isotropic antenna

1. DBMDBM is the absolute value of power. The formula is: 10lgp (power value/1 MW ).[Example 1] If the transmit power P is 1 MW, it is converted to dBm and then 0dbm.[Example 2] for 40 W power, the converted value in dBm unit should be:10lg (40 W/1 MW) = 10lg (40000) = 10lg4 + 10lg10 + 10lg1000 = 46dbm. 2. DBI and DBDDBI and DBD are the obtained Gain values (power gain). Both are relative values, but the reference standards are different. The reference of DBI is a full-direction

relaxing. The middle of the front-row central armrest is placed in the middle of the front-row seat, while the majority of the back-row central armrest is a foldable armrest, placed in the center of the back-to-back. ●Body Color It is the color of the vehicle body painted at the factory. We usually divide the color of the body into three categories: monochrome, two-color, and color trim. Currently, most cars are in a single color (also called the same color), while Mini and smart cars are in

receives the digital signal to receive the D/a transformation, becomes the analog signal. Bluetooth module BRF6100 Bluetooth signal transceiver is realized by Bluetooth module BRF6100. BRF6100 is the TI company recently introduced to follow the Bluetooth V1.1 standard wireless signal transceiver chip, its upgrade model BRF6150 support V1.2 Standard, BRF6100 main features are: Digital wireless processor in-chip DRP (Digitalradioprocessor), CNC oscillator, Chip RF transceiver switch switch, bui

channel. This frame structure is subdivided into several time slots. In the TDD mode, it is easy to switch between the upper and lower links flexibly. The salient advantage of this pattern is that the time slot allocation between the top/downlink links can be changed by a flexible conversion point to meet different business requirements. In this way, using TD-SCDMA technology, all 3G symmetric and asymmetric services can be realized by changing the switching point of the upper/down link flexibl

think that dbm is the maximum value of 0, meaning that the receiver of the transmitter launched all the wireless signal received, that is, the wireless router fired how much power, the reception of the wireless network card to obtain how much power. Of course, this is measured in an ideal state, in practice, even if the wireless network card next to the wireless router transmitter antenna will not achieve the effect of dbm 0. So the measured dbm val

one, human factors The distance between the wireless router and the network card is too long, in this case can only be solved by a different configuration of the appropriate antenna. The wireless router and the network card have the obstacle influence, sometimes also can cause the disconnection breakdown, for instance the indoor complex environment, the wall, the furniture influence. So try not to go through walls over three floors as much as possib

multi-dimensional transmission scheme: one single RF channel is used to send and receive two or more signal streams. As a result, the wireless communication system can transmit data twice or more in a channel. In the system, use more than one high-integration RF upconverter) and antenna to transmit these multiple signals, and there is also more than one high-integration RF downconverter) and the antenna to

channel. In this way, all users use the channel in the default configuration of the router, which is prone to channel interference. If nearby neighbors use the same channel as ours, our wireless signals will be affected. We can also use the Network Stumbler software for scanning to see which wireless signals exist nearby and which channel is used. Then modify our own wireless channels to avoid duplication with other channels. In addition, you should note that the signal of a channel will interf

. In this way, all users use the channel in the default configuration of the router, which is prone to channel interference. If nearby neighbors use the same channel as ours, our wireless signals will be affected. We can also use the Network Stumbler software for scanning to see which wireless signals exist nearby and which channel is used. Then modify our own wireless channels to avoid duplication with other channels. In addition, you should note that the signal of a channel will interfere with

channel in the default configuration of the router, which is prone to channel interference. If nearby neighbors use the same channel as ours, our wireless signals will be affected. We can also use the Network Stumbler software for scanning to see which wireless signals exist nearby and which channel is used. Then modify our own wireless channels to avoid duplication with other channels. In addition, you should note that the signal of a channel will interfere with two adjacent channels at the sa

one, human factors The distance between the wireless router and the network card is too long, in this case can only be solved by a different configuration of the appropriate antenna. The wireless router and the network card have the obstacle influence, sometimes also can cause the disconnection breakdown, for instance the indoor complex environment, the wall, the furniture influence. So try not to go through walls over three floors as much as possib

realized by using multiple circuits and packet switching connections on a single terminal. You can support business with different quality requirements, such as voice and packet data, and ensure high quality and perfect coverage. (2) High spectrum efficiency. WCDMA can efficiently use the radio spectrum. Since it uses single cell multiplexing, frequency planning is not required. The network capacity can be greatly improved by using the layered cell structure, adaptive

H-antenna Placement Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%lld %llu Submit Status Practice POJ 3020 Description The Global aerial Centre has been allotted the task of building the fifth generation of mobile phone Nets in Sweden. The most striking reason so they got the job, is their discovery of a new, highly noise resistant, antenna. It's called 4DAir, and comes in four types. Each type ca

) The numerical value becomes smaller, the reading and writing is convenient. The total magnification of the electronic system is usually thousands of, tens of thousands of or even hundreds of thousands of, a radio from the antenna received from the signal to the speaker sound output, a whole to zoom in about 20,000 times times. In decibels, the logarithm is taken first, and the value is much smaller.(2) convenient operation. When the amplifier is cas

PrefaceIn terms of image processing, we draw a lot of inspiration from nature, such as radiation, gravity, water, and other physics models. One of the most commonly used, it seems, is the thermodynamic model, which describes the process of heat transmission and heat balance in an abstract and concise way. This article will discuss the thermodynamic model in detail, not only exposing the beauty of mathematics, but also the beauty of nature. Directory Thermodynamic model heat transfer Law thermody

The combination of Wireless AP and wireless route is essential for network construction. For an enterprise, it is possible that a wireless LAN cannot be fully covered. It is especially important to combine Wireless AP and wireless router devices. This article provides a detailed introduction to this problem. Due to work requirements, there is now A need for both Departments A and B to connect wireless networks at the same time, but the employees of the two departments cannot access work informat

. The signal scattering from the center to the surrounding area is used. Therefore, an omnidirectional antenna is used in the selection of the antenna to facilitate signal transmission in all directions so that all directions can receive the signal. The antenna that receives wireless signals at the edge must adopt a targeted