Fig. 1. TM band structure of the complete photonic crystal

Fig. 2. Band structure of a line defect waveguide

Fig. 3. Modes distribution diagram of a point defect resonant cavity

Fig. 4. Structure of photonic crystal filter

Fig. 5. Three-port filter and its performance

Fig. 6. Performance of two-port filter with the addition of reflector

Fig. 7. Performance of two-port filter with the addition of reflection cavity

Fig. 8. Performance of two-port filter with the addition of reflection cavity and reflector

Fig. 9. Performance of two-channel filter with reflection cavity and reflector

Fig. 10. Tolerance analysis of filter systems