• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.6
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• pp.505-508
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• 2017

This paper analyzes the effect of metal dummy structures in CMOS on antenna performances of a sub-terahertz on-chip microstrip patch antenna. A 400-GHz on-chip antenna is designed in a 45-nm CMOS process, and the resonance frequency and efficiency of the antenna are analyzed depending on the density of metal dummy structures. Antennas integrated with an oscillator are designed and fabricated for verification, and measurements are performed using quasi-optical methods with an FTIR and bolometer. The measurement results shows that the radiated power drops from 420 nW to 90 nW by 6.8 dB due to the dummy structures with the density of 27 %.

• Journal of IKEEE
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• v.12 no.3
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• pp.144-150
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• 2008

This paper describes the design of a coplanar-stripline(CPS) antenna without via hole in microstrip patch type for 910MHz RFID tags using the HFSS simulator. In order to obtain the simplified fabrication design of the antenna, we have used only an impedance matching network to match the impedance of a RFID-tag chip to that of the antenna, not using bandpass filter(BPF). In advance of the optimized antenna design, we have obtained and shown a good agreement compared with the published antenna for 5.8GHz in order to verify the simulation parameters in the HFSS. Based on the verified simulation parameters in the HFSS, we have designed and optimized the 910MHz-CPS-type microstrip patch antenna. The designed simulation results of the antenna show that the proposed antenna is very proper for RFID tags with the 910MHz center frequency without via hole in the microstrip patch antenna.

• ETRI Journal
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• v.30 no.4
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• pp.600-602
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• 2008

A very small patch-type RFID tag antenna (UHF band) using ceramic material mountable on metallic surfaces is presented. The size of the proposed tag is 25 mm${\times}$25 mm${\times}$3 mm. The impedance of the antenna can be easily matched to the tag chip impedance by adjusting the size of the shorting plate of the patch and the size of the feeding loop. The measured maximum reading distance of the tag at 910 MHz was 5 m when it was mounted on a 400 mm${\times}$400 mm metallic surface. The proposed design is verified by simulation and measurements which show good agreement.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.8
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• pp.765-768
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• 2015

In this paper, two ports feeding a microstrip patch antenna using a quadrature hybrid circuit was proposed to enhance the bandwidth for the global positioning system(GPS). The square patch was designed, and the probe feeding was applied. The quadrature hybrid chip circuit for two-port feeding was designed, and output ports that have a 90-degree phase difference feed to the patch antenna. The designed patch and quadrature hybrid circuit were implemented on an FR4 board, and were combined. The measurement of the bandwidth within a voltage standing wave ratio(VSWR) of 2: 1 and axial ratio(AR) in 3dB were 29 %BW(1,230~1,700 MHz) and 15.87 %BW(1,400~1,650 MHz), respectively. The peak gain at the GPS center frequency was measured at 2.75 dBi in an anechoic chamber.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.17 no.5
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• pp.128-134
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• 2018

In this paper, two ports feeding a microstrip patch antenna using a quadrature hybrid circuit was proposed to enhance the bandwidth for the global positioning system(GPS). The square patch was designed, and the probe feeding was applied. The quadrature hybrid chip circuit for two-port feeding was designed, and output ports that have a 90-degree phase difference feed to the patch antenna. The designed patch and quadrature hybrid circuit were implemented on an FR4 board, and were combined. The measurement of the bandwidth within a voltage standing wave ratio(VSWR) of 2:1 and axial ratio(AR) in 3dB were wide band as 29% BW (1,230~1,700 MHz) and 15.87% BW (1,400~1,650 MHz), respectively. Antenna gain were measured 2.75dBi at the center frequency.

• ETRI Journal
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• v.30 no.4
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• pp.597-599
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• 2008

This letter presents the design of a small and low-profile RFID tag antenna in the UHF band that can be mounted on metallic objects. The designed tag antenna, which uses a ceramic material as a substrate, consists of a radiating patch and a microstrip line with two shorting pins for a proximity-coupled feeding structure. Using this structure, impedance matching can be simply obtained between the antenna and tag chip without a matching network. The fractional impedance bandwidth for $S_{11}$ <3 dB and radiation efficiency are about 1.4% and 56% at 911 MHz, respectively. The read range is approximately from 5 m to 6 m when the tag antenna is mounted on a metallic surface.

• ETRI Journal
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• v.41 no.2
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• pp.262-269
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• 2019

This paper introduces a low-cost, high-performance mmWave antenna array module at 77 GHz. Conventional waveguide transitions have been replaced by 3D CPW-microstrip transitions which are much simpler to realize. They are compatible with low-cost substrate fabrication processes, allowing easy integration of ICs in 3D multi-chip modules. An antenna array is designed and implemented using multilayer coupled-fed patch antenna technology. The proposed $16{\times}16$ array antenna has a fractional bandwidth of 8.4% (6.5 GHz) and a 23.6-dBi realized gain at 77 GHz.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.13 no.1
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• pp.46-52
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• 2014

In this paper, we present a design of meander type microstrip patch antenna which has the best quality in RFID approved international standard of 910MHz broadband, usable in metal environment. In order to be fit into the commercial tag chip on the antenna, a square shaped feeder is installed on the main body as well as in the main body. In addition, a multi meander type patching element was designed in order to reduce the main body effectively. Three antennae, Cases 1, 2 and 3, were designed and compared in the areas of broad band width, effectiveness or recognition distance according to their sizes and number of folds. The measurement result of Case 3 was determined to be the best. It was confirmed that mostly the efficiency and characteristic gain change due to antenna size and number of folds in meander type influenced the antenna recognition distance.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.2
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• pp.141-146
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• 2009

A triangular microstrip antenna with T-shaped slits is proposed for tunable dual-band applications. The proposed antenna is designed using chip capacitors as a prototype. From this result the capacitor can be replaced to a varactor diode to control capacitance value. Since the input impedance of the antenna can be varied with the value of the chip capacitors on the T-shaped slits, the resonant frequency may be changed. The return losses are better than 10 dB at the lower band of $0.78{\sim}1.21$ GHz and 20 dB at the upper band of $1.97{\sim}2.17$ GHz, respectively. This antenna has the bandwidth of about 10 MHz and 50 MHz at each band. The peak gains of the antenna yield 0 dBi at the lower band and 3 dBi at the upper band, respectively. Details of the antenna design are described, and its performances are presented and analyzed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.1
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• pp.119-124
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• 2014

In this paper, A GSm/WCDMA band antenna which can be confirmed positioning information of a container by using the GPS/GLONASS bands on one board and can be sent the positioning information to the mobile communication network in real time is designed. A microstrip patch antennas which supports dual-band (GPS and GLONASS) was optimized. The antenna size is $25{\times}25{\times}5[mm]$. A chip monopole antennas which supports dual-band (GSM and WCDMA) was optimized. The antenna size is $27{\times}8{\times}3.2[mm]$. To amplify the Satellite reception signal level, two-stage low noise amplifier(LNA) was designed. The LNA gain is 27[dB]. The size of Jig for antennas measuring is $100{\times}30{\times}1[mm]$.