CN107634343A - A dual-band coplanar co-aperture base station antenna - Google Patents

Abstract

The invention discloses a kind of coplanar Shared aperture antenna for base station of two-band, is made up of feed circuit plate (2), reflection floor (3), the dipole antenna (5) being printed on first medium substrate (4) and suspension paster antenna (6).The present invention can be used in microwave and millimeter wave communication system, particularly the antenna for base station of the coplanar Shared aperture of two-band.Its advantage is low section height, planarization, in light weight, inexpensive, the process-cycle is fast.

Description

A dual-band coplanar co-aperture base station antenna

technical field

The invention belongs to the technical field of microwave antennas, in particular to a dual-band co-planar co-aperture base station antenna in microwave antennas.

Background technique

With the rapid development of modern communication systems, mobile base stations are also developing in the direction of low profile, miniaturization, light weight, and low cost. The dual-band or even multi-band coplanar antenna is a low-profile, multi-frequency, multi-mode, low-cost integrated antenna suitable for mobile base stations produced under this situation. The dual-band coplanar base station antenna meets the needs of mobile While meeting the multi-frequency and multi-mode requirements of the base station, it greatly improves the cost and space waste caused by the non-coplanar design of the high and low frequency band antennas in the traditional base station.

In the traditional base station antenna design, the high frequency band and low frequency band are generally realized by using dipoles and reflectors. In order to realize the unidirectional radiation performance of the antenna, the distance between the dipole and the floor follows the principle of a quarter wavelength. Due to the large frequency gap between the high frequency band and the low frequency band, the height of the high frequency dipole relative to the floor must be lower than that of the low frequency dipole relative to the floor, even though the low frequency dipole may use some methods to reduce the profile height Technology reduces the overall height, and the high and low frequency dipoles cannot be realized on the same plane. Therefore, the overall height of the traditional base station antenna is limited by the height of the low-frequency dipole, the profile is high, it takes up a lot of space, the volume is large, and the processing cost is high, it is not easy to integrate, it is not conducive to mass production, and it is in urgent need of improvement.

Contents of the invention

The purpose of the present invention is to propose a dual-band coplanar and co-aperture base station antenna, which overcomes the shortcomings of existing base station antennas, such as high profile, non-coplanar high and low frequencies, heavy weight, large volume, and high processing cost.

The technical solution of the present invention is: a dual-band coplanar co-aperture base station antenna, including a radiation circuit board, a feeder circuit board, and a reflection floor; the radiation circuit board includes a first dielectric substrate, printed on the first dielectric substrate The dipole antenna and the suspended patch antenna; the feed circuit board includes a second dielectric substrate, a third dielectric substrate, a 180-degree feed network printed on the front of the second dielectric substrate, and a printed circuit board on the front of the third dielectric substrate. Share the floor and the 0-degree feeding network on the opposite side; the normal axis of the radiation circuit board and the reflection floor is coaxial, and the feed circuit board is located on the normal axis between the radiation circuit board and the reflection floor.

Further, the dipole antenna includes a first dipole arm printed on the back of the first dielectric substrate, a second dipole arm printed on the front of the first dielectric substrate, and a first dipole arm etched on the second dipole arm. One feeding round hole, two parasitic triangular patches, pad and the second feeding round hole etched on the pad; the first dipole arm and the second dipole arm are exactly the same size; two parasitic The triangular patches are placed symmetrically and have the same size; the first feed circular hole and the second feed circular hole are located directly above the non-metallized through hole on the first dielectric substrate.

Further, the 180-degree feeding network printed on the front side of the second dielectric substrate includes a normal parallel double line part, a first impedance transformation microstrip line and a first inverted G-shaped coupling line.

Further, the 0-degree feed network printed on the back of the third dielectric substrate is symmetrical to the 180-degree feed network printed on the front of the second dielectric substrate with respect to the center of the vertical axis of the feed circuit board; the 0-degree feed network includes The negative parallel double line part, the second impedance transformation microstrip line and the second inverted G-shaped coupling line; the positive parallel double line part and the negative parallel double line part are located directly above the third feeding circular hole on the reflective floor .

Further, the common floor printed on the front of the third dielectric substrate includes a horizontal rectangular floor with a gap and two short-circuit metal strips; the two short-circuit metal strips pass through the through holes in the first dielectric substrate through pins, suspending the patch antenna The short-circuit hole on the ground is connected with the suspended patch antenna; the horizontal rectangular floor is connected with the reflection floor.

Advantages and beneficial effects of the present invention:

(1) Compared with the traditional non-coplanar dual-band base station antenna, the present invention has the advantages of planarization, low section height and compact structure. Compared with the traditional base station antenna with non-coplanar high and low frequency band units, in the case of ensuring the broadband and good pattern of the antenna in the two frequency bands, by printing the two frequency bands with a dipole antenna and a suspended patch antenna On the same dielectric board, the overall section height of the antenna is reduced, the weight is lighter, the cost is lower, and the processing cycle is shorter;

(2) Compared with the existing coplanar dual-band antenna, the high and low frequency bands of the dual-band coplanar co-aperture antenna unit in the present invention are respectively fed by two feed ports, and no additional power division is required in the array design device, thereby reducing the cost after formation.

(3) dual-band coplanar co-aperture antenna of the present invention realizes owing to adopting dipole to be nested in the middle of ring suspension patch antenna, the impedance matching of the dipole antenna of high frequency band can be very large by adjusting the size of ring patch antenna easy to accomplish.

(4) The differential feed network involved in the low-frequency feed network of the dual-band coplanar co-aperture antenna of the present invention is printed on a vertical support plate, thereby solving the problem of feeding power due to the fact that the back of the antenna floor is close to the metal plate in actual use. Difficult problems in network design.

Description of drawings

Fig. 1 is the overall structural representation of the present invention

Fig. 2 is a schematic diagram of the structure of the low-frequency band feeding part of the present invention

Fig. 3 is a structural representation of the high frequency band dipole antenna of the present invention

detailed description

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment: as shown in Figure 1, a kind of dual-band coplanar co-aperture base station antenna comprises radiation circuit board 1, feeder circuit board 2, reflection floor 3; Described The radiation circuit board 1 includes a first dielectric substrate 4, a dipole antenna 5 printed on the first dielectric substrate 4, and a suspended patch antenna 6; the feed circuit board 2 includes a second dielectric substrate 7, a third Dielectric substrate 8, printed 180-degree feed network 9 on the front of the second dielectric substrate 7, printed common floor 10 on the front of the third dielectric substrate 8, and 0-degree feed network 11 on the reverse side; the radiation circuit board 1 and reflective floor 3 normal coaxial, the feed circuit board 2 is located on the normal axis between the radiation circuit board 1 and the reflection floor 3.

Further, the dipole antenna 5 includes a first dipole arm 51 printed on the back of the first dielectric substrate 4, a second dipole arm 52 printed on the front of the first dielectric substrate 4, and a second dipole arm 52 etched on the second dipole The first feed circular hole 54 on the sub-arm 52, the two parasitic triangular patches 53, the pad 54, and the second feed circular hole 56 etched on the pad 54; the first dipole arm 51 and the second dipole arm 51 The dimensions of the two dipole arms 52 are exactly the same; the two parasitic triangular patches 53 are placed symmetrically and have the same size; the first feeding circular hole 54 and the second feeding circular hole 56 are located directly above hole 41.

Further, the 180-degree feeding network 9 printed on the front side of the second dielectric substrate 7 includes a positive parallel double line part 91 , a first impedance transformation microstrip line 92 and a first inverted G-shaped coupling line 93 .

Further, the 0-degree feed network 11 printed on the back of the third dielectric substrate 8 is symmetrical to the 180-degree feed network 9 printed on the front of the second dielectric substrate 7 with respect to the center of the vertical axis of the feed circuit board 2; The feed network 11 includes a negative parallel double line part 111, a second impedance transformation microstrip line 112 and a second inverted G-shaped coupled line 113; the positive parallel double line part 91 and the negative parallel double line part 111 are located on the reflection floor 3 directly above the third feeding hole 31.

Further, the common floor 10 printed on the front of the third dielectric substrate 8 includes a horizontal rectangular floor 102 with a gap and two short-circuit metal strips 101; the two short-circuit metal strips 101 pass through the through holes in the first dielectric substrate 4 through pins 42. The short-circuit through hole 61 on the suspended patch antenna 6 is connected to the suspended patch antenna 6; the horizontal rectangular floor 102 is connected to the reflective floor 3.

The principle of the technical solution of the present invention is: the dipole antenna 5 printed on the first dielectric substrate 4 works in the high-frequency band, and by adjusting the gap between the two parasitic triangular patches 53 and the dipole antenna 5, the high The imaginary part of the frequency dipole antenna 5 becomes flatter. The suspended patch antenna 6 as a low-frequency radiator can not only work in the low frequency band as a suspended patch, but also affect the impedance matching of the high-frequency dipole antenna 5, and adjust the distance between the inner side of the suspended patch antenna 6 and the dipole The distance of the sub-antenna 5 can make the input impedance of the dipole antenna 5 well matched within a wide frequency band. The suspended patch antenna 6 is fed through the differential feed network printed on the feed circuit board 2, and the differential feed network converts the parallel double lines into microstrip lines, and passes through the first inverted G-shaped coupling line 93 and the second The inverted G-shaped coupling line 113 couples and feeds the suspended patch antenna 6 . Adjusting the position and size of the first inverted G-shaped coupling line 93 and the second inverted G-shaped coupling line 113 can adjust the impedance matching of the low frequency band suspended patch antenna 6 . In order to further adjust the impedance matching of the suspended patch antenna 6, two short-circuit metal strips 101 are introduced, and the gap between the first inverted G-shaped coupling line 93 and the second inverted G-shaped coupling line 113 and the two short-circuit metal strips 101 is adjusted. It can make the low-frequency band suspension patch antenna achieve a better matching state

In order to further illustrate the practicability of the above-mentioned technical solution, a specific design example is given below, a dual-band coplanar co-aperture base station antenna, the designed low-frequency band suspension patch antenna 6 works at 820MHz～960MHz, and the high-frequency band dipole The working frequency band of the sub-antenna 5 is 1710MHz-2690MHz. Suspension patch antenna 6 has an inner dimension of 80mm×80mm, an outer dimension of 130mm×160mm, and dipole antenna 5. is 5mm. The length of the first impedance transformation microstrip line 92 and the second impedance transformation microstrip line 112 are both 70.65 mm, and the width is 2.2 mm. The height of the first inverted G-shaped coupling line 93 and the second inverted G-shaped coupling line 113 is 27.5 mm. mm, the horizontal length is 25mm, the vertical height of the end is 20mm, the horizontal part of the end is 5mm long, the gap width between the first inverted G-shaped coupling line 93 and the second inverted G-shaped coupling line 113 and the vertical short-circuit metal strip 101 Both are 0.8mm. The short-circuit metal strip 101 is 26mm long and 2mm wide. The width of the parallel double line part is 5.5mm. The feed circuit board 2 is 40mm high. The test results show that the standing wave of the low frequency band suspension patch antenna 6 is less than 2 in the frequency band of 796MHz-984MHz, and the maximum gain range is 8.5dB-9.5dB. The working frequency band of the high-frequency dipole antenna 5 is 1474MHz-2781MHz, the standing wave is less than 2, and the maximum gain range is 7.6dB-10.1dB. The isolation between the two ports in the high and low frequency bands is greater than 23dB.

Those skilled in the art will appreciate that the embodiments described here are to help readers understand the principles of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical revelations disclosed in the present invention without departing from the present invention, and these modifications and combinations are still within the protection scope of the present invention.

Claims (5)

1. A dual-band coplanar co-aperture base station antenna comprises a radiation circuit board (1), a feed circuit board (2), and a reflection floor (3); it is characterized in that: the radiation circuit board (1) includes the first A dielectric substrate (4), a dipole antenna (5) and a suspended patch antenna (6) printed on the first dielectric substrate (4); the feed circuit board (2) includes a second dielectric substrate (7), the third dielectric substrate (8), the 180-degree feed network (9) printed on the front side of the second dielectric substrate (7), the common floor (10) printed on the front side of the third dielectric substrate (8) and the 0 on the reverse side degree feeder network (11); described radiation circuit board (1) and reflection floor (3) normal coaxial, described feeder circuit board (2) is positioned at radiation circuit board (1) and reflection floor (3) ) on the normal axis in the middle. 2. A kind of dual-band coplanar co-aperture base station antenna according to claim 1, characterized in that: said dipole antenna (5) comprises a first dipole printed on the back side of the first dielectric substrate (4) The sub-arm (51), the second dipole arm (52) printed on the front side of the first dielectric substrate (4), the first feed circular hole (54) etched on the second dipole arm (52) , two parasitic triangular patches (53), pads (54) and the second feed circular hole (56) etched on the pads (54); the first dipole arm (51) and the second dipole arm The pole arms (52) have exactly the same size; the two parasitic triangular patches (53) are symmetrically placed and have the same size; the first feed circular hole (54) and the second feed circular hole (56) are located on the first dielectric substrate ( 4) directly above the non-metallized via (41). 3. A dual-band coplanar co-aperture base station antenna according to claim 1, characterized in that: the 180-degree feed network (9) on the front side of the printed second dielectric substrate (7) includes positively parallel double wires part (91), the first impedance transformation microstrip line (92) and the first inverted G-shaped coupling line (93). 4. A dual-band coplanar co-aperture base station antenna according to claim 1, characterized in that: the 0-degree feeding network (11) printed on the back of the third dielectric substrate (8) is the same as that printed on the second The 180-degree feed network (9) on the front of the second dielectric substrate (7) is symmetrical about the vertical axis of the feed circuit board (2); the 0-degree feed network (11) includes a negative parallel double-line part (111) , the second impedance transformation microstrip line (112) and the second inverted G-shaped coupling line (113); the positive parallel double line part (91) and the negative parallel double line part (111) are located on the reflective floor (3) Right above the third feeding hole (31). 5. A dual-band coplanar co-aperture base station antenna according to claim 1, characterized in that: the shared floor (10) printed on the front of the third dielectric substrate (8) includes a horizontal rectangular floor with a gap (102) and two short-circuit metal strips (101); two short-circuit metal strips (101) pass through the through hole (42) in the first dielectric substrate (4) by pins, the suspension patch antenna (6) The short-circuit through hole (61) is connected to the suspended patch antenna (6); the horizontal rectangular floor (102) is connected to the reflection floor (3).