CN209948044U

CN209948044U - Satellite navigation terminal antenna

Info

Publication number: CN209948044U
Application number: CN201921163072.2U
Authority: CN
Inventors: 袁家德; 巩若晨
Original assignee: Fuzhou University
Current assignee: Fuzhou Fuda Xinjie Antenna Technology Co ltd
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-01-14
Anticipated expiration: 2029-07-23

Abstract

The utility model relates to a satellite navigation terminal antenna, which comprises a first dielectric slab, a second dielectric slab, a third dielectric slab, a fourth dielectric slab and a fence-shaped dielectric slab, wherein the first and the second dielectric slabs are arranged in parallel up and down, the third and the fourth dielectric slabs are crossed and vertically arranged between the first and the second dielectric slabs, the upper surface of the first dielectric slab is printed with a radiation patch consisting of two pairs of self-phase-shifting dipole arms, the front surfaces of the third and the fourth dielectric slabs are printed with a radiation patch with dipole arms to form the cross dipole arms, the rear surfaces of the third and the fourth dielectric slabs are printed with a feeder line, the radiation patch is connected with the feeder line through a probe, the self-phase-shifting dipole arms are connected with the cross dipole arms through a probe, the lower side surface of the second dielectric slab is provided with a feed network, the feeder line is connected with the feed network through the probe, the fence-shaped dielectric slab is arranged on the periphery of the second dielectric slab, and the inner side surface of the, a plurality of gaps are arranged on the fence-shaped medium plate. The antenna structure is beneficial to enhancing the directionality and the low elevation gain of the antenna.

Description

Satellite navigation terminal antenna

Technical Field

The utility model relates to a wireless communication technical field, concretely relates to be applied to satellite navigation terminal antenna of GPS L1 and BD B1 frequency channel.

Background

Global Positioning System (GPS) has been a popular research topic due to its wide range of applications such as positioning, navigation and clock synchronization. In general, a GPS antenna requires high antenna gain for Right Hand Circular Polarization (RHCP), wide beam width, and low elevation angle. The GPS receiver needs to receive signals from at least four satellites to determine the 3D position. A broadband antenna can effectively increase coverage and receive signals even at low elevation angles. The prior art has investigated different Circularly Polarized (CP) antennas for GPS applications. For example, quadrifilar helix antennas that provide a very broad cardioid radiation pattern have been widely used. The shape of the radiation pattern can be controlled by varying the number of turns and the ratio of the length to the diameter of the helix. However, it is difficult to precisely manufacture the spiral structure. This can be a problem because its antenna performance is sensitive to manufacturing errors due to structural asymmetry and feed imbalance. Many microstrip GPS antennas have been designed in the prior art because of their low profile and simple construction. However, their beamwidths are not very wide, and their antenna gains decrease drastically at low elevation angles. For example, their elevation angle is θ = 85 ° below 0dBic, some even below-5 dBic. The prior art has disclosed CP mode diversity antennas for upper hemispherical coverage. Its omni-directional port may provide a gain θ = 90 ° of about 1 dBic, increasing system complexity due to its dual port structure. In this communication, a single-port wide-beam crossed dipole antenna with enhanced low elevation gain is studied. The antenna consists of four pairs of printed dipoles fed by two orthogonal and orthogonal currents to generate the RHCP field. The folded dipole and the ground plane may enhance low elevation gain. Low elevation gain is further enhanced by using a boxed cavity with an inclined slit. ANSYS HFSS were used to simulate an antenna, make prototypes and measure to verify the simulation. The antenna works in the GPS L1 and BD B1 frequency bands, and has good impedance matching and Axial Ratio (AR). It has a wider 3 dB AR beamwidth and 3 dB gain beamwidth. Its analog and measured antenna gain is θ = 70 ° with a right hand of 1.2dBic, higher than the negative values common in existing GPS antennas.

Disclosure of Invention

An object of the utility model is to provide a satellite navigation terminal antenna, this antenna structure are favorable to strengthening the directionality and the low angle of elevation gain of antenna.

In order to achieve the above purpose, the technical scheme of the utility model is that: a satellite navigation terminal antenna comprises a first dielectric slab, a second dielectric slab, a third dielectric slab, a fourth dielectric slab and a fence-shaped dielectric slab, wherein the first dielectric slab and the second dielectric slab are arranged in parallel up and down, the third dielectric slab and the fourth dielectric slab are crossed in a cross manner and are vertically arranged between the first dielectric slab and the second dielectric slab, a radiation patch formed by two pairs of self-phase-shifting dipole arms is printed on the upper surface of the first dielectric slab, a radiation patch with dipole arms is printed on the front surfaces of the third dielectric slab and the fourth dielectric slab so as to form a cross dipole arm when the third dielectric slab and the fourth dielectric slab are arranged in a cross manner, a feeder line is printed on the rear surfaces of the third dielectric slab and the fourth dielectric slab, the radiation patch is connected with the feeder line through a probe, the self-phase-shifting dipole arms on the first dielectric slab are connected with the cross dipole arms on the third dielectric slab and the fourth dielectric slab through a probe, the feeder network is arranged on the lower side surface of the second dielectric plate, the feeders on the third dielectric plate and the fourth dielectric plate are connected with the feeder network through probes, the fence-shaped dielectric plate is arranged around the periphery of the second dielectric plate, the inner side surface of the fence-shaped dielectric plate is a radiation surface, and a plurality of gaps are formed in the fence-shaped dielectric plate.

Furthermore, the 4 self-phase-shifting dipole arms on the upper surface of the first dielectric plate are all of a bent structure, so that the impedance bandwidth and the axial ratio bandwidth of the antenna are increased.

Furthermore, the dipole arms on the front surfaces of the third dielectric plate and the fourth dielectric plate are both of a bent structure, so that the impedance bandwidth and the axial ratio bandwidth of the antenna are increased.

Further, the radiation patches of the third dielectric plate and the fourth dielectric plate include dipole arms and radiators disposed below the dipole arms.

Furthermore, the feeder lines on the rear surfaces of the third dielectric slab and the fourth dielectric slab are of inverted-L-shaped structures, the upper ends of the feeder lines of the inverted-L-shaped structures are connected with the radiation patches through probes, and the lower ends of the feeder lines of the inverted-L-shaped structures are connected with the feed network through the probes.

Further, the feed network is implemented by a T-shaped power divider, and an edge of the feed network has a port.

Compared with the prior art, the utility model discloses following beneficial effect has: the antenna is provided with fence-shaped dielectric plates through novel structural design of each dielectric plate and dipole arms on the dielectric plates, and the directionality and the ground elevation gain of the antenna are enhanced. The antenna can be applied to the frequency bands of GPS L1 and BD B1, has good performance, good low elevation gain and good directionality, and is suitable for being applied to navigation equipment.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a diagram of a feeding network in an embodiment of the present invention.

Fig. 3 is a front view of a third dielectric plate according to an embodiment of the present invention.

Fig. 4 is a rear view of a third dielectric plate according to an embodiment of the present invention.

Fig. 5 is a front view of a fourth dielectric plate according to an embodiment of the present invention.

Fig. 6 is a rear view of a fourth dielectric plate according to an embodiment of the present invention.

Fig. 7 is a bottom view of the first dielectric plate according to the embodiment of the present invention.

In the figure, 1-first dielectric plate; 2-a second dielectric plate; 3-a third dielectric slab; 4-a fourth dielectric slab; 5-fence-shaped dielectric slab; 6-self-phase-shifted dipole arms; 7-crossed dipole arms; 8-a probe; 9-a probe; 10-a probe; 11-a feed network; 12-a feeder line; 13-a gap; 14-a radiator; 15-port.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The utility model provides a double cross broadband high-low elevation gain satellite navigation terminal antenna, as shown in figure 1, comprising a first dielectric slab 1, a second dielectric slab 2, a third dielectric slab 3, a fourth dielectric slab 4 and a fence-shaped dielectric slab 5, wherein the first dielectric slab 1 and the second dielectric slab 2 are arranged in parallel up and down, the third dielectric slab 3 and the fourth dielectric slab 4 are crossed and vertically arranged between the first dielectric slab 1 and the second dielectric slab 2, the upper surface of the first dielectric slab 1 is printed with a radiation patch composed of two pairs of self-phase-shifting dipole arms 6, the front surfaces of the third dielectric slab 3 and the fourth dielectric slab 4 are printed with a radiation patch with dipole arms to form a cross dipole arm 7 when the third dielectric slab 3 and the fourth dielectric slab 4 are crossed, the rear surfaces of the third dielectric slab 3 and the fourth dielectric slab 4 are printed with a feeder 12, the radiation patch is connected with the feeder 12 through a probe 9, the self-phase-shifting dipole arm 6 on the first dielectric plate 1 is connected with the cross dipole arms 7 on the third dielectric plate 3 and the fourth dielectric plate 4 through the probe 8, the lower side surface of the second dielectric plate 2 is provided with the feed network 11, the feeder lines 12 on the third dielectric plate 3 and the fourth dielectric plate 4 are connected with the feed network 11 through the probe 10, the fence-shaped dielectric plate 5 is arranged around the periphery of the second dielectric plate 2, the inner side surface of the fence-shaped dielectric plate 5 is a radiation surface, and a plurality of slits 13 are arranged on the fence-shaped dielectric plate.

In this embodiment, the 4 self-phase-shifted dipole arms on the upper surface of the first dielectric plate 1 are all of a bent structure, so as to increase the impedance bandwidth and the axial ratio bandwidth of the antenna. The 4 dipole arms are different in size, but are symmetrical in structure, self-phase shift of the antenna is achieved, and impedance bandwidth and axial ratio bandwidth of the antenna are increased through adjustment of the sizes of the dipole arms.

The radiation patches of the third dielectric plate 3 and the fourth dielectric plate 4 include dipole arms and a radiator 14 disposed below the dipole arms, the dipole arms on the front surfaces of the third dielectric plate 3 and the fourth dielectric plate 4 are both of a bent structure to increase the impedance bandwidth and axial ratio bandwidth of the antenna, and the radiator 14 is in a semicircular shape or other shapes. The feeder 12 on the rear surface of the third dielectric plate 3 and the fourth dielectric plate 4 is of an inverted-L-shaped structure, the upper end of the feeder of the inverted-L-shaped structure is connected with the radiation patch through a probe 9, and the lower end of the feeder of the inverted-L-shaped structure is connected with the feed network 11 through a probe 10.

The shape of the gap 13 on the fence-shaped dielectric slab 5 is not exclusive, and can be various structures such as an inclined shape, a vertical shape, a bending shape, an arc shape and the like, and the width of the gap is 4-6 mm. The fence-like dielectric plate having the inclined slot can help the antenna to achieve better directivity.

The feed network 11 is implemented by a T-shaped power divider, and the edge of the feed network 11 has a port 15.

In this embodiment, the first, second, third, and fourth dielectric slabs all adopt joint IT-8350G dielectric slabs, the rail-shaped dielectric slab adopts FR4 dielectric slab, and the inner wall of the rail-shaped dielectric slab is designed as a radiation surface.

In the present embodiment, the size of the antenna is 90mm by 70 mm. The specific size is as follows: the third dielectric plate and the fourth dielectric plate have the same height and width, the width is 50mm, and the height is 70 mm. The size of the fence-shaped medium plate is 90mm by 51 mm. The thickness of the linked metallocene IT-8350G dielectric substrate is 0.5mm, and the thickness of the FR4 dielectric substrate is 0.8 mm. The width range of the self-phase-shifting dipole arm is 1-5mm, the length of the self-phase-shifting dipole arm is the sum of three bending sections, the range of the first section is 10-22mm, the range of the second section is 10-22mm, the range of the third section is 3-12mm, and the width of a gap on the fence-shaped dielectric plate is 4-6 mm. The specific dimensions are selected according to design requirements. In this embodiment, the feed network selects the T-shaped power divider to implement circular polarization.

Above is the utility model discloses a preferred embodiment, all rely on the utility model discloses the change that technical scheme made, produced functional action does not surpass the utility model discloses during technical scheme's scope, all belong to the utility model discloses a protection scope.

Claims

1. A satellite navigation terminal antenna is characterized by comprising a first dielectric plate, a second dielectric plate, a third dielectric plate, a fourth dielectric plate and a fence-shaped dielectric plate, wherein the first dielectric plate and the second dielectric plate are arranged in parallel up and down, the third dielectric plate and the fourth dielectric plate are crossed and vertically arranged between the first dielectric plate and the second dielectric plate, a radiation patch formed by two pairs of self-phase-shifting dipole arms is printed on the upper surface of the first dielectric plate, a radiation patch with dipole arms is printed on the front surfaces of the third dielectric plate and the fourth dielectric plate so as to form a crossed dipole arm when the third dielectric plate and the fourth dielectric plate are arranged in a crossed manner, a feeder line is printed on the rear surfaces of the third dielectric plate and the fourth dielectric plate, the radiation patch is connected with the feeder line through a probe, the self-phase-shifting dipole arms on the first dielectric plate are connected with the crossed dipole arms on the third dielectric plate and the fourth dielectric plate through a probe, the feeder network is arranged on the lower side surface of the second dielectric plate, the feeders on the third dielectric plate and the fourth dielectric plate are connected with the feeder network through probes, the fence-shaped dielectric plate is arranged around the periphery of the second dielectric plate, the inner side surface of the fence-shaped dielectric plate is a radiation surface, and a plurality of gaps are formed in the fence-shaped dielectric plate.

2. The satellite navigation terminal antenna of claim 1, wherein the 4 self-phase-shifted dipole arms on the upper surface of the first dielectric plate are each of a meander-shaped structure to increase the impedance bandwidth and the axial ratio bandwidth of the antenna.

3. The satellite navigation terminal antenna of claim 1, wherein the dipole arms of the front surfaces of the third dielectric plate and the fourth dielectric plate are each of a bent structure to increase the impedance bandwidth and the axial ratio bandwidth of the antenna.

4. The antenna of claim 1, wherein the radiating patches of the third dielectric plate and the fourth dielectric plate comprise dipole arms and radiators disposed below the dipole arms.

5. The satellite navigation terminal antenna of claim 1, wherein the feeder lines on the rear surfaces of the third dielectric plate and the fourth dielectric plate are of an inverted-L structure, the upper end of the feeder line of the inverted-L structure is connected with the radiation patch through a probe, and the lower end of the feeder line of the inverted-L structure is connected with the feed network through the probe.

6. The satellite navigation terminal antenna of claim 1, wherein the feed network is implemented by a T-shaped power divider, and an edge of the feed network has a port.