Frequency-diverse multimode millimetre-wave constant-ϵ_r lens-loaded cavity

Area of Science:

• Electromagnetics and Wave Propagation
• Antenna Theory and Design
• Wireless Communication Systems

Background:

• Direction of Arrival (DoA) estimation is crucial for 5G and beyond wireless systems.
• Conventional DoA estimators often require complex hardware with multiple antennas and receivers.
• Millimeter-wave frequencies offer high bandwidth but present unique propagation challenges.

Purpose of the Study:

• To present a novel physical frequency-diverse multimode lens-loaded cavity for simplified DoA estimation.
• To enhance spatial incoherence of radiation modes using a constant dielectric lens.
• To demonstrate a cost-effective and simpler hardware solution compared to traditional DoA methods.

Main Methods:

• Designed and implemented a frequency-diverse multimode lens-loaded cavity.
• Utilized an electrically-large cavity to generate spatio-temporally incoherent radiation masks via frequency diversity.
• Incorporated a spherical constant dielectric lens before the cavity's radiating aperture.
• Analyzed the synthesized quasi-random sampling bases and mode orthogonality.

Main Results:

• Achieved enhanced spatial incoherence of radiation modes with the addition of the dielectric lens.
• Demonstrated a simplified hardware design requiring only a single lens and output port.
• Observed up to a 6 dB increase in peak gain for synthesized sampling bases.
• Verified accurate DoA estimation capabilities despite using a subset of theoretical modes.

Conclusions:

• The proposed lens-loaded cavity offers a simpler and more cost-effective approach to DoA estimation in millimeter-wave bands.
• The spherical dielectric lens effectively enhances spatial incoherence and signal-to-noise ratio (SNR), improving estimation accuracy.
• This architecture is well-suited for 5G and future wireless communication systems requiring efficient DoA localization.