In high-frequency power amplifier systems, wireless communication base stations, microwave RF testing, radar signal networking and satellite transmission equipment, various interferences during the synchronous synthesis of multi-channel RF signals are the core factors restricting the output quality, stability and service life of the system. Under the working condition of multi-signal superposition, channel crosstalk, harmonic interference, mutual power interference and electromagnetic clutter interference occur frequently, which easily cause signal distortion, power attenuation and output disorder, and may even lead to overload damage of power amplifier devices in severe cases. The radial power combiner is a professional RF combining device designed based on the radial cavity coupling principle. Different from traditional linear power combining structures, its unique annular radial layout possesses inherent anti-interference and clutter suppression capabilities. It can suppress various interferences in the process of multi-channel signal synthesis from both physical structure and circuit levels, greatly improving the purity and output stability of signal synthesis in RF systems, and serving as the core equipment for anti-interference optimization of high-frequency, high-power and multi-channel RF systems.

　　The most prominent shortcoming of traditional linear power combining equipment is that mutual channel interference and frequency crosstalk are prone to occur during the parallel synthesis of multi-channel signals. Traditional cascaded combining structures feature dense channel arrangement and complex signal coupling paths. During the superposition and transmission of RF signals with different frequencies and power levels, cross interference is easily formed through line coupling and spatial electromagnetic penetration. High-power signals suppress low-power signals, and high-frequency clutter superimposes on main signals, resulting in sharp increase of noise and waveform distortion of synthesized signals, and greatly reducing the signal-to-noise ratio of the system. Adopting a centrally symmetric radial cavity structure, the radial power combiner arranges all input signals uniformly around the central node. Each channel has an independent physical transmission interval and coupling path, structurally cutting off the signal crosstalk path between channels and avoiding mutual interference caused by close-range coupling of multi-channel signals. Even under full-load synchronous operation of multiple channels, signals of each link remain independent without frequency crosstalk, power counteraction or clutter superposition, eliminating structural interference defects of multi-channel signal synthesis from the source.

　　Under high-power RF synthesis working conditions, harmonic interference and standing wave interference are core hidden problems affecting output quality, and the radial power combiner can efficiently suppress signal degradation caused by nonlinear interference. During the synthesis and superposition of multi-channel RF signals, affected by transient power changes, phase deviation and nonlinear device characteristics, high-order harmonics, spurious signals and standing wave interference are easily generated. These interference signals are highly concealed and widely propagated, which not only pollute main signals and cause unstable output power and frequency offset, but also flow back to the front-end power amplifier equipment, triggering self-oscillation, overheating and even burnout of devices. With an optimized uniform cavity coupling design, the radial power combiner has excellent circuit linearity and uniform power bearing capacity, which can effectively weaken nonlinear distortion during signal superposition and inhibit the generation of harmonic and spurious interference. Meanwhile, its symmetric impedance matching structure greatly reduces the signal reflection coefficient, suppresses standing wave accumulation in the link, prevents front-end equipment and synthesis links from being damaged by reflection and backflow interference, and ensures the purity and stability of high-power signal synthesis.

　　The excellent external interference resistance in complex electromagnetic environments enables the radial power combiner to adapt to high-end industrial and military high-frequency scenarios. Working scenarios such as outdoor base stations, industrial RF workshops and field radar equipment are filled with external interference signals such as power frequency electromagnetic radiation, high-frequency clutter and environmental electromagnetic pulses. Ordinary combining devices have weak shielding and anti-interference capabilities, and external interference can easily invade the synthesis link, disrupt the balance of signal synthesis, and cause output parameter drift and transmission faults. Adopting an integrated hermetically sealed metal cavity, the radial power combiner has superior electromagnetic shielding performance, which can block the intrusion of external electromagnetic interference signals in all directions and avoid disorder of internal synthesized signals caused by superposition of external clutter. In addition, the radial balanced layout can evenly distribute the power load of each channel, eliminate electromagnetic clutter caused by local power overload, enable the equipment to work stably in strong-interference and complex electromagnetic environments, and maintain accurate signal synthesis without being affected by external interference.

　　Compared with traditional combining devices, the radial power combiner features more stable anti-interference performance suitable for long-term uninterrupted operation. Traditional linear combiners are prone to parameter drift, line aging, impedance imbalance and other problems after long-term operation, which further induce intermittent interference, signal jitter and other faults, leading to high operation and maintenance costs. The radial power combiner has a minimalist structure without redundant circuits, with extremely low cavity coupling loss and excellent resistance to aging, vibration and temperature drift. No parameter offset or interference surge will occur during long-term operation. Its uniform power distribution and synthesis mechanism can continuously maintain the phase and power balance of multi-channel signals, eliminate dynamic interference caused by working condition fluctuations, and support efficient, pure and interference-free RF signal synthesis all day long. It is widely applicable to high-end scenarios such as communication, military industry, industrial measurement and control, and precision microwave testing, effectively solving various interference problems in multi-channel RF synthesis and optimizing the overall operating quality of RF systems.