Abstract
Three patch antennas suitable for integration and operation in a compact 24 GHz wireless sensor node with radar and communication functions are designed, characterized, and compared. The antennas are manufactured on a low loss glass wafer using thin film (BCB/Cu) wafer level processing (WLP) technologies. This process is well suited for 3D stacking. The antennas are fed through a microstrip line underneath a ground plane coupling into the patch resonator through a slot aperture. Linear polarization (LP), dual mode (DM) operation, and circular polarization (CP) are achieved through the layout of the slot aperture and rectangular patch dimensions. Antenna gain values of ∼5.5 dBi are obtained in addition to the 10 dB impedance bandwidths of 900 MHz and 1.3 GHz as well as 500 MHz CP bandwidth with a 3 dB axial ratio for the LP, DM, and CP patch antennas, respectively.
Highlights
Autarkic wireless sensor networks are becoming widespread in industrial applications and have been in the focus of many research activities [1]
The antennas are manufactured on a low loss glass wafer using thin film (BCB/Cu) wafer level processing (WLP) technologies
Antenna gain values of ∼5.5 dBi are obtained in addition to the 10 dB impedance bandwidths of 900 MHz and 1.3 GHz as well as 500 MHz circular polarization (CP) bandwidth with a 3 dB axial ratio for the Linear polarization (LP), dual mode (DM), and CP patch antennas, respectively
Summary
Autarkic wireless sensor networks are becoming widespread in industrial applications and have been in the focus of many research activities [1]. Highly integrated sensor node platforms comprise compact 3D stacks, where the antenna is integrated in one of the stack modules [6,7,8]. For this purpose, antenna designs suitable for 3D stacks and thin film processing have been reported. The top module comprises the components (e.g., the active RFICs and embedded passive components) of the RF front-end including the International Journal of Microwave Science and Technology integrated planar antenna. Three 24 GHz patch antennas with different modes of operation which are suitable for integration in the top RF module of the wireless sensor node are designed and characterized.
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