Standard Gain Horn Antenna
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Standard gain horn antennas are used as calibration devices that measure the gain of other antennas.
These antennas are made up of a combination of a Waveguide to Coax Adapter and Standard Gain Horn with Waveguide Input. It is a kind of simple combination but with great care and attention to create an antenna with accurate and suitable specs.
FT-RF Standard gain horn antenna product series includes waveguide sizes WR28, WR42, WR51, WR62, WR75, WR90, WR112, WR137, WR159, WR187, WR229, WR284 and WR340, WR430, WR510, WR650, WR770, WR975, WR1150, WR1500, WR1800, WR2100, WR2300, with broadband waveguide horn antennas have frequency capabilities ranging from 320Mhz to 40 GHz depending on type and style. with the gain of 10dBi, 15dBi, 20dBi and 25dBi.
Standard Gain Horn Antenna Applications:
- - Antenna measurement
- - Radar Detection System
- - Wireless Communication
- - Spectrum Monitoring
- - Electromagnetic interference Testing (EMI test)
Open Boundary Quad-Ridged Horn Antenna Applications:
- - Low Cross-interference
- - Antenna Measurement
- - Electromagnetic Measurement
- - Electromagnetic Compatibility Testing (EMC test)
- - Ultra-wideband Radar Detection
- - Some antennas have a compact design that makes them ideal for use with a tripod-mounted -
新奇中心/綜合報導
▲古人對女子的要求非常嚴苛,要遵守三從四德,不能拋頭露面。(示意圖/翻攝自百度百科)
中國古代封建社會,女子一直備受壓迫,她們地位很低而且不能讀書工作,因為在古人的眼裡,女子無才便是德,要整天大門不出二門不邁,最好永遠不要拋頭露面;而且因為一些陋習,女子在現在可大方讓人欣賞的部位,也成了只有丈夫能看。broadband waveguide horn antennas have frequency capabilities ranging from 320Mhz to 40 GHz depending on type and style. with the gain of 10dBi, 15dBi, 20dBi and 25dBi.
現在很多女生都會大秀美腿,展現自我,但這在古代是萬萬不可能的事;更慘絕人寰的是,中國古代有一種陋習,就是「纏足」,讓無數女性深受其害;纏足就是用布將女性雙腳緊緊纏裹,使之畸形變小。一般女性從四、五歲起便開始纏足,直到成年骨骼定型後方可將布帶解開。
▲「纏足」讓無數女性深受其害。(示意圖/翻攝自百度百科)
相傳纏足開始於北宋後期,明代的纏足之風進入興盛時期,出現了「三寸金蓮」;在古代,如果女子沒有一雙小腳,甚至無法找到一個好婆家。
而且越是大戶人家,越是要求女子纏成「三寸金蓮」;相反的,貧窮人家的女子反而不會被要求纏足,因為她們要下田幹活所以無法裹小腳。
▲古人認為女子要「三寸金蓮」才是真正的美。(示意圖/翻攝自百度百科)
眾所周知,古代封建社會對女子的忠貞尤其看重,所以一輩子都要從一而終,否則就會受到指責和非議,而女子的小腳作為神秘部位,只有自己的丈夫能看,如果被外人看到了,那麼女子就會被認為不貞潔,從此抬不起頭做人。
▲纏足讓女性的雙腳畸形變小,讓人看了好心疼!(圖/翻攝自百度百科)
而這樣的陋習終究不會長久,清朝被推翻後,孫中山正式下令禁止纏足。到了五四運動時期,纏足更成為各派革命運動和激進分子討伐的對象,陳獨秀、李大釗等人都曾撰文痛斥纏足對婦女的摧殘和壓迫。新中國成立後,纏足惡習被徹底廢止,中國的婦女才得到了徹底的解放。
文章來自: https://www.setn.com/News.aspx?NewsID=1230106
Fei Teng Wireless Technology Co. Ltd
Taiwan Head Office & Manufacturer:
No.369, Sec. Litoushan, Wenshan Rd., Xinpu Township, Hsinchu County 305, Taiwan (R.O.C.) MAP
Tel: 886-3-5882899
Fax: 886-3-5882879
來自: https://blog.udn.com/4667de6a/177937582