Definition

Noun: A Yagi is a type of directional antenna, typically consisting of a driven element connected to a transmitter or receiver and several parasitic elements (a reflector and one or more directors) mounted on a supporting rod. It is designed to transmit or receive radio waves very effectively in one specific direction.

Usage

The word "Yagi" is used to refer to the antenna structure itself. It is a proper noun that has become a common term in radio and telecommunications. * The amateur radio operator installed a Yagi on his roof to improve long-distance communication. * For better signal reception, the television station uses a high-gain Yagi antenna.

Advanced Usage

• Yagi-Uda antenna: This is the full technical name, acknowledging both of its Japanese inventors, Hidetsugu Yagi and Shintaro Uda. In technical literature, this term is often used interchangeably with "Yagi."
  • The design principles of the Yagi-Uda antenna are fundamental to many modern directional antenna systems.

Variants and Related Words

• Yagi-Uda antenna (n): The full name for the antenna.
• Directional antenna (n): The general category to which a Yagi belongs.
• Parasitic element (n): A key component (reflector or director) of a Yagi antenna that is not directly connected to the transmission line but influences its directional properties.

Synonyms

• Beam antenna: A general synonym emphasizing its directional, beam-forming characteristic.
• Directional array: A broader term for any antenna system designed to focus energy in a particular direction.

Related Phrases

• To point a Yagi: Describes the action of physically aligning the antenna for optimal signal strength from a specific source.
  • You need to point the Yagi precisely at the satellite for a stable link.
• Yagi gain: Refers to the measure of how effectively the antenna focuses energy in its favored direction compared to a standard antenna.
  • This model boasts a Yagi gain of over 12 dBi.

Noun

1. a sharply directional antenna