TY - JOUR
T1 - Operating Band Shifting of Resistor-Loaded Antenna-Based Absorber by Using Parasitic Element Concept
AU - Zhekov, Stanislav Stefanov
AU - Mei, Peng
AU - Pedersen, Gert Frølund
AU - Fan, Wei
PY - 2022/8/1
Y1 - 2022/8/1
N2 - The size of an electromagnetic (EM) absorber is a critical design parameter since it determines the operating frequency band. The realization of lower starting frequency requires enlargement of the absorber which often is not desired. In this communication, a technique for overcoming this problem in the case of an absorber, constructed of a resistor-loaded wideband bowtie antenna, is studied. The method is about placing parasitic elements around the antenna in order to change its input impedance and thus to realize large shifting of the operating band of both single- and dual-polarized absorbers. Without using parasitic elements large move of the operating band can only be achieved by a considerable increase in the absorber’s size. However, the used method for absorption band shifting leads to shrinking of the bandwidth which means a compromise is to be made between these two parameters. For validation purposes, prototypes are fabricated and tested, and a good agreement between the simulation and measurement results is obtained.
AB - The size of an electromagnetic (EM) absorber is a critical design parameter since it determines the operating frequency band. The realization of lower starting frequency requires enlargement of the absorber which often is not desired. In this communication, a technique for overcoming this problem in the case of an absorber, constructed of a resistor-loaded wideband bowtie antenna, is studied. The method is about placing parasitic elements around the antenna in order to change its input impedance and thus to realize large shifting of the operating band of both single- and dual-polarized absorbers. Without using parasitic elements large move of the operating band can only be achieved by a considerable increase in the absorber’s size. However, the used method for absorption band shifting leads to shrinking of the bandwidth which means a compromise is to be made between these two parameters. For validation purposes, prototypes are fabricated and tested, and a good agreement between the simulation and measurement results is obtained.
KW - Absorption
KW - Bandwidth
KW - Broadband antennas
KW - Electromagnetic absorber
KW - Impedance
KW - Metals
KW - Resistors
KW - Substrates
KW - operating band shifting
KW - parasitic elements
KW - resistor
KW - wideband
UR - http://www.scopus.com/inward/record.url?scp=85127473482&partnerID=8YFLogxK
U2 - 10.1109/TAP.2022.3161357
DO - 10.1109/TAP.2022.3161357
M3 - Journal article
SN - 0018-926X
VL - 70
SP - 7294
EP - 7299
JO - I E E E Transactions on Antennas and Propagation
JF - I E E E Transactions on Antennas and Propagation
IS - 8
ER -