A small circularly polarized tag antenna on a high-dielectric substrate

2011 ◽  
Vol 53 (10) ◽  
pp. 2423-2425 ◽  
Author(s):  
Chihyun Cho ◽  
Seungbeom Ahn ◽  
Ikmo Park ◽  
Hosung Choo
Keyword(s):  
Dielectric Substrate ◽  
Circularly Polarized ◽  
High Dielectric

Compact Dual-Band Proximity-Fed Circularly Polarized Patch Antenna for BDS Applications

Frequenz ◽  
2015 ◽  
Vol 69 (9-10) ◽  
Author(s):  
Jianxing Li ◽  
Bin He ◽  
Jing Fang ◽  
Anxue Zhang
Keyword(s):  
Patch Antenna ◽  
Branch Length ◽  
Axial Ratio ◽  
Dielectric Substrate ◽  
Satellite System ◽  
Antenna Design ◽  
Dual Band ◽  
Antenna Aperture ◽  
Small Surface ◽  
Circularly Polarized

AbstractThis paper presents a compact dual-band proximity-fed circularly polarized (CP) patch antenna for BeiDou Navigation Satellite System (BDS) operation at B1 (1,561 MHz) and B3 (1,268 MHz) bands. The antenna aperture is minimized down to 26.6 mm (λ/9 at the B3 band) in diameter and 12 mm (λ/20 at the B3 band) in thickness using high permittivity dielectric substrate and meandered slots. The antenna design features that the resonant frequency in the higher band could be tuned independently by adjusting the branch length and breadth without affecting the lower band. To achieve right-handed CP (RHCP) radiation property, quadrature phase feeding is employed together with a broadband 0°–90° hybrid utilizing a small surface mount LTCC hybrid coupler chip. Experimental results show that the RHCP gain maintains larger than 1.5 dBic and the axial ratio (AR) stays below 3 dB within the B1 and B3 bands. This antenna design is a promising candidate for small BDS arrays as well as other dual-band BDS applications.

A printed wide-beamwidth circularly polarized antenna via two pairs of radiating slots placed in a square contour

2016 ◽  
Vol 9 (3) ◽  
pp. 649-656 ◽  
Author(s):  
Neng-Wu Liu ◽  
Lei Zhu ◽  
Wai-Wa Choi
Keyword(s):  
Ground Plane ◽  
Large Angle ◽  
Axial Ratio ◽  
Dielectric Substrate ◽  
Slot Antenna ◽  
Radiation Patterns ◽  
Circularly Polarized ◽  
Low Profile ◽  
Orthogonal Pairs ◽  
Good Agreement

A low-profile circularly polarized (CP) slot antenna to achieve a wide axial-ratio (AR) beamwidth is proposed in this paper. The radiating patch consists of two orthogonal pairs of parallel slots etched symmetrically onto a ground plane. Firstly, our theoretical study demonstrates that the CP radiation can be satisfactorily achieved at the broadside, when the vertical and horizontal paired-slots are excited in the same amplitude with 90° phase difference. Secondly, the principle of CP radiation of the proposed antenna on an infinite ground plane is described. Through analyzing the spacing between two parallel slots, the |Eθ| and |Eφ| radiation patterns can be made approximately identical with each other over a large angle range. As such, the slot antenna achieves a wide AR beamwidth. After that, the 3 dB AR beamwidth with respect to the size of a finite ground plane is investigated to constitute a practical CP antenna on a finite ground plane. In final, the proposed CP antenna with a 1–4 probe-to-microstrip feeding network is designed and fabricated on a finite ground plane of a dielectric substrate. Measured results are shown to be in good agreement with the simulated ones about the gain, reflection coefficient, AR bandwidth, and radiation patterns. Most importantly, a wide 3 dB AR beamwidth of 126° and low-profile property with the height of 0.036λ0 are achieved.

Triboelectrically boosted SERS on sea-urchin-like gold clusters facilitated by a high dielectric substrate

Nano Energy ◽  
2019 ◽  
Vol 64 ◽  
pp. 103959 ◽  
Author(s):  
Haitao Li ◽  
Han Dai ◽  
Yihe Zhang ◽  
Yih Hong Lee ◽  
Charlynn Sher Lin Koh ◽  
...  
Keyword(s):  
Sea Urchin ◽  
Dielectric Substrate ◽  
Gold Clusters ◽  
High Dielectric

scholarly journals Circularly Polarized Split Ring Resonator Loaded Slot Antenna

2018 ◽  
Vol 7 (5) ◽  
pp. 1-6 ◽  
Author(s):  
A. R. Parvathy ◽  
V. G. Ajay ◽  
M. Thomaskutty
Keyword(s):  
Ground Plane ◽  
Dielectric Substrate ◽  
Open Loop ◽  
Ring Resonators ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Split Ring ◽  
Circularly Polarized ◽  
Split Ring Resonators ◽  
Rectangular Slot

A compact circularly polarized printed slot antenna operating at 2.45 GHz is reported. The antenna consists of a pair of rotated square split ring resonators (SRR) inside a rectangular slot etched on the ground plane of an FR-4 dielectric substrate. A microstrip open-loop feed is etched on the backside of the dielectric substrate to feed the slot and the split ring resonators. The overall size of the antenna is 60x42x1.6 mm3. The measured -10dB impedance bandwidth is 10.48% (2.38-2.64 GHz) and the measured 3dB axial ratio (AR) bandwidth covers the entire impedance bandwidth.

Broadband CPW-Fed Circularly Polarized Square Slot Antenna for Universal UHF RFID Handheld Reader

2021 ◽  
Vol 36 (6) ◽  
pp. 747-754
Author(s):  
Rui Ma ◽  
Quanyuan Feng
Keyword(s):  
Low Cost ◽  
Coplanar Waveguide ◽  
Impedance Matching ◽  
Axial Ratio ◽  
Polarization Characteristic ◽  
Dielectric Substrate ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Uhf Rfid ◽  
Circularly Polarized

This paper presents a new coplanar waveguide (CPW)-fed circularly polarized square slot antenna (CPSSA). The proposed antenna uses an inverted Z-shaped feedline protruded from the signal line of the feeding CPW. Circularly polarized (CP) radiation can be achieved by adequately inserting the arc-shaped grounded strip into the upper right corner of the square slot. The widened vertical tuning stub on the L-shaped grounded strip can improve impedance matching and axial ratio (AR) performance. The measured results indicate that the 10 dB impedance bandwidth is 620 MHz (652-1272 MHz), and the 3 dB axial ratio bandwidth is 320 MHz (840-1160 MHz), which has a broadband characteristic. In the range of the universal UHF RFID band, the measured peak gain is about 4.4 dBi. The proposed CPSSA uses low-cost FR4 material as the dielectric substrate. The overall size of the antenna is 119 × 119 × 0.5 mm3. The proposed antenna has a simple structure, easy processing, good performance, wide operating bandwidth, and dual circular polarization characteristic. It can be applied to the universal UHF RFID handheld reader environment.

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