RF & Wireless — question 9 of 10
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You're designing a battery-powered wireless sensor node that must: (1) stay under a regulatory EIRP limit of 20 dBm for its band, (2) maintain enough link margin to reach a gateway 2km away through foliage, and (3) pass radiated emissions testing for harmonics of its power amplifier -- all while board space constraints force the antenna to sit close to noisy digital traces. Walk me through the tradeoffs between output power, antenna gain, matching network loss, and EMC filtering, and tell me what you'd prioritize first and why.