Of primary concern for dense electronic circuits is the dielectric behavior of the underlying substrate. Unfortunately, most of the extant literature on reprocessible polymer e-substrates fail to adequately quantify this behavior. Here, we measure both the dielectric constant (Figure ) and dielectric loss (Figure ) of our polyimide network polymers at ultra-high frequency regimes relevant to wireless data transfer (Cellular networks, WiFi, Bluetooth, Ultra-wide Band, etc.) At 4.1 GHz, these photopolymers possess dielectric constants (Dk) ranging from 2.69 (PI-ether) to 3.05 (PI-ester), slightly lower but still comparable than that of Kapton-NH (3.4). We believe the relatively high dielectric strength of the PI-ester polymer originates from the polar ester groups and could be further accentuated by high dielectric fillers.