一、Characteristics
1268.52MHz is a surface acoustic wave filter (SAW filter for short) used in Beidou band, and its center frequency is 1268.52MHz. The minimum 2dB bandwidth is 20.46MHz, and the typical bandwidth is 38.3MHz. Standing wave ratio 1.3@1258.29 ~ 1278.75MHz, 2.1@1258.29 ~ 1278.75MHz Max; Package form is 3030; Attenuation (0dB as reference) 39dB@1227.52MHz min, 45.5dB@1227.52MHz; 50dB@1309.52MHz min, 67dB@1309.52MHz; With small insertion loss (≤1.7dB), small size, temperature (working temperature: -40℃--+85℃; Storage temperature: -45℃--+85℃) Good characteristics, high integration, easy welding, good weldability, light weight, good performance, high stability, cheap, stable and reliable performance in the full temperature range, meet the requirements of military working environment (-55℃ ~ +85℃).
The surface acoustic wave filter plays a good role in suppressing high order harmonics, image information, transmission leakage signal and various parasitic clutter interference of electronic information equipment, and can realize the filtering of amplitude-frequency and phase-frequency characteristics with any desired accuracy. The biggest disadvantage of the sound meter filter is that the insertion loss is larger than that of the LC resonant circuit, and the bandwidth is too narrow (tens of KHZ), resulting in extremely slow download speed.
1268.52M Surface acoustic wave filter
1268.52M Surface acoustic wave filter main parameters table
|
| Item | Minimum | Minimum | Maximum | Maximum |
| Center Frequency |
| 1268.52 |
| MHz |
| Insertion Loss (1258.29~1278.75 MHz) | - | 1.7 | 3.2 | dB |
Ripple in BW (1258.29~1278.75 MHz) | - | 0.5 | 1.8 | dB |
2dB Band Width | 20.46 | 38.3 | - | MHz |
V.S.W.R (1258.29~1278.75 MHz) |
| 1.3 |
|
|
衰减(参考0dB)
|
1227.52 MHz | 39 | 45.5 | - | dB |
1309.52 MHz
| 50 | 67 | - | dB |
Operating temperature
| -40 | - | +85 | ℃ |
Encapsulation form
| SMD 3030 |
二、Package Dimension
3030 Surface acoustic wave resonator size
| Pin | Configuration |
| 2 | Input |
| 5 | Output |
| 1、3、4、6 | Case Ground |
三、Circuit diagram
四、Typical Frequency Response
1268.52MHz S21 20dB/10dB 1268.52MHz S21 10dB/40dB
五、Reflex function
1268.52MHz S11 1268.52MHz S22
六、Application & attention
1268.52MHz 3030 surface acoustic wave filter is widely used in various wireless communication systems, Beidou satellite navigation, wireless transmitter, wireless transmitter module and other wireless communication. When in use, pay attention to the grounding end is well grounded, otherwise it will affect out-of-band suppression and flatness indicators. The welding temperature should not be too high and the welding time should not be too long. If reflow welding is used, the recommended temperature is recommended, and wave soldering is not recommended. Products should be stored in the ambient temperature of -10℃~40℃, relative humidity is not more than 80%, the surrounding environment is not acidic, alkaline and other harmful gases in the warehouse. Do not soak when cleaning, it is recommended to wipe with alcohol.
The company has SAW filter, SAW filter, 1268.52MHz sound meter filter, 1575.42MHz sound meter filter and other frequencies of surface acoustic wave resonators and surface acoustic wave resonators. For the frequency and package of routine use, timely delivery can be achieved.
