RF1404D Filters

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Surface Acoustic Wave Filters (SAW) are usually used in electronic circuits that require particularly high rejection functionality and a narrow bandwidth. The RF1404D is a SAW filter that provides high rejection performance in wide temperature range of -40°C~+85°C with both SSB and high Q characteristics. It is a part of a family of devices that are designed to provide superior out-of-band rejection levels.

The RF1404D is a band-pass filter with a bandwidth of 1.3 GHz at IF/RF center frequency of 1.5 GHz, and has a rejection of greater than 35dB. It has a frequency range of 1250MHz to 1750MHz with a center frequency of 1500MHz. The temperature range is -40°C ~ +85°C at a minimum insertion loss of 1.1dB at 1.5GHz, making it a suitable choice for application such as RF transceivers (IMT/DECT base station transceivers, CDMA handsets, and cellular phones), broadband modems, two-way radio systems, and GPS systems.

The working principle of the RF1404D is based on the bulk acoustic wave phenomenon. When an acoustic wave is generated on the surface of substrate in the RF1404D, an electrical signal is generated having frequency that is determined by the physical geometry and material properties of the filter and the electrodes on it. This electrical signal is then transmitted and passed through the filter, where it is shifted by the desired frequency. The filter is designed such that it can reject out-of-band frequencies, while accepting and passing only the desired frequencies.

In operation, the RF1404D SAW filter receives an input signal and passes it through a band-pass filter that isolates the desired frequencies. There are two separate paths for the input signal, a low frequency and high frequency, both of which are needed to produce the desired output. The low frequency path passes the signal through a substrate filter and a series of delay lines on the surface of the substrate. The filter then passes the signal through the high frequency path, which has a second filter and another set of delay lines. After passing through both paths, the signal is combined and passed through a third filter to remove out-of-band frequencies.

The RF1404D uses a parallel resonant circuit, which consists of an inductor and capacitors, to filter out frequency components outside the desired frequency range. The inductors and capacitors are connected together to create a frequency dependant delay line. This delay line enables the filter to reject signals outside of the desired frequency range, while allowing those within the pass-band to pass through.

The RF1404D SAW filter also utilizes finite element simulations to evaluate its performance in different environments. This helps engineers identify areas of improvement to ensure the filter performs optimally. Finite element modeling also identifies potential sources of noise, which can be addressed and eliminated.

Overall, the RF1404D SAW filter is a great example of a high quality, high performance filter. Its combination of wide temperature range, out-of-band rejection, low insertion loss, and high Q characteristics make it an ideal choice for applications in a wide variety of radio frequency applications.

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