A Self-Decoupled Ku-Band CP MIMO Antenna Using Asymmetrically Stepped Slotted Patches
Year: 2026
Type: article
Abstract: This letter proposes a small self-decoupled circularly polarized (CP) multiple-input–multiple-output (MIMO) antenna working in the Ku band for satellite communication. Each radiating element consists of an asymmetrically stepped slotted patch, in which slot-induced perturbations excite two orthogonal characteristic modes with a quadrature phase relationship, as verified by characteristic mode analysis. This radiator-level design inherently reduces mutual coupling between neighboring elements while achieving CP radiation, without requiring additional decoupling or polarization control mechanisms. The proposed antenna attains an impedance bandwidth of 12 GHz to 14.2 GHz (16.8%) and maintains a minimum interelement isolation of 25 dB across the operating band. CP is achieved with an axial ratio bandwidth of 12.73 GHz to 14.35 GHz. The antenna demonstrates a peak gain of 9.7 dBic and an average gain exceeding 7 dB. The proposed architecture provides a simple and effective solution for compact Ku-band MIMO systems, such as very small aperture terminals and satellite communication applications.
Language: English
Topic: Antenna Design and Analysis
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,645
OpenAlex ID: W7196998624