![]() ![]() It can filter out-of-band interference and noise to meet the signal-to-noise ratio requirements of radio frequency systems and communication protocols. In the RF front-end module, the RF filter plays a vital role. On the other hand, to support a sufficient data transmission rate within a limited bandwidth, communication protocols have become more and more complex, so strict requirements have been put forward for various performances of the radio frequency system. At the same time, to meet the data rate requirements, carrier aggregation technology has been used since 4G, so that a device can use different carrier frequency spectrums to transmit data at the same time. Only then can sufficient spectrum bandwidth be allocated. Therefore, a mobile phone must be able to cover a wide frequency range, so that different people's devices can be used in crowded situations. These two issues are complementary: Due to limited spectrum resources, to meet people's demand for data rates, the spectrum must be fully utilized. Not to mention the 5G era that is entering, which requires faster and larger amounts of data transmission.Ĭorresponding to the increase in data rate is the high utilization of spectrum resources and the complexity of communication protocols. In the 4G era, applications such as live broadcast have greatly increased the bandwidth requirements of mobile phone communications, and the required data rate has reached 1MB/s. In the 3G era, with the popularity of smartphones, the use of operators’ networks to send and receive emails, and the use of various apps have resulted in a dramatic increase in network traffic. In the 2G era, only a small number of people will use their mobile phones to surf the Internet and browse the WAP version of the web, and the required data rate is about 1KB/s. With the development of wireless communication applications, people have higher and higher requirements for data transmission speed. RF front-end modules generally include antenna switches, multiplexers, filters, power amplifiers, and low noise amplifiers, and so on. For example, a newer mobile phone needs to support at least 3G, 4G, 5G and WiFi, GPS, and other network standards, and each standard requires its RF front-end module. The filter is a passive circuit, and after proper design and setting, it can produce microwave radio frequency filtering.Īs mobile devices become more powerful and support more and more network frequency band, RF front-end modules have become an indispensable part of mobile devices. #LOW PASS RF FILTER DESIGNER SERIES#Paint is gray epoxy enamel for the C70L Series and high-temperature black for the C70LH Series.In microwave communication systems, such as radars, test, and measurement systems, etc., microwave radio frequency filters are the key electronic components. Connector shells are passivated stainless steel. They are also used in signal processing, individually and in more complex assemblies, to separate various frequencies.įilter housing is aluminum with chromate conversion finish per MIL-C-5541, Class 3. Low pass filters are recommended at the output of broadband RF sources and in test set-ups to eliminate undesired harmonics and other spurious outputs for increased measurement accuracy. The low and high-power models listed below represent a practical compromise between selectivity, loss, length and upper frequency limit for general laboratory use, although other combinations of characteristics may just as easily be made to fit your exact requirements. M.E.C.’s C70LH Series filters are high power versions of the C70L Series and are limited only by the power capability of the coaxial connectors used. The stop band is reflective and extends from the cutoff frequency Fc to an upper frequency limit beyond which the transmission line becomes over-moded allowing possible spikes or holes in the rejection response. However, more elements also increase passband insertion loss and filter length. The number of elements determines the sharpness of the skirt and rejection level. ![]() They consist of stepped-impedance, semi-lumped elements in a low-loss air or dielectric transmission line. ![]() M.E.C.’s C70L Series are tubular low pass filters of Chebyshev equi-ripple design. ![]()
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