Product technical data
Product name:UHF slot TV transmission antenna
Equipment model: ZRUHF-FX
Equipment origin:Jiangsu
Manufacturer:Confucianism Nanjing Radio and Television Equipment Co., Ltd
ONE.Product function introduction
1.
Brief introduction of technical characteristics of decimeter wave TV slot antenna
With the development of radio and television industry, the available space position on the transmission tower is limited. More and more radio and television stations and FM stations begin to use channel synthesizers. Through the synthesizer and the realization of broadband antenna, the power radiation range is effectively improved and the maintenance cost is reduced.
Our company has introduced advanced technology from the United States, established an independent research and development center,years of work, has rich experience in the design and production of RF passive components, and the radar antenna technical staff is responsible for the design and development of products, and has a powerful microwave EDA platform to provide customized services for customers.
2.
The decimeter wave slot antenna produced by Zhongru Technology has the following characteristics:
(1)
The antenna can be made of four layers, six layers and eight layers, which can be flexibly assembled to facilitate the adjustment of antenna gain;
(2)
High-quality H62 brass waveguide, H62 brass inner conductor and silver plating treatment of inner conductor H62 brass rod greatly improve the conductivity of antenna system;
(3)
All antenna connections are welded by silver welding, which ensures the stability of antenna connecting parts and improves the transportation reliability of the equipment.
(4)
The antenna vibrator is made of brass, and the surface is nickel plated, which improves the corrosion resistance of the antenna and improves the service life of the antenna.
(5)
The antenna cover is made of glass fiber, and the outer surface is designed with streamlined round tube, which reduces the wind resistance of the antenna cover and makes the appearance more beautiful.
(6)The antenna base plate is made of 304 stainless steel to improve the strength and corrosion resistance of the antenna.
(7)
The antenna fastener and antenna are independent of each other, so the antenna can be produced on a large scale and the production cost of the antenna can be reduced.
(8)The standing wave ratio of the antenna unit board is less than 1.09 within the specified bandwidth range of 470MHz to 870MHz, which improves the standing wave ratio within the antenna bandwidth and meets the requirements for the use of digital multiplexers. The antenna bandwidth can meet the requirements of multi-channel shared antenna within 100MHz.
3.
Design principle of slot antenna
An antenna formed by a slot on the conductor surface is also called a slot antenna. The typical gap shape is a long strip with a length of about half a wavelength. The slot can be fed by the transmission line across its narrow edge, or by the waveguide or resonant cavity. At this time, RF electromagnetic fields are excited on the gap and radiate electromagnetic waves into space.
The gap on the infinite and infinite thin ideal conductive plane is called the ideal gap. The electric field on the ideal gap is perpendicular to the long side of the gap, and its amplitude decreases to zero at both ends of the gap. This electric field distribution is exactly the same as the magnetic field distribution (i.e. current distribution) on a conductor oscillator (called a complementary oscillator) with the same size.
According to the duality of the electromagnetic field, the electromagnetic field radiated by the ideal slot and the electromagnetic field generated by the complementary oscillator have the same structure, but the electric field vector of the oscillator corresponds to the magnetic field vector of the slot, and the magnetic field vector of the oscillator corresponds to the electric field vector of the slot.
Therefore, the orientation of the gap in the yz plane is 8-shaped, while the orientation in the xy plane is circular. The product of the input impedance of the ideal slot and the input impedance of the complementary oscillator is z0/4, and z0 is the wave impedance of the surrounding medium. For the actual gap on the plane or surface of a finite conductor, as long as the size of the conductor surface is much larger than that of the wave, especially the size of the narrow side of the gap is larger and the curvature is smaller, its basic characteristics will be similar to the ideal gap.
All indicators of the antenna system comply with the standards of GY/T 5088-2013 Technical Indicators and Measurement Methods for Transmission Antenna Feeder System of TV and FM Broadcasting.
Two.Technical parameters of antenna system:
1.
Frequency range: 470 - 900 MHz
2.
Polarization mode: horizontal polarization
3.
Standing wave ratio: the standing wave ratio of any 40M bandwidth within 470 - 798 MHz is less than 1.09;
4.
Gain: 12dBd
5.Impedance: 50 Ω
6.
Radiator material: aluminum alloy
7.
Cover material: 4-5mm thick fiberglass
Installation instructions:
1.Slot antenna is a single feed input mode. When connecting, it is only necessary to tightly connect the main feed pipe connector and antenna connector with screws. Note: The connection of the built-in insert must be fastened, and the waterproof ring must be placed in the card slot.
2.
The antenna must be installed perpendicular to the ground.
3.
The antenna can be installed perpendicular to the top of the tower mast, the side of the mast, the platform or the tower body of the tower.
4.
When the antenna is installed on the side of the tower body, the antenna transmitting station shall be more than 1 meter away from the reflection surface of the tower body. When the antenna is installed on the top of the tower body, it can be directly fixed with fasteners. The fasteners must be considered to facilitate the connection of the main feeder.
5.
After the main feed pipe is connected with the antenna, the outer surface must be sealed with waterproof silicone. If conditions permit, it is better to seal with heat-shrinkable pipe. To prevent water ingress.
6.
The antenna fixing screw hole is connected with the fixing fastener of the tower body. When fixing, make sure that the connectors are firm and safe. Fixing fasteners need to be customized with the size of the tower body. It is better to hot-dip galvanized or electro-galvanized where conditions permit.
Three.Antenna field pattern
Four.
Production process description of slot antenna
| product |
Material Science |
surface treatment |
technological requirements |
| Antenna housing |
No. 191 unsaturated polyester GRP material |
Surface treatment for internal and external surfaces: internal and external surfaces shall be polished and polished, and the out-of-roundness shall be less than 1mm.
The external surface shall be painted with red paint, which shall be smooth and bright. |
The surface is smooth and free of burrs and cracks |
| Antenna inner conductor |
Red copper |
The inner conductor of the antenna and the antenna waveguide are welded by silver welding to ensure their strength. After welding, they are polished, pickled and passivated, and the inner conductor of the antenna vibrator is silvered. |
The surface is smooth and clean without burr and crack, and the inner conductor is silver-plated with copper. |
| Antenna waveguide |
F5 stainless aluminum plate |
The surface is pickled and passivated, and there is no obvious discoloration, yellowing, blackening and oxidation within one year after treatment. |
The surface is smooth and free of burrs, and the connection with the antenna vibrator is stable and reliable. |
| Output feeder |
H62 brass |
The output feeder tube H62 brass is chrome plated after surface pickling and passivation. The thickness of the coating is 7 µ m. The coating is free of obvious discoloration and oxidation within one year. The inner conductor is silver plated with copper. |
The surface shall be smooth and free of burrs, and the silver welding joint shall be polished. |
| Antenna base plate |
304 stainless steel base plate |
The thickness of antenna base plate: 4mm, the plane is punched according to the drawing, and the surface is polished, polished and brushed after being processed by fitters. |
The surface shall be smooth and free of burrs, oil stains and spots. |
| Lightning arrester |
H62 brass rod |
Natural color, pickling and passivation |
The surface is smooth and free of burrs |
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