2026 Agenda

As spectrum resources become increasingly congested, filters have become a critical component of Land Mobile Radio (LMR) systems. They directly influence both performance and cost, driving stringent technical requirements alongside the need for high-volume production and rapid delivery.

Intermodulation remains a significant challenge, with third- and fifth-order products frequently reaching the receiver and causing severe desensitization. Effective mitigation requires a deep understanding of the combining system. Consequently, accurate pre-assembly analysis of filter performance is essential to streamline manufacturing and minimize costs.

Modern digital radios employ advanced modulation schemes such as OFDM to achieve higher spectral efficiency and improved resistance to multipath fading. These systems often exhibit peak-to-average power ratios sometimes approaching 3 dB, leading to high instantaneous peak power levels.

Takeaway

To address these challenges, we propose a structured design methodology based on advanced mathematical analysis. This approach enables:
• Accurate prediction of filter response at any port between the radio and the antenna.
• Calculation of PIP as a function of number of channels, power, IL, VSWR and modulation scheme.
• Precise estimation of power-handling capability for each filter, regardless of topology or technology.
• Prediction of intermodulation levels based on the system’s IP3.
• Systematic design and testing of filters optimized for low-PIM, High PIP performance.

A user-friendly application with an intuitive graphical interface will be offered to participants at no cost