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Loop Antennas for Use On/Off Ground Planes

Journal Article · · IEEE Access
 [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
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Many applications benefit from the ability of an RFID tag to operate both on and off a conducting ground plane. This paper presents an electrically small loop antenna at 433 MHz that passively maintains its free-space tune and match when located a certain distance away from a large conducting ground plane. The design achieves this using a single radiation mechanism (that of a loop) in both environments without the use of a ground plane or EBG/AMC structure. An equivalent circuit model is developed that explains the dual-environment behavior and shows that the geometry balances inductive and capacitive parasitics introduced by the ground plane such that the free-space loop reactance, and thus resonant frequency, does not change. A design equation for balancing the inductive and capacitive parasitic effects is derived. Finally, experimental data showing the design eliminates ground plane detuning in practice is presented. The design is suitable for active, “hard” RFID tag applications.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1668691
Alternate ID(s):
OSTI ID: 1670721
OSTI ID: 1670743
Report Number(s):
SAND--2020-0375J; SAND--2020-4471J; SAND--2020-7343J; arXiv:1906.00267v2; arXiv:1906.00267v3; 685741
Journal Information:
IEEE Access, Journal Name: IEEE Access Vol. 8; ISSN 2169-3536
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

42 ENGINEERING
Antennas
antenna
dual-environment
equivalent circuits
geometry
integrated circuit modeling
loop antenna
mathematical model
metal tag
metals
on/off metal
platform-tolerant
radiofrequency identification (RFID)