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Layout of the proposed diversity/MIMO antenna on the upper part of mobile phone PCB; all dimensions are in mm.
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Fast development of next-generation wireless systems is driving further evolution of mobile phone antennas. This paper presents new design approach for reducing the mutual coupling and signal correlation of compact diversity/MIMO handset antenna elements by modifying the PCB ground plane. Parametric study to minimize the ports mutual coupling as we...
Context in source publication
Context 1
... layout of the proposed diversity antenna is shown in Fig. 1. In this work, the main effort has been an approach to minimize the mutual coupling and signal correlation between two closely spaced compact mobile phone antennas so that the design of antenna element is quite simple and straightforward. A pair of meander-type monopoles is printed on 1 mm-thick FR4 dielectric substrate (eps=4.2, ...
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Citations
... The design methodology of utilizing two or more antennas in the same handset can be generally divided into two directions. The first is the approach in which two antenna elements are operating at the same frequency bands, as in the MIMO and diversity antenna designs, and combining schemes are applied to increase the wireless channel capacity and to reduce the signal interference [1][2][3]. In the second one, the handset antennas are designed to operate at different frequencies for the wireless communication services that use incompatible modulation standards and, therefore, require different RF receive/transmit circuitry integrated into a mobile handset. ...
... Mutual coupling between antenna ports is of utmost importance in a multi-antenna system for handset applications. Usually, decoupling network or ground plane modification is required to minimize the mutual coupling of closely spaced antennas [3,4]. In this design, parametric study for the varying distance between antenna ports has shown that mutual coupling decreases to the -10dB level when ports' distance becomes 20mm or more. ...
This paper presents the modeling and design of 2-element compact ceramic chip antenna for UMTS/GPS dual-band mobile handset applications. First, the design of ceramic chip monopole integrated with a simple matching circuit will be explained. The radiation characteristics including high gain and total efficiency of the proposed compact antenna element will be presented. Next, 2-element antenna system for dual-band handset design where one antenna element is used for UMTS operation while the another one works as an assisted GPS (A-GPS) antenna will be introduced. Parametric study illustrating the effect of antenna elements separation on the mutual coupling between antenna ports will be analyzed. It has been shown that low mutual coupling is the result of strong current being induced on the 3D monopole placed inside high density dielectric ceramic pad. Mobile handset applications of the proposed compact 2-element antenna system will be discussed in the details at the Conference.
... To isolate the IFA ports, lo/4 slots (lo ≏ 34.6cm) are etched in the half-length of the ground plane [4]. Slots modify the current flow on the ground plane and confine it around the slots boundaries [5, 6] . The structure is simulated using the commercial electromagnetic solver High Frequency Structure Simulator (HFSS). ...
A diversity antenna combining four inverted-F antennas (IFAs) is evaluated for UHF RF identification (RFID) readers. Polarisation and pattern diversities are obtained for a sequentially rotated configuration of the IFAs. Mutual coupling between ports is minimised by etching quarter-wavelength slots into the ground plane. The resulting envelope correlation coefficient is less than 0.003 in the working band. A switching diversity scheme is then applied to evaluate the tags readability in a lab environment. It is shown that the antenna diversity enhances the reading range compared to a circularly or a linearly polarised antenna of the same size.
In this paper, the design of a planar polarization diversity antenna with low mutual coupling is presented. A current block element is inserted between a RF module and a feed element of an inverted-F antenna to block the current on the nonactivated antenna induced by mutual coupling, and an open stub is inserted to cancel reactance, which is induced by mutual coupling. The prototype of diversity antenna has been developed and measured. The measured result demonstrated the very low correlation coefficient of 0.02 and very low mutual coupling about -15 dB at 1 GHz in this work.
In this paper, a planar polarization diversity antenna with low correlation coefficient and low mutual coupling is developed for wireless sensor network system at UHF region. A slit, to eliminate mutual coupling between two antennas, inserted on ground plane of conventional diversity antenna is straight; this fact causes a restriction to layout of a PCB board at UHF region. To save a large area for the electric component, we employ an L-shaped slit which has an advantage of compact and same performance as straight slit. The prototype of diversity antenna has been developed and measured. The measured result obtained the very low correlation coefficient of 0.021 and very low mutual coupling about -20 dB at 1 GHz in this work.
