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A 3-D printed antenna subsystem, which proves its effectiveness in cost- &#x0026; weight-reduction and reliability improvement over conventional CNC fabrication, is proposed in this paper. The proposed structure which integrates an orthogonal-mode transducer (OMT) and a corrugated horn is fully compatible to fabrication using high temperature resistant resin Acrylonitrile Butadiene Styrene (ABS) with 3-D printing technology, as well as coating using copper with electroless metallization method. Detailed design procedures are provided and a prototype operating at <inline-formula> <tex-math notation="LaTeX">$X$ </tex-math></inline-formula>-band is designed, fabricated and measured. Over the whole operating frequency range of 11.7 GHz&#x007E;12.7 GHz, measured reflection coefficients are better than &#x2212;22 dB and &#x2212;12 dB for different polarization directions. A very good isolation better than 60 dB is achieved between two input ports. The cross polarization level is at least 30 dB lower than the co-polarization. Moreover, the effectiveness of the fabricated antenna is also verified in a polarimetric radiometer system.

3-D Printed Antenna Subsystem With Dual-Polarization and its Test in System Level for Radiometer Applications