Design and development of a broadband amplitude compensated long time delay circuit on thin‐film liquid crystal polymer

Abstract

and the effect of the finite ground which has not been included in the simulation procedure. The passband insertion loss is about 2.4 dB, which is mainly due to the conductor and dielectric losses of the substrate. The 3-dB bandwidth is 5.3%. Two transmission zeros at 0.97 GHz and 1.04 GHz are observed as expected. The out-of-band rejection is better than 31.5 dB at the lower stopband and 29 dB at the upper stopband. CONCLUSIONIn this article, a novel compact slow-wave open-loop resonator has been presented to build up fourth-order cross-coupled microstrip bandpass filter. Both theory and experiments are provided. The results demonstrate that the filter size can be extremely reduced by using the proposed resonator. The measured results are in good agreement with simulated predictions. In fact, besides the filter mentioned above, the compact slow-wave resonators can also allow various filter topologies to be realized. Using the proposed approach, it is possible to achieve a very compact arrangement and reduce the space needed for the integration of the filters in future wireless communication systems. ACKNOWLEDGMENTSThis present work was supported by Science and Technology Foundation for Youth of University of Electronic Science and Technology of China, JX0620. DESIGN AND DEVELOPMENT OF

Flexible Liquid Crystal Polymer Technologies from Microwave to Terahertz Frequencies

“…Ta et al reported a compact broadband balun in 2013 [65] (see Figure 4e) and Pham et al reported a UWB low-loss balun with stacked-defected grounding in 2018 [67], both of which are preferable for antenna design. A long-time-delay circuit with a broad bandwidth was reported in [68], whose 2-bit relative delay reached up to 600 ps. Chieh and Pham developed a flexible Wilkinson power divider with integrated thin-film resistors, achieving a wide bandwidth ratio of 9:1 within a compact size [69].…”