B39202B4170U510

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Surface acoustic wave (SAW) filters are a device used in many industries for a wide array of applications. The B30223B4170U510 SAW filter is a product of AsiaRF and is part of their U series of SAW filters. This filter is specifically designed for the 700–721 MHz frequency band. It is a 2 pole filter with the insertion loss of less than 0.6 dB and low passband ripple. The signal to noise ratio of the filter is greater than 51 dB and the attenuation less than 48 dB.

The B30223B4170U510 SAW filter is primarily designed for cellular base transceiver stations where it provides effective filtering over its 700–721 MHz range. In a mobile network, the base station receives an input signal from the antennas, which must be filtered from noise and other forms of interference. The B30223B4170U510 provides this signal filtering over its frequency band and can aid in reducing interference. Other applications are in digital television antenna systems, land mobile radios, LTE, UMTS, and PCS networks.

The B30223B4170U510 SAW filter also has a wide application field thanks to its low in-band insertion loss, return loss and excellent out-of-band rejection qualities. These make it suitable for use in designs that require high frequency selectivity for multiple channels, ultra-narrow bandwidths, and precise frequency selection. It is a relatively small device, with a length of 60 m and a width of 2.5 m, making it especially suitable for low profile applications, such as cellular antenna systems.

The working principle of the B30223B4170U510 SAW filter is based on the physical properties of surface acoustic wave (SAW) propagation. This takes place when a wave of mechanical energy, known as an acoustic wave, is transmitted along the surface of a substrate medium. A filter is constructed from two separate SAW strips, with each strip having an interdigital transducer (IDT) etched onto one side. When an electrical signal is applied across the two IDT’s, mechanical energy is created and the two SAWs move in opposite directions along the substrate, creating a filter function.

In the B30223B4170U510 filter, the signal passes through the first IDT and then propagates along the substrate to the second IDT (where it will be reflected back) in a process known as wave-coupling. This wave-coupling process generates a response which is then transmitted back out through the first IDT, and down the substrate to the second IDT. This filtered signal is then received and amplified to form the output signal. This process is repeated for each frequency within the 700–721 MHz frequency band, resulting in a filtering of the signal for all frequencies within this range.

The B30223B4170U510 SAW filter is designed to filter the signal within its specified frequency band and provide an effective signal to noise ratio. Its compact size and low profile make it ideal for use in cellular antenna systems. It is also suitable for a wide array of applications thanks to its low in-band insertion loss, return loss and excellent out-of-band rejection qualities. This makes it an ideal choice for applications that require precise frequency selection, multiple channels, and ultra-narrow bandwidths.

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