CC2640蓝牙天线RSSI值太低

CC2640设计时由于空间有限，使用的是巴伦+陶瓷天线。巴伦用的是LFB182G45BG5D920，RX TX 直接接巴伦，巴伦输出直接接陶瓷天线， PCB厂家检测的这段导线阻抗是50。但测试RSSI值还是太低。一米外就已经-80往下了...，想问下这样设计是否存在问题，TI有没有使用巴伦+陶瓷天线这样的参考设计，谢谢

如下，建议完全copy设计

http://www.ti.com/tool/TIDC-CC2650-UTAG?keyMatch=CC2640&tisearch=tidesigns

多谢分享！

你好，

可以把你PCB的图片贴一下吗？

一起参考一下，是不是陶瓷天线的问题？

在CC254x的设计当中我们有使用过LFB182G45BG2D280的巴伦做参考设计：

Murata’s LFB182G45BG2D280 integrated balun is specially designed for use with
Texas Instruments’ CC253x, CC254x, CC257x and CC85xx devices. This balun
greatly simplifies the RF frontend by reducing required board space and also reduces
possible design errors to a minimum. Additionally the balun has integrated filter
components which greatly reduces harmonic radiation.
The LFB182G45BG2D280 is a six pin device with mechanical dimensions of only
1.6 mm x 0.8 mm (EIA 0603). The balun replaces 9 discrete 0402 components in the
recommended discrete balun / filter design.