A Compact Dual-Band Impedance Matching Network Based on All-Pass Coupled Lines

This paper proposes the design of a compact dual-frequency impedance matching network that matches frequency dependent complex loads at two distinct frequencies with a real source. The design utilizes two coupled lines in their all-pass configuration. The same helps in flexibility of the frequency ratios of operation. As an example, a prototype operating at the Bluetooth and WiFi frequencies of 2.4 and 5.8 GHz respectively, has been fabricated. The measured results are in good agreement with the simulated ones.