A Duplexing Hybrid Slot Antenna Design with High-Isolation for Short-Range Radar Detection and Identification Applications at 24 GHz Band
Journal
IEEE Transactions on Antennas and Propagation
Date Issued
2021
Author(s)
Abstract
This paper presents a duplexing hybrid antenna architecture for short-range radar systems with high isolation and low loss between the two transmitting (TX) and receiving (RX) ports. The antenna utilizes a single slot for common resonance shared by the two TX and RX port excitations. These two ports were constructed through two parallel microstrip lines crossing over the specified shaped slot. The feeding structures of these two microstrip feedings and the separation are optimally designed to ensure the mutual coupling signals out-of-phase, and therefore the signal cancellation can be achieved, leading to a high isolation between these two ports. In this design, the slot length is 0.92λ at 24.125 GHz, forming an equivalent short circuit at the other port. Given the initial design criteria, the design with the optimal isolation could readily be found by minimal full-wave simulations. Meanwhile, the equivalent circuit model was used to investigate the working principles and to improve the isolation bandwidth and impedance matching at the central frequency. The measured maximum isolation is 70 dB at 24.125 GHz. The RF front-end modules with TX and RX amplifiers are also integrated to validate its feasibility for the radar system application. The mechanisms to widen the isolation bandwidth are also addressed. IEEE
Subjects
Antenna
Antennas
Couplings
destructive cancellation
duplexer
equivalent-circuit model
Integrated circuit modeling
Microstrip
Microstrip antennas
Radar antennas
short-range radar
slot antenna
Slot antennas
Antenna feeders
Bandwidth
Circuit simulation
Equivalent circuits
Integrated circuit design
Microwave antennas
Timing circuits
Antenna design
Destructive cancelation
Duplexers
Duplexing
Equivalent circuit model
High isolation
Micro-strips
Radars antennas
Short-range radars
Type
journal article