200MHz to 3GHz Double Ridged Broadband Waveguide Horn Antenna (Upgrade version of HA-02M03G-NF)

Frequency: 200MHz to 3GHz Gain: 3dbi to 12 dBi LxWxH: 986x960x720mm N.W.: 15 KG Connector: N-type Female - Max power: 600W Connector: 7/16-Female - Max power: 3000W (The connector can be adjusted by customer needs)

The horn antenna is a broadband passive device, shaped like a pyramid horn, referred to as a TEM antenna, which guides the beam of radio waves at a precise frequency. FT-RF Double Ridged Horn antennas have frequency capabilities ranging from 400MHz to 40GHz depending on type and style. These series are characterized by a huge frequency range and extremely high input powers. With increasing frequency, the gain rises to a maximum of 18 dBi. At higher frequencies, the increased gain compensates for the increasing cable losses.

The antenna main body with the bracket using CNC precision manufacturing, and adopt a more weather resistant material aluminum material and the surface through the 6061 and 7071 Aluminum special handling to prevent oxidation.

The advantages of Horn antenna:
- Wide bandwidth: Because the horn antenna has no resonant parts, it can function over a wide range of frequencies.
- Easy waveguide interface: These antennas are very easy to interface to waveguide due to their shape, but they can also be designed with a transition so that a regular coaxial feeder can be used.
- Easy to make, simple design.
The application of horn antenna
- Antenna feeds for parabolic reflectors
- Radar systems with a short-range

The horn is suitable for both transmitting and receiving purposes. the product is especially suitable for EMC and immunity test measurements.

Recommended Accessories

- Antenna Tripod: easy and fast-changing polarisation. 100% stable handling

- SMA Cable: High-quality special SMA cable

大陸中心／綜合報導

▲唐朝嬪妃侍寢採輪流制度。（圖／示意圖／翻攝pixabay）

在歷史上，唐朝是個非常特殊的時代，其文化兼容並蓄，且透過經商、宗教交流等等，更連通了西域等大小諸國，讓唐朝境內到處可見胡人、漢人、日本人等等，融會成獨特的風景。有史學家指出，唐朝是歷代王朝以來，女性地位最高的年代，女性甚至可以離婚。而進宮服侍皇帝的嬪妃呢？據說唐中宗時期，嬪妃可以在宮外建宅單住，不必在宮裡天天伺候皇帝，更驚訝的是，每夜會有9名嬪妃「輪番上陣」侍寢，等於是人人都有份，由此可見，唐朝皇帝應該「很性福」吧？

據了解，唐朝的後宮侍寢制度，無論是時間安排，還是人員選擇，都堪稱人性化的典範，唐朝的「大明宮」規模巨大，是明清兩朝紫禁城的3倍，因此採取了品級制，例如正一品為夫人，包括：貴妃，淑妃，德妃，賢妃；正二品為九嬪：昭儀，昭容，昭媛，修儀，修容，修媛，充儀，充容，充媛；正三品為婕妤，正四品為美人，正五品為才人，這三個等級人數均為9人，合在一起統稱27世婦；正六品為寶林，正七品為御女，正八品為彩女，這三個品級的人數均為27人，合稱81御妻。

▲清朝皇帝翻嬪妃的「綠頭牌」決定誰侍寢。（圖／百度百科）

唐朝輪流侍寢制度，取消了皇帝私生活的選擇權，使每一個後宮女子，都有機會得到臨幸，伺候時間集中在晚上，為了體現人人有份，又兼顧尊卑有別，皇帝每月的夜生活安排，是按照月亮的「陰晴圓缺」來安排，每個月的前15天，月亮越來越圓，而後15天則漸漸變缺。不過在唐朝之後，宋元明清各朝代，權力均集中在皇帝手中，所以輪流侍寢制度逐漸被取消，尤其在清朝，皇帝可以根據自己的喜好，決定要翻哪個嬪妃的「綠頭牌」，使得不少女子進宮之後，終其一生也沒受到寵幸。



本文出自: https://www.setn.com/News.aspx?NewsID=1110649