Wen-Shan Chen

Broadband design of the printed triangular slot antenna

We propose a new design of a broadband printed triangular slot antenna. By introducing a small rectangular slot protruding from the triangular slot, a new resonant mode in the vicinity of the fundamental resonant mode of the triangular slot can be excited. Also, good impedance matching of both the fundamental and the new mode can be obtained, which leads to the antenna having a much enhanced operating frequency bandwidth. In addition, by adjusting the structure of the microstrip-line feed near the side perpendicular to the microstrip line, a very broadband operation can be obtained. In general, the obtained broadband bandwidth can be more than four times that of a conventional printed wide rectangular slot antenna (/spl sim/20%). In the proposed design, an impedance bandwidth of about 84% has been obtained. Antenna designs and typical experimental results of the proposed antenna are shown and discussed.

Novel design of printed monopole antenna for WLAN/WiMAX applications

In recent years, wireless communications have progressed very rapidly. Wide-band antenna and multi-band antenna designs have become very important for wireless communications. Several promising monopole antennas for WLAN and WiMax applications have been reported recently. According to the WiMax protocol, there is three bands have been allocated for WiMax application: the lower band is 2.5-2.69 GHz, the middle band is 3.3-3.8 GHz, and the higher band covers from 5.25 GHz to 5.85 GHz. In practical use of WiMax applications, the lower band and the middle band are very close to each other, which lead to cause large effects of coupling and interference. To reduce the coupling and interference between the lower and middle bands, filters must be attached to the antenna to suppress the dispensable bands. However, the cost and the overall antenna size are increased due to the attached filters. In this paper, a CPW-fed printed monopole antenna for dual-band operation of 2.3-4.15 GHz and 4.93-5.83 GHz are proposed. Furthermore, by etching a pair of slits on the proposed monopole antenna, band rejection of frequency range from 2.93 GHz to 3.12 GHz can be achieved. Results show that, this novel design of CPW-fed monopole antenna is suitable for both WLAN and WiMax applications.

A study of the printed heart monopole antenna for IEEE 802.16a/UWB applications

The printed heart monopole antenna with bandwidth larger than 10 GHz has been proposed. In the case, the impedance bandwidth of about 137% has been obtained. The impedance bandwidth and peak gain obtained for the proposed antenna is better than the printed circular disc monopole antenna. And, the size of the proposed antenna is also smaller than the printed circular disc monopole antenna

Broadband design of the non-symmetric ground /spl lambda//4 open slot antenna with small size

In this article, a novel design of non-symmetric ground /spl lambda//4 open slot antenna with microstrip-line is proposed. Choosing the proper dimension of the rectangular conducting plate which connected to the open end of the 50-/spl Omega/ microstrip-line with printed on the opposite side of the FR4 substrate and open slot, one can obtain wide impedance bandwidth and miniaturized antenna area. The proposed antenna printed on FR4 and fed by 50-/spl Omega/ microstrip-line is investigated. The frequency range of the proposed antenna is about 2.2 /spl sim/ 6.1 GHz (94%), which can be applied to mobile wireless communication products on WLAN, Bluetooth and UWB.

A dual-band rejected cross semi-elliptic monopole antenna

In this paper, a novel dual-band rejected design for cross semi-elliptic monopole antenna is proposed and experimentally studied. The proposed antenna consists of a ultra-wideband cross semi-elliptic monopole antenna and the H-shaped slots, producing dual band-rejected characteristics and maintaining wideband performance and good omni-direction radiation. Therefore, this technique is suitable for creating multi-wideband antenna or for creating ultra-wideband (UWB) antenna with dual rejected-band. Details of the results for the proposed antenna are presented and discussed.

The Design of the cross semi-elliptic disc monopole antenna and the band-rejected cross semi-elliptic monopole antenna for UWB Applications

The cross semi-elliptic monopole antenna and band-rejected cross semi-elliptic monopole antenna with finite ground plane have been implemented and investigated, respectively. Experimental results show that the obtained impedance bandwidths of the two designs of antenna fit the requirement of the UWB applications. The dipole-like radiation patterns over the operating bandwidth are also shown in this paper. In addition, the proposed antenna also shows a compact size, compared to a corresponding elliptic monopole antenna. The proposed design of this antenna with finite ground is suitable for practical UWB applications

A chip resistor loading printed circular ring slot antenna for broadband CP operation

In this article, we propose a new design of a broadband CP (circular polarized) printed circular ring slot antenna. In the proposed design, a 3 dB axial-ratio CP bandwidth of about 6% has been obtained. In addition, the CP performance of the proposed antenna can be adjusted by changing the value of the chip resistor loading. Antenna designs and typical experimental results of the proposed antenna are shown and discussed.

Study of small open slot antenna for broadband operation

In this paper, we proposed a novel design to further enhance impedance bandwidth by varying the shape of the open slot. The measured bandwidth of the proposed antenna defined by return loss >10 dB is about 130%, from 2.3 to 10.9 GHz. The proposed open slot antenna will be implemented, and the detail antenna design and experimental results are presented and discussed.

Five-band printed monopole antenna for mobile phone application

This paper designs a monopole antenna on a commonly used FR4 substrate with width of 0.8 mm. The overall dimensions of the proposed antenna are 45×94.5 mm2, which can be easily applied in todays mobile devices. With small size of radiation element (45×12 mm2), the proposed antenna consists of three resonant paths that operate three resonant bands. By carefully adjusting the length of antenna paths and gap between antenna paths, the 6-dB operation bands (824–1000 MHz and 1710–2182 MHz) can be applied in GSM850, GSM900, PCS, DCS, and UMTS application bands. Both simulated and measured results are presented and discussed.

A Study on the UWB Cross Monopole Antenna with Dual-Band Rejected Operation

In this paper, a dual-band rejected design for cross monopole antenna is proposed and experimentally studied. To achieve wide and dual-band rejected operation, the proposed antenna consists of a UWB cross monopole antenna and the small h-shaped slots, producing dual band-rejected characteristics, maintaining wideband performance, and good omnidirectional radiation pattern. Details of the results for the proposed antenna are presented and discussed.