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High frequency PCB

High frequency PCB

High frequency PCB

High frequency PCB

  • Cavity pcb for power divider
    Cavity pcb for power divider

    Product Name: Cavity pcb

    Material: Teflon F4MB

    Quality standard: IPC6012 Class 2

    Dielectric constant: 2.55

    Layers: 2Layers

    Thickness: 1.5mm

    Copper thickness: base copper 0.5oz, finished copper thickness 1oz

    Surface technology: Immersion Silver

    Application: Cavity pcb for power divider

    Product Details Data Sheet

    Cavity pcb used for power divider, a power divider is a device that divides the energy of one input signal into two or more channels to output equal or unequal energy. It can also combine the energy of multiple signals into one output. Can also be called a combiner. A certain degree of isolation should be guaranteed between the output ports of a power divider. The main technical parameters of the power splitter include power loss (including insertion loss, distribution loss and reflection loss), the voltage standing wave ratio of each port, the isolation between power distribution ports, power capacity and bandwidth, etc.

    1. 400MHz-500MHz frequency band two and three power divider, used in conventional radio communication, railway communication and 450MHz wireless local loop system.

    2. 800MHz-2500MHz frequency band two, three and four microstrip series power dividers are used in GSM/CDMA/PHS/WLAN indoor coverage projects.

    3. 800MHz-2500MHz frequency range two, three and four cavity series power dividers are used in GSM/CDMA/PHS/WLAN indoor coverage projects.

    4. 1700MHz-2500MHz frequency range two, three and four cavity series power dividers are used in PHS/WLAN indoor coverage projects.

    5. Microstrip two and three power dividers used in small volume equipment in the frequency range of 800MHz-1200MHz/1600MHz-2000MHz.

    power divider contains cavity pcb

    power divider contains cavity pcb

    The power divider is widely used in wireless distribution systems. It can distribute the transmitted signal (Tx) of the base station into multiple antennas and send the signal (Rx) received by the antenna back to the base station receiver at the same time.

    There are two typical two-way power dividers, Wilkinson pcb and cavity pcb.

    Features of cavity pcb power divider and Wilkinson pcb power divider:

    The cavity pcb power divider is generally a coaxial structure, which transforms the input 50Ω impedance to 25Ω (using different ratios of inner and outer conductors). The 25Ω impedance can be well matched with the parallel impedance of the two output 50Ω.

    The Wilkinson pcb power divider is usually designed with a microstrip structure, consisting of a pair of strip lines with a 1/4 wavelength impedance of 70.7Ω, and a 100Ω resistor in series between the output ports.


    Insertion loss is the natural enemy of wireless distribution system design. The inner conductor of the cavity power divider is made of brass, the surface is plated with silver, the shell is made of copper or aluminum, and the air medium is used. It can be considered as the transmission line with the least loss (except for superconducting). It is usually 0.05 dB or less, but it is usually marked as 0.1 dB because it is very difficult to test such a small insertion loss. The microstrip power divider adopts a microstrip design and has an inherent loss of 0.3 to 0.5 dB. It doesn't sound big, but after the accumulation of multiple power dividers, the result is big.


    For the reliability and safety of the cavity pcb system, for the microstrip power splitter, if the cable or antenna is damaged, it may cause an open circuit or short circuit of the splitter. But because of the isolation between the outputs, the problem of one arm will not affect the other arm. However, there is another situation where the Tx signal is reflected, and the Tx signal is many times larger than the Rx signal. Because the microstrip requires small size and its resistance rated power is also small, generally 100mw, there is no problem with consuming Rx signals, but when the circuit (antenna, cable) is open or short-circuited, the reflected Tx signal is enough to burn out This fragile resistance. Once the resistor is burned out, the power divider will not work normally, making it more difficult to recover the network. The cavity power divider has no resistance to burn, so once the open circuit or short circuit problem is solved, normal operation can be resumed immediately.


    At the end of the PCB design process, it is decided whether to use the radio frequency interference shielding cavity, which often makes there is not enough space to join the shielding cavity, which causes the cavity to affect other areas of the design in terms of physical structure.


    For specific applications of cavity pcb, careful consideration of the above issues helps to choose the most appropriate and economical shielding form. Different four-sided shielded cavities can be selected for different application requirements. The four-sided shielding cavity with a finger spring cover has fences on all four sides. By hand soldering, wave soldering or through-hole reflow soldering these fences and the series of pins on the edge of the PCB can weld the cavity to the PCB board. Finger spring covers are often used in this type of cavity. If the height of the fence is high enough to accommodate the finger spring, then the finger spring cover is the best choice among the removable covers. The size of finger springs, such as standard height or low profile, can be produced according to requirements. If there is not enough space outside the fence to place the external finger spring, the internal finger spring should be used. Moreover, the external finger spring and the internal finger spring having the same form on the opposite side can be mixed and used.


    Electronic equipment and radio frequency applications are ubiquitous in our daily lives, and the regulations and directives of various regulatory agencies are changing day by day, which means that it has never been more important to consider the radiation interference between independent components on the cavity pcb and adjacent circuits. The shielding of radiated interference should be considered in conjunction with other design factors of the product, and it is best to consider it at an early stage to avoid the expensive cost of PCB layout modification and equipment redesign to meet the initial electromagnetic compatibility test requirements. Other issues that need to be considered include product testing, shielding during production, other management instructions, such as RoHS regulations and costs.


    For pcb technical problems, ipcb knowledgeable support team is here to help you with every step. You can also request pcb quotation here. Please contact E-mail sales@ipcb.com

    We will respond very quickly.

    Product Name: Cavity pcb

    Material: Teflon F4MB

    Quality standard: IPC6012 Class 2

    Dielectric constant: 2.55

    Layers: 2Layers

    Thickness: 1.5mm

    Copper thickness: base copper 0.5oz, finished copper thickness 1oz

    Surface technology: Immersion Silver

    Application: Cavity pcb for power divider


    For pcb technical problems, ipcb knowledgeable support team is here to help you with every step. You can also request pcb quotation here. Please contact E-mail sales@ipcb.com

    We will respond very quickly.