CN108539356B - Ultra-wideband slot antenna with filtering function - Google Patents

Ultra-wideband slot antenna with filtering function Download PDF

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Publication number
CN108539356B
CN108539356B CN201810272337.6A CN201810272337A CN108539356B CN 108539356 B CN108539356 B CN 108539356B CN 201810272337 A CN201810272337 A CN 201810272337A CN 108539356 B CN108539356 B CN 108539356B
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antenna
microstrip line
slot
ultra
wideband
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CN108539356A (en
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席晓莉
杨海龙
赵雨辰
王丽黎
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Xian University of Technology
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Xian University of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/08—Strip line resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
    • H01Q5/25—Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems

Abstract

The invention discloses an ultra-wideband slot antenna with a filtering function, which comprises a dielectric plate, wherein a step feed microstrip line is arranged on the top surface of the dielectric plate along the central line, an open slot is arranged in an antenna back plate, and the position of the open slot is coupled with the step feed microstrip line; in the antenna back plate, a narrow band slot is arranged near the opening slot. The invention greatly improves the frequency selection characteristic of the sideband on the premise of not increasing the size of the antenna, improves the suppression of out-of-band interference signals, and is applied to the ultra-wideband fields of target detection, target tracking, short-distance wireless communication and the like.

Description

Ultra-wideband slot antenna with filtering function
Technical Field
The invention belongs to the technical field of ultra-wideband antennas, and relates to an ultra-wideband slot antenna with a filtering function.
Background
With the development of wireless communication technology, ultra-wideband communication technology has been developed very well in recent years, and ultra-wideband antennas have been widely researched as important components in ultra-wideband communication.
In practical engineering application, due to the wide bandwidth of the ultra-wideband, the ultra-wideband is easily affected by some out-of-band interference signals. The introduction of interfering signals in the received signal can seriously affect the reception performance of the receiver. In conventional engineering applications, a band-pass filter is usually connected in series at the back end of the receiving antenna to suppress the interference of out-of-band signals. However, this approach, where the antenna and filtering are two separate devices, increases the size and cost of the rf front-end. Therefore, designing an ultra-wideband filter with a filter function is significant for reducing the size of the radio frequency front end and reducing the cost. In 2013, Sai Wai Wong proposed a planar printed antenna, which uses 4 short-circuit connection lines to connect a radiation panel and a floor, thereby realizing the improvement of frequency selection characteristics and the filtering characteristics, and the size of the antenna is 28.5mm × 28 mm. The defects of the antenna are that the frequency selection characteristics of the upper and lower side bands are difficult to adjust and are not easy to improve. In 2016, r.li and p.gao, and 2017, saho, Anuj Kumar, monopole printed radiation antenna is adopted, and the frequency selection characteristic of the antenna is improved by designing a feed microstrip line with a filter characteristic at the position of the feed microstrip line. This approach is similar to integrating the filter at the feed end of the antenna, saving a separate filter to some extent. But the size of the whole antenna is increased by adding the filtering structure, and is respectively 28.5mm x 28mm and 53mm x 42 mm. Under the condition that the size of the antenna is not increased, the frequency selection characteristic of the antenna is improved, so that the antenna has a good out-of-band suppression effect, and the antenna has important significance for the application of the ultra-wideband antenna in ultra-wideband communication.
Disclosure of Invention
The invention aims to provide an ultra-wideband slot antenna with a filtering function, and solves the problems of large size and high cost of an independent antenna and a filter in the traditional radio frequency front end.
The invention adopts the technical scheme that the ultra-wideband slot antenna with the filtering function comprises a dielectric plate, wherein a step feed microstrip line is arranged on the top surface of the dielectric plate along the central line, an opening slot is arranged in an antenna back plate, and the position of the opening slot is coupled with the step feed microstrip line; in the antenna back plate, a narrow band slot is arranged near the opening slot.
The ultra-wideband slot antenna with the filtering function is further characterized in that:
the step feed microstrip line adopts a feed microstrip line structure with high and low impedance.
In the step feed microstrip line, the length of the step microstrip line is L respectively4＝2mm，L6＝1.6mm，L 82 mm; the distances between the step microstrip lines are L respectively5＝0.7mm，L7＝2.4mm，L 92 mm; the width of the connecting step microstrip line is W30.4 mm; rectangular width of stepped microstrip line terminalDegree W62mm, length L3＝5.4mm。
The opening length L of the opening slot (3) in the antenna back plate24.2mm, gap length L108.1mm, width W10.5mm, the distance between the open slot and the feed port is L1＝15mm。
The length L of the narrow band slot in the antenna back plate118.5mm, width W2＝0.5mm。
The invention has the advantages of comprising a dielectric plate, a step feed microstrip line with a filtering function, an open slot and a narrow-band slot capable of prolonging a current path. The frequency selection characteristic of the reflection coefficient of the ultra-wideband antenna at high frequency can be improved by adopting the step feed microstrip line; the impedance and frequency selectivity characteristics at low frequencies can be improved by adding narrow band slots near the open slots. The return loss of the ultra-wideband antenna in the whole frequency band of 3.1-10.6GHz is less than-10 dBm, the antenna has good frequency selection characteristics on upper and lower sidebands, out-of-band signal suppression is good, and a good filtering effect is achieved; compared with the similar antenna, the directional diagram of the antenna is omnidirectional, the invention greatly improves the frequency selection characteristic of the sideband on the premise of not increasing the size of the antenna, improves the suppression of out-of-band interference signals, and is applied to the ultra-wideband fields of target detection, target tracking, short-distance wireless communication and the like.
Drawings
Fig. 1 is a schematic view of the overall structure of the ultra-wideband antenna of the present invention;
FIG. 2 is a graph of reflection coefficient test results for an ultra-wideband antenna of the present invention;
FIG. 3 is a polar E-plane pattern at 4GHz for an ultra-wideband antenna of the present invention;
FIG. 4 is a polar H-plane directional pattern for the ultra-wideband antenna of the present invention at 4 GHz;
FIG. 5 is a polar E plane pattern at 5GHz for an ultra-wideband antenna of the present invention;
fig. 6 is a polar H-plane pattern at 5GHz for the ultra-wideband antenna of the present invention.
In the figure, 1 is a step feed microstrip line, 2 is an antenna backboard, 3 is an open slot, and 4 is a narrow slot.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the microstrip ultra-wideband antenna structure with a notch function of the present invention is that, a rogues board or other boards using microwave frequency band, such as Rogers, ceramics, etc., is selected as the dielectric board, and considering that the working frequency of the antenna is higher, the rogues board has better high frequency stability, preferably, the rogues RT/Duroid5880 dielectric board has a dielectric constant of 2.2 and a thickness of 0.787 mm; the top surface of the dielectric slab is provided with a step feed microstrip line 1 along the central line, and the step feed microstrip line 1 adopts a high-low impedance feed microstrip line structure mode, so that the high-frequency feed microstrip line has better frequency selection characteristic at high frequency;
an opening slot 3 is arranged in the antenna back plate 2, and the position of the opening slot 3 is coupled with the step feed microstrip line 1 to form a radiation effect; the opening of the open slot 3 is significantly widened, which results in better impedance and radiation characteristics at high frequencies.
In the antenna back plate 2, a narrow-band slot 4 is arranged near the opening slot 3, so that the impedance of the whole antenna at low frequency is improved, and the working bandwidth and the frequency selection characteristic of the antenna are improved well.
The overall optimal size of the common microstrip antenna is 24mm in length, 12mm in width and 0.7mm in thickness, the size of the antenna is not required to be increased, and the frequency selection characteristics of high frequency and low frequency can be improved by the step feed microstrip line 1 and the narrow band slot 4 arranged near the opening slot 3.
The effective size ranges of the parts of the structure are respectively as follows:
the whole length L of the antenna is 24mm +/-0.1 mm, the width W of the antenna is 12mm +/-0.1 mm, and the thickness of the antenna is 0.787mm +/-0.001 mm;
in the symmetrical step feed microstrip line 1, the length of the step microstrip line is L4＝2mm，L6＝1.6mm，L 82 mm; the distances between the step microstrip lines are L respectively5＝0.7mm，L7＝2.4mm，L 92 mm; the width of the connecting step microstrip line is W30.4 mm; rectangular width W of terminal of step microstrip line62mm, length L3＝5.4mm；
Opening length L of opening slot 3 in antenna back plate 224.2mm, gap length L108.1mm, width W10.5mm, the distance of the open slot 3 from the feed port is L1＝15mm；
Length L of narrow band slot 4 in antenna backplane 2118.5mm, width W2＝0.5mm。
FIG. 2 is a reflection coefficient test result curve of the UWB antenna with the notch function, wherein the ordinate in the curve is the reflection coefficient, the abscissa is the frequency, wherein the bandwidth of the-10 dB reflection coefficient is the receivable frequency range, and the range is 3.1-10.6GHz, which meets the UWB receiving frequency range requirement. The reflection coefficient of the antenna is steeper in the upper and lower side bands, and the antenna has better frequency selection characteristic; the out-of-band reflection coefficient is flat, and the out-of-band rejection is better.
Fig. 3-6 are polar coordinate directional diagrams of the E-plane and H-plane of the ultra-wideband antenna of the present invention respectively at 4GHz and 5GHz frequency bands, wherein fig. 3 shows a 4GHz E-plane polar sitting directional diagram, fig. 4 shows a 4GHz H-plane polar sitting directional diagram, fig. 5 shows a 5GHz E-plane polar sitting directional diagram, and fig. 6 shows a 5GHz H-plane polar sitting directional diagram. From the two directional diagrams of the E surface and the H surface in the frequency bands of 4GHz and 5GHz, the antenna has good omnidirectional radiation characteristics, namely no directivity and a good receiving range.

Claims (1)

1. The utility model provides an ultra wide band slot antenna with filtering capability which characterized in that: the antenna comprises a dielectric plate, wherein a step feed microstrip line (1) is arranged on the top surface of the dielectric plate along the central line, an opening slot (3) is arranged in an antenna back plate (2), and the position of the opening slot (3) is coupled with the step feed microstrip line (1); in the antenna back plate (2), a narrow-band slot (4) is arranged close to the opening slot (3);
the step feed microstrip line (1) adopts a feed microstrip line structure with high and low impedance;
in the step feed microstrip line (1), the length of the step microstrip line is L respectively4＝2mm，L6＝1.6mm，L82 mm; the distances between the step microstrip lines are L respectively5＝0.7mm，L7＝2.4mm，L92 mm; the width of the connecting step microstrip line is W30.4 mm; rectangular width W of terminal of step microstrip line62mm, length L3＝5.4mm；
The opening length L of the opening slot (3) in the antenna back plate (2)24.2mm, gap length L108.1mm, width W1The distance between the opening slot (3) and the feed port is L which is equal to 0.5mm1＝15mm；
The length L of the narrow band slot (4) in the antenna back plate (2)118.5mm, width W2＝0.5mm。
CN201810272337.6A 2018-03-29 2018-03-29 Ultra-wideband slot antenna with filtering function Active CN108539356B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112736442A (en) * 2020-12-24 2021-04-30 西安邮电大学 Filtering slot antenna with directional characteristic

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101267061A (en) * 2008-04-25 2008-09-17 华南理工大学 A micro belt aperture shaping wave bundle antenna with serial ladder impedance line feedback
CN104091982A (en) * 2014-06-25 2014-10-08 华南理工大学 Ultra wide band rejection filter based on loading of multiple step impedance resonators
CN105703074A (en) * 2016-04-08 2016-06-22 东南大学 Gate slot ground coaxial feed capacitor loaded phase step impedance tri-polarization half-groove antenna

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101267061A (en) * 2008-04-25 2008-09-17 华南理工大学 A micro belt aperture shaping wave bundle antenna with serial ladder impedance line feedback
CN104091982A (en) * 2014-06-25 2014-10-08 华南理工大学 Ultra wide band rejection filter based on loading of multiple step impedance resonators
CN105703074A (en) * 2016-04-08 2016-06-22 东南大学 Gate slot ground coaxial feed capacitor loaded phase step impedance tri-polarization half-groove antenna

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"a technique of bandwidth enhancement for the slot antenna";Chien-Jen Wang et al;《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》;20081031;第56卷(第10期);第3321-3324页 *
"Compact Band-Rejected Ultrawideband Slot Antennas Inserting With and Resonators";Zhi-An Zheng et al;《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》;20110228;第59卷(第2期);第390-397页 *

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