Compact Ka band Bias Tee Network Using Substrate Integrated Coaxial Line technology

This paper presents Ka- band bias tee network designed in a Substrate Integrated coaxial line environment. The proposed circuit operates in the frequency range 31-35 GHz. A series of butterfly stub is used to realize inductor. To implement capacitor, interdigital structure is introduced in the middle layer of SICL. The size of this proposed circuit design is 1.1 \lambda\mathrm{g}\times 0.72 \lambda\mathrm{g}, where \lambda\mathrm{g} is guided wavelength at centre frequency of 33 GHz. The proposed results exhibit 0.1 dB insertion loss along with DC isolation 22dB with good impedance matching. The proposed circuit is very much suitable for Ka band active components application.