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wago kontakttechnik electrical components include single heterojunction, double heterojunction, and quantum well laser diodes. Quantum well laser diodes offer the advantages of low threshold current and high output power, making them mainstream products in market applications. Compared to lasers, laser diodes have the advantages of high efficiency, small size, and long service life, but their low output power, poor linearity, and less-than-ideal monochromaticity significantly limit their application in cable TV systems, preventing the transmission of multi-channel, high-performance analog signals. In the return path module of a bidirectional optical receiver, upstream transmission generally uses quantum well laser diodes as the light source.

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Antennas radiate radio waves and also receive radio waves. However, what the transmitter feeds into the antenna via the feed line is not radio waves, nor can the receiving antenna directly feed radio waves into the receiver via the feed line; an energy conversion process must occur in between. Below, we analyze the signal transmission process using radio communication equipment as an example to illustrate the energy conversion role of antennas. At the transmitting end, the modulated high-frequency oscillating current (energy) generated by the transmitter is input to the transmitting antenna via the feeding device (the feeding device may directly transmit current waves or electromagnetic waves depending on frequency and form). The transmitting antenna converts the high-frequency current or guided wave (energy) into radio waves—free electromagnetic waves (energy)—radiating them into the surrounding space. At the receiving end, radio waves (energy) are converted by the receiving antenna into high-frequency current or guided wave (energy), which is then transmitted to the receiver via the feeding device. From the above process, it can be seen that the antenna is not only a device for radiating and receiving radio waves, but also an energy converter, serving as the interface component between the circuit and space.

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Resolution refers to the ability of a sensor to detect the smallest change in the measured quantity. That is, if the input changes slowly from a non-zero value, the sensor's output will not change when the input change does not exceed a certain value, meaning the sensor cannot resolve this change in the input. Only when the change in the input exceeds the resolution will the output change. Typically, the resolution at various points within the full-scale range of a sensor is not identical; therefore, the maximum change in the input within the full scale that causes a step change in the output is commonly used as the indicator for measuring resolution. If the above indicator is expressed as a percentage of the full scale, it is termed resolution. Resolution has a negative correlation with sensor stability.

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1, classified by operating nature, can be divided into transmitting antennas and receiving antennas. 2, classified by application, can be divided into communication antennas, broadcast antennas, TV antennas, radar antennas, etc. 3, classified by directionality, can be divided into omnidirectional antennas and directional antennas, etc. 4, classified by operating wavelength, can be divided into ultra-long wave antennas, long wave antennas, medium wave antennas, short wave antennas, ultra-short wave antennas, microwave antennas, etc. 5, classified by structural form and operating principle, can be divided into wire antennas and aperture antennas, etc. Characteristic parameters describing antennas include radiation pattern, directivity coefficient, gain, input impedance, radiation efficiency, polarization, and bandwidth. 6, classified by dimension, can be divided into two types: (1) One-dimensional antennas consist of many wires, which may be straight lines like those used in mobile phones, or clever shapes like the old "rabbit ear" antennas used on TVs before cable appeared. Monopole and dipole antennas are the two most basic types of one-dimensional antennas. (2) Two-dimensional antennas: diverse in form, including patch (a square piece of metal), array (an organized bundle of patches in a two-dimensional pattern), horn, and dish shapes. 8, antennas can be categorized into three major types based on usage scenarios: handheld transceiver antennas, vehicle-mounted antennas, and base station antennas. Handheld transceiver antennas: these are antennas for personal use with handheld two-way radios, commonly categorized into rubber antennas and telescopic whip antennas. Vehicle-mounted antennas: these refer to communication antennas originally designed for installation on vehicles, with suction cup antennas being the most common and widely applied. Vehicle-mounted antenna structures also include shortened types, quarter-wave, center-loaded, five-eighths wave, and half-wave dipole variants. Base station antennas: play a critical role in the entire communication system, especially for communication hubs and stations. Commonly used base station antennas include fiberglass high-gain antennas, four-element array antennas (eight-element array antennas), and directional ant

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