FT-RF specializes in producing:
- Military Antennas (Jammer Antenna, Military Horn antenna, Military vehicle antenna, Antenna Telescope Mast, Marine, Panel, Log Periodic antenna, Gooseneck, Whip, GPS, Connector, Adapter...) Please visit the website: https://military.ft-rf.com.tw/
- Outdoor Antenna and Indoor Antenna: Including Lora Antenna, ISM, LPWA antenna (868MHz antenna aka EU868, 915MHz antenna aka US915, 923MHz antenna aka AS923 and others.), 4G LTE antenna, 5G antenna, Wifi Antenna, Multi-Frequency Antenna, UHF antenna..., RF components, Cables and Connectors. We offer a variety of high-performance antennas for Global LoRaWAN applications, including 868 MHz, 915 MHz, 868 MHz, and 923 MHz... Our product line comprises both durable outdoor antennas and indoor high-performance dipole antennas that are suitable for a variety of LoRa applications, including Helium Network support. Please visit the website here: https://ft-rf.com.tw/.
- Horn Antenna: RF Microwave Antennas, EMC test equipment (Double Ridged Horn Antenna, Open boundary double ridged horn antenna, Quad Ridged Horn Antenna, Standard Gain Horn antenna, Waveguide to coax Adapter, precision Sleeve Dipole Antenna, Log Periodic Antenna, Antenna Tripod, RF connectors... Please visit the website: https://horn.ft-rf.com.tw/
We provide measurement and calibration Tests, ODM, OEM services for certain products.
We have hundreds of customers from over 60 countries, and to meet their demands, we developed a plant in Vietnam (with a total infrastructure area of 10000 square meters, which includes three major buildings dedicated to operations and production) in addition to the main manufacturing facility in Taiwan. Now, we are focusing on automatic production lines and investing in automation equipment. In the future, we pledge to deliver the highest-quality product in the shortest possible period.
▲塑膠椅子中間的圓形孔洞，除了當把手外還可以釋放壓力。（示意圖／取自Shutterstock）
塑膠椅輕便好收納，可以隨時搬到聚會場所使用，不用時也可以全部堆疊起來不佔空間。而近日有網友好奇發問，塑膠椅中的孔洞，除了拿來當把手好拿取外，是有什麼特殊功能嗎？貼文一出也引來內行人解釋其原理，除了好拿取外，也是為了堆疊時可以輕易放平整。
根據原PO於《你現在在幹嘛》臉書社團好奇發問，表示自己坐了幾十年的塑膠椅子，而每一個中間都有圓形孔洞，想請問網友知不知道中間的孔洞是幹嘛用的？
熱心網友也解答「疊起來再拿時，要有洞壓力才會平衡」、「方便拿，還有堆疊時方便排氣沒錯」、「堆疊時才不會被真空吸住拔不起來」、「椅子疊放在一起的時候；中間有個洞；才比較好拿起來」。
▲塑膠椅子的孔洞除了方便拿取外，也可以讓椅子更容易堆疊整齊。（示意圖／取自unsplash）
實際上該原理近似於「馬德堡半球實驗」，雖然自然堆疊起來的椅子中間不會是真空，但被拉開還是會形成類似的效應，導致想要分開兩張椅子時需要很強的力道，因此中間的圓形開孔不光是為了能夠成為把手，而是為了消除真空讓堆疊的椅子容易分開，以及適當的釋放壓力後，堆疊時就能夠輕易地擺放平整。（編輯：鍾怡婷）
1mhz to 70ghz antenna Antenna development and manufacturing
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