In　this　paper,　a　novel　substrate　integrated　waveguide　(SIW)　filtenna　with　two　controllable　radiation　nulls　is　proposed,　which　has　the　advantage　of　good　radiation　characteristics.　Radiation　nulls　are　generated　by　electric　and　magnetic　mixed　coupling　structure　and　fundamental　mode,　respectively.　And　a　quasi-elliptic　characteristic　can　be　obtained　at　the　boresight　gain　direction.　By　changing　the　length　of　perturbation　slot　and　the　strength　of　electric　coupling　and　magnetic　coupling,　the　position　of　radiation　nulls　can　be　controlled　independetly.　Compared　to　conventional　filtenna,　the　proposed　SIW　filtenna　has　no　extra　filtering　circuit　to　increase　the　dimension　and　complexity.　Two　resonant　modes　in　the　passband　can　be　excited　through　loading　electric　and　magnetic　mixed　coupling　structure　in　one　SIW　cavity.　The　measured　results　are　in　good　agreement　with　simulated　results.　The　good　frequency　selectivity　and　out-of-band　rejection　are　achieved.　The　proposed　antenna　exhibits　a　maximum　realized　gain　of　5.8　dBi　at　the　operating　bandwidth.　The　measured　impedance　bandwidth　is　from　9.44　GHz　to　9.68　GHz　and　the　cross-polarization　levels　are　lower　than　-20　dB　in　both　planes.　©　2013　IEEE.