Preprint Article Version 1 This version is not peer-reviewed

A Generalized 90° Out-of-Phase Wilkinson Power Divider for Dual Port UHF CP RFID Antennae with variable Port Distance

Version 1 : Received: 11 May 2020 / Approved: 12 May 2020 / Online: 12 May 2020 (12:48:32 CEST)

How to cite: Sovis, W.A.; Jayasooriya, M. A Generalized 90° Out-of-Phase Wilkinson Power Divider for Dual Port UHF CP RFID Antennae with variable Port Distance. Preprints 2020, 2020050214 (doi: 10.20944/preprints202005.0214.v1). Sovis, W.A.; Jayasooriya, M. A Generalized 90° Out-of-Phase Wilkinson Power Divider for Dual Port UHF CP RFID Antennae with variable Port Distance. Preprints 2020, 2020050214 (doi: 10.20944/preprints202005.0214.v1).

Abstract

In this paper a microstrip Wilkinson power divider with a 90° phase delay at one output port is proposed to obtain circular polarization to feed a dual port RFID antenna. The 90° phase delay was obtained by embedding an extra quarter wavelength at one port of the Wilkinson power divider. The feeding circuit is then mounted on the ground plane of the microstrip antenna feeding the radiating patch directly through the ground plane and dielectric layer thus reducing any fringing effect and resulting a mechanically compact unit. The proposed feeding method offers better expectation of antenna performance with minimal attenuation and coupling losses. The design process generalizes geometric pa- rameters of the Wilkinson power divider for variable port distances. The paper considers both UK and US RFID center frequencies, 870 MHz and 915 MHz respectively. Numeri- cally computed values for geometric design parameters for both frequencies are tabled as future design tools for port distances varying from 18 mm up to 34 mm at 870 MHz and 17 mm up to 32 mm at 915 MHz. Simulation results indicate a return loss (S11) of -20 dB and -26 dB at 870 MHz and 915 MHz operational frequencies respectively at 270° angled quarter wavelength.

Subject Areas

Wilkinson power divider; RFID; dual port feeder; port distance; circular polarization

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.