Loss mechanism of the SISL and the experimental verifications

et al. 2021

Self Cite

This letter presents two compact filters using patch resonators based on the substrate integrated suspended line (SISL) technology platform. First, a bandpass filter (BPF) with multiple coupling schemes is designed by using a shorted-stub-loaded patch resonator. Two shorted stepped-impedance resonators are working together to form the third-order BPF. A 98.18% size reduction is achieved, and five transmission zeros (TZs) are produced by introduced mixed electric and magnetic coupling, cross-coupling, and source to load coupling. Then, the SISL dual-band bandpass filter (DBBPF) with six TZs is designed by using an improved slotted patch resonator. By adopting the patterned suspended substrate structure, the implemented DBBPF, featured with self-packaging, achieves a fractional bandwidth of 52% and 10%, centered at 0.95 and 3.25 GHz with insertion losses of 0.57 and 2.89 dB, respectively.

Section: Discussionsupporting

confidence: 69%

Design of novel compact SISL filters with multiple TZs based on patch resonators

Wei

et al. 2021

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“…The loss of SISL in three cases is simulated in Wang and Ma. 14 However, the three cases have different impedance due to maintaining the same linewidth, and the contribution of dielectric loss and conductor loss has not been individually analyzed.…”

Section: Design Of Sisl Transitionmentioning

confidence: 99%

An FR4‐based dc to 60 GHz substrate integrated suspended line to suspended coplanar waveguide transition

et al. 2021

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An FR4-based dc to 60 GHz transition from substrate integrated suspended line (SISL) to suspended coplanar waveguide (SCPW) is proposed in this letter. The design is fabricated using standard multilayer printed circuit boards (PCB) technology, and the substrates used are all low-cost FR4. Since the whole structure is in the suspended form, the bandwidth of the transition has been expanded three times when compared with the state of art. By using SISL with double-metal layer and patterned substrate, the loss of the transition is further reduced, and the conductor loss and dielectric loss have been individually analyzed. The results show that the proposed backto-back transition has an insertion loss of less than 2.7 dB and a return loss of better than 11.4 dB from dc to 60 GHz.

“…Substrate integrated suspended line (SISL) [13][14][15][16] circuits feature low loss using FR4 substrates because almost all the electromagnetic (EM) field is distributed in the lossless air rather than the lossy substrates. 12,13 Using FR4 substrate to design high-frequency circuits will have great advantages in terms of cost, especially in mass production.…”

Section: Introductionmentioning

confidence: 99%

“…FR4 substrate is widely used in board‐level circuits because of its low price, high mechanical stability and good insulation performance, 12 but it is difficult to be used in high‐frequency circuits due to its high loss tangent. Substrate integrated suspended line (SISL) 13‐16 circuits feature low loss using FR4 substrates because almost all the electromagnetic (EM) field is distributed in the lossless air rather than the lossy substrates 12,13 . Using FR4 substrate to design high‐frequency circuits will have great advantages in terms of cost, especially in mass production.…”

Section: Introductionmentioning

confidence: 99%

A W‐Band Broadband Self‐Packaged Compact SISL Tripler using FR4 substrate

Zhang

et al. 2022

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A W‐band low‐cost and high output power tripler based on a substrate integrated suspended line (SISL) platform is presented in this paper. An accurate three‐dimensional electromagnetic model is established to characterize the high‐frequency parasitic effect of diodes, and the field‐circuit cosimulation method is employed to design the tripler. A SISL‐WR10 transition is designed and added in the output port to facilitate the test, and it also functions as a W‐band bandpass filter (BPF) to output the third harmonic, which avoids insertion loss caused by an additional BPF and makes the tripler more compact. The whole circuit of the tripler is fabricated on FR4 substrates, and it is self packaged. The measured results show that with 22 dBm input power, the tripler achieves 0–4.46 dBm output power from 75 to 106 GHz.