Small size tuneable printed F‐slot antenna for mobile handset applications

Abstract

In this article, a compact tuneable F‐slot monopole antenna for mobile handset applications, covering the DCS, PCS, and UMTS frequency bands, is presented and studied. An F‐shaped slot is embedded in a rectangular monopole patch to accommodate the varactor. The tuning is accomplished by applying a lumped capacitor (varactor) across the slot arms of the patch. By varying the capacitance values of loaded capacitor from 0.5 to 3 pF, the antenna is capable of achieving high tuning ranges from 1.70 to 2.15 GHz. The antenna performance is characterized in terms of the reflection coefficient, radiation pattern, and power gain. The predicted and measured results show fairly good agreement and confirm satisfactory impedance bandwidth characteristics and consistent radiation patterns over the tuned frequency range. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:794–802, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26649

Compact and closely spaced tunable printed F‐slot multiple‐input–multiple‐output antenna system for portable wireless applications with efficient diversity

“…The preferred dimensions for antenna along with the I-shaped branch were obtained with the aid of the commercial simulator HFSS [36]. The cut-away ground structure is used to improve the impedance matching of the antenna as previously proposed by the authors in [34][35]. The mutual coupling between the proposed closely spaced antennas mainly comes from the induced current due to the sharing of the common ground and near field coupling.…”

“…Thus, in this paper, a MIMO antenna with two tunable closely spaced monopole antennas is proposed. The antenna system discussed in this paper is based on the tuned structure proposed by the authors in [34][35]. The design presented here is essentially a feasibility study for a compact printed MIMO antenna system suitable for mobile tracking and wireless sensor applications, and with an acceptable mutual coupling (below −13 dB).…”

“…1(a)). There are only a few areas where the antennas can be positioned under restrictions imposed by mobile phone manufacturers and this is usually on the top edge of the PCB [35]. Considering this constraint, we simulated and realized several two monopole configurations located in close proximity to each other.…”

Reconfigurable Microstrip Printed Patch Antenna for Future Cognitive Radio Applications

“…The proposed unloaded antennas (with and without slot) have demonstrated several advantages over previous works in [5][6][7][8][9][10][11][12][13][14][15], for example it has a smaller size compared to work in [ 5,6,8,9,10], and also shows a better gain in contrast to previous work in [5,7,9,10,15]. On the other hand, the proposed tunable design (third version), achieves a wider continuous tuned frequency range compared to works [18][19][20][21][22][23]; in addition, this version provides a degree of miniaturization compared to works in [ 18,19,20,22]. In all, there is a clear need for a cost-effective and reconfigurable antenna design based on mircrostip technology that is able to communicate with legacy (GPS, GSM, UMTS, LTE) and shows promising adaptability towards 5G (sub 6GHz), enabled by CR technology.…”

“…Several tunable printed antennas have been reported [18][19][20][21][22][23]. These antennas were tuned by using two different technologies either by varactor as in [18][19][20][21] or/and PIN diode switching as in [22][23].…”