Abstract
A compact flexible filter based on 0° feed structure with ultrathin liquid crystal polymer substrate is proposed firstly. An open-ended stub is introduced to improve the out-band rejection. The presented flexible filter with dimension of 6.48 × 9.89 × 0.086 mm3 is operating at WLAN of 5.15–5.875 GHz, which will alleviate the channel congestion of 2.4 GHz. In the case of flat, the measured minimum insertion loss is 1.9 dB at 5.61 GHz and the return loss is better than 16.45 dB. The bending behaviour of the compact flexible filter is also analysed. Compared with the flat case, the return loss is optimised by 0.45 dB, the maximum deterioration of insertion loss is 0.13 dB in case of R = 10 mm, and the transmission zeros position are invariant. Good agreement is obtained between the flat and the bending situation, which shows that the presented flexible filter is promising for the wearable applications.
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