Amnoiy Ruengwaree

Dual band microstrip antenna with triangular tuning stub for WLAN applications

This paper presents the microstrip antenna with triangular tuning stub which designed and simulated by using IE3D program. This antenna is designed for 50 Ohms impedance microstrip line for dual band frequency, 2.297-2.952 GHz and 5.138-6.051 GHz which supports WLAN communications coverage IEEE 802.11b/g (2.4-2.4835 GHz), IEEE 802.16a (5.15-5.35 GHz) and IEEE 802.16d (5.7-5.9 GHz). The bandwidth at lower resonance frequency of this antenna is 0.655 GHz, while upper resonance frequency is 0.913 GHz. The simulation results show that the lower and upper resonance frequencies are agreed with the measurement results.

Increasing bandwidth of flambeau-shape monopole antenna for UWB application

This article presents the increasing bandwidth of a flambeau-shaped monopole antenna for UWB application. The prototype antenna has small size of about 38 × 45 mm2 and fabricated on a simple FR-4 PCB with a CPW-fed structure. This antenna is supported UWB (Ultra-wideband) applications as required by the Federal Communications Commission (FCC) with the frequency range of about 3.1–10.6 GHz, covering of IEEE 802.15.3a and also IEEE 802.16a standards. The structural simulation technique was used to analyze the antenna characteristics, utilizing the commercial software Computer Simulation Technology (CST). The measured input impedance bandwidth (return loss < −10 dB) of the prototype antenna was 162.52% for the frequency range of about 2.49 – 24.09 GHz. The radiation patterns were bidirectional along the proposed frequency band.

T-shape slot in rectangular slot antenna to enlarge bandwidth for broadband communication

This article presents the study of feed line stub model in T-shape tuning CPW-fed Rectangular Slot antenna. The structure of the antenna consists of T-shape tuning rectangular stub antenna on the same alignment with the ground plane. This is to apply with the Wide Band Antenna such as IEEE 802.11b/g that has two frequencies which are 2.4 GHz (2.40 – 2.48 GHz) IEEE 802.16e 3.5 GHz (3.4 – 3.69 GHz), IEEE802.11j (4.90 – 5.091 GHz), Public Safety Frequency (4.94 – 4.99 GHz), IEEE802.16a 5.2 GHz (5.13 – 5.35 GHz). And at the frequency 5.8 GHz (5.7 – 5.9 GHz) by using Print Circuit Board (PCB) with the FR4 substrate. The antenna design to study the expanding of bandwidth of the antenna employed the experiences method together with CST program to adjust the size of T-shape tuning CPW-fed Rectangular Slot that added in the Rectangular stub of the antenna until gaining the wider value of bandwidth and lowest return lost trough all the frequencies used. From the result of the study, it was found that after adjusted the structure of both points of antenna that made the bandwidth value equal to 145.68 % (1.42 – 6.36 GHz).

The bandwidth expansion of double-horn antenna with a squared probe for wireless communication applications

This article is presented the bandwidth expansion of double-horn antenna with a squared probe for wireless communication applications by using the basic structure of a monopole antenna with a double-horn waveguide to increase the gain and spread the applied frequency in the desired spectrum. The entire structure of the antenna was fabricated on a metal sheet with a thickness of t = 0.2 mm. It was designed with the CST program to improve impedance bandwidth to support wireless communication devices and WiFi system. The results of measurement found that the antenna had an impedance bandwidth of 70.99% (1.59–3.34 GHz), which conformed to support wireless communication standard.

The Tiered Umbrella-Shaped Monopole Antenna for RFID System Applications with 867 MHz

This paper presents the Tiered Umbrella - Shaped Monopole Antenna Applications for Industrial Scientific and Medical (ISM) with etching technique for RFID Applications. Antenna analysis and design are simulated by CST (Computer Simulation Technology) program for calculate suitable parameters and compare with real antenna. The prototype antenna structure was designed on print circuit board with FR4 with dielectric constant of 4.3 and thickness (h) of 1.6 mm. From measurement result, it was found that the impedance bandwidth of an antenna to be 42.04% (620-950 MHz) which cover requires a frequency is 867 MHz, the radiations pattern of omnidirectional style and gain 3.21 dBi for support RFID frequency.

The Dual Piston-Shaped Monopole Antenna for Wireless Communication Applications

This paper presents the dual piston-shaped monopole antenna for wireless communication applications. The analysis of optimization parameters used the empirical method and simulation technique with CST program. The design of matching impedance of proposed antenna is 50 ohms. The applications of prototype antenna are RFID, WLAN ( IEEE 802.11a/j ) and WiMAX ( IEEE 802.16e ) system. The simulation results show the bandwidth of proposed antenna is 2.93 GHz (2.80 – 5.73 GHz) by the average gain is 4.27 dBi and radiation pattern is omni-directional.