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In broadcast engineering, a panel antenna is a directional antenna that is widely used to obtain a wireless Internet connection.
Directional antennas receive and broadcast a signal in only one direction, resulting in better signal quality.
Panel antennas, for example, are used in underdeveloped countries to improve the range and functionality of wireless Internet networks.
A panel antenna is shaped like a panel and is typically fixed on a mounting bracket on the exterior or inside of a building. It can also be mounted on a swivel mount, allowing the user to adjust the antenna for optimal signal reception. This type of antenna is usually one-directional, with less mobility side-to-side and up-and-down than an omnidirectional antenna, which can swivel and entirely change its location. Two U-bolt brackets and waterproof were supplied in one piece of packing
記者谷庭/台北報導
▲ 建議安卓用戶盡快檢查手機。(圖/資料照)
安卓手機用戶注意,快檢查你有沒有下載到這款App,因為根據外媒《ZDNet》報導,法國資安公司Pradeo發現,有一款名稱為「Facestealer」的照片編輯 App,裡面藏有木馬程式,會竊取用戶的Facebook 密碼還有信用卡卡號。
雖然現在Google 已經下架「Facestealer」這款App,但過去七年它只是不斷變成另一種App,裡頭一樣藏有木馬程式,一樣輕鬆取得用戶資料,並把資料傳到位在俄羅斯的一個伺服器。而當用戶不小心下載這個App後,就會需要帳號登入,裡頭也有使用 Facebook 帳號登入的選項。
所以當用戶點選登入後,這個網頁其實是個釣魚網路,盜取用戶的 FB 帳密。目前該款App已有約 10 萬名用戶下載。建議安卓用戶都檢查一下手機,看有沒有不小心下載到這款App,並且平時應盡量在 Google Play 上下載第三方程式,平時下載前也可以多注意留言,避免下載到不良的 App。
700MHz to 8GHz Double Ridged Broadband Waveguide Horn Antenna version 2
Model No: HA-07M08GA2-NF
Frequency: 700MHz to 8GHz
Gain: 6 dbi to 17 dBi
LxWxH: 661x430x445mm
N.W.: 8.1kg
-3dB Beamwidth: Horz.26 Deg Vert.34 Deg
Double Ridged Horn Antenna
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The horn antenna is a broadband passive device, shaped like a pyramid horn, referred to as a TEM antenna, which guides the beam of radio waves at a precise frequency. FT-RF Double Ridged Horn antennas have frequency capabilities ranging from 400MHz to 40GHz depending on type and style. These series are characterized by a huge frequency range and extremely high input powers. With increasing frequency, the gain rises to a maximum of 18 dBi. At higher frequencies, the increased gain compensates for the increasing cable losses.
The advantages of Horn antenna:
- Wide bandwidth: Because the horn antenna has no resonant parts, it can function over a wide range of frequencies.
- Easy waveguide interface: These antennas are very easy to interface to waveguide due to their shape, but they can also be designed with a transition so that a regular coaxial feeder can be used.
- Easy to make, simple design.
The horn is suitable for both transmitting and receiving purposes, especially suitable for EMC and immunity test measurements.
Recommended Accessories
- Antenna Tripod: easy and fast-changing polarisation. 100% stable handling
- SMA Cable: High-quality special SMA cable
本篇文章引用自此: https://attach.setn.com/newsimages/2022/02/08/3520606-XL.jpg
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