Multi-frequency miniaturized omnidirectional indoor antenna

Abstract

The embodiment of the present application provides a multi-frequency miniaturized omnidirectional indoor antenna, which belongs to the field of antenna technology. The multi-frequency miniaturized omnidirectional indoor antenna includes a ground plate, a dielectric substrate and a feeder, and the ground plate and the feeder are respectively arranged on two opposite sides of the dielectric substrate; a radiation slot and at least one wave trap slot are opened on the ground plate, and the radiation slot is an annular structure, and the wave trap slot is located outside the radiation slot, and the wave trap slot is an arc-shaped concentric with the radiation slot. The multi-frequency miniaturized omnidirectional indoor antenna provided by the embodiment of the present application solves the problem that the omnidirectional indoor antenna in the prior art is not easy to achieve broadband multi-frequency characteristics, has a high profile, and is complex in design.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a multi-frequency miniaturized omnidirectional indoor antenna. Background Art

[0002] Omnidirectional indoor antennas are widely used in various wireless communication systems because they can transmit and receive electromagnetic waves evenly in 360 degrees.

[0003] In the related art, omnidirectional room-divided antennas usually adopt a suspension line or coaxial probe structure, wherein the suspension line structure refers to suspending the antenna feed line between the upper and lower dielectric substrates. This feeding structure often has the disadvantage of a high cross-section; the coaxial probe structure refers to transmitting the radio frequency signal to the antenna's radiating element through a coaxial cable. This excitation method is not easy to achieve array expansion composed of multiple antenna units; if an omnidirectional room-divided antenna with multi-frequency characteristics is used, a single multi-resonance method is usually used for production, that is, by introducing multiple resonance points to form multiple working frequency bands, but in this case each working bandwidth is narrow, and the introduction of resonance points easily increases the complexity of the structure and design.

[0004] Therefore, the above-mentioned omnidirectional indoor antenna has the problem of a single multi-frequency implementation method and a narrow working bandwidth in the working frequency band, which makes it difficult to meet the relevant indicator requirements of some specific systems. Summary of the invention

[0005] The embodiment of the present application provides a multi-frequency miniaturized omnidirectional room-based antenna to solve the problem in the prior art that omnidirectional room-based antennas are difficult to achieve broadband multi-frequency characteristics, have a high profile, and are complex in design.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] An embodiment of the present application provides a multi-frequency miniaturized omnidirectional indoor antenna, comprising a ground plate, a dielectric substrate and a feeder, wherein the ground plate and the feeder are respectively arranged on two opposite surfaces of the dielectric substrate; a radiation slot and at least one wave trap slot are opened on the ground plate, wherein the radiation slot is in an annular structure, the wave trap slot is located outside the radiation slot, and the wave trap slot is in the shape of an arc concentric with the radiation slot.

[0008] In a possible implementation manner, a plurality of the notch slots are provided, and the notch slots are distributed at intervals.

[0009] In a possible implementation manner, the wave trap slots are distributed at intervals along the radial direction of the radiation slot.

[0010] In a possible implementation manner, the notch gaps are set to have different lengths.

[0011] In a possible implementation manner, the position of the wave trap slot is opposite to the position of the feeding element.

[0012] In a possible implementation manner, an edge of the ground plate is flush with an edge of the dielectric substrate.

[0013] In a possible implementation, the feeding element includes a microstrip feeding line, one end of which is a feeding port; the other end of the microstrip feeding line is provided with a feeding matching part, the microstrip feeding line is arranged on the dielectric substrate, and one end of the microstrip feeding line is also connected to the dielectric substrate through the feeding matching part.

[0014] In a possible implementation manner, the feeding port is flush with an edge of the dielectric substrate, and the feeding matching portion at least extends to a center position of the dielectric substrate.

[0015] In a possible implementation manner, an extension direction of the feed matching portion is consistent with an extension direction of the microstrip feed line, and a width of the feed matching portion is greater than a width of the microstrip feed line.

[0016] In a possible implementation manner, a projection of the microstrip feeding line on the ground plane is in the same straight line as an axis of symmetry of the notch slot.

[0017] The embodiment of the present application provides a multi-frequency miniaturized omnidirectional indoor antenna, which is provided by setting a ground plate, a dielectric substrate and a feeder, wherein the ground plate and the feeder are respectively provided on two opposite sides of the dielectric substrate; a radiation slot and at least one wave trap slot are provided on the ground plate, the radiation slot is annular in structure, the wave trap slot is located outside the radiation slot, and the wave trap slot is an arc-shaped concentric with the radiation slot. Thus, when in use, the excitation current flows into and propagates from the feeder, and the electromagnetic energy on the feeder is coupled to the ground plate via the dielectric substrate, and then the annular radiation slot realizes omnidirectional radiation within a wide frequency range, and on this basis, a miniaturized and easily integrated wave trap slot is provided to realize the multi-frequency functional characteristics of a wide working bandwidth, and at the same time, it has the advantages of easy adjustment of the frequency band and stopband spacing, low overall profile, easy integration, low cost, and low design complexity, which solves the problem that the omnidirectional indoor antenna in the prior art is not easy to realize broadband multi-frequency characteristics, has a high profile, and has a complex design. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments that conform to the present application, and together with the specification, are used to explain the principles of the present application.

[0019] Figure 1 A schematic diagram of the structure of a multi-frequency miniaturized omnidirectional indoor antenna provided in Example 1 of the present application;

[0020] Figure 2 for Figure 1 Schematic diagram of the installation structure of the middle feeder;

[0021] Figure 3 A simulation curve diagram of the reflection coefficient and actual gain of the multi-frequency miniaturized omnidirectional indoor antenna provided in Example 1 of the present application;

[0022] Figure 4 The simulated radiation patterns of the main polarizations in the horizontal and vertical planes of the multi-frequency miniaturized omnidirectional indoor antenna provided in Example 1 of the present application at a frequency of 2 GHz.

[0023] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.

[0024] Description of reference numerals:

[0025] 100- ground plate;

[0026] 200- dielectric substrate;

[0027] 300-feeder;

[0028] 310-microstrip feeder;

[0029] 320-feed matching section;

[0030] 400-radiation gap;

[0031] 500-notch gap;

[0032] 600-notch gap one;

[0033] 700-notch gap two. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application and how the technical solutions in the present application solve the above-mentioned technical problems will be clearly and completely described below with specific embodiments and in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0036] In the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0037] In the related art, omnidirectional room-divided antennas usually adopt a suspension line or coaxial probe structure, wherein the suspension line structure refers to suspending the antenna feed line between the upper and lower dielectric substrates. This feeding structure often has the disadvantage of a high cross-section; the coaxial probe structure refers to transmitting the radio frequency signal to the antenna's radiating element through a coaxial cable. This excitation method is not easy to achieve array expansion composed of multiple antenna units; if an omnidirectional room-divided antenna with multi-frequency characteristics is used, a single multi-resonance method is usually used for production, that is, by introducing multiple resonance points to form multiple working frequency bands, but in this case each working bandwidth is narrow, and the introduction of resonance points easily increases the complexity of the structure and design.

[0038] Therefore, the above-mentioned omnidirectional indoor antenna has the problem of a single multi-frequency implementation method and a narrow working bandwidth in the working frequency band, which makes it difficult to meet the relevant indicator requirements of some specific systems.

[0039] Therefore, the embodiment of the present application provides a multi-frequency miniaturized omnidirectional indoor antenna, which is provided with a ground plate, a dielectric substrate and a feeding element, and a radiation slot and at least one trap slot are provided on the ground plate, the radiation slot is annular in structure, the trap slot is located outside the radiation slot, and the trap slot is an arc-shaped concentric with the radiation slot; therefore, when in use, the excitation current flows into and propagates from the feeding element, and the electromagnetic energy on the feeding element is coupled to the ground plate via the dielectric substrate, and then the annular radiation slot realizes omnidirectional radiation within a wide frequency range, and on this basis, a miniaturized and easily integrated trap slot is provided to realize multi-frequency functional characteristics with a wide working bandwidth, and at the same time has the advantages of easy adjustment of the number of frequency bands and the stopband spacing, easy overall integration, low cost, and low design complexity, which solves the problems in the prior art that the omnidirectional indoor antenna is difficult to realize broadband multi-frequency characteristics, has a high profile, and has a complex design.

[0040] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0041] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a multi-frequency miniaturized omnidirectional indoor antenna including a ground plate 100, a dielectric substrate 200 and a feeder 300, wherein the ground plate 100 and the feeder 300 are respectively arranged on two opposite surfaces of the dielectric substrate 200; a radiation slot 400 and at least one trap slot 500 are provided on the ground plate 100, wherein the radiation slot 400 is in an annular structure, and the trap slot 500 is located outside the radiation slot 400, and the trap slot 500 is in an arc shape concentric with the radiation slot 400.

[0042] Specifically, the ground plate 100 is attached to the upper surface of the dielectric substrate 200, and the feeding element 300 is attached to the surface of the dielectric substrate 200. The ground plate 100 is made of a material with good electrical conductivity, such as copper or aluminum.

[0043] The dielectric substrate 200 may be a RT / duroid 5880 substrate having a dielectric constant of 2.2 and a loss tangent of 0.0009, and may also be other plates having different dielectric constants.

[0044] The feeding element 300 is used to be connected to an external circuit or device so that the entire antenna is connected to the external circuit.

[0045] The radiation slot 400 and the notch slot 500 can be formed on the ground plate 100 by etching. Of course, the radiation slot 400 and the notch slot 500 can also be set on the ground plate 100 in other ways, such as cutting and stamping. The radiation slot 400 is in a wide ring shape, and the notch slot 500 is located outside the radiation slot 400, so that the impedance mismatch between the notch slot 500 and the radiation slot 400. Therefore, the transmission zero point, that is, the notch point, is introduced in the wide impedance bandwidth range through the notch slot 500, thereby having a certain filtering effect, and dividing the broadband bandwidth into multiple frequency bands.

[0046] When in use, the antenna is connected to the external circuit through the feed 300, the excitation current flows into and propagates from the feed 300, and the electromagnetic energy on the feed 300 is coupled to the ground plate 100 via the dielectric substrate 200, and then the annular radiation gap 400 realizes omnidirectional radiation within a wide frequency range, and on this basis, a miniaturized and easily integrated notch gap 500 is set to realize multi-frequency functional characteristics with a wide working bandwidth. At the same time, it has the advantages of easy adjustment of the number of frequency bands and stopband spacing, low overall profile, easy integration, low cost, and low design complexity, which solves the problem that the omnidirectional room antenna in the prior art is not easy to realize broadband multi-frequency characteristics, has a high profile, and has a complex design.

[0047] It should be noted that the edge of the ground plate 100 is flush with the edge of the dielectric substrate 200 .

[0048] Thereby, the overall planar size of the antenna can be reduced.

[0049] In the embodiment of the present application, the length, width and height of the dielectric substrate 200 can be set to 45 mm, 45 mm and 3.175 mm respectively. The length and width of the ground plate 100 can be equal to the length and width of the dielectric substrate 200 respectively.

[0050] Of course, in actual implementation, the dielectric substrate 200 and the grounding plate 100 can also be set to other sizes according to actual needs, and it is only necessary for the dielectric substrate 200 to at least cover the radiation part on the grounding plate 100. Preferably, the length and width of the two are kept consistent. Therefore, during use, the utilization rate of the dielectric substrate 200 or the grounding plate 100 can be ensured, the possibility of redundant parts is reduced, and the waste of materials is reduced.

[0051] like Figure 1 As shown, in some embodiments, a plurality of notch slots 500 are provided, and the notch slots 500 are distributed at intervals.

[0052] Preferably, the wave trap slots 500 are distributed at intervals along the radial direction of the radiation slot 400 .

[0053] In the embodiment of the present application, two notch slots 500 are provided, and they are arc-shaped notch slot one 600 and notch slot two 700, and the notch slot one 600 and notch slot two 700 are spaced apart from each other.

[0054] It should be noted that the notch slot 1 600 and the notch slot 2 700 may be distributed on the same side or different sides of the radiation slot 400. In this embodiment, the notch slot 1 600 and the notch slot 2 700 are distributed on the same side of the radiation slot 400, and the notch slot 1 600 and the notch slot 2 700 are distributed at intervals along the radial direction of the radiation slot 400, and the notch slot 1 600 is located on the side of the notch slot 2 700 away from the radiation slot 400.

[0055] When in use, the notch slot 1 600 and the notch slot 2 700 set in this manner can produce an obvious notch effect at a specific frequency, effectively suppressing unnecessary frequency band signals, thereby improving the isolation of the antenna when working in different frequency bands; it can maintain the symmetry of the antenna's radiation pattern and achieve the expected radiation characteristics, thereby facilitating the realization of the antenna's omnidirectional radiation.

[0056] In other embodiments, the number of the notch slots 500 may be reasonably set according to actual needs, such as four or other numbers.

[0057] Furthermore, the position of the notch slot 500 is opposite to the position of the feeding element 300 .

[0058] It can be understood that the first notch slot 600 and the second notch slot 700 are both opposite to the feeder 300, that is, the first notch slot 600 and the second notch slot 700 are both located directly above the feeder 300. Therefore, during operation, the notch stopband performance is more obvious.

[0059] like Figure 1 As shown, in some embodiments, each notch slot 500 is set to have different lengths.

[0060] In the embodiment of the present application, the first notch gap 600 and the second notch gap 700 are set to different lengths.

[0061] It can be understood that while ensuring a better notch effect and the symmetry of the antenna's radiation pattern, the length of the notch slot 500 is reasonably set to ensure the antenna's use effect.

[0062] In the embodiment of the present application, the radiation gap 400 can be set as a circular closed loop with an outer edge radius of 21 mm and a ring width of 8.5 mm. In actual implementation, the radiation gap 400 can be set to different sizes according to different operating frequencies. The higher the frequency, the smaller the size. Therefore, the diameter and width of the radiation gap 400 can be reasonably set according to actual needs, and there is no limitation on this.

[0063] At the same time, the notch gap 1 600 and the notch gap 2 700 can be arc gaps with arc angles of 90° and 116°, and the width can be 0.5 mm. In actual implementation, the notch gap 1 600 and the notch gap 2 700 can be set to different sizes according to different operating frequencies. The higher the frequency, the smaller the size. Therefore, the sizes of the notch gap 1 600 and the notch gap 2 700 can be reasonably set according to actual needs.

[0064] like Figure 1 and Figure 2 As shown, in some embodiments, the feeding element 300 includes a microstrip feeding line 310, one end of the microstrip feeding line 310 is a feeding port; the other end of the microstrip feeding line 310 is provided with a feeding matching part 320, the microstrip feeding line 310 is arranged on the dielectric substrate 200, and one end of the microstrip feeding line 310 is also connected to the dielectric substrate 200 through the feeding matching part 320.

[0065] In the embodiment of the present application, the microstrip feed line 310 and the feed matching part 320 are both attached to the lower surface of the dielectric substrate 200, and the feed matching part 320 is connected to one end of the microstrip feed line 310. One end of the microstrip feed line 310 away from the feed matching part 320 is a feed port, so that the microstrip feed line 310 can be connected to an external circuit through one end of the feed port, so that the antenna and the circuit are connected to each other.

[0066] In actual implementation, the microstrip feeding line 310 and the feeding matching part 320 can be formed in one piece. Of course, the two can also be connected to each other by welding.

[0067] When in use, the current will pass through the microstrip feed line 310 from the feed port, and then be transmitted to the dielectric substrate 200 through the feed matching part 320, and finally to the ground plate 100. The feed matching part 320 can improve the impedance matching effect between the microstrip feed line 310 and the dielectric substrate 200.

[0068] In other embodiments, the feeding element 300 may also be configured as a feeding probe connected to the dielectric substrate 200 .

[0069] like Figure 2 As shown, in some embodiments, the feeding port is flush with the edge of the dielectric substrate 200 , and the feeding matching portion 320 extends at least to the center of the dielectric substrate 200 .

[0070] Specifically, one end of the microstrip feed line 310 configured as a feeding port is located at the edge of the dielectric substrate 200 , and one end of the microstrip feed line 310 configured with a feeding matching portion 320 extends toward the center of the dielectric substrate 200 , and the feeding matching portion 320 also extends toward the center of the dielectric substrate 200 .

[0071] Thus, it is ensured that the current passing through the microstrip feed line 310 can be effectively transmitted in the center of the dielectric substrate 200 through the feed matching part 320. In addition, the impedance matching of the antenna can be better controlled and adjusted, which helps to reduce reflection loss and improve the efficiency and performance of the antenna; the current distribution of the antenna can also be optimized, thereby enhancing the radiation characteristics of the antenna.

[0072] like Figure 2 As shown, further, the extension direction of the feed matching portion 320 is consistent with the extension direction of the microstrip feeding line 310 , and the width of the feed matching portion 320 is greater than the width of the microstrip feeding line 310 .

[0073] In the embodiment of the present application, for example, the length of the microstrip feed line 310 can be set to 10 mm and the width can be set to 3.6 mm. The length of the feed matching part 320 can be set to 21 mm and the width can be set to 7 mm. It should be noted that the total length of the microstrip feed line 310 and the feed matching part 320 is not less than half the length of the dielectric substrate 200, that is, it is sufficient to ensure that the feed matching part 320 can extend to the center of the dielectric substrate 200, and no other restrictions are imposed on this.

[0074] Therefore, by making the width of the feed matching portion 320 larger than the width of the microstrip feed line 310, the impedance matching effect between the microstrip feed line 310 and the dielectric substrate 200 can be further improved, and the bandwidth of the antenna can be increased to achieve a wider frequency range, thereby allowing the antenna to maintain efficient operation in a wider frequency band.

[0075] In other embodiments, in actual implementation, the length and width of the microstrip feed line 310 and the feed matching portion 320 can be adjusted according to different input impedances; wherein the width of the feed matching portion 320 and the width of the microstrip feed line 310 can be freely combined under different matching conditions.

[0076] like Figure 1 and Figure 2 As shown, further, the projection of the microstrip feeding line 310 on the ground plane 100 is on the same straight line as the symmetry axis of the notch slot 500 .

[0077] Specifically, the projection of the microstrip feed line 310 on the ground plane 100 can be located at the center of the notch slot 1 600 and the notch slot 2 700. Thus, during operation, the radiation pattern is more symmetrical, which helps to achieve the expected radiation characteristics.

[0078] For example, Figure 3As shown, the curve in the figure includes three working frequency bands, and the -10dB band bandwidths are 39% (1.7G-2.5G), 6.5% (2.84G-3.03G) and 11% (3.6G-4G), respectively, which can be adjusted by size adjustment and other methods to cover the specific frequency band range of mobile communications. Among them, gain values ​​of 2.7dBi, 4.1dBi and 5.4dBi can be achieved in 2G, 2.9G and 3.8G respectively, and a 3dB gain bandwidth not less than the impedance bandwidth can be obtained in the three frequency bands.

[0079] It can be seen that the actual working frequency band range and stop band range of the embodiment of the present application can be optimized and adjusted according to specific indicators to meet the frequency coverage requirements of mobile communications; the antenna gain variation curve with frequency conforms to objective laws, and a parallel fed array antenna can be constructed based on this embodiment to further improve the gain value.

[0080] In addition, as shown in Figure 4, in the main polarization simulation radiation patterns of the horizontal and vertical planes at the 2 GHz frequency point in the first selected frequency band, it can be seen that the antenna has good omnidirectionality in the horizontal plane.

[0081] In summary, the embodiment of the present application provides a multi-frequency miniaturized omnidirectional indoor antenna. When in use, the antenna is connected to the external circuit through the feed 300, and the excitation current flows into and propagates from the feed 300. The electromagnetic energy on the feed 300 is coupled to the ground plate 100 via the dielectric substrate 200, and then the annular radiation gap 400 realizes omnidirectional radiation within a wide frequency range. On this basis, a miniaturized and easily integrated notch gap 500 is provided to realize multi-frequency functional characteristics with a wide working bandwidth. At the same time, it has the advantages of easy adjustment of the number of frequency bands and the spacing between stop bands, low overall profile, easy integration, low cost, and low design complexity, which solves the problem that the omnidirectional indoor antenna in the prior art is difficult to realize broadband multi-frequency characteristics, has a high profile, and has a complex design.

[0082] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments, and the above embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0083] Those skilled in the art will readily appreciate other embodiments of the present application after considering the description and practicing the contents disclosed herein. The present application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application. The description and embodiments are only considered as exemplary, and the scope of the present application is limited only by the appended claims.

Claims

1. A multi-frequency miniaturized omnidirectional indoor antenna, characterized in that: It comprises a grounding plate (100), a dielectric substrate (200) and a feeding element (300), wherein the grounding plate (100) and the feeding element (300) are respectively and correspondingly arranged on two opposite surfaces of the dielectric substrate (200); The ground plate (100) is provided with a radiation slot (400) and at least one wave trap slot (500), the radiation slot (400) is in a circular ring structure, the wave trap slot (500) is located outside the radiation slot (400), and the wave trap slot (500) is in an arc shape that is concentric with the radiation slot (400); A plurality of the wave trap gaps (500) are provided, and the wave trap gaps (500) are distributed at intervals; The wave trap slots (500) are distributed on the same side of the radiation slot (400) and are spaced apart along the radial direction of the radiation slot (400); The position of the wave trap gap (500) is opposite to the position of the feeding element (300); The feeding element (300) comprises a microstrip feeding line (310); The projection of the microstrip feeding line (310) on the ground plane (100) is on the same straight line as the symmetry axis of the wave trap slot (500).

2. The multi-frequency miniaturized omnidirectional indoor antenna according to claim 1, characterized in that: Each of the wave trap gaps (500) is set to have a different length.

3. The multi-frequency miniaturized omnidirectional indoor antenna according to claim 1 or 2, characterized in that: The edge of the ground plate (100) is flush with the edge of the dielectric substrate (200).

4. The multi-frequency miniaturized omnidirectional indoor antenna according to claim 1 or 2, characterized in that: One end of the microstrip feed line (310) is a feed port; the other end of the microstrip feed line (310) is provided with a feed matching portion (320); the microstrip feed line (310) is arranged on the dielectric substrate (200), and one end of the microstrip feed line (310) is also connected to the dielectric substrate (200) via the feed matching portion (320).

5. The multi-frequency miniaturized omnidirectional indoor antenna according to claim 4, characterized in that: The feeding port is flush with the edge of the dielectric substrate (200), and the feeding matching portion (320) extends at least to the center position of the dielectric substrate (200).

6. The multi-frequency miniaturized omnidirectional indoor antenna according to claim 5, characterized in that: The extension direction of the feed matching portion (320) is consistent with the extension direction of the microstrip feed line (310), and the width of the feed matching portion (320) is greater than the width of the microstrip feed line (310).

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