Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)"
]
}
}
以為太胖！女大生「離奇青蛙肚」稱蘋果型身材 搓澡阿姨1句話救她命 | 蕃新聞
文章出自: https://n.yam.com/Article/20231107684363The 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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以為太胖！女大生「離奇青蛙肚」稱蘋果型身材 搓澡阿姨1句話救她命
eNews新聞網/寧于晨
2023.11.07 16:29
來自中國河南鄭州的女大生靜靜（化名）有著171公分的身高，四肢纖細的她卻有著與身材不匹配的「大肚腩」，但自認為「蘋果型身材」的她對此一直不以為意，直到某次去澡堂洗澡，被搓澡阿姨提醒肚子異常不像胖的，反而「像是懷孕七個月的狀態」，就醫檢查竟是卵巢出問題，讓醫師不禁感嘆：「阿姨救了妳一命！」
▲女大生肚子大以為自己是「蘋果型身材」，直到搓澡阿姨提醒就醫，才驚覺卵巢長了一個20公分大的畸胎瘤。（圖／翻攝自廣州日報）
根據陸媒《廣州日報》報導，靜靜日前因學校檢修水電，便道市區閒晃順便到澡堂洗個澡，卻被搓澡阿姨嚴肅提醒：「別怪姨多嘴，妳這肚子不太對勁，跟四肢相比像懷孕7個月似的，不像是胖的。」Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)這讓原本半信半疑的她，決定到醫院進行檢查，結果發現自己的卵巢長了一個20公分大的畸胎瘤，必須立即進行手術切除，否則將有生命危險。
靜靜在手術後不僅成功移除了畸胎，也讓自己少掉一個肚子，就像懷孕生產完後，恢復妙齡女子的身材，她十分感激搓澡阿姨的提醒，讓她得以及時發現並治療疾病。
醫生表示，卵巢畸胎瘤是生殖細胞類的腫瘤，雖然名字為「畸胎瘤」，但與胚胎或懷孕沒有任何關係，而是卵巢的生殖細胞發生變化而引發的良性腫瘤。此外，畸胎瘤可分化成各種組織成分，囊腫裡可能會有油脂、毛髮、頭皮及骨質等成分，甚至部分還有牙齒，而這則好發於生育年齡婦女、臨床上99%為良性。
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文章出自: https://n.yam.com/Article/20231107684363The 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.