pigtail antenna

overlapping frequencies, and can even theoretically overlap to an infinite number. However, to increase the sensitivity of demodulation, LTE currently supports half of the overlapping wavelength of OFDM. MIMO In fact, one of the important reasons why LTE abandoned CDMA in the Early Days was that CDMA had poor support for MIMO, while the sub-carrier data used by OFDM was converting serial data into parallel data, parallel data can be well adapted to MIMO reception. (For the reason why CDMA is no

Wireless Networks are no stranger. Laptops and smartphones can all access wireless networks. This is what we often do in our lives, however, many people may encounter various usage errors when using wireless networks. I. The main factors affecting the wireless network are transmit power, accept sensitivity, and antenna gain. Currently, the main trend of wireless networks is in signal coverage and transmission rate, generally, the method to enhance the

radiation coupling. Transmission must have a complete circuit connection between the interference source and the sensor. Interference signals are transmitted along the connection circuit to the sensor. This transmission circuit can include the power supply, public impedance, grounding flat, resistance, inductance, capacitance and mutual inductance of wires, conductive components of the equipment. Radiation transmission is carried out in the form of electromagnetic waves, and the interference en

the user's device. The ground monitoring system of GPS working satellite includes one master station, three injection stations, and five monitoring stations. GPS signal receiver the task of GPS signal receiver is to capture the signals of the satellite to be tested selected based on the cutoff angle of a certain satellite height and track the operation of these satellites, transform, zoom in, and process the received GPS signals to measure the transmission time of GPS signals from the satell

example, some users put a wireless router near the microwave, and found that when the microwave oven work, the wireless network will appear inexplicable network failure, and the microwave after the network back to normal. Small fat found a lot of colleagues in the use of walkie-talkie, and in the intercom "harassment", the wireless network will naturally be affected. Therefore, it is also necessary to keep the "purity" of the wireless network environment as much as possible. Xiao Fat reminds

radiation transmission mode. Therefore, from the disturbed sensors, the interference coupling can be divided into two kinds: conduction coupling and radiation coupling. The conduction transmission must have a complete circuit connection between the jamming source and the sensor, and the jamming signal is transmitted to the sensor through the connection circuit, and the interference phenomenon occurs. The transmission circuit may include a conductor, a conductive component of the equipment, a p

meters, outdoor farthest not exceeding 50 meters. In addition, the antenna with high gain can be considered to solve this problem. Because of its no directionality, omni-directional antenna is used in the central station of point-to-point communication. Directional antenna has the maximum radiation or receiving direction, so the energy concentration, the gain r

price is hard to accept. However, it should be emphasized that each product has its own market positioning, wireless packages are mainly facing the "impoverished" of the primary users. Those who already have a certain basis to buy wireless package although some inconvenience, but not necessarily spend money. Here is a kind of practice is worth learning: in the market to find a "like-minded" friends, two people need to buy a set of wireless package. Contact each other before you break up so tha

machines use two PRISM chip-based 802.11b wireless NICs. Although many tools (such as Kismet) used in subsequent operations can support a wide range of wireless network adapters, we recommend using a PRISM 2 Chip-based network adapter, this chip can be supported by all the tools we need to use during the cracking process.Wireless NICs generally have two types of antennas: External antennas and built-in antennas. If the purchased wireless NICs do not have built-in antennas, you must purchase ano

, flexible compatibility with desktop and laptop, this is the greatest temptation. We recommend that you do not consider the SD interface or Express card interface products for the time being. SD-interface wireless NICs require devices to have SDIO interfaces, which are only supported by a few PDAs and are expensive. As for the Express card interface, although it does not doubt the long-term trend of replacing the PCMCIA Interface, at least it is too advanced. Option 2 for wireless network adap

is a little troublesome to remove the palm tray. First, remove all the No. 4 screws at the bottom of the fuselage and all the No. 1 and No. 2 screws at the front of the fuselage. You can then open the palm tray with a slight force on the right of the front, you can see the wireless network card expansion slot, load the built-in wireless network card and connect to the antenna, and then install the palm and keyboard in sequence. Other brand models can

into different areas of the class so that everyone can feel warm. Therefore, the size of the micro base station is much smaller than that of the macro base station, and the power consumption is also reduced. You may want to ask, why are the antennas of macro base stations so large and the antennas of micro base stations so small? Or, why do we have to use long antennas for our mobile phones, but now we have no antennas? Relationship between antenna

introduce how to disassemble the keyboard and palm rest-first remove the four No. 3 screws at the bottom of the fuselage, then flip the fuselage and push the keyboard forward, the keyboard will jump out of the body. Unplug the data cable from the interface on the motherboard, and the entire keyboard is completely detached. Be sure to note that there is a data cable under the keyboard connected to the motherboard, must be gently forced, so as not to break. It is a little troublesome to remove th

Protecting our wireless networks to the maximum extent is a matter of great concern to us. From which aspects should we manage and set them? Here we will introduce it to you. The purpose of reasonably protecting wireless access points is to isolate wireless networks from outsiders who are not authorized to use services. It is often easy to do. In terms of security, wireless networks are usually more difficult to protect than fixed wired networks, because the number of fixed physical access point

psmp-dtt1 moment), and then sequentially send the node corresponding to the buffer broadcast frame, here PSMP-DTT time, the inter-frame interval can be used rifs, in order to achieve higher efficiency. For the ACK part, because the author did not do the detailed textual research, so did not describe. When the PSMP-DTT time is over, the node sends a data frame, such as STA1, to send the upstream data in the PSMP-UTT1, in turn, within its corresponding upstream dispatch cycle. When the Psmp-utt t

Because a desktop with a wireless network card is equipped with a black wireless network card antenna, you must connect to the wireless network card antenna before normal wireless Internet access.Solution:1. Check that the wireless Nic Antenna interface behind the host is not connected. The Wireless NIC antenna comes s

is surrounded by peripheral devices such as capacitors, resistors, etc. that are required for the chip to work properly. The yellow serpentine pattern on the left is the PCB antenna. It is a way of using the wires on the printed circuit board as an antenna. The advantage of this antenna is that it is smaller and cheaper than the external

send data to the reader. The data includes not only the ID (globally unique ID), but also the data pre-existing in the eeprom of the label. Because passive tags have the advantages of low price, small size, and no power supply. RFID tags in the market are mostly passive. Semi-active Generally, a passive tag antenna has two tasks: first, to receive the electromagnetic wave sent by the reader, to drive the tag IC; second, to return the signal from the

there are tags nearby. RFID is usually called a near-pairing system for communication at a very close distance. The range of near-pairing systems is usually 0 to 1 cm. This means that the tag is appended to the reader or pressed to the reader. The advantage of this close distance is that the label battery plant can produce a lot of energy. This energy is sufficient to support tag communication without the need for Built-in power. Near-matching is also conducive to highly confidential occasions.

, and the distance from the battery should be far enough. HW also requires that the Id be placed near the antenna without metal accessories. We can imagine that the manufacturing cost of a mobile phone with a built-in antenna is 20-25% more expensive than that of a mobile phone with an external antenna. The main factor is the design of the