10.5 GHz Eight-Element Phased-Array Antenna System

Design, EM simulation, and circuit/field co-simulation of a circularly polarized 10.5 GHz phased array. The project integrates an eight-element microstrip array with a cascaded Wilkinson feed network and discrete phase-shifter blocks in Ansys HFSS and Keysight ADS.

Important

All values are pre-fabrication simulation results. Manufacturing tolerances, connector/fixture effects, measured S-parameters, anechoic-chamber patterns, and experimental validation are not included.

System workflow

1. Single element in HFSS: circularly polarized microstrip patch on RT/duroid 5880.
2. Array development: three-element coupling study followed by the final eight-element linear array.
3. Feed network in ADS: cascaded one-to-eight Wilkinson divider and phase-shifter blocks.
4. Co-simulation: HFSS Touchstone exports embedded into ADS for system-level steering evaluation.
5. Layout EM analysis: Momentum-based validation of key RF feed structures.

Design summary

Parameter	Value
Center frequency	10.5 GHz
Substrate	Rogers RT/duroid 5880
Relative permittivity	$\epsilon_r=2.2$
Substrate thickness	20 mil
Array size	8 elements
Element spacing	$0.4\lambda_0$
Reported maximum gain	14.06 dBi at the zero-phase state
Reported side-lobe level	13.81 dB
Demonstrated scan angles	approximately $\pm18^\circ$ and $\pm37^\circ$

The scan states use progressive phase shifts of $\pm45^\circ$ and $\pm90^\circ$. Reported active port matching remains below $-10$ dB for the demonstrated states.

Selected results

Steered 3D pattern	Active return loss	One-to-eight feed layout

Repository structure

.
├── ADS_Workspace/
│   ├── Project_Q1_wrk/        # Wilkinson divider schematics/layouts and data displays
│   ├── Project_Q2_wrk/        # Phase-shifter and integrated-system designs
│   └── snp/                   # HFSS/EM Touchstone exports used in co-simulation
├── HFSS_Project/
│   ├── Antenna.hfss
│   ├── Antenna_3_array.hfss
│   └── Antenna_8_array.hfss
├── Images/                    # Curated README figures
└── 10.5GHz_Phased_Array_Final_Report.pdf

Generated ADS datasets, Momentum caches, search history, local preferences, and simulation logs are excluded from version control. They are regenerated by ADS when the workspace is simulated.

Reproduce the project

1. Clone the repository.
2. Open the .hfss projects in a compatible Ansys Electronics Desktop release.
3. Open the ADS workspaces from ADS_Workspace/ in a compatible Keysight ADS release.
4. Keep the relative snp/ structure intact for the integrated schematics.
5. Regenerate datasets and Momentum output locally as needed.

The complete derivations, design sequence, and reported results are in 10.5GHz_Phased_Array_Final_Report.pdf.

Authors

• Moein Yousefinia
• Amin Behtoei

Sharif University of Technology — Electromagnetics Simulation Laboratory, Spring 2026.

No open-source license is granted by this repository unless a license file is added explicitly.