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PGA460 200K 小角度<10度测距方案选型,国内易采购的变压器以及超声探头

目前我已经实现了40k一般车载探头的测距,问题是测距夹角比较大,另外盲区有点大,接近30cm。我也看了TI的200K超声频率的一些器件选型,但是国内都比较难以采购。我想请问,有没有国内容易买到的验证过的探头以及200k的变压器选型?非常感谢!