UIY was established in 2003 in Shenzhen, China, with the registered capital of 200 million yuan (about 32 million dollars). It is an integrated enterprise, which includes research, production, marketing and service for the civilian and military microwave communications device. The products are sold all over the world. Relying on industrial advantages and excellent professional skills, UIY won reputation and public praise in the microwave communications industry under experienced domestic and international operation mode.
Recently, it was learned from the Shenzhen Bureau of Industry and Information Technology that as of now, the number of 5G base stations in Shenzhen has exceeded 70,000, and the number of 5G users has exceeded 13 million. With its 5G network coverage density and user proportion rank among the top in major cities, It provides a solid support for the high-quality development of Shenzhen's digital eco......Detail
In last article, we introduced the concept and common applications of the POI system. This article will focus on the POI system design and product features.
The common design of POI System：
1) Two-way co-channel mode for signal sending and receiving.
2)One-way split mode for signal sending and receiving.
POI system product features:
POI is the abbreviation of POINT OF INTERFACE, that is, a multi-system integration platform. It is mainly used for multi-band and multi-signal combination to achieve compatible coverage of multi-network signals. It realizes multi-system, multi-band signal transceiver and cable transmission: and is able to meet the versatile requirements of DTV, 2G, 3G, 4G, 5G (can support LTE MIMO) etc.
The LC filter is a filter composed of appropriate capacitors and inductors. It could be designed to realize low-pass, band-pass, high-pass, and band-stop filters.
Pros: Small size, low cost, long parasitic passband
Cons: The insertion loss is high, the out-of-band selection performance is poor, and the power capacity is small.
In addition, the inductance in the LC filter ado......Detail
In last article, we introduced the basic concepts of filter. Today, we’d like to discuss further about the RF characteristics of the filter and how it defines its performances.
Usually, the RF characteristics used to describe the filter performance are:
Absolute bandwidth / Relative bandwidth
Ripple in ......Detail
The RF filter is one of the essential key components in the radio frequency system. It is mainly used for frequency selection---letting the required frequency signal pass and reflecting the unwanted interference frequency signal.
A classic example of a filter application is a receiver or transmitter front end, as shown in
Figure 1: Receiver RF Front-End
As can be seen from Figure 1, t......Detail