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This letter presents a planar triple-band multiple- input-multiple-output (MIMO) antenna that meets GSM900/1800 and LTE2600 bands protocols. The antenna element contains three individual meander-line-type inverted-L radiators; the highest frequency band radiator is fed by a transmission line, while the other two utilize the proximity-coupling feeding mechanism driven by the highest band radiator. The MIMO antenna is incorporated with two symmetric triple-band antenna elements and two physical decoupling devices. The two antenna elements are closely spaced with 1/15 wavelength of the lowest band. The two decoupling devices, a T-shaped slot and a meandering microstrip-line resonator, are built for the highest and the lowest frequency bands, respectively. Meanwhile, a negligible mutual coupling effect in middle band is achieved by using a collinear-placed transverse meander-line pair in the MIMO antenna. The antenna prototype measurement results show good impedance matching with low mutual coupling effect. The calculated envelope correlation coefficient verifies the suitability of the proposed antenna for mobile wireless access applications.

This paper presents a compact dual-band MIMO antenna that is compatible to the IEEE 802.11n wireless LAN standards. The MIMO antenna contains two tree-type elements placed back to back with distance of one-sixth wavelength of 2.4GHz; the element in the MIMO antenna is structured with a two-branch tree-type planar inverted-L monopoles, the lengths in both branches are set to the electrical quarter-wavelength of the frequency bands of 5.2GHz and 2.4GHz respectively. The MIMO antenna characterized by small size, low mutual coupling effect and nearly omni-directional coverage in radiation pattern make it entirely applicable to the mobile wireless network applications. The measurement results of the fabricated MIMO antenna demonstrate the success of the suggested design topologies.

This paper presents a compact self-decoupling dual band MIMO antenna that meets wireless local area network communication standards. The self-decoupling is taken place by purposely using a folded loop-shape element in the MIMO antenna. Furthermore, the feeding point of the element antenna is deliberately selected so as to produce both the two desired frequency bands. The whole loop structure is constructed to produce the lower frequency band while a portion of the loop is resonant to the higher frequency band. The MIMO antenna contains two folded loop-shape elements situated back-to-back with a closed inter-element distance of one-tenth wavelength of the lower band. The novelty of this MIMO antenna is attributed to the achievement of good isolation without using any other supplementary decoupling mechanisms. In addition, the properties of small in size, simple in structure, nearly omni-directional in radiation pattern with moderate radiation gain make the proposed MIMO antenna fully compatible and fairly attractive to the wireless and internet network applications.

This paper presents a kind of CPW-fed Pentagon-type multi-band planar monopole antenna. It provides an integrated wideband operating frequency band coverage from 900MHz of GSM to 10.6GHz UWB applications. This is the desirable antenna characteristic that is suitable for modern integrated mobile broadband wireless radio access applications. The proposed antenna was fabricated in practice with the FR4 print circuit board having 1.6 mm substrate thickness and dielectric constant of 4.4, tangent loss constant of 0.02. The measurement results show the success of the proposed planar monopole antenna. The detailed antenna design parameters are given in this paper. The characteristics of this type antenna, wide in bandwidth, low in profile, light in weight and small in size and single layer fabrication can be beneficial in the future integration with other microwave circuit of wireless systems.

A compact multiband planar monopole antenna is presented in this paper. The operating frequency bands of the proposed antenna cover the multiple wireless access protocols of GSM (880-960MHz), DCS (1710-1880MHz), WiMAX (3.23.6GHz), WLAN and Bluetooth (2.4GHz), and WLAN (5.15.35GHz). The antenna is constructed by two distinct monopoles which are individually located at the opposite side of the substrate; a broadband meander-line monopole is structured to create the triple lower frequency bands, on the other hand, a tree-type monopole is built not only to produce the dual higher frequency bands, but also to act as a proximity-coupled feed for the meander-line resonator. The antenna together with several attractive characteristics, such as small in size, broad in operating frequency band and omni-directional in radiation pattern, makes itself particularly suitable to the integrated mobile wireless access applications. The measurement results demonstrate the success of the antenna design approach.

In order to obtain the full advantages of modern mobile MIMO wireless access communication, a compact and low mutual coupling antenna array is essential. Hence, this paper presents a compact dual band two element MIMO antenna operating in the 2.4GHz and 5.2GHz bands for mobile wireless LAN application. The dual-band antenna element is structured with a planar two-branch inverted-L tree-type monopole, where, the two collinear inverted-L radiators have been purposely organized such that a squeezed element radiation pattern is obtainable. The MIMO antenna is then incorporated with two tree-type monopoles and a simple narrow band isolator to achieve an excellent mutual coupling performance. Besides, the characteristics of small size and nearly omnidirectional coverage in array radiation pattern make the proposed MIMO antenna entirely compatible with the mobile wireless network applications. The measurement results of the fabricated antenna array demonstrate the success of the suggested design topology.

This paper presents a compact dual band two element MIMO array covering the 2.4GHz and 5.2GHz bands for the modern mobile wireless LAN applications. The dual band antenna element is structured as a two-branch tree-type inverted-L monopole, where, the two collinear inverted-L radiators have been purposely organized such that an oblique element radiation pattern is obtainable. The MIMO array is then incorporated with two tree-type monopoles and a simple narrow band isolator to achieve an excellent mutual coupling performance. Besides, the characteristics of small size and nearly omnidirectional array radiation pattern make the proposed MIMO array entirely compatible with the mobile wireless network applications. The measurement results of the prototype antenna array demonstrate the success of the suggested design topology.

This paper presents a kind of CPW-Fed Multi-Broadband Monopole Antenna, which provides an integrated operating bandwidth coverage from 900MHz of GSM, WLANs up to 10.6GHz of UWB. This is the antenna particularly desirable for modern integrated mobile broadband wireless radio access applications. The property of wide range in multiple broadband appeared in the proposed antenna has been created judiciously by using a folded-line loaded monopole with an edge-coupling mechanism. The measurement result shows the success of this novel design approach.

A cross-dipole antenna surrounded by four pins is used as a radiating element for a finite-element phased array. To achieve near-hemispherical radiation coverage and high gain under the consideration of mutual coupling effects, a method using genetic algorithms to optimize the design parameters of a cross-dipole antenna is presented. A method of moment code performs the task of evaluating each of the antenna designs generated by the genetic algorithm (GA) during the optimization process. To illustrate the capabilities of this approach, the numerical results are compared to the measured ones, showing excellent agreement in the comparison.