To meet the requirements of high performance and miniaturization for intermediate frequency（IF）filters in radio frequency（RF）receivers while considering passive intermodulation（PIM）interference from passive components，an LC high-performance filter was designed and implemented based on an eighth-order elliptic function with a nominal frequency of 81 MHz. The filter measured 14 × 5.5 ×5 mm³，achieving a relative bandwidth（BW）of approximately 26.84%，a shape factor（BW_40dB/BW_3dB）of less than 1.78，a stopband rejection of up to 60 dBc at a far-end frequency of 1 GHz，a voltage standing wave ratio of ≤1.28，a minimum in-band insertion loss of 3.2 dB，an in-band phase consistency within the same batch of ≤ ±6°，and a PIM power level of -77 dBm. The filter design exhibited excellent agreement with the specifications，showing significant practical utility.