A Compact Circular Polarization Antenna Using Folded Ground Elements

Kim, Kwang‐Seok; Kim, Ghoo; Chae, Soo-Chang; Jo, Hye-Won; Yu, Jong‐Won; Lee, Hanlim

doi:10.1109/tap.2019.2902736

Cited by 8 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2c shows the center frequencies of type-A, type-B and type-C, as well as the reference patch antenna. The detailed design information for a single folded ground element can be found in [22]. The designed single slotted patch with a folded ground shows a simulated 10 dB impedance bandwidth of 5.6% and a simulated peak gain of 6.1 dBi.…”

Section: Design Of the Proposed Structurementioning

confidence: 99%

“…However, these techniques require the direct manipulation of radiating elements, and thus the optimization of the beam patterns becomes difficult with respect to the UAV body effect. To overcome the issues of the antenna size and the UAV body effect, a folded ground element [22] can be effectively used. The folded ground structure can adjust operation frequency and antenna gain through the air-gapped ground elements, without modifying the radiation element.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in this paper, a new array architecture based on folded ground structures for UAV applications is presented. Although the concept of a folded ground element has been previously proposed [22], the extension of the folded ground structures to the array has not yet been studied. Further, the integration of the folded ground array structure with a switched-beam network such as the Butler matrix has not been investigated at all.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Compact Switched-Beam Array Antenna with a Butler Matrix and a Folded Ground Structure

Kim

Dong

et al. 2019

Electronics

Self Cite

View full text Add to dashboard Cite

A compact switched-beam array antenna, based on a switched Butler matrix with four folded ground antennas, is presented for unmanned aerial vehicle (UAV) applications. The folded ground structure, including a slotted patch radiator surrounded by multiple air-gapped ground layers, is adopted to maximize compactness. The extra ground layers provide extra capacitive coupling around the patch antenna, resulting in a down-shift of resonant frequency and a reduction in the antenna size. Also, to optimize aerial operation with a wider beam coverage, the 1 × 4 array is integrated with a switched Butler matrix controlled by a microcontroller unit (MCU). The choice of the Butler matrix reduces the complexity of beamforming circuitry and avoids the use of high-cost phase shifters requiring extra control-bit signals. Further, the array antenna is optimized for high isolation among the antenna ports and a minimal UAV body effect. Then, the proposed structure was verified at 1.96 GHz for test purposes only, and the array size, excluding the antenna case, was 2.16λo × 0.54λo × 0.07λo. The measured 10 dB impedance bandwidth for all antenna elements in the array was always better than 3.4%, and the isolation among the antenna ports was also better than 19 dB. The measured peak gain, excluding the loss of the switched Butler module, was about 9.98 dBi, on average. Lastly, the measured peak scan angles were observed at −39°, −17°, 9° and 31° according to switching modes.

show abstract

Section: Design Of the Proposed Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Compact Switched-Beam Array Antenna with a Butler Matrix and a Folded Ground Structure

Kim

Dong

et al. 2019

Electronics

Self Cite

View full text Add to dashboard Cite

show abstract

“…R ECENTLY, transparent antennas for use in various applications such as electronics products, mobile phones, and vehicle communication are being studied [1]. In these applications, a wideband high efficiency antenna is essential for improved communication.…”

Section: Introductionmentioning

confidence: 99%

Efficiency-Improved UWB Transparent Antennas Using ITO/Ag/ITO Multilayer Electrode Films

Kim

et al. 2021

IEEE Access

Self Cite

View full text Add to dashboard Cite

In this paper, a transparent antenna made with a new structure of ITO/Ag/ITO is proposed. Overcoming the physical limitations of transparency and conductivity is an important problem with transparent materials. By studying and comparing previously reported transprent materials, a transparent electrode with thin film Ag inserted between two layers of ITO instead of a single layer is selected for a highly efficient transparent antenna. This electrode has low sheet resistance (3.1 Ω/sq) relative to its high transparency (88 % at 550 nm), which is a factor that can increase the efficiency of the antenna. In general, it is difficult to measure sheet resistance (SR) using a 4-point DC probe for very thin films (thickness of transparent material is less than the skin-depth). Therefore, a form of reverse engineering that can estimate DC sheet resistance using RF SR was presented and verified. As a result, it was possible to predict and design the performance of the transparent antenna with the new material structure. The selected transparent material is applied to design the wideband transparent antenna and the design process for wideband performance is covered in the paper. The proposed antenna with ITO/Ag/ITO was implemented for verification. The peak efficiency of the fabricated antenna was 66 %, and the measured bandwidth was 123 % (from 2.5 GHz to 10.6 GHz), which is the best performance than previously reported transparent antennas.INDEX TERMS Transparent antenna, efficiency improvement, ultra-wideband, ITO/Ag/ITO films.

show abstract

“…In [9], a single-feed CP antenna was presented based on phase difference between tapped line and parallel coupled line. A CP antenna with folded ground element was designed in [10], in which the antenna was fed by two ports feeding network. To realize The associate editor coordinating the review of this manuscript and approving it for publication was Mingchun Tang .…”

Section: Introductionmentioning

confidence: 99%

A Compact Hollow Dual Circularly Polarized Antenna With Folded Coupled Feed Structure for Distance Detection Application

Ding

Geng-lu³

et al. 2020

IEEE Access

View full text Add to dashboard Cite

A wideband and dual circular polarization hollow patch antenna fed by a tapered fold coupled structure is presented for distance detection application. The proposed antenna consists of a gear-shaped ring radiation patch etched on a three-layer dielectric substrate, four tapered folded feedlines, a ring ground plane and a feeding network. To achieve right-handed circular polarization (RHCP) and left-handed circular polarization (LHCP) characteristics, four hybrids are employed. The proposed hollow antenna can be seamlessly integrated and installed under the cover of sharp shaped aerobat without effect on its flight characteristics. As a proof-of-concept, an antenna working at 1.8 GHz is prototyped and tested. The measured and simulated results show that the proposed antenna exhibits a wide impedance bandwidth of 270 MHz (1.695-1.965 GHz) and a wide 3-dB axial ratio (AR) beamwidth of 140 degree.

show abstract

A Compact Circular Polarization Antenna Using Folded Ground Elements

Cited by 8 publications

References 17 publications

Compact Switched-Beam Array Antenna with a Butler Matrix and a Folded Ground Structure

Compact Switched-Beam Array Antenna with a Butler Matrix and a Folded Ground Structure

Efficiency-Improved UWB Transparent Antennas Using ITO/Ag/ITO Multilayer Electrode Films

A Compact Hollow Dual Circularly Polarized Antenna With Folded Coupled Feed Structure for Distance Detection Application

Contact Info

Product

Resources

About