ABSTRACT

A (1 × 2) filtenna array inspired by an inter-digital-based bandpass filter is presented in this paper for simultaneous radiation and filtration. The feed line of the proposed antenna array resonating at 14 GHz with fractional bandwidth of 5.72% is modified in such a way that it acts like an inter-digital-based bandpass filter. The equivalent lumped circuit model of the proposed structure is analysed and detail synthesis procedure is presented. To study the impact of dimensional variations on the performance of proposed filtenna array, various parametric studies of filtenna and corresponding antenna array are performed and compared. The design strategy involves (N-1) filter circuits for realising a (1 × N) element filtenna array. The proposed array exhibits advantageous features such as low circuit complexity, compact size and low operational power over other reported filtenna arrays. The presented filtenna possesses fractional bandwidth and peak gain of 3.85% and 8.14 dB respectively at resonating frequency of 14 GHz, which covers the standards of Ku-band. The physical size of the filtenna array in terms of free space wave length is 1.96λ₀ × 1.96λ₀ × 0.073λ₀ at 14 GHz. The radiation patterns are omni-directional in E-plane and nearly omni-directional in nature at H-plane at resonance frequency of 14 GHz.

摘要

本文提出了一种 (1 × 2) 滤波器阵列，其灵感来自基于叉指的带通滤波器，用于同时辐射和过滤。建议的天线阵列的馈线以 14 GHz 谐振，分数带宽为 5.72%，经过修改，使其类似于基于叉指的带通滤波器。分析了所提出结构的等效集总电路模型，并给出了详细的综合过程。为了研究尺寸变化对提出的 filtenna 阵列性能的影响，对 filtenna 和相应的天线阵列进行了各种参数研究并进行了比较。设计策略涉及 ( N -1) 个滤波器电路，用于实现 (1 ×  N) 元素 filtenna 阵列。与其他报道的 filtenna 阵列相比，所提出的阵列表现出诸如低电路复杂性、紧凑尺寸和低工作功率等优点。所提出的滤波器在14 GHz的谐振频率下分别具有3.85%和8.14 dB的分数带宽和峰值增益，覆盖了Ku波段的标准。在自由空间波长方面，filtenna 阵列的物理尺寸在 14 GHz 时为 1.96λ ₀  × 1.96λ ₀  × 0.073λ _{0 。}辐射方向图在 E 平面是全向的，而在 H 平面在 14 GHz 谐振频率下几乎是全向的。