CN209929493U - Filtering power division and phase shift integrated antenna array feed network - Google Patents

Abstract

The utility model discloses an antenna array feeding network integrated with filtering, power division and phase shifting. A phase-modulating dielectric substrate; the upper and lower metal floors are grounded through metal connecting posts, and the suspension strip line is arranged on the suspended dielectric substrate, and the suspended dielectric substrate is placed horizontally between the two phase-modulating dielectric substrates. between the two phase-modulating dielectric substrates are placed horizontally between the upper and lower metal floors; the suspended stripline includes one-to-three filtering power division units, two one-to-two unequal filtering power division units, and two phase-shifting lines. One and two phase-shifting lines 2, the two phase-modulating dielectric substrates cover a part of the three-filtering power division unit and the two phase-shifting lines 1 and the two phase-shifting lines 2. The utility model integrates the three functional circuits of filtering, power division and phase shifting, and avoids the problem of cascading mismatch between different functional circuits in conventional designs.

Description

An Antenna Array Feeding Network Integrated with Filtering, Power Division and Phase Shifting

technical field

The utility model relates to the field of antenna feeding networks in wireless communication systems, in particular to an antenna array feeding network integrating filtering, power division and phase shifting.

Background technique

The antenna feeding network is usually composed of passive devices such as power dividers, phase shifters, and couplers. It is used in an antenna system with multiple radiating elements to meet the amplitude distribution and phase distribution required for feeding each radiating element. In addition to the feeding network, the antenna also needs to be cascaded with a filter to filter out other unnecessary signals and avoid interference.

In conventional design, devices such as power divider, phase shifter and filter are designed independently, and then the power divider and phase shifter and other devices are cascaded to form a feed network, and then cascaded with the filter. Such an approach will bring about the inevitable cascade mismatch problem, resulting in an increase in the overall circuit insertion loss, deterioration in performance, and a larger circuit volume. In addition, the antenna needs to take into account co-channel interference and optimal coverage. During beamforming, the amplitude distribution and phase distribution of each output of the feeding network need to be optimized and adjusted. Among them, the adjustment of the phase distribution is more important. In order to better meet the antenna beam To shape the phase distribution required by the down-tilt of the ESC, the feed network can flexibly adjust the phase difference of each output signal, which will have better applicability.

Utility model content

In order to overcome the shortcomings and deficiencies of the prior art, the utility model provides an antenna array feeding network with integrated filtering, power division and phase shifting, which avoids the problem of cascading mismatch between circuits with different functions in conventional designs and reduces circuit insertion loss. As well as volume, improve overall performance. In addition, by moving the position of the phase modulation medium substrate, the phase difference of the signals between the output ports can be easily controlled, so as to meet the phase distribution requirements required by the antenna radiation unit.

The purpose of the present utility model can be achieved through the following technical solutions:

An antenna array feeding network integrating filtering, power division and phase shifting, comprising upper and lower metal floors, metal connection posts, coaxial feed ports, a suspended dielectric substrate, a suspended strip line and two phase modulation dielectric substrates ;

The upper and lower metal floors are grounded together by metal connecting posts, the suspension strip line is arranged on a suspension dielectric substrate, and the suspension dielectric substrate is placed horizontally between two phase-modulating dielectric substrates. The phase modulation medium substrate is placed horizontally between the upper and lower metal floors;

The suspended stripline includes a one-to-three filter power division unit, two one-to-two unequal filter power division units, two phase-shifting lines 1 and two phase-shifting lines 2, and the two phase-modulating media The substrate covers a part area of one-to-three filter power division units and two phase-shifting lines one and two phase-shifting lines two.

The two one-to-two unequal filter power division units are symmetrically arranged on both sides of the one-to-three filter power division unit, and the three output ends of the one-to-three filter power division unit output equal-amplitude in-phase signals, wherein The two output ends are respectively connected with the phase-shifting lines located on both sides, and the other output end is connected with the coaxial feed port;

The input end of the one-to-two filter power division unit is connected to the first phase-shifting line, and the two output ends output in-phase and unequal amplitude signals, which are respectively connected to the second phase-shifting line and the coaxial feeding port.

The matching impedance of the three output ends of the one-to-three filter power division unit is 50 ohms.

The matching impedance of the input end of the one-to-two filter power division unit is the characteristic impedance corresponding to the phase-shifting line one when the phase-modulating medium substrate is not covered, the matching impedance of the output end connected to the coaxial feed port is 50 ohms, and the other The matching impedance of the output end is the characteristic impedance corresponding to the area of the phase-modulating medium substrate that is not covered by the phase-shifting line two.

The two ends of the phase-modulating medium substrate are provided with two rectangular grooves distributed at intervals as matching units. By adjusting the width and spacing of the rectangular grooves, the first phase-shifting line and the second phase-shifting line are not covered and when the phase-modulating medium substrate is covered. The matching between the corresponding two characteristic impedances.

The line widths of the first phase-shifting line and the second phase-shifting line are set to the width corresponding to the characteristic impedance of 50 ohms when they are covered by the phase-modulating medium substrate.

The one-to-three filter power division unit realizes the filtering function by four open-circuit branch loading structures;

The one-to-two unequal filtering power division unit realizes the filtering function by three open-circuit branch loading structures.

The power ratio of the output end of the one-to-two unequal filtering power division unit is -1.6dB:-5.1dB.

There are six coaxial feed ports and metal connection posts, the coaxial feed port includes a coaxial wire, and the coaxial wire solders the inner conductor to the circuit of the suspended dielectric substrate through the through hole of the metallic connection post, The outer conductor is in contact with the metal connecting post to realize grounding.

The feeding network simultaneously realizes three functions of filtering, power division and phase shifting.

The beneficial effects of the present utility model:

1. The three functional circuits of filtering, power division and phase shifting are integrated into the design. Compared with the conventional method of designing different functional circuits independently and then cascading, the problem of cascade mismatch is avoided, and the circuit insertion loss is reduced. The overall performance is improved while the circuit size is reduced.

2. By moving the position of the phase modulation medium substrate, the phase difference between different output ports of the feeding network can be easily controlled to meet the phase distribution requirements for the downtilt adjustment of the antenna beamforming.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present utility model;

Fig. 2 is the principle diagram of the utility model;

Fig. 3 is the top view of the utility model;

Fig. 4a is the dimensioning drawing of the one-to-three filter power division unit of the feeding network of the present invention;

Fig. 4b is the dimensioning drawing of the filter power division unit of one-to-two unequal division of the feeder network of the present invention;

Fig. 4c is a dimension drawing of a phase modulation dielectric substrate of a feeding network of the present invention;

Fig. 5 is the frequency response characteristic curve diagram of the feeding network of the utility model;

6a is the phase difference between the output signals of P3 and P5 when the phase modulation medium substrate of the power feeding network of the present invention moves to the right;

Fig. 6b shows the phase difference between the output signals of P4 and P6 when the phase modulation medium substrate of the power feeding network of the present invention moves to the right.

Detailed ways

The present utility model will be further described in detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present utility model are not limited thereto.

Example

As shown in Figure 1, an antenna array feed network integrated with filtering, power division and phase shifting includes upper and lower metal floors 1, six metal connecting posts 2, coaxial feed ports 3, suspended dielectric substrates 4, Suspended strip line 5 and two phase-modulating dielectric substrates 6; the two phase-modulating dielectric substrates have the same structural dimensions.

Figure 2 shows the principle block diagram of the integrated design of the feeder network of the utility model. The conventionally designed feeder network is composed of separately designed filters, power dividers and phase shifters in cascade, and the circuit has an inevitable cascade connection. To solve the mismatch problem, the utility model integrates multiple devices into a single device to realize the original function, improves the overall performance of the circuit, and reduces the volume of the circuit at the same time.

The metal floors on the upper and lower layers realize common ground through six metal connecting columns arranged between the two metal floors. The six metal connecting columns are arranged in a line, and the metal floors on the upper and lower layers are placed horizontally.

The six coaxial feed ports P1-P6 are implemented in that the inner conductor of the coaxial wire is welded to the circuit of the suspended dielectric substrate through the through hole of the metal connecting column, and the outer conductor is in contact with the metal connecting column to realize grounding. .

As shown in FIG. 3 , the two phase-modulating dielectric substrates are placed horizontally between two layers of dielectric substrates, the suspended dielectric substrate is placed between the two phase-modulating dielectric substrates, and the suspended striplines are printed on the suspended dielectric. On the substrate, the suspended stripline is printed on the suspended dielectric substrate, including a one-to-three filtering power division unit, two one-to-two unequal filtering power division units, two phase-shifting lines one, two shifting power division units. Phase line 2, the one-to-three filter power division unit is located in the middle position, other circuits are symmetrically arranged on both sides of the one-to-three filter power division unit, and the two phase modulation dielectric substrates cover the one-to-three filter power division unit and Part of the area of the two phase-shifting lines 1 and the two phase-shifting lines 2.

The two ends of the two phase-modulating dielectric substrates are provided with two rectangular grooves distributed at intervals, which are used to change the characteristic impedance of the suspended stripline in the corresponding area. The strip line in the corresponding area is a low impedance line, and the three partial strip lines form a step impedance structure. As the matching unit 9, by adjusting the width and spacing of the two rectangular slots, the electrical length of each part of the step impedance structure is changed. , to achieve matching between the two characteristic impedances corresponding to the phase-shifting line 1 and the phase-shifting line 2 when the phase-shifting line 1 and the phase-shifting line 2 are uncovered and when the phase-modulating medium substrate is covered. At the same time, by moving the phase-modulating dielectric substrate, the range covered by the phase-shifting line 1 and phase-shifting line 2 on the left and right sides is changed by the dielectric substrate, so as to change the equivalent electrical length of the phase-shifting line 1 and phase-shifting line 2 on the left and right sides to realize the output. Different phase differences between ports.

The one-to-three filter power division unit 7 realizes the filtering function through four open-circuit branch loading structures. The input end is connected to the coaxial feed port P1. The shaft feeds port P2, and the other two outputs are connected to one end of two phase-shift lines one lps1.

As shown in Figure 3, the filtering function of the one-to-two unequal filtering power division unit 8 realizes the filtering function through three open-circuit branch loading structures, the two outputs are in phase, and the power ratio is -1.6dB:-5.1dB. To the other end of the phase-shifting line 1, the matching impedance is the characteristic impedance corresponding to the phase-shifting line 1 when the phase-modulating medium substrate is not covered, and the output one is connected to the coaxial feed port P4 or P6, and the matching impedance is 50 ohms, and the other is 50 ohms. One is connected to one end of phase-shifting line 2 lps2, and the other end of phase-shifting line 2 lps2 is connected to coaxial feed port P3 or P5, and the matching impedance is the characteristic impedance corresponding to phase-shifting line 2 not covering the phase-modulating medium substrate. Wherein, when the line widths of the phase-shifting line 1 and the phase-shifting line 2 are set to cover the phase-modulating medium substrate, the characteristic impedance is the width corresponding to 50 ohms.

In this embodiment, the operating frequency of the feeding network of the present invention is 1.4-2.7GHz, the thickness of the plate used for processing the suspended dielectric substrate is 0.2mm, the relative dielectric constant is 3.38, the tangent loss is 0.0027, and the phase modulation dielectric substrate is The thickness of the plate used for processing is 3.048mm, the relative dielectric constant is 2.94, the tangent loss is 0.0012, and the distance between the upper and lower metal floors is 6.4mm. 4b and 4c, the specific parameters are as follows:

w ₀ =4.3mm,w ₁ =1.4mm,w ₂ =0.9mm,w ₃ =0.7mm,w ₄ =2.3mm,w ₅ =3.8mm,w ₆ =4.8mm,w ₇ =1.2mm,w ₈ =3.0mm,w ₉ =2.6mm,w ₁₀ =2.2mm,w ₁₁ =2.5mm,w ₁₂ =8.4mm,w ₁₃ =2mm,w ₁₄ =3.5mm,w ₁₅ =6.6mm,w ₁₆ =7.6mm ,w _s1 =2.8mm,w _s2 =1.1mm,w _s3 =2.4mm,w _s4 =3mm,w _s5 =3.3mm,w _s6 =2.4mm,w _s7 =3.8mm,w _p =9.2mm,l ₀ = _7mm , _l1 =6.6mm, _{l2 = 9.8mm} , l3= _8.6mm , l4=13.8mm, l5=2.9mm, _l6 =16mm, l7= _15.2mm , l8=18.2mm, l ₉ = 7.8mm, l ₁₀ = 10.8mm, l ₁₁ = 6mm, l ₁₂ = 13.1mm, l ₁₃ = 26.6mm, l ₁₄ = 23.5mm, l ₁₅ = 30.2mm, l ₁₆ = 22.6mm, l _s1 = 8.2mm, l _s2 = 11.1mm, l _s3 = 11.3mm, l _s4 = 11.8mm, l _s5 = 17.4mm, l _s6 = 20.6mm, l _s7 = 17.3mm, l _p = 4mm, l _ps1 = 119mm, l _ps2 =105mm, lx= _256.4mm , _{lx1 =} 18mm, lx2=10.8mm, lx3=7.1mm, _ly =51mm, _ly1 = _36.1mm .

As shown in FIG. 5 , which is a characteristic curve diagram of the frequency response of the feeder network of the present invention, in the passband range of 1.4-2.7GHz, _S11 is less than -20dB, indicating that the input ports are well matched. Since the power ratio of the one-to-two unequal filtering power division unit in this embodiment is -1.6dB:-5.1dB, ideally, the signal power ratio between each output port is, S ₂₁ :S ₃₁ :S ₄₁ :S ₅₁ :S ₆₁ =-4.77dB:-9.87dB:-6.37dB:-9.87dB:-6.37dB. It can be found from Figure 5 that the amplitudes of the output signals of port P3 and port P5 are basically the same in the passband frequency range, the amplitude of the output signals of port P4 and port P6 are basically the same, and the amplitude unbalance of the output signal is less than 1.5dB. The loss is not more than 1.6dB. In the out-of-band 3.38-5GHz frequency range, the suppression level is greater than 40dB, the circuit has high sideband roll-off characteristics and out-of-band suppression capability, and the filtering performance is good.

As shown in Fig. 6a, it is the phase difference between the output signals of port P3 and port P5 when the phase modulation medium substrate of the power feeding network of the present invention moves to the right (the moving distance is denoted as dm), and Fig. 6b is the phase difference between port P4 and port P6 The phase difference between the output signals, it can be seen that when the phase modulation medium substrate does not move (dm=0mm), within the operating frequency range of 1.4-2.7GHz, the output signals of port P3 and port P5 are basically in phase, and port P4 and port P6 are basically in phase. The output signals are basically in phase. The greater the moving distance dm, the greater the phase difference between the output signals. When dm=20mm, the phase difference between the output signals of port P3 and port P5 fluctuates in the passband frequency range [-77.3°, -174.3°], and port P4 The phase difference with the output signal of port P6 fluctuates in the frequency range of the passband as [-37.7°, -90.9°]. Since only phase shift line 1 passes from port P1 to port P4 and port P6, while phase shift line 1 and phase shift line 2 pass from port P1 to port P3 and port P5, due to symmetry, when the phase modulation medium substrate moves , the phase difference of the output signals of port P3 and port P5 is twice the phase difference of the output signals of port P4 and port P6, and the result basically conforms to this law.

To sum up, the antenna array feeding network with integrated filtering, power division and phase shifting proposed by the present invention integrates multiple functions of filtering, power division and phase shifting. , can easily control the phase difference of the signal between the output ports. The circuit of the utility model has the advantages of low loss, high integration, small size and the like, and is suitable for many radio frequency systems.

The above-mentioned embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited by the described examples, and any other changes, modifications, Substitution, combination, and simplification should all be equivalent substitution methods, which are all included in the protection scope of the present invention.

Claims (9)

1. A filtering power division and phase shift integrated antenna array feed network is characterized by comprising an upper layer metal floor, a lower layer metal floor, metal connecting columns, a coaxial feed port, a suspension medium substrate, a suspension strip line and two phase modulation medium substrates;

the upper and lower metal floors are grounded through metal connecting columns, the suspension strip line is arranged on a suspension medium substrate, the suspension medium substrate is horizontally arranged between two phase modulation medium substrates, and the two phase modulation medium substrates are horizontally arranged between the upper and lower metal floors;

the suspension strip line comprises a one-to-three filtering power dividing unit, two one-to-two unequal filtering power dividing units, two phase shifting lines I and two phase shifting lines II, and the two phase modulation dielectric substrates cover partial areas of the one-to-three filtering power dividing unit, the two phase shifting lines I and the two phase shifting lines II.

2. The antenna array feed network of claim 1, wherein the two divide-by-two unequal filter power dividing units are symmetrically disposed at two sides of the divide-by-three filter power dividing unit, three output terminals of the divide-by-three filter power dividing unit output equal-amplitude in-phase signals, two of the output terminals are respectively connected to the phase-shifting lines at two sides, and the other output terminal is connected to the coaxial feed port;

the input end of the one-to-two filtering power dividing unit is connected with the phase shifting line I, and the two output ends output signals with same phase and different amplitude, and are respectively connected with the phase shifting line II and the coaxial feed port.

3. The antenna array feed network of claim 2, wherein the matching impedance of the three output ends of the divide-by-three filtering power dividing unit is 50 ohms.

4. An antenna array feed network according to claim 2,

the input end matching impedance of the one-to-two filtering power dividing unit is the characteristic impedance corresponding to the phase shifting line I uncovered with the phase modulation medium substrate, the output end matching impedance connected to the coaxial feed port is 50 ohms, and the other output end matching impedance is the characteristic impedance corresponding to the phase shifting line II uncovered with the phase modulation medium substrate.

5. The antenna array feed network of claim 1, wherein two rectangular slots spaced apart are provided at two ends of the phase modulating dielectric substrate as matching units.

6. The antenna array feed network of claim 1, wherein the linewidths of the phasing lines one and two are configured to have a width corresponding to a characteristic impedance of 50 ohms when covered by a phase modulating dielectric substrate.

7. The antenna array feed network of claim 1, wherein the divide-by-three filtering power dividing unit implements filtering function by four open-circuit branch loading structures;

the one-to-two unequal filtering power division unit realizes the filtering function by three open-circuit branch loading structures.

8. The antenna array feed network of claim 1, wherein the power ratio of the output end of the one-to-two unequal filtering power division unit is-1.6 dB-5.1 dB.

9. The antenna array feed network of claim 1, wherein there are six coaxial feed ports and metal connection posts, the coaxial feed ports comprising a coaxial wire having an inner conductor soldered to the circuitry of the suspended dielectric substrate through a via in the metal connection post and an outer conductor in contact with the metal connection post for grounding.

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