Integrated Mode Composite Transmission Line

Abstract

In this paper, a novel integrated mode composite transmission line (IMCTL) is proposed, which consists of inner and outer transmission lines. The proposed IMCTL takes full advantages of both substrate integrated waveguide (SIW) and spoof surface Plasmon polaritons (SSPPs) transmission line and supports high-frequency transmission in the inner transmission line and low-frequency transmission in the outer surface transmission line with different propagation modes. The dispersion characteristics of the inner and outer surface IMCTL are studied. The electromagnetic field (EM) distributions and propagation modes of the inner and outer surface IMCTL are examined. The circuit models of the inner and outer surface IMCTL are discussed and analyzed. In order to achieve the transmission of inner and outer surface IMCTL with different propagation modes, two simple high-efficiency conversion structures are utilized to convert the guided waves to the proposed IMCTL. The inner and outer surface IMCTL are designed and simulated, which show good transmission performance. The ohmic losses and dielectric losses of the inner and outer surface IMCTL are simulated and compared with typical transmission lines. The measured data of the proposed IMCTL show a very good agreement with the simulated results. The measured insertion losses of inner IMCTL are within 1.77 ± 0.64 dB from 5.5 to 10.0 GHz and the measured insertion losses of outer surface IMCTL are within 3.21 ± 1.22 dB from 2.0 to 6.0 GHz. The proposed IMCTL will play an important role in the integrated high-performance multiband microwave and wireless communication systems.INDEX TERMS Mode composite transmission line, spoof surface plasmon polaritons (SSPPs), substrate integrated waveguide (SIW), dispersion characteristics, circuit models, loss characteristics.

Dual-Band Large-Frequency Ratio Power Divider Using Mode Composite Transmission Line for 5G Communication Systems

“…Recently, there have been many studies that combine SSPPs and an SIW into a filter, since SIWs have high-frequency passing characteristics, and SSPPs have lowfrequency passing characteristics. However, all these structures [19][20][21] have SSPPs inside the SIW, and obtained only bandpass filters.…”

Independently controllable dual band filtering characteristics of a spoof surface plasmonic waveguide employing compound slot structure

“…However, these multiband filters are neither with wide upper-band suppressions nor capable of controlling the passband performance. In addition, hybrid structures, composed of substrate integrated waveguides (SIWs), or half-mode SIWs and the SSPPs structure, are employed for constructing dual band filters [38][39][40][41][42][43][44][45][46][47][48]. For example, periodic sub wavelength H-type cells are etched on the top surface of SIW to support SSPPs mode, and the resonant tunneling of H-type element has double band-pass characteristics [38].…”

“…For example, periodic sub wavelength H-type cells are etched on the top surface of SIW to support SSPPs mode, and the resonant tunneling of H-type element has double band-pass characteristics [38]. There are also dual-band filters synthesized based on integrated mode composite TL using SIW and SSPPs structure [43]. In the past few years, some singlelayer SSPP-TLs to the conventional planar lines [49,50].…”

A high‐performance mode multiplexer based on hybrid spoof surface plasmon polariton and substrate integrated waveguide

“…21 Since then, many works based on the SSPP-SIW have been proposed in the microwave or THz devices and circuits, such as hybrid SSPP-SIW bandpass filter, [22][23][24] slow-wave HMSIW filter, 25,26 SIW-SSPP leaky-wave antenna, [27][28][29] SIW-SLSP octuplet mode filter, 30 SIW-ESPP frequency splitter, 31 and integrated mode composite transmission line (IMCTL). 32 Among them, the IMCTL has attracted a lot of attention, because it provides a new possibility for improving the channel capacity of the communication system. However, the above researches mainly focus on the dual-band transmission of two modes in the hybrid TL, and the samefrequency dual-mode multiplexing by a single structure has not been realized yet.…”

“…Recently, a hybrid TL for SSPP and SIW has been proposed to realize the direct conversion between SSPP mode and SIW mode 21 . Since then, many works based on the SSPP‐SIW have been proposed in the microwave or THz devices and circuits, such as hybrid SSPP‐SIW bandpass filter, 22–24 slow‐wave HMSIW filter, 25,26 SIW‐SSPP leaky‐wave antenna, 27–29 SIW‐SLSP octuplet mode filter, 30 SIW‐ESPP frequency splitter, 31 and integrated mode composite transmission line (IMCTL) 32 . Among them, the IMCTL has attracted a lot of attention, because it provides a new possibility for improving the channel capacity of the communication system.…”