Last year we reported on the luxury yacht Yacht Yacht A, which belongs to the Russian billionaire Andrey Igorevich Melnichenko. This is currently the world's most luxurious San Francisco yacht, with a total cost of US$450 million (about 3.087 billion yuan).
According to reports, this 468-foot-long yacht has eight floors, one of which has a helipad and an underwater observation room. The interior can accommodate 20 guests and 54 crew members. Cabin zoning planning, each functional room are luxuriously decorated.
Motor Yacht A's power is derived from a diesel hybrid system or unpowered drift by sea breeze. The cruising speed is 18mph and the maximum speed is 24mph.
The $450 million is just the initial cost of the ship. In the future, the owner of the ship will pay about $1 million for the maintenance of the ship and the wages of the employees on board.
At present, Motor Yacht A is parked in a shipyard in northern Germany. It will set off from here after the final commissioning and begin its own maiden voyage.
Definition and Basic Characteristics
The Parabolic Dish Antenna, shaped like a parabola, is inspired by the principle of parabolic reflectors in optics. This antenna focuses radio waves onto a single point through its parabolic reflector, thereby enhancing signal strength and directionality. Parabolic Dish Antennas are widely used in microwave communications, satellite communications, radio telescopes, and radar systems.
Classification Criteria
Parabolic Dish Antennas can be classified based on their purpose, size, frequency range, and design characteristics.
Classification by Purpose:
Microwave Communication Antennas: Used for microwave relay links, enabling telephone, television signals, and wireless WAN/LAN data communication between cities.
Satellite Communication Antennas: Part of satellite ground stations, used to receive and transmit satellite signals.
Radio Telescope Antennas: Employed in astronomical observations, collecting faint radio waves from deep space.
Radar Antennas: Utilized for detecting and locating ships, aircraft, missiles, and other targets.
Classification by Size:
Depending on the diameter of the parabolic reflector, Parabolic Dish Antennas can be categorized as small, medium, and large. Small antennas are suitable for households or small base stations, while large ones are commonly found in satellite communication stations and radar systems.
Classification by Frequency Range:
Parabolic Dish Antennas can be designed to cover different frequency ranges, such as UHF (Ultra-High Frequency) and SHF (Super-High Frequency), to meet various communication needs.
Classification by Design Characteristics:
Cassegrain Antennas: Designed to eliminate the blockage and reflection of radio waves by the sub-reflector, enhancing antenna efficiency.
Offset Antennas (e.g., Offset Gregorian Antennas): Optimize antenna performance by altering the position relationship between the feed and the reflector.
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Yetnorson Antenna Co., Ltd. , https://www.yetnorson.com