Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
Log Periodic Antenna (LPDA)
文章來自: https://n.yam.com/Article/20240722121436
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.
獨家報導 記者張祥鈺／綜合報導
隨著日本旅遊的熱潮不斷升溫，越來越多的觀光客涌向這個美麗的國家。然而，近日有不少遊客反映，他們在日本消費時遭遇了「專宰觀光客」的情況，消費金額被無故多收上萬日圓。這一現象引發了廣泛關注和討論，許多曾經遭遇類似情況的過來人紛紛無奈地發出示警。
一位來自台灣的遊客李小姐分享了她在東京的經歷。她在當地一家餐廳用餐，結帳時發現帳單金額比預計高出了數千日圓。李小姐向服務生詢問後，被告知是因為附加了「服務費」和「小費」。然而，李小姐表示，在點餐時並未被告知會有這些額外費用，這讓她感到十分不悅。
根據多位遊客的反映，這種情況並非個案。一些不法商家利用語言障礙和觀光客對當地消費習慣的不熟悉，故意在結帳時加收不合理的費用。有些商家甚至會給觀光客提供與當地人不同的菜單或價格，專門針對外國遊客進行宰客行為。Log Periodic Antenna (LPDA) Log Periodic Antenna (LPDA)
曾經在日本旅遊的過來人對此現象表示無奈。他們提醒即將前往日本旅遊的朋友們，在消費前一定要仔細確認價格，尤其是在點餐和購物時，最好先問清楚是否有額外的服務費或其他隱性消費項目。他們還建議，可以事先在網上查詢一些當地的消費習慣和注意事項，避免被不法商家欺騙。
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文章來自: https://n.yam.com/Article/20240722121436
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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