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In this brief, a compact high isolation filtering power divider (FPD) with wide stopband and wide-band three-port reflectionless operation is proposed. Such FPD consists of a trigonometric substrate-integrated defected ground structure (SIDGS) based resonator and three absorptive networks. The good stopband performance is achieved by using the trigonometric SIDGS. Meanwhile, the absorptive networks based on common-gate topology capable of absorbing the out-of-band reflected signals are connected to the SIDGS resonator, which provides the wideband reflectionless operation in all three ports of the FPD. To verify the mechanisms mentioned above, a FPD operated at 2.10 GHz (i.e., <inline-formula> <tex-math notation="LaTeX">$\boldsymbol {f_{0}}$ </tex-math></inline-formula>) is fabricated, which exhibits a 42 dB stopband rejection level up to 20 GHz (i.e., <inline-formula> <tex-math notation="LaTeX">$9.5\boldsymbol {f_{0}}$ </tex-math></inline-formula>). The measured reflectionless range with return loss lower than &#x2212;10 dB is up to 10 GHz in all three ports. The core size of the FPD is about <inline-formula> <tex-math notation="LaTeX">$0.36\,\,\boldsymbol {\lambda _{g}} \times 0.38\,\,\boldsymbol {\lambda _{g}}$ </tex-math></inline-formula>, where <inline-formula> <tex-math notation="LaTeX">$\boldsymbol {\lambda _{g}}$ </tex-math></inline-formula> is the microstrip guided wavelength at the center frequency.

Compact SIDGS Filtering Power Divider With Three-Port 10-GHz Reflectionless Range