Abstract
This paper presents an alternative process to fabricate flexible bandpass filters by using an embroidered yarn conductor on an electronic textile. The novelty of the proposed miniaturized filter is its complete integration on the outfit, with benefits in terms of compressibility, stretchability, and high geometrical accuracy opening the way to develop textile filters for wearable applications in sport and medicine. The proposed design consists of a fully embroidered microstrip topology with a length equal to quarter wavelength (λ/4) to develop a bandpass filter frequency response. A drastic reduction in the size of the filter was achieved by taking advantage of a simplified architecture based on meandered-line stepped impedance resonator. The e-textile microstrip filter was designed, simulated, fabricated, and measured with experimental validation at a 7.58 GHz frequency. The insertion loss obtained by simulation of the filter was substantially small. The return loss was greater than 20 dB for bands. To explore the relations between the physical parameters and filter performance characteristics, a theoretical equivalent circuit model of the filter constituent components was studied. The bending effect of the e-textile filter was also studied. The results showed that by raising the radius of bending to 40 mm, the resonance frequency was raised to 4.25 MHz/mm.
Highlights
Microwave bandpass filters (BPF) are key building elements of communication systems
One type of miniaturized microstrip bandpass filter that uses a pseudo-interdigital structure without ground holes ground is proposed in [1] and a variety of resonator types have been introduced, including split-ring resonators [2] or stepped impedance resonators (SIR) [3] to achieve bandpass filter frequency responses
We present for the first time an e-textile microwave filter based on an embroidered meander microstrip line
Summary
Microwave bandpass filters (BPF) are key building elements of communication systems. They should meet several requirements, mainly system performance frequency response, reduced size, and manufacturing cost. It has become desirable to develop new types of microstrip bandpass filters with small size and planar fabrication. Parallel coupled microstrip bandpass filters are common elements in many microwave systems [1], due to their many advantages such as planar design, easy analysis, and low cost. One type of miniaturized microstrip bandpass filter that uses a pseudo-interdigital structure without ground holes ground is proposed in [1] and a variety of resonator types have been introduced, including split-ring resonators [2] or stepped impedance resonators (SIR) [3] to achieve bandpass filter frequency responses
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