Abstract
A codesigned compact dual-band filtering antenna incorporating a PIN diode for 2.45/5.2 GHz wireless local area network (WLAN) applications is proposed in this paper. The integrated filtering antenna system consists of a simple monopole radiator, a microstrip dual-band band-pass filter, and a PIN diode. The performance of the filtering antenna is notably promoted by optimizing the impedance between the antenna and the band-pass filter, with good selectivity and out-of-band rejection. The design process follows the approach of the synthesis of band-pass filter. In addition, the PIN diode is incorporated in the filtering antenna for further size reduction, which also widens the coverage of the bandwidth by about 230% for 2.4 GHz WLAN. With the presence of small size and good filtering performances, the proposed filtering antenna is a good candidate for the wireless communication systems. Prototypes of the proposed filtering antenna incorporating a PIN diode are fabricated and measured. The measured results including return losses and radiation patterns are presented.
Highlights
The wireless local area network (WLAN) has experienced a rapid growth in the last decade, which has been widely employed in wireless applications such as WIFI, Bluetooth, and GPS
Type of the PIN diode is selected as Philips BAP64-03, while the DC bias current is supplied by two AAA batteries
The measured results show that the presented filtering antenna provides good selectivity and out-of-band rejection
Summary
The wireless local area network (WLAN) has experienced a rapid growth in the last decade, which has been widely employed in wireless applications such as WIFI, Bluetooth, and GPS. Several efforts have been proposed in the literature [1,2,3,4,5,6,7,8,9,10,11,12,13] to integrate the antenna and the filter into a single module, and the sizes as well as operating bands are summarized in Table 1 [1,2,3,4,5,6,7,8]. The synthesis technique has been comprehensively studied in [2, 8], which is proved to be feasible by the example of an integrated 2.45 GHz third-order filtering antenna with good band-edge selectivity and design accuracy. Most of the referred filtering antennas are for single-band applications, which can hardly meet the demands of the current dual-band 802.11 a/b/g WLAN applications
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