Yeonsik Yu

Design of CP Antenna with a Fenced Ground for a Handheld RFID Reader

A design of circular polarized(CP) microstrip antenna with a fenced ground is proposed and the equivalent circuit is derived. The antenna consists of a square radiating patch with a pair of truncated corners, a bottom ground and a fenced ground. From conducted experiments, a patch size reduction using the metal fence as large as 25 % from the conventional patch structure, has been obtained. The input admittance of the extracted equivalent circuit is shown to agree with that of the measurement. And the design parameters and performance of the proposed antenna are examined by analyzing the fields and circuit behaviors.

Design of an Internal DTV antenna for portable multimedia player

A novel low-profile metal-plate monopole antenna with system ground for DTV signal reception in the UHF band is proposed. The monopole antenna is easily constructed by a folded rectangular patch with two slits, and has a compact size of 65 times 25 times 5 mm3. The ground plane of this antenna is made of FR-4 substrate (thickness of 0.8 mm). The measured return loss for the operating frequencies over the DTV band (465-850 MHz) is better than -10 dB and maximum radiation gain is 4.5 dBi. The geometrical parameters and the experimental results of the proposed antenna are discussed.

Broadband Internal Antenna for Mobile DTV Handsets

Abstract— A novel low profile metal plate monopole antenna with L-shape silts for mobile handsets operating DTV (470–740 MHz) band is proposed. The antenna can be easily constructed by folding the planar patch with the silt and occupies a small volume of 56× 23 × 10mm. The measured return losses for operating frequencies over the DTV band are better than −10 dB. The proposed antenna shows omni-directional or monopole-like radiation patterns and has good antenna gain over the frequencies of interest. The antenna can be applied to DTV application.

Design of a Low-profile Antenna for DTV Application

A low-profile metal-plate Inverted-L antenna with system ground for DTV signal reception in the UHF band is proposed. The proposed Inverted-L antenna which is constructed by folding a square patch with two notches has a small size. The measured return loss of the proposed antenna over the DTV signal reception band (470 - 750 MHz) is better than 10 dB. The antenna has good radiation pattern even for such a small size.

Dual-band Dipole Antenna for ISO 18000-6/ISO 18000-4 Passive RFID Tag Applications

In this paper, a slot coupled dipole antenna was presented for dual band passive RFID tag applications. Structures using a slot coupled feed and a resonator are explored to achieve dual band operation. It shows good impedance and radiation characteristics from 860 MHz to 960 MHz (ISO 18000-6) and from 2.40 GHz to 2.50 GHz (ISO 18000-4). The return loss is verified by comparing the calculations and measurements, which show good agreement. Radiation patterns are omni-directional for operation frequencies. Numerical results are calculated using Ansoft HFSS (High Frequency Structure Simulator)

An integrated two-wire helical antenna for Bluetooth application

An integrated two-wire helical antenna for Bluetooth band (2.4 ~ 2.483 GHz) is introduced. The proposed antenna is implemented on the printed circuit board (PCB) for Bluetooth. The antenna has modified two-wire helical structure to maximize the bandwidth in spite of small PCB volume. The dimension of proposed antenna on standard FR4 substrate is 12 mm times 4 mm times 1.6 mm. The impedance bandwidth (VSWR<2) of proposed antenna is about 150 MHz (2.39 ~ 2.54 GHz). Radiation patterns are nearly omni-directional for operation frequencies.

Design of an internal antenna for DVB-H mobile application

An internal antenna with a system ground for DVB-H application is proposed. The proposed antenna consists of a meander radiator and two stubs. The designed antenna has a broad impedance bandwidth to cover the whole DVB-H band. Therefore, the proposed antenna can be a good candidate for DVB-H mobile handset application since its size is small enough to satisfy the size constraint imposed on a mobile handset.