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Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
大韓航空一架22日從仁川飛往台中的班機，起飛約50分鐘後增壓系統出現問題，臨時返航仁川，不過下降過程導致15名乘客耳膜疼痛及過度換氣，最終有13人送醫。（資料照：shutterstock／達志）
本文引用自: https://www.chinatimes.com/realtimenews/20240623000804-260408
The Log Periodic Antenna as known as LPDA is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies.
Both Log-Periodic Antennas and Yagi antennas are high gain directional antennas. The main difference between these antennas is that Log-Periodic Antennas support wider frequency bandwidths and are physically much larger than Yagi antennas.
The log-periodic dipole array typical VSWR is 2:1 and operates over a much wider bandwidth and will have a lower gain for an equivalent number of elements.
With this level of performance, it is ideal for many applications, although a log-periodic antenna will be much larger than a Yagi of an equivalent gain.
大韓航空「飛台中」波音班機空中異常！緊急返航13人送醫
大韓航空一架昨（22）日下午從仁川飛往台中的波音客機，起飛約50分鐘後增壓系統出現問題，客機臨時返航仁川，於晚間7時38分順利落地。不過客機返航、下降過程導致15名乘客耳膜疼痛及過度換氣，最終有13人送醫。
綜合韓聯社、亞洲經濟（아주경제）報導，大韓航空編號KE189、機型為波音737-8型的客機當地時間昨日下午4時45分從仁川國際機場起飛前往台中，不過客機在濟州島上空時突然偵測到增壓系統有問題，此時客機已啟程約50分鐘。
增壓系統主要調節機艙內部壓力，客機決定返航仁川，並於晚間7時38分順利落地。
這架客機一共載有125名乘客，南韓國土交通部表示，客機下降過程中有15名乘客耳膜疼痛及過度換氣，落地後有13人送醫，所幸沒有人員重傷。
大韓航空預計當地時間今（23）日上午10時30分執飛另一架飛機，將乘客載往台中。
本文引用自: https://www.chinatimes.com/realtimenews/20240623000804-260408
The Log Periodic Antenna as known as LPDA is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies.
Both Log-Periodic Antennas and Yagi antennas are high gain directional antennas. The main difference between these antennas is that Log-Periodic Antennas support wider frequency bandwidths and are physically much larger than Yagi antennas.
The log-periodic dipole array typical VSWR is 2:1 and operates over a much wider bandwidth and will have a lower gain for an equivalent number of elements.
With this level of performance, it is ideal for many applications, although a log-periodic antenna will be much larger than a Yagi of an equivalent gain.
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