In recent years, the demand for consumer electronic products has continued to grow, and the technology and market for wireless products have been further improved.近年来，对消费电子产品的需求持续增长，并且无线产品的技术和市场得到了进一步改善。 As an irreplaceable key component in wireless products, antennas have also been further developed and improved.作为无线产品中不可替代的关键组件，天线也得到了进一步的开发和改进。 In Bluetooth products, the relationship between the antenna and the Bluetooth module is complementary.在蓝牙产品中，天线和蓝牙模块之间的关系是互补的。 In addition to the core system chip, the antenna is another key component that affects the transmission characteristics of the Bluetooth module.除了核心系统芯片之外，天线是影响蓝牙模块传输特性的另一个关键组件。
First, briefly outline what is an antenna?首先，简要概述什么是天线？ An antenna is a device used to transmit or receive electromagnetic waves.天线是用于发送或接收电磁波的设备。 The function of the antenna: The function of the transmitting antenna is to effectively convert the energy of the high-frequency current of the transmitter (or the guided wave in the waveguide system) into electromagnetic energy in space;天线的功能：发射天线的功能是将发射机高频电流的能量（或波导系统中的导波）有效地转换为空间中的电磁能； the function of the receiving antenna is just the opposite, so the antenna actually It is a transducer.接收天线的功能恰好相反，因此天线实际上是一个换能器。
例如，比较市场上蓝牙模块的三种常见天线：陶瓷天线，PCB天线和IPEX外部天线。
1.陶瓷天线是适合蓝牙设备的小型天线。 Ceramic antennas are divided into bulk ceramic antennas and multilayer ceramic antennas.陶瓷天线分为块状陶瓷天线和多层陶瓷天线。 The block antenna is to use high temperature to sinter the whole ceramic body at a time, and then print the metal part of the antenna on the surface of the ceramic block.块状天线是使用高温一次烧结整个陶瓷体，然后将天线的金属部分印刷在陶瓷块的表面上。 The firing of multilayer antennas adopts low-temperature co-firing.多层天线的发射采用低温共发射。 The multilayer ceramics are laminated and aligned and then sintered at high temperature.将多层陶瓷层压并对准，然后在高温下烧结。 Therefore, the metal conductor of the antenna can be printed on each ceramic dielectric layer according to the design needs, which can be effective.因此，可以根据设计需要将天线的金属导体印刷在每个陶瓷介电层上，这是有效的。 Reduce the size of the antenna and achieve the purpose of hiding the antenna.减小天线尺寸，达到隐藏天线的目的。 Since the dielectric constant of the ceramic itself is higher than that of the pcb circuit board, the use of ceramic antennas can effectively reduce the antenna size.由于陶瓷本身的介电常数高于pcb电路板的介电常数，因此使用陶瓷天线可以有效地减小天线尺寸。
2。 PCB天线是指PCB上用于无线接收和传输的部分。 发射时，它将发射器的高频电流转换为空间电磁波； 接收时，它将从太空截获的电磁波转换为高频电流，并将其发送到接收器。 它的优点是：占用空间少，成本低，无需单独组装天线，不易触碰和损坏，整机易于组装，但有损益---牺牲了性能。 缺点是难以将单个天线场弄圆，插入损耗高，效率相对较低，并且容易受到母板的干扰。
3. IPEX天线是射频电路和天线之间的接口，已广泛用于无线局域网（WLAN）相关产品板中。 Its advantages are: field type can be controlled better, insertion loss is low, signal directionality is good, high efficiency, strong anti-interference ability, can be far away from the interference on the motherboard, and does not require too much debugging and matching, as a terminal manufacturer , You only need to connect an IPEX antenna outside;它的优点是：场型可以更好地控制，插入损耗低，信号指向性好，效率高，抗干扰能力强，可以远离主板上的干扰，并且不需要太多的调试和匹配作为终端制造商，您只需在外部连接IPEX天线即可； of course, there are disadvantages: high cost and troublesome assembly.当然，也有缺点：高成本和麻烦的组装。
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