Abstract
An efficient H-plane mutual coupling reduction method is introduced for very closely placed dual-element microstrip antennas operating at 2.4GHz. A simple coplanar waveguide (CPW) structure is introduced in the ground, energy from one element is guided to another element, artificially generating new kind of mutual coupling current. By optimizing size of CPW structure to achieve purpose that new mutual coupling current cancel out with original existing mutual coupling. More than 36dB isolation (|S21|) is achieved with dual-element broadside array that distance is less than 0.024 λ 0 ( λ 0 is free space wavelength).
Highlights
Reduction mutual coupling has currently attracted considerable attention, antenna performance can be improved if mutual coupling is suppressed, such as inner-antenna spacing reduction and channel-capacity increment in MIMO application, side-lobe level (SLL) control and direction of arrival (DOA) estimation
Near field coupling becomes dominant over surface wave coupling when space between antenna elements decreases
To Patch 2, it is that the conduction current and the displacement current offset each other
Summary
Coupling between antenna elements is mainly caused by surface waves and near field [1]-[3]. Near field coupling becomes dominant over surface wave coupling when space between antenna elements decreases. Various types of electromagnetic band-gap (EBG) have been proposed [4][7]. Because size of the cell structure of EBG is not so small, these methods are mainly applicable when substrate is thick, dielectric constant is relatively high and distance between antenna elements is not so close. Simple and efficient methods are proposed in [8] and [9], but both of them are E-plane mutual coupling reduction
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