A low profile miniaturized PIFA antenna for 5G dual-band coverage

Abstract

The application belongs to the technical field of microwave communication and specifically relates to a low-profile miniaturized PIFA antenna for 5G dual-band coverage. The application comprises a parasitic metal patch, a substrate and a metal ground arranged in a top-down stack; a pair of first short-circuit metal columns are arranged at the edge of the parasitic metal patch; a pair of second short-circuit metal columns and a coaxial feed are arranged on the surface of the parasitic metal patch; a main metal radiation patch is arranged on the surface of the parasitic metal patch; metal through holes are arranged in an array on the surface of the main metal radiation patch; a first rectangular groove is etched on the surface of the main metal radiation patch close to the metal through holes; a pair of second rectangular grooves are etched on the surface of the main metal radiation patch; the coaxial feed is located between the pair of second rectangular grooves and the pair of second short-circuit metal columns; a radio frequency excitation signal is fed from the bottom, the main metal radiation patch located thereon is fed by a feed probe, and the parasitic metal patch is fed by inductive coupling through the metal through holes.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of microwave communication, and particularly relates to a low-profile miniaturized PIFA antenna for 5G dual-band coverage. BACKGROUND

[0002] In order to meet the demand of spectrum resources for the characteristics of high speed, low delay and large connection of 5G network, further improve the competitiveness of China in the field of 5G, n78 and n79 frequency bands are determined to be preferentially deployed in the 5G frequency band. The n78 frequency band is the 5G main frequency band of China Telecom and China Unicom, and the frequency band range is 3.3GHz-3.8GHz. The n79 frequency band is the 5G main frequency band of China Mobile, and the frequency band range is 4.4GHz-5GHz. At present, the microwave dual-band antennas proposed by the industry are mainly divided into two categories and have limitations: the first kind is to realize dual-band coverage by exciting double / multiple working modes in a single resonator, but due to the use of higher modes of a single resonator, the antenna size is often too large; the second method is to realize dual-band coverage by using a mixed structure of multiple resonators, but the existing design structure is often complex, and the number of modes provided is still limited (≦4 modes), which is difficult to realize wideband coverage of two frequency bands. Under this background, in terms of antenna technology, it is of great significance to design a dual-band dual-wideband miniaturized antenna covering n78 / n79.

[0003] Microstrip patch antennas (MPA) have been widely used in modern mobile and wireless communication systems due to their low cost and light weight. Compared with traditional MPA, planar inverted-F antennas (PIFA) usually have smaller size, so they become very attractive.

[0004] The microwave dual-band antennas proposed at present are mainly divided into two categories and have limitations: the first kind is to realize dual-band coverage by exciting double / multiple working modes in a single resonator, but due to the use of higher modes of a single resonator, the antenna size is often too large; the second method is to realize dual-band coverage by using a mixed structure of multiple resonators, but the existing design structure is often complex, and the number of modes provided is still limited (≦4 modes), which is difficult to realize wideband coverage of two frequency bands. SUMMARY

[0005] The present application aims at the above-mentioned existing technology of the existing traditional dual-band microstrip patch antenna technology, which realizes dual-band design and often leads to a large planar size (≥0.5x0.5λ1 2This invention addresses issues such as high profile height (≥0.2λ1) and narrow bandwidth (≤5%). It proposes a low-profile, miniaturized PIFA antenna for 5G dual-band coverage.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A low-profile miniaturized PIFA antenna for 5G dual-band coverage includes a parasitic metal patch, a substrate, and a metal ground layer stacked from top to bottom. A pair of first short-circuited metal pillars are disposed along the edge of the parasitic metal patch. A pair of second short-circuited metal pillars and coaxial feed are disposed on the surface of the parasitic metal patch. A main metal radiating patch is disposed on the surface of the parasitic metal patch. Metal vias are arrayed on the surface of the main metal radiating patch. A first rectangular groove is etched on the surface of the main metal radiating patch near the metal vias. A pair of second rectangular grooves are etched on the surface of the main metal radiating patch. The coaxial feed is located between the pair of second rectangular grooves and the pair of second short-circuited metal pillars. An RF excitation signal is fed in from the bottom, feeds the main metal radiating patch located thereon through a feed probe, and feeds the parasitic metal patch through inductive coupling via the metal vias.

[0008] Furthermore, as a preferred embodiment of the present invention, the main metal radiating patch of the antenna provides three modes, namely TM 1 / 2,2 TM 3 / 2,0 and TM 3 / 2,2 A pair of second rectangular grooves are etched on the surface of the main metal radiating patch to reduce TM 3 / 2,0 The mode resonant frequency, and its relationship with TM 1 / 2,2 By merging the modes, broadband coverage with 3.5GHz as the center frequency is achieved, initially covering the n78 frequency band.

[0009] As a further preferred embodiment of the present invention, a first rectangular groove is etched on the surface of the main metal radiating patch to hold the TM 3 / 2,2 After tuning the mode's resonant point to the n79 frequency band, a parasitic metal patch was introduced, which magnetically excited two additional modes TM. 1 / 2,0 and TM 0,2 .

[0010] As a further preferred embodiment of the present invention, a pair of first short-circuit metal pillars are provided on the edge of the parasitic metal patch to improve TM. 1 / 2,0 Mode resonant frequency up to TM 3 / 2,2 Near the mode resonance point, at this time TM 1 / 2,0 TM 3 / 2,2 and TM 0,2 The three modes are similar and initially cover the n79 frequency band.

[0011] As a further preferred embodiment of the present invention, a pair of second short-circuit metal pillars are loaded on the main metal radiating patch to improve impedance matching.

[0012] The low-profile miniaturized PIFA antenna for 5G dual-band coverage described in this invention has the following technical advantages compared with existing technologies:

[0013] (1) This invention introduces a parasitic patch PIFA antenna, which can have two resonant points in the first frequency band and three resonant points in the second frequency band, achieving full coverage of the n78 and n79 dual-band frequencies of 3.25GHz-3.8GHz and 4.39GHz-5.0GHz. This invention uses a PIFA antenna, thus exhibiting a low profile height; the overall antenna height is only 2.54mm (~0.03λ1@3.5GHz); the structure is compact, requiring only a small unit planar size, which is 0.45λ1×0.32λ1 (~λ1@3.5GHz).

[0014] (2) The PIFA antenna structure used in this invention provides five resonant modes, among which the TM provided by the main radiating patch 1 / 2,2 and TM 3 / 2,0 Achieving full coverage of the n78 band, the parasitic patch provides TM 1 / 2,0 TM 0,2 and the TM provided by the main radiating patch 3 / 2,2 It has achieved full coverage of the n79 frequency band.

[0015] (3) This antenna design can simultaneously include two frequency bands, n78 (3.25GHz-3.8GHz) and n79 (4.39GHz-5.0GHz), but is not limited to the n78 and n79 frequency bands. This design technology can be applied to other 5G frequency bands. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the antenna structure according to an embodiment of the present invention;

[0017] Figure 2 The antenna element of this embodiment of the invention is |S 11 | and a schematic diagram of the gain simulation results;

[0018] Figure 3 This is a simulated radiation pattern of the antenna element in an embodiment of the present invention at 3.52 GHz;

[0019] Figure 4 This is a simulated radiation pattern of the antenna element in an embodiment of the present invention at 4.86 GHz;

[0020] In the attached diagram, 1 is the substrate; 2 is the first short-circuit metal pillar; 3 is the parasitic metal patch; 4 is the metal via; 5 is the main metal radiating patch; 6 is the first rectangular slot; 7 is the second rectangular slot; 8 is the second short-circuit metal pillar; 9 is the coaxial feed; and 10 is the metal ground. Detailed Implementation

[0021] The present invention will be further explained in detail below with reference to the accompanying drawings, so that those skilled in the art can better understand and implement the present invention. However, the following examples are only used to explain the present invention and are not intended to limit the present invention.

[0022] like Figure 1 As shown, a low-profile miniaturized PIFA antenna for 5G dual-band coverage includes a parasitic metal patch 3, a substrate 1, and a metal ground 10 stacked from top to bottom. A pair of first short-circuit metal pillars 2 are disposed at the edge of the parasitic metal patch 3. A pair of second short-circuit metal pillars 8 and a coaxial feed 9 are disposed on the surface of the parasitic metal patch 3. A main metal radiating patch 5 is disposed on the surface of the parasitic metal patch 3. Metal vias 4 are arrayed on the surface of the main metal radiating patch 5. A first rectangular groove 6 is etched on the surface of the main metal radiating patch 5 near the metal vias 4. A pair of second rectangular grooves 7 are etched on the surface of the main metal radiating patch 5. The coaxial feed 9 is located between the pair of second rectangular grooves 7 and the pair of second short-circuit metal pillars 8. The radio frequency excitation signal is fed in from the bottom, feeds the main metal radiating patch 5 located thereon through the feed probe, and feeds the parasitic metal patch 3 through the metal vias 4 via inductive coupling.

[0023] The metal ground 10 and above are the dual-band PIFA antenna proposed in this invention. In this structure, the main metal radiating patch 5 of the PIFA antenna provides three modes, namely TM 1 / 2,2 (Main), TM 3 / 2,0 (Main) and TM 3 / 2,2 (Main). A pair of second rectangular grooves 7 are etched on the main metal radiating patch 5 to reduce TM. 3 / 2,0 (Main) mode resonant frequency, and its relationship with TM 1 / 2,2 The (main) mode is merged to achieve broadband coverage with 3.5GHz as the center frequency, initially covering the n78 band. A first rectangular groove 6 is etched on the main metal radiating patch 5 to hold the TM... 3 / 2,2 The resonant point of the (main) mode was tuned to the n79 frequency band. Then, a parasitic metal patch 3 was introduced, and two additional modes TM were excited through magnetic coupling. 1 / 2,0 (Send) and TM 0,2 (Additional). A first short-circuit metal post 2 is added to the edge of the parasitic metal patch 3 to improve TM. 1 / 2,0 (Send) Mode Resonance Frequency to TM 3 / 2,2 Near the (primary) mode resonance point, at this time TM 1 / 2,0(Send), TM 3 / 2,2 (Main) and TM 0,2 (Sent) The three modes are similar, initially covering the n79 frequency band. Finally, a second short-circuit metal pillar 8 is loaded on the main metal radiating patch 5 to improve impedance matching, thereby achieving 5G dual-band broadband operation.

[0024] This invention provides two modes in the 3.25GHz-3.8GHz frequency band and three resonant modes in the 4.29GHz-5.0GHz frequency band, achieving full coverage of 5G dual-band. The overall design achieves a low profile, with the overall profile height of the antenna being only 2.54mm (~0.03λ1@3.5GHz). The planar dimensions of the radiating element designed in this invention are 0.45λ1×0.32λ1 (~λ1@3.5GHz).

[0025] In practical implementation, this invention is a low-profile miniaturized PIFA antenna for 5G dual-band coverage, and the simulation software used is HFSS. In this case, the substrate 1 has a dielectric constant of 6.16 and a loss angle of 0.0027; the overall profile height is 0.03λ1 (~λ13.5GHz), and the planar dimensions are 0.45λ1×0.32λ1 (~λ1@3.5GHz).

[0026] The transmission response of the antenna element is as follows Figure 2 As shown, with |S 11 With a standard of ≤-6dB, the impedance bandwidth ranges are 3.25GHz-3.80GHz (relative bandwidth of 15.6%) and 4.39GHz-5.00GHz (relative bandwidth of 13.0%), which shows that it has achieved full coverage of the 5G dual-band n78 (3.3GHz-3.8GHz) and n79 (4.4GHz-5.0GHz) bands. Figure 3 The simulated radiation pattern of this antenna element at 3.52 GHz is shown. Figure 4 This is the simulated radiation pattern of this antenna element at 4.86 GHz.

[0027] The specific implementation schemes described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific implementation schemes of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A low-profile miniaturized PIFA antenna for 5G dual-band coverage, comprising a parasitic metal patch (3), a substrate (1), and a metal ground (10) stacked from top to bottom; characterized in that, The parasitic metal patch (3) has a pair of first short-circuit metal pillars (2) at its edge; the surface of the parasitic metal patch (3) has a pair of second short-circuit metal pillars (8) and a coaxial feed (9); the surface of the parasitic metal patch (3) has a main metal radiating patch (5); the surface of the main metal radiating patch (5) has an array of metal vias (4); the surface of the main metal radiating patch (5) is etched with a first rectangular groove (6) near the metal vias (4); the surface of the main metal radiating patch (5) is etched with a pair of second rectangular grooves (7); the coaxial feed (9) is located between the pair of second rectangular grooves (7) and the pair of second short-circuit metal pillars (8); the radio frequency excitation signal is fed in from the bottom, feeds the main metal radiating patch (5) located thereon through the feed probe, and feeds the parasitic metal patch (3) through the inductive coupling of the metal vias (4); The main metal radiating patch (5) of the antenna provides three modes, namely TM 1 / 2,2 TM 3 / 2,0 and TM 3 / 2,2 A pair of second rectangular grooves (7) are etched on the surface of the main metal radiating patch (5) to reduce TM 3 / 2,0 The mode resonant frequency, and its relationship with TM 1 / 2,2 By merging the modes, a broadband coverage effect with 3.5GHz as the center frequency is achieved, initially covering the n78 frequency band; The first rectangular groove (6) is etched on the surface of the main metal radiating patch (5), and the TM is then placed therein. 3 / 2,2 After the resonant point of the mode was tuned to the n79 frequency band, a parasitic metal patch (3) was introduced to excite two additional modes TM through magnetic coupling. 1 / 2,0 and TM 0,2 ; A pair of first short-circuit metal pillars (2) are set at the edge of the parasitic metal patch (3) to improve TM 1 / 2,0 Mode resonant frequency up to TM 3 / 2,2 Near the mode resonance point, at this time TM 1 / 2,0 TM 3 / 2,2 and TM 0,2 The three modes are similar, initially covering the n79 frequency band; A pair of second short-circuit metal pillars (8) are loaded on the main metal radiating patch (5) to improve impedance matching.

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