Analysis of a loop type ground radiation antenna based on equivalent circuit model

Abstract

A loop type ground radiation antenna has been analysed using an equivalent circuit model in this study. The proposed circuit model has been selected in such a way that the design parameters of the ground radiation antenna can be mapped onto the circuit. To demonstrate the accuracy of the model, a specific ground radiation antenna is designed in a full wave electromagnetic simulator and the equivalent circuit model of the antenna is optimised in a circuit simulator. The simulation results of the circuit simulator and full wave simulator are compared. Expressions of return loss and input impedance of the equivalent model have also been obtained. The proposed circuit model can be used to develop insight and describe the behaviour of the network parameters of the antenna.

A Compact and Straightforward Self-Decoupled MIMO Antenna System for 5G Applications

“…The resonance capacitor Cr not only can dramatically miniaturize the antenna area but also can control the antenna's resonance without modifying the antenna's dimensions. In this way, a miniature loop-type resonator can be formed around the clearance, operating as a magnetic coupling element to the ground plane for radiation [24][25][26][27][28][29][30]. As can be observed, the two ends of the loop antenna are symmetrically installed on the two sides of the open end of the ground-radiation antenna, establishing the proposed self-decoupled 2 × 2 MIMO antenna set without any additional decoupling structures.…”

“…Furthermore, ground-radiation antennas [24][25][26][27][28][29][30] are reported as small loop-type resonators, occupying ultrasmall ground clearance, and exciting the conducting body for radiation. Although they have been widely applied in terminal devices, such as laptops, smartphones, Internet of Things (IoT) devices, their MIMO applications are not compact at all [27,30] so that they are not suitable in 5G MIMO scenarios.…”

Circularly Polarized Loop-Type Ground Radiation Antenna for IoT Applications

“…The antenna's impedance level can be enhanced by increasing the clearance area of the antenna and using a lower value of C r . The impedance matching can be controlled by the feeding loop that contains C f [18]. The impedance level of the feeding loop (L f /C f ) 1/2 must be 50 Ω to match with the RF source.…”

A wideband loop‐type ground radiation antenna using ground mode tuning and optimum impedance level

“…A wideband slot‐type GradiAnt was proposed by Moon and Kim, where slot and ground sizes were optimized to match the operating frequency and the resonance frequencies of the ground mode to achieve 780 MHz bandwidth. GradiAnt for USB dongle was analyzed using equivalent circuit model . Using the analysis, 520 MHz bandwidth was reported.…”

“…GradiAnt for USB dongle was analyzed using equivalent circuit model. 17 Using the analysis, 520 MHz bandwidth was reported. Higher coupling between the antenna and the ground mode results in wider bandwidth.…”