Log Periodic Antenna

記者蔡厚瑄／綜合報導

▲張育成。（資料圖／翻攝自張育成臉書）

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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.
In terms of its specification, a typical log periodic antenna might provide between 3 and 6 dB gain over dipole for a bandwidth of 2:1 while retaining a VSWR level of better than 1.3:1. 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.

EMC/EMI pre-compliance test antenna.
Very high gain over the full frequency range.
 Meets latest EMC standards up to 7GHz.
Suitable even for immunity measurements

旅美台灣好手張育成本季輾轉待過4支球隊，在本季的最後一場比賽以紅襪球員的身分結束賽季，美國職棒大聯盟自由市場開啟，各球團近日都通知不續約的40人名單成員，稍早有美媒記者在推特上爆料，張育成不會獲得紅襪隊續約，將成為自由球員。

去年張育成破繭而出，靠著春訓期間好表現擠進守護者開季28人名單，但季初他卻因確診新冠肺炎（COVID-19）被迫缺席許久月，回歸後表現不如預期，遭球隊指定讓渡（DFA），轉戰海盜後還是沒能找回好手感，後又再遭DFA，之後轉戰光芒找回好手感，但光芒迎回傷癒大物游擊後，張育成也遭到第3次DFA，最終紅襪在9月中從讓渡名單挑走他。

張育成在大聯盟年資超過3年，紅襪若是選擇和他續約，張育成將能首度獲得薪資仲裁權利，年薪將有機會上升，然而稍早《MassLive》記者Chris Cotillo指出，紅襪將以不續約（non-tender）方式將張育成釋出，確定將成為自由球員，目前人在台灣的他下一步會怎麼走，成為外界關注焦點。