2022 International Conference on Emerging Technologies for Communications (ICETC 2022)
1

Measurement results for single-layered reflectarray antenna
with Split Rectangular Loop Elements
Masayoshi TAKAO†a), Student Member, Yusuke KAIMORI†, Student Member, and Shigeru MAKINO†, Fellow
Member

2. Reflectarray design
The previously proposed split rectangular loop element isshown in Fig. 1(a). This element shape enables 360°
reflection phase-region coverage and independent phase
control for each polarization [2]. The mirror surface
designed based on this element shape is shown in Fig. 1(b).
The aperture of the mirror surface is approximately 19.9λ0,
where λ0 is the wavelength corresponding to the designfrequency. The beams of each polarization are designed tobe a beamwidth (3.04°) apart from each other.
ℓB1/2
ℓA3

ℓB2/2
ℓB3

ℓA1

ℓA2

V_Co-pol (Measured)
H_Co-pol (Measured)

V_Cr-pol (Analysis)
H_Cr-pol (Analysis)0-10-10-20-30-40-50

V_Cr-pol (Measured)
H_Cr-pol (Measured)-20-30-40-50-60-40-200204060-60-40

Azimuth[deg](a) Analysis-2002040

Azimuth[deg](b) MeasuredFig. 2 Radiation pattern of V-pol and H-pol

4. Conclusion
A reflectarray antenna was designed, fabricated, andmeasured using the proposed element shape. Based on themeasurement results, it is possible to change the desired
beam direction depending on the polarization, and theeffectiveness of the proposed element shape is demonstrated.
Acknowledgments

ℓB4

ℓA4

V_Co-pol (Analysis)
H_Co-pol (Analysis)0

Amplitude[dB]

Reflectarray antennas that change the beam direction
depending on the polarization have been investigated [1]. Ina previous study, split rectangular loop elements [2] wereproposed as an element shape that satisfies the requirements,
even at the resonant element spacing, where the grating lobe
does not propagate in the dielectric [3]. In this report, wepresent the measurement results for a reflectarray designed
using this element shape.

measured values. For the measured values, the nearby
patterns generally agreed with the analytical values. The
graphs also show that the sidelobe and Cr-pol aresufficiently suppressed. Furthermore, the beam direction isconsistent with the design values in the analysis andmeasurements, and the beam swings in different directions
for each polarization.

Amplitude[dB]

1. Introduction

This study was supported by JSPS (20K04491).

PYReferences
PX(a) Element shape(b) Mirror surface

Fig. 1 Reflectarray design

3. Measurement results[1] M. Fukaya, et al., “A New Satellite Antenna Concept Using
Reflectarray Antennas,” ISAP2019, October, 2019.
[2] M. Takao, et al., “A Single-Layered Reflectarray Antenna with Split
Rectangular Loop Elements,” AP-S2022, July, 2022.
[3] Y. Fuji, et al., “High-Efficiency and Low-Side-Lobe Reflectarray
Antenna,” ISAP2014, December, 2014.

A prototype of the designed mirror surface was fabricated,analyzed, and measured. The following graphs show theradiation patterns in the Azimuth direction at f0. Fig. 2(a)shows the analytical values, and Fig. 2(b) shows the†The author is with Kanazawa Institute of Technology …

a) E-mail: b1833012@planet.kanazawa-it.ac.jp

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