• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.39C no.3
• /
• pp.282-288
• /
• 2014

Recently there have been much interest in the GPS antenna performance improvement. In this paper, we propose very small patch antenna for GPS band. The proposed antenna resonance frequency was adjusted using the ground plane and variable capacitor connected the frame. The fabricated antenna was used a FR4 substrate by considering the difficulty and economical efficiency. Antenna measurement results was obtained good characteristics of VSWR 1.2, the passive antenna gain -0.60 dBi, the active antenna gain of 29 dB in center frequency of 1575.42 MHz GPS band.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.12 no.6
• /
• pp.2734-2747
• /
• 2018

In this study, a novel fractal ring antenna with a compact size of $24{\times}9{\times}0.8mm^3$ was configured using three iterations. Low profile, circular polarization, and measured operating bands (4.5-6.5 GHz) meet specifications of the upper band used in Wi-Fi and WiMAX applications. The antenna featured, stable radiation properties, especially gain and efficiency, in the notched band (92%). In deep, the antenna impedance, reflection coefficients, surface current distribution and circular polarization for the three iterations had been studied to improve the process of antenna design and its radiation characteristics.

• Journal of information and communication convergence engineering
• /
• v.14 no.4
• /
• pp.222-226
• /
• 2016

A design method for a compact square loop antenna fed by a microstrip (MS) line for indoor digital television (DTV) applications is proposed. The proposed antenna consists of a square loop, circular sectors, and an MS line. The square loop combined with circular sectors is printed on one side of a substrate, and a $75-{\Omega}$ MS line is printed on the other side. The circular sectors are used as a wideband balun or transition to connect the MS line and the square loop. A prototype of the proposed square loop antenna operating in the DTV band (470-806 MHz) is designed and fabricated on an FR4 substrate. Experimental results show that the proposed antenna has the desired impedance characteristics in the frequency band of 464-1,220 MHz (89.8%) for a voltage standing wave ratio (VSWR) of <2 covering the DTV band, and a broadside gain of 0.8-3.3 dBi in the DTV band.

• ETRI Journal
• /
• v.32 no.3
• /
• pp.472-474
• /
• 2010

In this letter, a novel zeroth-order resonant (ZOR) antenna on vialess co-planar waveguide (CPW) is proposed. It is based on a composite right/left-handed CPW transmission line. To achieve a compact size, this antenna utilizes the ZOR condition, and its reactive parameters determine the resonant frequency. Each unit cell is composed of a metallic top patch and meander lines. Since it is realized on the CPW single layer, the proposed antenna has the benefits of being a compact size and easy to fabricate. The bandwidth of 6.8% and efficiency of 62% are experimentally achieved. Its bandwidth is enhanced compared with other ZOR antennas.

• ETRI Journal
• /
• v.32 no.4
• /
• pp.610-613
• /
• 2010

This letter presents the design of a novel multiband USB dongle antenna with a compact ground plane. The radiating patch is composed of a modified meander-line monopole and a shorted loop to generate a dual-broadband resonance. The proposed antenna supports WiBro, Bluetooth, WLAN, WiMAX, and S-DMB services. The total dimensions of the fabricated antenna are 10 mm ${\times}$ 45 mm ${\times}$ 1 mm, the most compact size among multiband USB dongle antennas reported to date. The measured 10 dB reflection loss bandwidths are 20.8% (2.24 GHz to 2.76 GHz) and 20.2% (4.86 GHz to 5.95 GHz). The measured peak gain is 2.97 dBi, and efficiency is higher than 58%. In addition, the radiation pattern approximates an omnidirectional pattern.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.17 no.10
• /
• pp.2245-2251
• /
• 2013

In this paper, a design of a compact series-fed dipole pair(SDP) antenna with end-loaded rectangular patches is presented. In order to reduce the lateral size of a conventional SDP antenna, rectangular patches are end-loaded to the two dipole elements of the SDP antenna and a grooved ground plane is used by adding a patch at both ends of the ground plane. The effects of varying the length and width of the rectangular patches on the antenna performance such as input reflection coefficient are investigated. An optimized compact SDP antenna covering a frequency band ranging from 1.7 GHz to 2.7 GHz is designed and fabricated on an FR4 substrate. The total width of the fabricated prototype of the proposed antenna is reduced by approximately 14.3% compared to the conventional SDP antenna. Experimental results show that the antenna presents a 48.7% bandwidth in the range of 1.68-2.76 GHz and a stable gain of 5.6-6.0 dBi with minimal degradation. Moreover, a front-to-back ratio is improved by about 0.7 to 7.4 dB.

• Journal of electromagnetic engineering and science
• /
• v.17 no.4
• /
• pp.233-237
• /
• 2017

In this paper, a dual-band high frequency (HF) and ultra-high frequency (UHF) radio-frequency identification (RFID) tag antenna is presented that operates in the 13.56 MHz band as well as in the 920 MHz band. A spiral coil along the edges of the antenna substrate is designed to handle the HF band, and a novel meander open complementary split ring resonator (MOCSRR) dipole antenna is utilized to generate the UHF band. The dual-band antenna is supported by a single-feeding port for mono-chip RFID applications. The antenna is fabricated using an FR4 substrate to verify theoretical and simulation designs, and it has compact dimensions of $80mm{\times}40mm{\times}0.8mm$. The proposed antenna also has an omnidirectional characteristic with a gain of approximately 1 dBi.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.10 no.5
• /
• pp.557-564
• /
• 2015

In this paper, the compact antenna for handsets is designed using FR-4 substrate for LTE(905-960 MHz), WCDMA(1922.8-2167.2 MHz), DCS(1710.2-1879.8 MHz), US-PCS(1850.2-1989.8 MHz), WLAN(2400-2483 MHz). The CPW line with many advantages and a spiral geometry for miniaturization is proposed. Widths of a spiral line are constant, and three stubs are added to broaden the bandwidth. Lengths and widths of three stubs are gradually changed. And proposed antenna is optimized for VSWR<3, designed, and fabricated. The dimension of this antenna is only $40{\times}30{\times}1mm3$ which is compact. It has been demonstrated by experiment that the compact planar antenna can be used as the mobile communication LTE antenna for 4G.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.28 no.8A
• /
• pp.591-597
• /
• 2003

In this paper, a compact and broadband PIFA(Planar Inverted F Antenna) which has an additive short-circuit plate along the patch length was designed. For more compact PIFA short-circuit Plate along the patch width is reduced and an additive short-circuit plate along the patch length is used to broaden the bandwidth. The effect of an additive-short-circuit plate along the patch length was verified in single band PIFA and also verified in dual-band PIFA. The commercial software, IE3D, was used to design a PIFA and its performance was verified by comparing simulated results with measurement results.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.12 no.7
• /
• pp.1094-1101
• /
• 2001

The design of a compact folded patch antenna with moderately broad bandwidth is presented in this paper. The proposed antenna has radiation characteristics that are similar to the conventional monopole antenna. However, since this antenna is designed in a planar form, it has smaller size than that of a conventional monopole antenna. We have investigated the resonance frequency and bandwidth characteristics of the proposed antenna by changing the antenna design parameters. The proposed planar form of a monopole antenna in this paper has 1.17 GHz bandwidth with a matching circuit at the center frequency of 6.05 GHz.