High-temperature capable (T-g: 280-290 degrees C), broadband radar transparent [epsilon': 3.3-3.9; epsilon '': 0.02-0.17; tan delta: 0.01-0.04 and transmission loss: -0.18 to -1.26 dB1 in C, X, and Ku bands (5.4-18 GHz)], composites were developed using polyetherimide (PEI)-toughened bisphenol E cyanate ester resin and E glass fabrics through an out-of-autoclave process called resin film infusion at a range of PEI weight fractions via a solvent-free method. Their pronounced increase in impact resistance in terms of mode I interlaminar fracture toughness (G(Ic); 50-100%), postimpact residual compressive strength (>85%), and enhanced structural properties such as tensile strength, compressive strength, in-plane shear strength, and inter-laminar shear strength compared with control laminates, which later recorroborated with a structure-property relationship using surface morphology proving that PEI-modified cyanate esters can find extensive applications in impact-resistant composite radomes for high-speed aircrafts.