A frequency and pattern hybrid reconfigurable antenna

Abstract

The application discloses a frequency and pattern mixed reconfigurable antenna and belongs to the technical field of antennas. The frequency and pattern mixed reconfigurable antenna is characterized in that a circular radiation patch is used as a main radiation unit and is fed by a coplanar waveguide. Meanwhile, a metal open metal ring is arranged between the circular radiation patch and a ground plate, six slits are arranged between the radiation patch, the metal ring and the metal ground plane, and two I-shaped slits are arranged in the circular radiation patch. Eight PIN diodes are loaded at the positions of the slits. The reconfiguration of the frequency and the pattern is realized by controlling the combined working states of the PIN diodes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, and particularly relates to a frequency and pattern mixed reconfigurable antenna. BACKGROUND

[0002] The various radio frequency parameter indexes required by an antenna, such as a working frequency (frequency band), a radiation pattern, and a polarization mode of the antenna, are determined by the current distribution on the closed surface in the antenna structure. A reconfigurable antenna can change the radio frequency path on the closed surface by using some radio frequency switches, so as to change the working characteristics of the antenna. The four modes mainly include a frequency reconfigurable antenna, a pattern reconfigurable antenna, a polarization reconfigurable antenna, and a mixed reconfigurable antenna.

[0003] An ideal frequency reconfigurable antenna can dynamically change the frequency of the antenna while ensuring that other working states (radiation pattern and polarization mode) remain unchanged. However, in actual applications, it is difficult to ensure that the other radiation characteristics (such as the pattern and the polarization mode) remain stable while the resonant frequency is changed, and therefore this is also a difficulty in designing a mixed reconfigurable antenna.

[0004] Existing reconfigurable antennas such as

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[0007] The existing reconfigurable antenna is mainly reconfigurable in a single working state (frequency, pattern, polarization), and it is difficult to ensure that the antenna can keep stable state in other radiation characteristics while changing a working state due to the interference of multiple factors. In view of this, the application provides a frequency and pattern mixed reconfigurable antenna. The antenna realizes the characteristics of mixed frequency and pattern regulation and control by loading a gap and controlling a parasitic unit.

[0008] The technical scheme of the application is as follows:

[0009] The application provides a frequency and pattern mixed reconfigurable antenna, which comprises a circular radiation patch, an open metal ring, a microstrip transmission line, a ground metal surface, a parasitic unit and a dielectric substrate.

[0010] The specific structure is described as follows:

[0011] The circular radiation patch is connected through the microstrip transmission line, and the circular radiation patch and the ground metal surface are coplanar. Two 'I' type slots are opened between the circular radiation patch and the microstrip transmission line, and are symmetrically distributed on both sides of the microstrip transmission line. An open metal ring is arranged at the middle position of the gap between the circular radiation patch and the ground metal surface, and the open metal ring is placed at the periphery of the circular radiation patch, and the opening of the circular ring is located on one side of the microstrip transmission line. The open metal ring, the ground metal surface and the circular radiation patch each have a certain width of the slotted gap.

[0012] The application provides a frequency and pattern mixed reconfigurable antenna, eight PIN diodes are respectively arranged between the open metal ring and the ground metal surface, the open metal ring and the circular radiation patch, and the circular radiation patch and the microstrip transmission line. By loading a gap and controlling a parasitic unit, the function of mixed frequency and pattern regulation and control is realized. By controlling the working state of the eight PIN diodes, the stable regulation and control of the frequency and the pattern are realized, and the application has the characteristics of simple structure, multiple mode adjustment and stable operation. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The top view of the frequency and pattern mixed reconfigurable antenna of the application.

[0014] Figure 2 The side view of the frequency and pattern mixed reconfigurable antenna of the application.

[0015] Figure 3 The simulation result of mode one of the frequency and pattern mixed reconfigurable antenna of the application, (a) reflection coefficient, (b) E plane and H plane radiation pattern.

[0016] Figure 4Simulation results of Mode 2 of the frequency and pattern hybrid reconfigurable antenna of the present invention: (a) reflection coefficient, (b) radiation patterns of the E-plane and H-plane.

[0017] Figure 5 Simulation results of Mode 3 of the frequency and pattern hybrid reconfigurable antenna of this invention: (a) reflection coefficient, (b) radiation patterns of the E-plane and H-plane.

[0018] Figure 6 Simulation results of Mode 4 of the frequency and pattern hybrid reconfigurable antenna of this invention: (a) reflection coefficient, (b) radiation patterns of the E-plane and H-plane.

[0019] Figure 7 Simulation results of Mode 5 of the frequency and pattern hybrid reconfigurable antenna of the present invention: (a) reflection coefficient, (b) radiation patterns of the E-plane and H-plane. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, this invention provides a patch antenna structure for a frequency and pattern hybrid reconfigurable antenna, which consists of six parts: a circular radiating patch (12), an open metal ring (11), a microstrip transmission line (13), a grounded metal surface (10), parasitic elements (40, 41, 42, 43, 44, 45, 46, 47) and a dielectric substrate (50).

[0022] The dielectric substrate (50) is FR4 with a dielectric constant of 4.4, a loss tangent of 0.02, and a size of W. sub *L sub *h d The circular radiating patch (12), the open metal ring (11), the microstrip transmission line (13), the ground metal surface (10), and the parasitic unit are all tightly attached to the top layer of the dielectric substrate (50). A circular groove with a radius of R1 is cut out on the ground metal surface (10), and a metal open ring (11) with an outer diameter of R2 and an inner diameter of R3 is placed in the center of the circular groove. cThe circular radiation patch (12) is connected to the microstrip transmission line (13) with a width of d1, which is drawn from the lower edge of the dielectric substrate (50), and a pair of symmetric "I" type slots (36, 37) are opened at the end of the microstrip transmission line (13). A slot with a width of d2 is also dug in the ground metal surface (10) where the microstrip transmission line (13) is located. As shown in Figure 1 the size of the slots (30, 31, 32, 33, 34, 35, 36, 37) is W s *L s A parasitic element (40, 41, 42, 43, 44, 45, 46, 47) is placed at each slot (30, 31, 32, 33, 34, 35, 36, 37). At this time, the parasitic element (40, 41, 42, 43, 44, 45, 46, 47) is a PIN diode of MA4AGBLP912. The PIN diode of MA4AGBLP912 type is equivalent to a 0.5nH inductor and a 4Ω resistor in series in the on state, and equivalent to a 0.5nH inductor and a 4000Ω resistor and a 0.025pF capacitor in parallel in the off state. The package size of this type of diode is 0.3mm*0.2mm.

[0023] Table 1 Detailed dimensions of the antenna

[0024] Parameter [WC sub ]]> [[ L sub ]]> h d ]]> [R1] [R2] [R3] [R c ]]> d1 [d2] [WC s ]]> [[ L s ]]> Value 140 140 1.5 47 44 41 38 3.2 9.4 3 0.3

[0025] Table 2 illustrates the on-off state of all PIN diodes of the antenna in each working mode. At this time, for convenience of expression, the PIN diodes are numbered. The PIN diodes placed at the parasitic elements (40, 41, 42, 43, 44, 45, 46, 47) are named S1, S2, S3, S4, S5, S6, S7, S8 respectively.

[0026] Table 2 Correspondence table between antenna working mode and PIN diode

[0027] S1 S2 S3 S4 S5 S6 S7 S8 Mode 1 on on off off off off off off Mode 2 off off off off off off off off Mode 3 on on on on off off off off Mode 4 on on on on on on off off Mode 5 on on on on off off on on

[0028] As shown in Table 2:

[0029] When the antenna is in working mode one, the slots on the circular radiation patch form a closed loop, and the antenna can simultaneously resonate in the slots of the inner and outer rings. At this time, the antenna works in a 2.4GHz and 3.4GHz dual frequency mode, which can adapt to the needs of n41 and n78 dual frequency band monitoring.

[0030] When the antenna is in working mode two, the slots on the circular radiation patch resonate, and the antenna works in a 2.4GHz single frequency mode, which can adapt to the needs of n41 single frequency band narrowband monitoring.

[0031] When the antenna is in the working mode three, S1-S4 are turned on, at this time the split of the outer ring is disconnected by the circular ring, the antenna only resonates on the split of the inner ring, the antenna works in 3.30-3.60GHz, and the radiation direction of the antenna is ±30°, ±150°.

[0032] When the antenna is in the working mode four, the antenna resonates on the split of the inner ring, and the turn-on of S5 and S6 makes the electric field distribution of the antenna uneven, the antenna works in the n78 single frequency band, and the radiation direction is-150°-30°.

[0033] When the antenna is in the working mode five, the antenna works in the n78 single frequency band, and the radiation direction is 30°-150°.

Claims

1. A frequency and pattern reconfigurable antenna, comprising a circular radiating patch (12), an open metal ring (11), a microstrip transmission line (13), a ground metal plane (10), a first parasitic element (40), a second parasitic element (41), a third parasitic element (42), a fourth parasitic element (43), a fifth parasitic element (44), a sixth parasitic element (45), a seventh parasitic element (46), an eighth parasitic element (47) and a dielectric substrate (50). The circular radiating patch (12) of the antenna is connected with the microstrip transmission line (13), and the circular radiating patch (12) is coplanar with the ground metal plane (10), and the antenna is fed in the mode of coplanar waveguide. A pair of symmetric "I" type slots, i.e., a first "I" type slot (30) and a second "I" type slot (31), are opened on both sides of the end of the microstrip transmission line (13), and the first "I" type slot and the second "I" type slot are arranged between the circular radiating patch (12) and the microstrip transmission line (13) of the antenna and are symmetrically distributed on both sides of the microstrip transmission line (13). An open metal ring (11) is arranged at the middle position of the gap between the circular radiating patch (12) and the metal ground plane, and the open metal ring (11) is placed at the periphery of the circular radiating patch (12), and the microstrip transmission line (13) passes through the opening of the open metal ring (11) and is connected with the circular radiating patch (12). A first slotted gap (20) is arranged between the open metal ring (11) and the ground metal plane (10), and a second slotted gap (21) is arranged between the open metal ring (11) and the circular radiating patch (12). The first parasitic element (40) is arranged on the first "I" type slot (30), the second parasitic element (41) is arranged on the second "I" type slot (31), the third parasitic element (42), the fourth parasitic element (43), the sixth parasitic element (45) and the eighth parasitic element (47) are arranged on the first slotted gap (20), and the fifth parasitic element (44) and the seventh parasitic element (46) are arranged on the second slotted gap (21).

2. A frequency and pattern hybrid reconfigurable antenna according to claim 1, characterized in that: The ground metal plane (10), the microstrip transmission line (13) and the open metal ring (11) of the antenna are all made of 1OZ thick copper material, and the dielectric substrate (50) is made of FR4 board material.

3. The frequency and pattern hybrid reconfigurable antenna according to claim 1, wherein: The ground metal plane (10), the microstrip transmission line (13), the open metal ring (11) and the parasitic elements of the antenna are all conductively connected to the top layer of the dielectric substrate (50), and the bottom layer of the dielectric substrate (50) is not treated.

4. The frequency and pattern hybrid reconfigurable antenna according to claim 1, wherein: The layout of the antenna is axially symmetrically distributed along the transmission direction of the microstrip transmission line (13).

5. The frequency and pattern hybrid reconfigurable antenna according to claim 1, wherein: The first parasitic element (40), the second parasitic element (41), the third parasitic element (42), the fourth parasitic element (43), the fifth parasitic element (44), the sixth parasitic element (45), the seventh parasitic element (46) and the eighth parasitic element (47) of the antenna are all MA4AGBLP912 type PIN diodes, and all can be independently controlled.

6. A first parasitic element (40), a second parasitic element (41), a third parasitic element (42), a fourth parasitic element (43), a fifth parasitic element (44), a sixth parasitic element (45), a seventh parasitic element (46), an eighth parasitic element (47) of a frequency and pattern hybrid reconfigurable antenna according to claim 5, characterized in that When the PIN diode is in the on state, it is equivalent to a resistor; when the PIN diode is in the off state, it is equivalent to a capacitor and a resistor in parallel.

7. A parasitic element of a frequency and pattern hybrid reconfigurable antenna according to claim 5, characterized in that: The first parasitic unit (40), the second parasitic unit (41), the third parasitic unit (42), the fourth parasitic unit (43), the fifth parasitic unit (44), the sixth parasitic unit (45), the seventh parasitic unit (46), and the eighth parasitic unit (47) are conductively connected with the metal surface in contact.

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