Ultrashort wave broadband omnidirectional antenna

Abstract

The utility model belongs to the technical field of antennas, and particularly relates to an ultrashort wave broadband omnidirectional antenna, which comprises an upper radiator, a metal sleeve is sleeved below the upper radiator, a lower radiator is sleeved at one end, far away from the upper radiator, of the metal sleeve, the lower surface of the lower radiator is fixedly connected with a radio frequency connector, and the radio frequency connector is fixedly connected with the lower surface of the metal sleeve. The lower radiator is fixedly connected with a glass fiber reinforced plastic supporting rod which is fixedly connected with the metal flange. According to the ultra-short wave broadband omnidirectional antenna, through the arrangement of the metal sleeves, a section of metal sleeve is innovatively added to the outer rings of the upper and lower radiators of the conical oscillator and is coupled and fed with the oscillator feed point part to form a dipole sleeve type, and the conical oscillator is combined with the dipole sleeve, so that the bandwidth of the antenna is greatly improved, and the bandwidth of the antenna is greatly expanded; five octaves can be achieved, the requirement of an omnidirectional antenna is met, a high-frequency directional diagram is greatly improved, and horizontal omnidirectional radiation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, in particular to an ultra-short wave broadband omnidirectional antenna. Background Art

[0002] Cage antennas are widely used in ultra-short wave communications. Their operation is similar to that of a vertically placed dipole antenna. Compared with bottom-fed antennas, they use a mid-fed structure that is less affected by the antenna carrier and the surrounding environment and is easier to obtain impedance bandwidth and radiation pattern bandwidth, so they are widely used.

[0003] At present, most of the ultra-short wave antennas are cage-shaped biconical antennas. This type of ultra-short wave omnidirectional antenna generally has low gain and often uses loading technology to expand the impedance bandwidth. However, the directional pattern in the high-frequency band has indeed been split and concave, affecting the communication effect. At present, in mobile carrier radio stations with working frequency bands in the shortwave band, various types of whip antennas and lumped loading antennas are the most widely used. Because these antennas either have large electrical dimensions or low efficiency, they have an adverse effect on the gain of the antenna, resulting in a significant reduction in the communication effect during their use. In addition, there are also high requirements for the ultra-short wave antenna's power bearing capacity, heat loss, and signal transmission and reception efficiency.

[0004] This patent innovatively uses a conical array combined with a dipole sleeve to expand the bandwidth of the antenna, while also improving the fission of the high-frequency pattern, and has high practical value. Utility Model Content

[0005] The main purpose of the utility model is to provide an ultra-short wave broadband omnidirectional antenna, which can solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the ultra-short wave broadband omnidirectional antenna proposed in the utility model includes an upper radiator, a metal sleeve is sleeved on the bottom of the upper radiator, a lower radiator is sleeved on the end of the metal sleeve away from the upper radiator, the lower surface of the lower radiator is fixedly connected to the radio frequency connector, the lower radiator is fixedly connected to a fiberglass support rod, and the fiberglass support rod is fixedly connected to the metal flange.

[0007] Preferably, the feeding parts of the upper radiator and the lower radiator are in a double cone form.

[0008] Preferably, the metal sleeve uses a dipole sleeve form, and the current is coupled to the metal sleeve part, which can be used as a high-frequency radiator, and can further expand the antenna impedance bandwidth and gain bandwidth to optimize the high-frequency band radiation pattern and improve the lobes and depressions.

[0009] Preferably, the RF connector is connected to the coaxial line and then passes through the lower radiator.

[0010] Preferably, the braided portion of the RF connector is connected to the top of the lower radiator, with the coaxial cable in the center.

[0011] Preferably, the fiberglass support rod is arranged above the metal flange, and the fiberglass support rod and the metal flange are used to support the antenna. The fiberglass support rod plays the role of supporting the antenna. The fiberglass material has excellent corrosion resistance and anti-aging properties. It can withstand corrosion from various gas and liquid media such as acids, alkalis, corrosive organic solvents and salts to varying degrees. The metal flange can fix the antenna on the carrier.

[0012] The utility model provides an ultra-short wave broadband omnidirectional antenna. It has the following beneficial effects:

[0013] (1) The ultra-short wave broadband omnidirectional antenna innovatively adds a metal sleeve to the outer ring of the upper and lower radiators of the conical array through the metal sleeve, which is coupled with the array feeding point to form a dipole sleeve type, which can reach 5 octaves, effectively improving the split lobe and depression phenomenon in the radiation pattern, greatly improving the high-frequency radiation pattern to achieve horizontal omnidirectional radiation.

[0014] (2) The ultra-short wave broadband omnidirectional antenna expands the antenna bandwidth to 5 octaves by adopting a conical array dipole sleeve, realizing horizontal omnidirectional radiation of the antenna, which can greatly improve the communication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the standing wave diagram of the omnidirectional antenna of the utility model;

[0018] Figure 3 This is a schematic diagram of the omnidirectional antenna pattern of the utility model;

[0019] Figure 4 This is a schematic diagram of the omnidirectional antenna pattern of the utility model at 100-550MHz (3D) Figure 1 ;

[0020] Figure 5 This is a schematic diagram of the omnidirectional antenna pattern of the utility model at 100-550MHz (3D) Figure 2 .

[0021] Description of Figure Numbers:

[0022] 1. Upper radiator; 2. Metal sleeve; 3. Lower radiator; 4. RF connector; 5. Fiberglass support rod; 6. Metal flange.

[0023] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 5 The utility model proposes an ultra-short wave broadband omnidirectional antenna, including an upper radiator 1, a metal sleeve 2 is sleeved at the bottom of the upper radiator 1, a lower radiator 3 is sleeved at one end of the metal sleeve 2 away from the upper radiator 1, the lower surface of the lower radiator 3 is fixedly connected to a radio frequency connector 4, and the lower radiator 3 is fixedly connected to a glass fiber reinforced plastic support rod 5. The glass fiber reinforced plastic material has excellent corrosion resistance and anti-aging properties, and it can withstand corrosion from various gas and liquid media such as acids, alkalis, corrosive organic solvents and salts to varying degrees. The glass fiber reinforced plastic support rod 5 is fixedly connected to a metal flange 6.

[0026] In the embodiment of the utility model, in order to improve the high-frequency radiation pattern and realize horizontal omnidirectional radiation, specifically, the feeding parts of the upper radiator 1 and the lower radiator 3 are in a double-cone form, and the metal sleeve 2 uses a dipole sleeve form. The current is coupled to the metal sleeve 2 part, which can be used as a high-frequency band radiator, and can further expand the antenna impedance bandwidth and gain bandwidth to optimize the high-frequency band radiation pattern, improve the lobes and depressions, and the RF connector 4 is connected to the coaxial line and then passes through the lower radiator 3. The braided part of the RF connector 4 is connected to the top of the lower radiator 3, and the coaxial cable is centered. The fiberglass support rod 5 is arranged above the metal flange 6. The fiberglass support rod 5 and the metal flange 6 are used to support the antenna. The fiberglass support rod 5 plays a role in supporting the antenna, and the metal flange 6 can fix the antenna on the carrier.

[0027] In the present utility model, the upper and lower radiator feeding parts of the antenna are in a double-cone form, and a suspended metal sleeve 2 is cleverly added around the feeding point of the double-cone antenna. By adopting the form of a conical array combined with a dipole sleeve, the metal sleeve 2 can be used as a high-frequency band radiator after current coupling. This innovative design allows the current to be effectively coupled to the metal sleeve 2 part, thereby converting it into a high-quality radiator in the high-frequency band. This measure not only significantly broadens the impedance bandwidth and gain bandwidth of the antenna, but also plays an important role in optimizing the high-frequency band radiation pattern. The introduction of the metal sleeve 2 effectively improves the split petal and depression phenomenon in the radiation pattern, so that the performance of the antenna in the high-frequency band is comprehensively improved, and the bandwidth of the antenna of this technology is greatly improved. Figure 2 The standing wave ratio is less than 3 in the frequency band of 108-550MHz. From the radiation pattern, it can be seen that the antenna is horizontally omnidirectional, and there are no lobes or depressions in the high-frequency band, which meets the requirements of omnidirectional antennas, can improve the high-frequency radiation pattern, and realize horizontal omnidirectional radiation.

[0028] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An ultra-short wave broadband omnidirectional antenna, comprising an upper radiator (1), Features: A metal sleeve (2) is sleeved below the upper radiator (1); a lower radiator (3) is sleeved at one end of the metal sleeve (2) away from the upper radiator (1); a lower surface of the lower radiator (3) is fixedly connected to a radio frequency connector (4); a glass fiber reinforced plastic support rod (5) is fixedly connected to the lower radiator (3); and the glass fiber reinforced plastic support rod (5) is fixedly connected to a metal flange (6).

2. The ultra-short wave broadband omnidirectional antenna according to claim 1, Features: The feeding parts of the upper radiator (1) and the lower radiator (3) are in a double cone form.

3. The ultra-short wave broadband omnidirectional antenna according to claim 1, Features: The metal sleeve (2) is in the form of a dipole sleeve, and the current is coupled to the metal sleeve (2) part, which can be used as a high-frequency band radiator.

4. The ultra-short wave broadband omnidirectional antenna according to claim 1, Features: The radio frequency connector (4) is connected to the coaxial line and then passes through the lower radiator (3).

5. The ultra-short wave broadband omnidirectional antenna according to claim 1, Features: The braided portion of the radio frequency connector (4) is connected to the top of the lower radiator (3), with the coaxial cable in the middle.

6. The ultra-short wave broadband omnidirectional antenna according to claim 1, Features: The fiberglass support rod (5) is arranged above the metal flange (6), and the fiberglass support rod (5) and the metal flange (6) are used to support the antenna.

Images