A reconfigurable mobile antenna for multiband operation using PIN‐diode

Abstract

This article proposes a mobile embedded antenna having tunable capacitance, and the validity of the proposed solution has been proven through its design, fabrication, and measurement. The antenna can be applied to long-term evolution (LTE) and DCS/PCS/wideband code division multiple access bands that are currently being used. The 4G mobile service requires antennas to expand its bandwidth so that it can include the LTE band and other service bands. However, it is difficult to obtain the low-band frequency due to the limited space for antennas in terminals. The proposed antenna with a PIN-diode was added to a basic planar inverted-F antenna structure to satisfy the intended bandwidth through the ON/OFF characteristics of the PIN-diode. To meet this requirement, a PIN-diode (MA4P274-1279T) manufactured by MACOM, was used to make the operation frequency of the low-band tunable. The antenna was fabricated and then measured using the optimized parameters, and the results have been compared with the simulated results. The antenna satisfied the requirements for operation frequency and performance for both low-band and high-band frequencies. The measured performance of the antenna fabricated with the optimized parameters was analyzed and compared with the simulation results.

Small‐size reconfigurable antenna for WWAN/LTE/GNSS smartphone applications

“…Ref. [9] GSM850/900/GSM1800/1900/UMTS2100 LTE700/GSM1800/1900/UMTS2100 6 20 × 5 × 62 (6200 mm 3 ) 3D…”

“…Further, with the reduced size of the antenna, the Q value will be larger, and the bandwidth will become narrower. Therefore, to better solve the conflict between miniaturisation and multi-band, researchers have proposed a variety of techniques, such as coupled-fed technology [1][2][3][4], reconfigurable technology [5][6][7][8][9][10][11][12] and resonant loop technology [13][14][15] and so on.…”

“…In the case of limited space, reconfigurable technology is one of the effective methods to realise the miniaturisation and multi-band because the reconfigurable antenna can obtain a wider bandwidth with unchanged size by only switching the operating mode of the single antenna [5][6][7][8][9][10][11][12]. Commonly, the reconfigurable way of controlling antenna current path is achieved by PIN diodes [5][6][7][8][9][10], varactors [10] and MEMS switches [11,12], so as to achieve the purpose of changing the antenna's resonant frequency to cover 2G/3G/4G bands ultimately. At the same time, the global navigation satellite systems (GNSS) have become the essential part for smartphone application.…”

A Compact Nine-Band Frequency Reconfigurable Antenna for Lte/Wwan/Wlan Handset Applications

“…Compared to the reference antennas [5][6][7] which have the same operation bandwidths, the proposed antenna has the advantage of smaller size. Compared with those reference antennas in [8][9][10] which have approximate volume, the proposed antenna has wider operating bandwidths and more suitable for LTE/WWAN/WLAN handset applications in the near future. Table 1.…”

Design of a compact reconfigurable antenna with triple band switchable characteristics

“…The single continuous loop element was given with three connections to feed point and two shorting points and operated in PIFA and loop modes for reconfigurable purpose in [6]. Tunable capacitance method is applied for getting switchable response among mobile communication bands in [7] and a cross shaped sleeve arm and the modified feed structure for a miniaturized microstrip square slot is proposed in [8]. The S-shaped radiating structure is divided into several isolated strips which are then connected through the switching elements can be seen in [9], which is intended to obtain reconfigurability.…”