Name: Cavity PCB
Brand: PCB Printed Circuit Board and PCBA manufacturing
Rating: 5 (1 reviews)

Description
Data Sheet

Cavity PCB is professionally customized for high-frequency power divider applications. A power divider is a passive RF component that splits one input signal into two or multiple output channels with equal or unequal power distribution. It can also converge multiple independent signals into a single output, functioning as both a power splitter and signal combiner. Sufficient isolation must be maintained between output ports. Major technical parameters include insertion loss, distribution loss, reflection loss, port voltage standing wave ratio, inter-port isolation, power handling capacity and operating bandwidth.

Microwave devices adopting Cavity PCB feature compact dimensions, simple structure and broad applicability. Without screw fastening structures, they help cut manufacturing costs, facilitate mass production, and eliminate intermodulation interference risks induced by fasteners.

Power dividers, combiners and directional couplers belong to standard high-frequency passive components. They undertake power distribution, signal shunting and high-frequency energy coupling, enabling low-loss signal extraction for antennas and RF systems. The selection of Cavity PCB substrates directly determines core device performance. Therefore, during the design and fabrication of power dividers, combiners and couplers, understanding the correlation between PCB material properties and electrical indicators helps rationalize parameters including frequency range, operating bandwidth and power rating.

Cavity PCB material selection shall focus on key attributes: stable dielectric constant, low temperature drift, low dielectric and conductor loss, and high power endurance. Proper substrate matching is essential for stable performance of high-frequency splitting, combining and coupling products.

Cavity PCB

Cavity Coupler Introduction

The cavity coupler equipped with Cavity PCB realizes on-demand distribution of RF signals. With customizable coupling loss, wide frequency coverage, low in-band insertion loss, high isolation and low standing wave ratio, it is suitable for long-term stable operation in base station coupling, high-power signal transmission and indoor distribution systems, and can be customized to operator specifications.

Adopting air as the dielectric medium without isolation resistors, the cavity coupler delivers excellent heat dissipation and high power resistance, with a maximum load of 200W and ultra-low insertion loss. Its common frequency range covers 800–2500 MHz, with optional coupling degrees of 5dB, 6dB, 7dB, 8dB, 10dB, 15dB, 20dB, 25dB and 30dB. Cavity power dividers are available in 2-way, 3-way and 4-way models.

Frequency Band Application

400–500 MHz 2-way / 3-way power dividers: Applied in conventional radio communication, railway communication and 450 MHz wireless local loop systems.
800–2500 MHz microstrip and cavity power dividers: Widely used in GSM, CDMA, PHS and WLAN indoor coverage projects.
1700–2500 MHz high-frequency cavity power dividers: Adapted to PHS and WLAN high-band signal distribution.
800–1200 MHz / 1600–2000 MHz microstrip power dividers: Ideal for miniaturized compact electronic equipment.

POWER DIVIDER CONTAINS CAVITY PCB

Cavity PCB Power Divider & Wilkinson PCB Power Divider

Cavity PCB power dividers are widely deployed in wireless distribution systems, distributing base station transmitting signals to multi-antenna arrays and returning received signals to base station receivers. Two mainstream types include Wilkinson microstrip PCB and cavity PCB structures.

The cavity PCB power divider adopts a coaxial structure, converting 50Ω input impedance to 25Ω through internal and external conductor matching, so as to form optimal impedance matching with parallel dual 50Ω output ports.

The Wilkinson microstrip power divider is constructed with 1/4 wavelength 70.7Ω microstrip lines and 100Ω isolation resistors between output terminals.

In terms of insertion loss, cavity power dividers use silver-plated brass inner conductors, copper or aluminum shells and air dielectric, achieving insertion loss lower than 0.05dB (marked 0.1dB for unified testing standards). In comparison, microstrip power dividers have inherent loss of 0.3–0.5dB; cumulative loss of cascaded devices will seriously weaken overall signal quality.

For operational reliability, microstrip power dividers face burnout risks. When antennas or cables suffer short circuits or open circuits, reflected high-power transmitting signals will damage low-power isolation resistors (100mW rated power), causing permanent device failure. In contrast, cavity PCB power dividers contain no vulnerable isolation resistors and can recover normal operation immediately after external circuit faults are eliminated.

Shielding Design & EMC Optimization

In RF PCB design, the arrangement of shielding cavities is restricted by structural space. Reasonable selection of enclosed shielding structures can effectively suppress electromagnetic interference. Perimeter fence-type shielding cavities can be welded to the PCB via pins through wave soldering, reflow soldering or manual welding. Spring finger removable covers support convenient maintenance, with standard and low-profile types optional. Internal and external spring fingers can be combined to adapt to narrow installation spaces.

As RF electronic devices continue to develop, electromagnetic compatibility design has become indispensable. Early shielding planning avoids later PCB layout revision and product rework, ensuring compliance with RoHS and other environmental regulations while controlling comprehensive costs.

In the cavity filter industry, Cavity PCB coupling lines are arranged at antenna ports for signal sampling and power shunting to meet fixed coupling indicators such as -35dB. For high-precision coupling requirements, longer or densely arranged coupling structures are required. Limited by miniaturized design, compact space raises higher processing challenges for low-frequency filter Cavity PCB routing and precision control.

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

Cavity PCB

Description

Data Sheet

Frequency Band Application

Cavity PCB Power Divider & Wilkinson PCB Power Divider

Shielding Design & EMC Optimization