CN109193147B - Low-profile filtering antenna adopting grooved dielectric patch - Google Patents

Low-profile filtering antenna adopting grooved dielectric patch Download PDF

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Publication number
CN109193147B
CN109193147B CN201811073351.XA CN201811073351A CN109193147B CN 109193147 B CN109193147 B CN 109193147B CN 201811073351 A CN201811073351 A CN 201811073351A CN 109193147 B CN109193147 B CN 109193147B
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dielectric patch
dielectric
patch
antenna
substrate
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CN109193147A (en
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陈建新
王雪颖
唐世昌
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Zhongtian Communication Technology Co.,Ltd.
Zhongtian Broadband Technology Co Ltd
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Nantong University
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    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors

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Abstract

The invention relates to a low-profile filter antenna adopting a grooved dielectric patch, which comprises a metal reflection floor, a substrate and the dielectric patch which are sequentially stacked from bottom to top, wherein a feeder line connected with the dielectric patch is arranged on the upper surface of the substrate and used for direct feeding, a pair of inner wall printed metal grooves are arranged at the connection part of the feeder line and are symmetrical to the connection part of the feeder line at one side of the dielectric patch connected with the feeder line, and the dielectric constant of the dielectric patch is 90. The dielectric patch filter antenna has the advantages of simple structure, easy manufacture, small volume, low profile and the like. Through the silver-coated groove, the miniaturization of the antenna can be realized, a radiation zero point can be introduced into a lower frequency band, and the antenna can obtain good filtering characteristics by combining the radiation zero point brought by a high-order mode of the dielectric patch.

Description

Low-profile filtering antenna adopting grooved dielectric patch
Technical Field
The invention relates to the technical field of wireless communication, in particular to a low-profile dielectric patch filter antenna.
Background
In wireless communication systems, the antenna and the filter are typically designed as two separate components. In this case, their respective matching circuits and additional transmission lines for connecting them are required, which inevitably increases the system size and introduces additional loss and loading effects. To overcome this, in recent years, various filter and antenna co-design methods (also referred to as filter antennas) have been widely developed. The design methods can be mainly classified into three categories. One approach is to design a band pass/band stop filter and an antenna and then combine them together. The second method is a modification of the first method, and the antenna functions as both a radiator and a final-stage resonator of the filter. However, they are all of a cascade design, making the antenna structure complex and bulky, especially in the feed network. To solve the problem of cascade design, some researchers have proposed a third method: some filtering structures are embedded in the antenna radiator to achieve a band pass response of the gain, which means that the antenna radiator itself has filtering capabilities. Therefore, this method is an effective method for reducing the size and loss of the filter antenna. Furthermore, radiators with filtering characteristics are attractive in dual-band arrays to reduce mutual coupling between elements operating at different frequencies.
As is well known, a dielectric resonator antenna, which is a typical antenna, has advantages of small volume, light weight, easy excitation, and the like. Dielectric resonator filter antennas have become a hotspot for high frequency applications in recent years. However, the dielectric resonator filter antenna designed based on the above-described first and second methods has a high profile and a bulky feed structure. In 2013, in order to reduce the profile of a dielectric resonator antenna, a scholarly proposed a high-density dielectric patch antenna whose main mode (lowest-order resonance mode) is TE11Mode, with similar electric field distribution of the microstrip patch.
Through search, the chinese patent application CN 105720364 a discloses a dual-polarized filtering antenna with high selectivity and low cross polarization, which does not need an additional filtering circuit, integrates filtering characteristics and radiation characteristics, and solves the problems of insertion loss and extra size caused by the traditional cascaded filtering antenna. However, the disadvantages are: the structure is complex, and the filtering characteristic is realized on the feed network, but the antenna radiator has the filtering capability.
Disclosure of Invention
The invention aims to: the defects of the prior art are overcome, and the low-profile filter antenna adopting the slotted dielectric patch with a simple structure is provided. The antenna adopts a direct feeding mode to feed the dielectric patch. By means of the non-radiation high-order mode of the dielectric patch and the arrangement of a pair of slots with metal-printed inner walls in the dielectric patch, two radiation zeros at the high end and the low end can be obtained without adding any additional filter circuit, so that the antenna radiator has the filtering capability. Meanwhile, the electrical length of the antenna is changed in the process of slotting the dielectric patch, and the miniaturization of the antenna is realized.
In order to achieve the purpose, the low-profile filtering antenna adopting the grooved dielectric patch comprises a metal reflection floor, a substrate and the dielectric patch which are sequentially stacked from bottom to top, wherein a feeder line connected with the dielectric patch is arranged on the upper surface of the substrate and used for direct feeding, a pair of grooves with metal printed on the inner wall is symmetrically arranged at the connection position of the feeder line and the side, connected with the feeder line, of the dielectric patch, and the dielectric constant of the dielectric patch is larger than 40.
The dielectric patch filter antenna has the advantages of simple structure, easiness in manufacturing, small size, low profile and the like. Through the introduced silver coating groove, the miniaturization of the antenna can be realized, the radiation zero point can be introduced into a lower frequency band, and the antenna can obtain good filtering performance by combining the high-frequency band radiation zero point generated by a high-order mode of the dielectric patch. By changing the length and width of the slot, the operating frequency of the antenna and the position of the radiation zero point are regularly changed at the same time, so that the required frequency can be easily tuned for suppression.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a perspective view of a slotted dielectric patch filter antenna of the present invention.
Fig. 2 is an exploded view of the slotted dielectric patch filter antenna of the present invention.
Fig. 3 is a top view of the slotted dielectric patch filter antenna of the present invention.
FIG. 4 is a graph of simulated reflection coefficient (S) for a slotless dielectric patch antenna11) And a gain profile.
FIG. 5 shows the simulated reflection coefficient (S) of the slot dielectric patch filter antenna of the present invention11) And a gain profile.
FIG. 6 is a graph showing the reflection coefficient (S) of a slot dielectric patch filter antenna simulation and test of the present invention11) And gain curves.
Fig. 7 is a simulated and tested E-plane radiation pattern of the slotted dielectric patch filter antenna of the present invention at the 4.17GHz frequency point.
Fig. 8 is a simulated and tested antenna radiation H-plane pattern for the slotted dielectric patch filter antenna of the present invention at the 4.17GHz frequency point.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1-3, the low-profile filter antenna using the dielectric patch with slots of the present embodiment includes a metal reflective floor 1, a substrate 2 and a dielectric patch 3 stacked in sequence from bottom to top, and a feeder 4 connected to the dielectric patch is disposed on the upper surface of the substrate for direct feeding. In this example, the substrate 2 is a printed circuit board, the metal reflective floor 1 is printed on the bottom surface of the printed circuit board 2, and the feed line 4 is printed on the top surface of the printed circuit board 2. A rectangular metal feed sheet 5 is printed in the middle of one side surface of the dielectric patch, the feed line 4 is connected with the metal feed sheet 5, one side of the dielectric patch 3 connected with the feed line 4 is symmetrically provided with a pair of rectangular grooves 6 with inner walls printed with metal silver in the metal feed sheet 5, the dielectric patch 3 is microwave dielectric ceramic, and the dielectric constant of the dielectric patch 3 is constantr= 90. In the filter antenna with the structure, the dielectric constant of the dielectric patch is required to be larger than 40.
The parameters of the antenna of this embodiment are shown in the following table
Parameter(s) W 1 W 2 L 1 L 2 h 1
Value (mm) 20 44 17 47 1.1
Parameter(s) h 2 l w d t
Value (mm) 0.813 7 0.95 9.8 0.8
W 1Is the width of the media patch,W 2is the width of the substrate and is,L 1is the length of the dielectric patch and,L 2is the length of the substrate and is,h 1is the height of the dielectric patch and,h 2is the height of the substrate and is,lthe length of the groove is taken as the length of the groove,wis the width of the slot or slots and,dis the distance between the two grooves and is,tthe height of the metal feed tab. By varying the length of the groovelAnd widthwThe operating frequency of the antenna and the position of the radiation zero point can be adjusted. By varying the height of the metal feed tabtThe input matching of the antenna can be adjusted.
The dielectric patch is made of high-density ceramic materials and is used for replacing the microstrip metal patch. The primary mode (lowest order resonant mode) of the dielectric patch is TM11Mode, the electric field distribution of which is similar to that of a microstrip patch. FIG. 4 shows the simulated reflection coefficient (S) of a slotless dielectric patch antenna directly fed by a microstrip line11) And a gain. Since the upper surface of the dielectric patch can be approximated by a magnetic wall, the TM11The radiation of the pattern is along two sides of the y-axis direction and the polarization direction is along the x-axis. Lowest-order mode HEM of dielectric patch21Is perpendicular to the feed microstrip line and is therefore not excited (S)110 dB). More importantly, HEM21The mode has no radiating elements in the x-axis polarization direction. Thus, an inherent high-end radiation zero can be obtained in this excitation mode. Simultaneous, higher order mode HEM12Its electric field distribution is parallel to the feed line, can be excited, and works well.
To create another zero point of radiation at the low frequency band to enhance selectivity, this embodiment etches a pair of slots in the dielectric patch in the x-direction and prints silver on three interior surfaces. FIG. 5 is a simulated S11And a gain. As can be seen from FIGS. 4 and 5, the silver-coated slot pulls down the TM11And HEM21The frequency of the mode. Meanwhile, the reversed-phase electric field is vertical to the groove, so that the silver-attached groove can generate another radiation zero point in a low-frequency band. Following the length of the slotlThe operating frequency of the antenna is reduced, and the low-side and high-side radiation zeros are adaptive, with stable high selectivity. At the same time, the width of the groovewMainly affects the low-end radiation zero point and has little effect on the high-end radiation zero point. Therefore, the temperature of the molten metal is controlled,the two zeros can be controlled independently so that the desired frequency can be easily tuned for rejection.
The dielectric patch filter antenna of the embodiment is tested, and the test result is matched with the simulation, which is shown in fig. 6. The antenna has a narrow filtering band at the center frequencyf 0S at = 4.17GHz11<20 dB, two radiation nulls at 4.02 and 4.31 GHz are observed in the measured gain response, the passband edges are steep, and there is high selectivity. The maximum gain measured at 4.17GHz is 4.8 dB. The E and H plane radiation patterns at the 4.17GHz frequency point are shown in fig. 7 and 8. The cross polarization was measured at least 15 dB lower than the main polarization. It can be seen from the figures that slight differences between the simulation and measurement results can be observed, which can be attributed to manufacturing and measurement errors.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (6)

1. A low-profile filter antenna adopting a grooved dielectric patch comprises a metal reflective floor, a substrate and the dielectric patch which are sequentially stacked from bottom to top, wherein a feeder line connected with the dielectric patch is arranged on the upper surface of the substrate and used for direct feeding, a pair of inner wall metal printing grooves are symmetrically formed in the connection position of the feeder line and the side, connected with the feeder line, of the dielectric patch, the dielectric constant of the dielectric patch is larger than 40, the substrate is a printed circuit board, the metal reflective floor is printed on the bottom surface of the printed circuit board, the feeder line is printed on the top surface of the printed circuit board, a metal feed sheet is arranged in the middle of one side surface of the dielectric patch, and the feeder line is connected with the metal feed sheet.
2. The low profile filter antenna using a slotted dielectric patch according to claim 1, wherein: the metal feed sheet is arranged on the side face of the medium patch in a printing mode.
3. The low profile filter antenna using a slotted dielectric patch according to claim 1, wherein: the metal feed sheet is rectangular, the lower bottom edge of the metal feed sheet is flush with the bottom surface of the dielectric patch, and the height t of the metal feed sheet does not exceed the height of the dielectric patch.
4. The low profile filter antenna using a slotted dielectric patch according to claim 3, wherein: the groove is a rectangular groove, and the metal coated on the inner wall of the groove is silver, manganese, copper, tin or nickel.
5. The low profile filter antenna using a slotted dielectric patch according to claim 4, wherein: the dielectric patch is located at the center of the substrate, the width W2=44mm of the substrate, the length L2=47mm of the substrate, the height h2=0.813mm of the substrate, the length L1=17mm of the dielectric patch, the width W1=20mm of the dielectric patch, the height h1=1.1mm of the dielectric patch, the width W =0.95mm of the slot, the length L =7mm of the slot, and the distance d =9.8mm between the two slots.
6. The low profile filter antenna using a slotted dielectric patch according to claim 5, wherein: the dielectric constant of the dielectric patch is 90.
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CN110085991A (en) * 2019-05-13 2019-08-02 南通大学 A kind of circular polarisation low section dielectric patch antenna element and its array
CN111478026B (en) * 2020-04-20 2022-11-22 南通大学 Strip-type dielectric patch filter antenna array
CN112542703A (en) * 2020-11-24 2021-03-23 深圳市信维通信股份有限公司 5G millimeter wave resonator antenna module
CN113394553B (en) * 2021-06-16 2023-03-31 维沃移动通信有限公司 Electronic device
CN114221119A (en) * 2021-12-16 2022-03-22 西安交通大学 Low-profile dielectric antenna
CN115566414B (en) * 2022-11-16 2023-04-07 西安创联电气科技（集团）有限责任公司 Multilayer microwave dielectric ceramic filter antenna and preparation method thereof

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