Electronic circuit modules (10; 100; 400) have connector (11; 111; 411) with through pins (14, 114; 414) and a metal ground path (17) embedded therein which fit within a recess (24; 124; 424) formed by a heat sink (18; 118; 418) having a central plate portion (19) surrounded by metallic cooling fins (23). A polyimide insulating circuit base film (26; 126; 500) has conductor paths (27) and circuit components (30) on at least a top surface (28) thereof with a bottom surface (31) mounted to the top surface (21) of the heat sink plate portion (19). The connector through pins are electrically connected to the conductor paths on the polyimide base film and a cover (33;133) together with the heat sink forms an internal cavity (34; 134) for protection of the components. This structure provides a compact configuration and lower manufacturing costs for a circuit module, permits reducing RF radiation and absorption problems and permits reducing resistive connections between the through pins and the components. Also implemented are high frequency bypass capacitive networks (18, 222; 118, 325) associated with each of the conductive through pins.