0 Introduction Superconducting technology is considered of strategic importance in the 21st century high-tech one, in energy, information, transportation, instrumentation, defense and other aspects important applications. Currently active in the world are in the application technology of superconductivity.
Superconducting filter using conductor at very low temperatures (-200 or so) when the conductor made of resistance similar to the principle of zero band-pass filter, used in mobile Communicate Base station receiver front end, significant improvements Mobile base stations Uplink performance, improve base station receiver sensitivity and lower band, the band all kinds of interference, thereby improving the signal transmission quality, extend coverage up to enhance signal transmission rate.
Of superconducting filter in TD-SCDMA base stations and other network optimization in the role of China is actively developing TD-SCDMA system and the 2G network optimization system is important.
1 mobile communications uplink and downlink analysis
1.1 Mobile communication is mainly limited by the uplink
Mobile phone base station transmit power is much greater than transmission power, and mobile phone base station receiver sensitivity and receiver sensitivity is almost the same. Therefore, mobile communication is mainly limited by the uplink, uplink coverage area are often less than the downlink coverage area.
In addition, as users continue to increase, mobile communication network is bound to increase the number of base stations. This allows access to the base station receiver interference and noise growing and increased the burden on the uplink.
1.2 to improve the general approach to the uplink
General approach to improve the uplink are: installation of the base station transmitter output cavity RF filter to suppress the base station transmitter spurious radiation. Base station receiver uses diversity reception mode, and also used in the RF input of the cavity filter to improve the receiver sensitivity and inhibit a variety of band interference.
However, the filter cavity Q value can only be reached around 5000, relatively large passband loss, stop-band attenuation is not enough, the transition zone are not steep. Therefore, this method can not effectively solve the problem uplink interference, the base station receiver in-band interference and background noise is still relatively high, the base station receiver sensitivity and capacity utilization is not high.
2 superconducting filter is the best way to solve one of the base station interference
Superconducting filter is to use conductor at very low temperatures (about -200 ) resistance is approximately zero when the surface characteristics of the filter is made, the Q value of up to 10 million, higher than the filter’s Q value cavity nearly 20 times. Therefore, the superconducting filter passband with minimal insertion loss ( 60dB) and very steep transition zone (-100dB/400KHz). After the superconducting filter
with the same working conditions in the ultra low-noise low-temperature release (LNA) (Gain: 12dB), with very low noise figure (
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