring interference to the wireless local area network, so design an ultra-wideband antenna with notch characteristics become the hotspot of current research. If the harmonics and spurious emissions are suppressed through proper design, such an antenna will not cause electromagnetic interference to nearby equipment, endangering the normal operation of the system itself and neighboring systems, especially causing serious interference to the currently used wireless local area network system . The traditional way is to add a filter is the most commonly used method, after the system is completed, add a suitable filter between the antenna unit and the radio frequency component to solve it. Usually, this method will cause mismatch between the antenna and the microwave circuit, and even reduce the overall performance of the system. Therefore, designing an ultra-wideband antenna with notch characteristics is one of the important methods to solve this problem.

Traditional printed UWB antennas are mainly conical antennas and printed disc-cone antennas. In order to reduce the size, the Chinese patent "A UWB Ladder Floor Printed Monopole Antenna, Application No. 2005100242288.7" describes a method based on a ladder-type ground plate and An ultra-wideband antenna with an elliptical radiating element, but the bandwidth of the antenna is limited, which still cannot meet the application of UWB, and cannot overcome the electromagnetic interference problems of UWB and WLAN. The document "Harmonic Control For An Integrated Microstrip AntennaWith Loaded Transmission Line, Shun-Yun Lin, Kuang-Chih Huang, and Jin-Sen Chen. MicrowaveAnd Optical Technology Letters, Vol.44, No.4, February, 2005", proposed a The periodic structure is used to suppress harmonics, and the periodic filter structure is directly added to the back end of the ultra-wideband antenna to generate notch characteristics, so as to realize the cooperative work of UWB and WLAN, but the volume is large and the structure is complex. In order to overcome the above shortcomings, the document "Design of a 5.8-GHz Antenna Incorporating a New Patch Antenna, Ching-Hong K.Chin, Quan Xue, Chi Hou Chan, IEEE Antennas And Wireless Propagation, Vol.4, 2005", expounded the common The method of etching the filter on the surface waveguide feeder signal line produces notch characteristics, but the volume is still large, which cannot well realize the miniaturization design of the system, and the production requirements of the antenna are relatively high. Literature "A miniaturized monopole antenna for ultra-wide bandapplications with band-notch Filter, B. Ahmadi, R. Faraji-Dana, IET Microw. Antennas Propag., 2009, Vol.3, No.14, pp.1224-1231. "Expounded the UWB antenna with notch characteristics etched U-shaped groove and V-shaped groove, but the volume is large, and the gradual change feed structure is used, which brings inconvenience to design and debugging. The document "Compact CPW-fedultra-wideband antenna with dual band-notched characteristics, Y.S.LI, X.D.Yang, C.Y.Liu, T.Jiang, Electronics Letters, 2010, vol.46, No.14", adopts engraved on the radiation source unit The U-shaped slot is etched and the H-shaped slot is etched on the ground plane of the coplanar waveguide to produce notch characteristics. The antenna adopts the form of etching the slot on the radiating element, so that part of the electromagnetic wave leaks out and affects the radiation direction of the antenna. picture.

Contents of the invention

The purpose of the utility model is to provide a notch ultra-wideband antenna with simple structure, wide working bandwidth, convenient mass production and low cost.

The purpose of this utility model is achieved in that:

It includes a dielectric substrate, a radiation unit located on one side of the dielectric substrate, a microstrip feeder, a part of the ground plane located on the other side of the dielectric substrate, a part of the ground plane is etched with grooves, the radiation unit is a circular patch, and the microstrip feeder The wire is directly connected to the radiation unit, the microstrip feeder is directly connected to the inner conductor of the SMA, and the outer conductor of the SMA is connected to a part of the ground plane.

The utility model can also include:

1. There is a tuned microstrip line connected to the microstrip feeder in the circular ring of the radiation unit.

2. The groove is an "I" shaped groove.

3. The microstrip feeder is a rectangular microstrip feeder or an "I" shaped microstrip feeder.

The utility model mainly uses a ring-shaped radiation unit and a microstrip feeding mode to realize the ultra-wideband communication requirement. In order to further increase the impedance bandwidth of the antenna, an "I"-shaped groove is etched on part of the ground plane, thereby covering the entire bandwidth of the UWB. A tuned microstrip line is inserted in the middle of the ring-shaped radiation unit to generate notch characteristics. The antenna has a simple structure, wide working bandwidth, is convenient for mass production, and has low cost.

The antenna of the utility model can be used in electronic reconnaissance, electronic countermeasures and other equipments to reduce the electromagnetic interference to the wireless local area network and realize the cooperative work of UWB and WLAN.

The utility model belongs to a microstrip fed monopole antenna, the antenna is printed on a dielectric substrate, and its radiation unit is a circular patch, which is partially printed on both sides of the dielectric substrate with the circular radiation unit. Covering the entire UWB working bandwidth, an "I"-shaped groove is etched on part of the ground surface to further broaden the impedance bandwidth of the antenna, so that the designed antenna can cover the UWB communication bandwidth; at the same time, a Tune the microstrip line to generate a notch bandwidth to realize the cooperative work of UWB and WLAN (5.15GHz-5.825GHz). The antenna has good impedance bandwidth and notch characteristics, simple structure, and the center frequency of the notch bandwidth can be adjusted, thus greatly increasing its application range. The utility model adopts a printed antenna structure and a microstrip feed structure, greatly reduces the volume of the antenna, and is relatively easy to integrate with a radio frequency front-end microwave integrated circuit.

The ultra-wideband antenna may include a structure in which other slots are etched on the ground, so as to widen the impedance bandwidth of the antenna and meet the requirements of ultra-wideband communication.

The tuned microstrip line can adopt a microstrip line with a rectangular structure and a microstrip line with an I-shaped structure. By adopting these structures, the size of the antenna can be further reduced, the miniaturization of the antenna can be realized, and the notch bandwidth can be effectively generated at the same time. Suppression of unwanted spurious emissions and harmonic suppression.

According to the advantages and technical ideas of microstrip feeding, the characteristics of the technical solution adopted by the utility model are:

1. The radiation unit adopts a circular patch, which is similar to a traditional printed monopole antenna, which is easy to design and manufacture, and can ensure better impedance matching, realize broadband impedance matching, and have better omnidirectional radiation characteristics .

2. The utility model adopts a microstrip feed structure, the microstrip feeder is directly connected to the circular radiation unit, and part of the ground plane is printed on the other side of the dielectric substrate.

3. The utility model adopts the form of etching "I"-shaped grooves on part of the ground surface to change the distributed capacitance and distributed inductance of the antenna, thereby improving the impedance characteristics of the antenna feed and realizing ultra-wideband matching.

4. The utility model adds a tuned microstrip line inside the circular radiation unit, thereby changing the current distribution of the circular radiation unit, generating a resonant frequency, thereby forming a notch, and realizing ultra-wideband and wireless local area network Collaborative communication between.

Compared with the prior art, the utility model has the remarkable advantages of:

1. The utility model can achieve a wider impedance bandwidth. The designed ultra-wideband antenna can be used to etch the "I"-shaped structure on part of the ground surface to widen the impedance bandwidth of the antenna and cover the entire frequency band of UWB. The designed ultra-wideband antenna can cover 2.8GHz-10.9GHz, and at the same time generate a notch bandwidth in the WLAN frequency band to suppress the potential interference of WLAN and realize the cooperative work of UWB and WLAN;

2. The annular radiating unit and part of the grounding surface of the ultra-wideband antenna designed by the utility model are printed on both sides of the grounding plate, which is convenient for integration with the microwave system and can make the antenna more fully grounded.

3. The utility model introduces filter design theory and technology and open/short microstrip line adjustment technology. A tuned microstrip line is inserted between the fork-shaped patches of the radiating element to produce notch characteristics. The utility model adopts an open-circuit tuned microstrip line to adjust the center frequency and bandwidth of the notch. This structure saves the design of the filter, reduces the design cost and the complexity of the system, improves the overall performance of the system, and reduces the overall volume;

4. The tuned microstrip line is used to generate notch bandwidth, avoiding etching grooves on the radiation unit and the ground plane, thereby avoiding the leakage of electromagnetic waves and effectively improving the radiation characteristics of the antenna. Moreover, the antenna has a simple and compact structure, a small volume, convenient processing and low cost.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment 1;

Fig. 2 is the schematic diagram of the radiation unit and the microstrip feeder of the utility model implementation example 1;

Fig. 3 is a schematic diagram of part of the ground plane of the utility model implementation example 1;

Fig. 4 is the standing wave characteristic curve of the utility model implementation example 1;

Fig. 5 is the schematic diagram of the radiation unit and the microstrip feeder of the utility model implementation example 2;

Fig. 6 is the standing wave curve of Example 2 of the utility model.

Detailed ways

Below in conjunction with accompanying drawing example this utility model is described in more detail:

Implementation example 1:

An example of the utility model is shown in Fig. 1, Fig. 2 and Fig. 3. It consists of a dielectric substrate 107, an annular radiation unit 101, a microstrip feeder 103, a tuned microstrip line 102, a part of the ground plane 104, and an "I"-shaped groove 105 etched on the part of the ground plane. The microstrip feeder 103 is directly connected to the inner conductor of the SMA, and the outer conductor of the SMA is connected to part of the ground plane 104 . According to the structure shown in Figure 1, Figure 2 and Figure 3, as long as the appropriate size is selected, its ultra-wideband operating characteristics and notch characteristics can be satisfied.

Figure 4 is the VSWR curve of the notch ultra-wideband antenna. It can be seen from the figure that the impedance bandwidth of the VSWR (≤2:1) is 2.8-10.9GHz, which meets the needs of ultra-wideband communication. There is a notch feature between 6GHZ, which can eliminate or reduce the electromagnetic interference of the ultra-wideband antenna to the wireless LAN.

Implementation example 2:

As shown in FIG. 5 , another implementation example of the present invention is that the trap ultra-wideband antenna does not have to tune the microstrip line, so as to realize the ultra-wideband communication requirement. The UWB antenna is still composed of a ring-shaped radiating unit 201, a microstrip feeder 203, a part of the ground plane, and an "I"-shaped groove etched on part of the ground plane. The entire antenna is printed on both sides of a dielectric substrate with a dielectric constant of 3.5. The lower end of the microstrip feeder 203 of the antenna is connected to the inner conductor of the SMA. The outer conductor of the SMA is connected to part of the ground plane. According to the structure shown in Figure 5, as long as the appropriate size is selected, its ultra-wideband operating characteristics can be satisfied.

Figure 6 is the VSWR curve of the UWB antenna. It can be seen from the figure that the impedance bandwidth at the VSWR (≤2:1) is 2.8-10.9 GHz, which meets the requirements of UWB communication.

The effective wavelength of the notch characteristic region of the utility model is: λ _n =c/(f _n ε _eff ), where c is the speed of light, f _n is the center frequency of the notch wave, and ε _eff is the effective dielectric constant.

The antenna of the utility model adopts a dielectric substrate with a dielectric constant of 3.5, and the dielectric loss tangent angle is less than 10 ^-2 , and its size can be consistent with the coplanar waveguide ground plane.

Claims (5)

1. A notch ultra-wideband antenna, comprising a dielectric substrate, a radiating element positioned at one side of the dielectric substrate, a microstrip feeder, and a part of the ground plane positioned at the other side of the dielectric substrate, is characterized in that: a part of the ground plane is etched with The slot, the radiation unit is a circular patch, the microstrip feeder is directly connected to the radiation unit, the microstrip feeder is connected to the inner conductor of the SMA, and the outer conductor of the SMA is connected to a part of the ground plane. 2. A kind of notch ultra-wideband antenna according to claim 1, characterized in that: there is a tuning microstrip line connected to the microstrip feeder in the circular ring of the radiation unit. 3. A notch ultra-wideband antenna according to claim 1 or 2, characterized in that: the slot is an "I"-shaped slot. 4. A notch ultra-wideband antenna according to claim 1 or 2, characterized in that: the microstrip feeder is a rectangular microstrip feeder or an "I" shaped microstrip feeder. 5. A notch ultra-wideband antenna according to claim 3, characterized in that: said microstrip feeder is a microstrip feeder with a rectangular structure or a microstrip feeder with an "I" structure.

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