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작성자카니발 조회 10회 작성일 2021-01-13 23:27:09 댓글 0

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Antennas: Omni vs Yagi

https://www.rspsupply.com/c-1474-antennas.aspx

When trying to communicate over long distances, using communication cable can be expensive and impractical. In these cases, it is common to use industrial communication radios. These radios require the use of an antenna to transmit and receive data to and from other locations. The two most common types of antennas used in these applications are either Yagi antennas, or Omni antennas. Today we will talk about the differences between the two, and why we might use one antenna vs the other.

Yagi Antennas (aka Directional/Uni-directional)
- Directional antennas that can transmit and receive data coming from a specific direction (the direction the antenna is facing). Thus, directional antennas must be aimed in the direction of the potential signal transmitter(s)
- Aiming the antenna correctly is essential for optimal reception.
- Knowing the width of the antenna's signal pattern is the best way to ensure optimal aim. One way is to judge this is by its dBi rating. The higher the dBi rating the narrower the reception cone. And the more concentrated the signal.

Advantages and Disadvantages
• Ability to communicate from longer distances
• Can get better signal strength
• Requires more adjustments to get good communications between antennas
• Uni Directional means limited communication for each antenna

Typical use case… remote locations

Omni Antennas (aka Omni-directional)

- Omni-directional antennas can pick-up signals coming from all directions. They are most commonly used for signal reception over a large area where the potential location of any incoming signal's transmitter varies. Therefore, unlike Yagi antennas, Omni antennas do not need to be pointed to a particular direction since their antenna pattern is 360°.
- Each specific antenna has a gain rating or dBi (decibel isotropic) number which coincides with the performance of the antenna.
- Note that: the higher the dBi rating = larger area covered

Advantages and Disadvantages

• Easy setup and install
• Can send and receive signals from multiple locations with just one antenna
• Limited on the distance it can communicate
• Not a great option from areas with poor signal strength

• Typical use case… Master Stations that receiver multiple signals from all different locations.

Conclusion
• The location you need to install your radio can help you determine what type of antenna will work best for that application.
• Yagi Antennas = more adjustments, strong signal strength from greater distances.
• Omni antennas = little if any adjustments, easy to set up limited range, but can talk in all directions.

Omnidirectional vs directional antennas what's the difference? | weBoost

*** It is with sadness that we share that Don, the person featured in this video, passed away in December 2017. Don was a Navy veteran and a valued member of our product engineering team since 2004. He will be greatly missed.

Think you know your antennas? What's the difference between an omni antenna and a directional antenna? What's a Yagi antenna? And which antenna makes the best Wi-Fi antenna, or TV antenna or cell phone antenna?

Like most things, it depends on your situation. The guy with the answers is Don the Antenna Engineer from weBoost. In this 6-minute video he explains how directional antennas work and how they differ from omnidirectional antennas.

To learn more about signal boosters visit https://www.weboost.com/us/

We're here to answer all of those questions for you. Do you need an antenna for your car, truck or RV? Or is this an antenna for your home or business?

In short an omni antenna gathers signal from all around it so no matter where the cell tower is your antenna will find the signal and connect with it. A directional antenna captures signal only in the direction it is aimed. The directional antenna is stronger but you need to spend a little more time up front pointing it where the cell tower is located.

We go into more detail and explain the radiation patterns of each type of antenna, what radials are, and antenna design.

Feel free to leave us any questions you have in the comments.

Read more on our blog: https://www.weboost.com/us/news/blog/what-is-a-yagi-antenna/

안테나 방향조정이 필요 없는 선박용 지상파 DTV 수신안테나 '옴니-빔' 출시

지상파 DTV 수신안테나 제조업체인 (주)스펙트럼통신기술(대표 김태하, www.spectrum.co.kr)은 그간 전량 수입에 의존하고 있던 선박용 지상파 DTV 수신안테나 '옴니-빔(Omni-beam)'를 국내 최초로 개발하고, 6월부터 국내외 출시한다고 밝혔다.\r
\r
이번에 개발한 안테나는 근해를 항행하는 선박에서 지상파 HDTV 방송을 쉽게 수신할 수 있을 뿐만 아니라, 주택의 옥상이나 아파트 베란다 등 어디든 설치할 수 있다.\r
\r
현재까지 사용하던 안테나는 송신소 방향으로 안테나를 지향해야만 수신이 가능했으나, 본 개발제품은 안테나 방향조정이 필요하지 않는 스마트 스타일의 차세대 DTV 안테나이다.

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