4乾隆出上聯太尷尬！他妙回1句成經典 - Horn antenna

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4乾隆出上聯太尷尬！他妙回1句成經典

2022/05/13 08:26

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新奇中心／綜合報導

▲乾隆在歷史劇中的形象。（圖／翻攝自電視劇如懿傳官方微博）

對聯，是一項中文之中的藝術，詞句講求寓意、平仄、讀音等細節的整齊，正因為造句不易，誕生許多話題。喜愛寫詩與作對聯的乾隆皇帝就創作過許多作品，至於質量好不好，當時似乎也沒人敢反駁。乾隆就曾經看著外頭的雪景，冒出一句「一片一片又一片」的尷尬上聯，自己還差點接不下去，所幸在場有人「完美救援」，造就一段經典。

乾隆一生寫過超過4萬3千多首詩詞，雖然多數都沒人記得，但也能一窺，乾隆對於文字的喜愛。除了詩詞之外，乾隆也流傳各種對聯的奇聞。某個冬天，北京城下著大雪，乾隆就看著外面的雪景，冒出了一段「一片一片又一片，兩片三片四五片，六片七片八九片」，還非常陶醉地吟詩。

乍看之下，乾隆這段還真的沒什麼高深的學問，只是以數字描述漫天飛雪的情況，但群臣當然不能吐槽主子寫得太爛，全場只能一直拍手。然而，說完「六片七片八九片」之後，乾隆自己卻愣住，似乎不知道該怎麼結尾，又覺得這樣的結尾太粗糙，現場一片尷尬。

此時，有人就出來救援，冒出了一句「飛入蘆花都不見」，成了經典的收尾，也獲得乾隆大讚。至於冒出這句話的人，則有兩種說法，一派認為是清朝才子曉嵐，也有人說是清朝名士沈德潜。

HORN ANTENNA CALIBRATION

1.) The dual-polarization (HQ-Series or HR-Series) antenna has an electronic switch that may simultaneously test horizontal and vertical or +-45deg polarization, as well as a couple that can test circular polarization.
2.) The dual-polarized antenna (HQ-Series or HR-Series) is mounted on the chamber's bracket or wall (this is the way to test the antenna)
3.) If the dual-polarized antenna is being used for something else and calibration is needed, we can certainly assist.
4.)Single-polarized antennas (HA-Series, HB-Series, and other antennas) are commonly used to replace the antenna method's calibration antenna. When HA calibration is utilized, the calibration site is lost (patch loss uses a network analyzer) Enter the antenna's gain (minus the gain of the antenna, equal to the address of the object under test, return to zero)

5.) There is only one technique to compute antenna gain. The path loss patch loss subtracts the antenna's gain and substitutes the antenna under test to obtain the antenna's gain.
6.) Rotate the object under test after calculating the antenna route loss and gain calibration numbers (requires a rotating table, 2D test)
7.) If you want to read the horizontal and vertical antenna patterns at the same time with a dual-polarized antenna, an RF electronic switch, and a 3D rotating table, you can get the antenna pattern of the antenna (3D testing requires the use of HA-Series calibration twice, Horizontal and vertical or +-45deg),

8.) Antennas can be tested in a variety of methods (if you have any questions, you can provide simple photos or hand-drawn pictures, and we can assist you in the test plan)

9.) To ensure that the test value of the antenna is in compliance with international standards, all Horn products developed by FT-RF have passed internal calibration and testing in collaboration with external national research institutions, as well as third-party confirmation tests.

10.)In most ISO systems, we will demand external calibration of our test items every three years and internal self-calibration every other year. You can use the network with a set of HA-Series antennas. Calculate the path's loss using an analyzer (but usually at least three antennas can be used for internal correction, we can do internal correction by replacing the three antennas in turn)

11.)The antenna can be shipped back to Taiwan for calibration once every three years (you must know the shipping cost and the economic impact), or you can purchase a fresh set of calibrated antennas (we will calibrate the antenna internally).

11.)The antenna can be sent back to Taiwan for calibration once every three years (you must know the cost of shipping and the economic impact), or you can purchase a new set of calibrated antennas (we will calibrate the antenna internally or It is externally corrected and then sent to the customer)

12.) Antenna calibration is mostly done by an external calibration unit that must bear the ISO17025 and TAF logos.

13.)For the difference comparison test, you can use internally calibrated antennas, self-calibration, and ISO17025 antennas; this approach is frequently used in the ISO9001 series.

Double-Ridged Horn Antenna
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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 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 horn is suitable for both transmitting and receiving purposes, 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

以下內文出自: https://www.setn.com/News.aspx?NewsID=1114996

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