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  • 062018-06
    There are two common wireless transmission antennas: indoor antennas and outdoor antennas. There are many types of outdoor antennas, such as a pot-shaped directional antenna and a rod-shaped omnidirectional antenna; a wireless antenna converts a guided wave propagating on a transmission line into an electromagnetic wave propagating in an unbounded medium (usually free space), or The reverse transformation, the components used to transmit or receive electromagnetic waves in radio equipment, are widely used in engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasures, remote sensing, and radio astronomy.
  • 062018-06
    Multiple paths are an extension of this concept. When radio communication waves are transmitted, they may be received by the receiver with more than one path. Since the reflection of other objects (such as walls and trees) forms multiple paths, the signals may come from multiple paths. Receiving signals from these sources may have a slight time difference, which means a slight phase shift may occur. When these signals are combined, they may cause "attenuation of this disappearing form. One of the worst cases is that the two signals arrive at the receiver with a phase difference of 180°, and the receiver will not be able to see any data, resulting in 100% signal attenuation.
  • 062018-06
    I believe everyone knows that gps is mainly used to receive satellite signals and then to locate or navigate the terminal products. In the process of receiving the antenna signal by gps, the antenna must be used. The GPS satellite signals are divided into L1 and L2, and the frequencies are 1575.42 MHz and 1228 MHz, respectively. L1 is an open civil signal and the signal is circularly polarized. The signal strength is about -166dBW, which is a relatively weak signal. It is because of these characteristics that it is decided that a special antenna is required for gps signal reception. So what is the role of the GPS antenna? Here I will introduce you to the role of the GPS antenna.
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