DEVELOPMENT AND EXPERIMENTAL VALIDATION OF A 315–335 MHZ RF POWER AMPLIFIER FOR SPECIALIZED SHORT-RANGE COMMUNICATION SYSTEMS
Keywords:
RF power amplifier, nonstandard frequency band, efficiency, stability, gain, PAE, output power, harmonic suppression, implementationAbstract
This study presents the design, optimization, and practical implementation of a proposed RF power amplifier (RFPA) specifically engineered for operation within nonstandard frequency bands, where conventional amplifier topologies often exhibit reduced efficiency, instability, and significant output power degradation. The amplifier was developed using a Class-AB configuration to balance linearity and efficiency, with a target operational range of 315–335 MHz, a band commonly used for specialized communication systems such as industrial control, short-range telemetry, and customized RF modules. Computer-aided simulations were conducted using ADS and CST Studio Suite to analyze key parameters including gain, power-added efficiency (PAE), output power, harmonic suppression, and stability factor (K).
Simulation results showed a peak gain of 18.7 dB, an output power of 27.5 dBm, and a PAE of 54.2% at 325 MHz. The stability analysis indicated a Rollett stability factor K = 1.42, confirming unconditional stability across the entire operational band. To ensure practical viability, the amplifier was constructed on a FR-4 substrate (εr = 4.3, thickness 1.6 mm), using a matched input–output network optimized for minimal insertion loss and maximum power transfer. Laboratory measurements closely matched simulation outcomes, yielding a measured gain of 17.9 dB, output power of 26.8 dBm, and PAE of 52.6%, demonstrating less than 5% deviation from simulated values. Further evaluation included spectrum analysis, which confirmed harmonic suppression greater than –32 dBc for the second harmonic and –41 dBc for the third harmonic. Thermal performance tests indicated a temperature rise of 14°C at full load, remaining within safe operational limits without requiring active cooling. Overall, the study confirms that the proposed RFPA offers a robust, energy-efficient, and stable solution for nonstandard frequency applications. Its strong agreement between simulation and measurement validates its applicability in customized RF systems requiring high reliability, enhanced signal performance, and cost-effective hardware deployment.
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