In this work, a novel triband antenna is developed for wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), and Bluetooth application. The proposed antenna is printed on a low-cost FR-4 substrate and has an overall size of 25 mm × 40 mm × 1.6 mm. Coplanar waveguide (CPW) line with characteristic impedance of 50 Ω is used as feed for the designed antenna. A prototype of this antenna is fabricated and tested to validate the simulation results. The measured result shows that the antenna has the triple-band response with frequency bands that correspond to S₁₁<−10 dB 2.36 − 3.17, 3.8 − 4.35, and 5.69 − 6.02 GHz. The measured gains of the antenna at resonant frequencies of 2.61, 4.115 and 5.85 GHz are 0.756, 0.925 and 1.589 dBi, respectively. Maximum decrement in measured gain is only 0.671 dB which is attributed to losses from connectors and cables. A novel approach, based on a combination of a cap-shaped ground plane and gap coupling technique in the form of an interdigital capacitor (IDC), is used to achieve the characteristic of triple frequency bands. Finally, the utility of the proposed antenna is checked with a four-element MIMO antenna.

在这项工作中，开发了一种新型三频天线，用于无线局域网（WLAN）、全球微波接入互操作性（WiMAX）和蓝牙应用。所提出的天线印刷在低成本的FR-4基板上，整体尺寸为25毫米×40毫米×1.6毫米。使用特性阻抗为 50 Ω 的共面波导 (CPW) 线作为设计天线的馈源。制造并测试了该天线的原型以验证仿真结果。测量结果表明，该天线具有三频响应，其频段对应于S ₁₁<−10 dB 2.36 - 3.17、3.8 - 4.35 和 5.69 - 6.02 GHz。在2.61、4.115和5.85 GHz谐振频率下测得的天线增益分别为0.756、0.925和1.589 dBi。测量增益的最大衰减仅为 0.671 dB，这是由于连接器和电缆的损耗造成的。采用一种基于帽形接地层和叉指电容器 (IDC) 形式的间隙耦合技术相结合的新颖方法来实现三频段的特性。最后，使用四元件 MIMO 天线检查所提出天线的实用性。