Substrate Integrated Waveguide Multiband Bandpass Filters and Multiplexers: Current Status and Future Outlook

Zhou, Kang; Wu, Ke

doi:10.1109/jmw.2022.3227131

Cited by 13 publications

(5 citation statements)

References 168 publications

(292 reference statements)

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“…Although manifold-style multiplexers have been well defined in the literature ( [6], [7], [8], [9], [10], [11], [12]) for both star-and manifold-coupled designs, the vast majority of designs are contrived for tightly-spaced narrowband channel selection and utilize a manifold coupling scheme to allow for the additional degree of freedom provided between each contiguous filter branch. Work in this field has spanned all the way to the terahertz region and across many technology platforms (e.g., [13], [14], [15]. However, on the consideration of wideband channels, it is common to see configurations that utilize lowpass filter techniques to allow for a wide lowpass response while the upper-ranged filter response is provided by a single bandpass or highpass filter [16], [17], [18]; in this scheme, the device often becomes limited to operate as a diplexer due to the frequency region of interest being covered by the combination of lowpass/highpass responses.…”

Section: Introductionmentioning

confidence: 99%

Integrated Wideband Multiplexer Design for Multiple-Use SATCOM/Terrestrial Terminals

Bartlett,

Höft,

Rosenberg

2024

IEEE J. Microw.

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A novel wideband multiplexer is introduced as a communications equipment solution in order to provide simultaneous operation of satellite and terrestrial services in the dedicated K/Ka frequency bands (passbands ranging from 19.5 GHz to 30.5 GHz). Advanced RF filtering techniques are applied in order to accommodate a compact multiplexer design while maintaining low insertion loss and high rejection demands up to 33 GHz. Due to the overall wide bandwidth and the demanding requirements for the assigned three operational bands, different filter types have been employed. Thus, the multiplexer considers the combination of filters with rectangular, evanescent combline, and conductor-loaded resonator types. The multiplexer relies on the direct branching approach, i.e., all filters are connected to a central (star-junction) waveguide branching region. This region exhibits a reduced waveguide size to suppress interference by higher order modes. For a verification of the approach, WR34 waveguide interfaces have been considered at all ports for prototype design, however, the design can be well adapted for integrated equipment solutions with associated direct interfaces. Accurate coincidence of analyzed and measured performance of the prototype demonstrates the validity of the special approach. Moreover, additional simulations are provided as an outline for terminals with specific industry demands.

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Section: Introductionmentioning

confidence: 99%

Integrated Wideband Multiplexer Design for Multiple-Use SATCOM/Terrestrial Terminals

Bartlett,

Höft,

Rosenberg

2024

IEEE J. Microw.

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“…Multiband communication systems have gathered much interest in recent times as a means to fulfil the increasing demands of high data rates, low latency, and low power consumption in 5G/6G networks as well as military radar systems, satellite communications and electronic warfare [1,2]. The system architecture and the component designs for such multiband systems differ significantly compared to the conventional single-band systems.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Multiband Microwave Filters using Programmable Photonic Integrated Circuit

Velamuri,

PIYUSH,

Raj

et al. 2024

Preprint

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A programmable square mesh architecture of photonic integrated circuit comprised of 14 tunable balanced Mach-Zehnder interferometers has been investigated using silicon photonics technology platform for the demonstration of reconfigurable multiband microwave photonic filters. The photonic chip was electrically packaged for its reconfigurable operations using external16-channel programmable power supply for tuning the thermo-optic phase-shifters integrated in both the arms of Mach-Zehnder interferometers. The operating temperature of the packaged chip is stabilized within ±0.002º𝐶 using a PID controller, to avoid any interference of ambiance temperature fluctuations. The mesh architecture is programmable into three different microring resonators in all-pass configurations operating independently for three different free-spectral ranges (23.25 GHz, 11.75 GHz, 8.75 GHz), respectively. The multiband microwave photonic filter characteristics have been experimentally obtained using fiber-coupled off-chip laser source (operating at 𝜆 ∼ 1550 nm), modulator (bandwidth ∼ 40 GHz) and photodetector (bandwidth ∼50 GHz). Thus we have demonstrated microwave filters with two, three and four bands within the bandwidth of the modulator used in the experiments. Among these, the two-band filter realized for X and Ka-band was thoroughly investigated in the experiments to understand the effect of the MRR coupling condition (Q-factor) on the realized filter bandwidth and its tuning range, link gain and rejection. The bandwidth of both the filter bands was tuned over the extensive range of 1.6 GHz to 12.7 GHz by controlling the MRR Q-factor and the resonance spacing from the28 carrier. At the same time, the bandwidth tuning range of the three-band filter realized for C, Ku, and Ka-band (2 GHz to 6 GHz) and four-band filter realized for C, Ku, K and Ka-band (3 GHz to 5 GHz) in our experiments were limited by the MRR’s resonance bandwidth and free spectral range.

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“…However, because the size of an SIW is on the order of the guided wavelength λ SIW in the SIW, SIWs are usually implemented at the board level as interconnects and transitions [6], filters [7], [8], antennas [9], or power combiners [10] for hybrid integration with transistors.…”

Section: Introductionmentioning

confidence: 99%

A D-Band Frequency-Doubling Traveling-Wave Amplifier Through Monolithic Integration of a SiC SIW and GaN HEMTs

Li,

Fay,

Hwang

2024

IEEE J. Microw.

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We report a solid-state traveling-wave amplifier (TWA) realized through monolithic integration of transistors with a SiC substrate-integrated waveguide (SIW). The TWA uses a stepped-impedance microstrip line as the input divider, but a low-loss, high-power-capacity SIW as the output combiner. The input signal is distributed to four GaN high-electron mobility transistors (HEMTs) evenly in magnitude but with 90°successive phase delays at the fundamental frequency. The HEMTs are distributed in the SIW in a period of a half wavelength at the second harmonic frequency, so that their outputs are combined coherently at the SIW output. To overcome the limited speed of the HEMTs, they are driven nonlinearly to generate second harmonics, and their fundamental outputs are suppressed with the SIW acting as a high-pass filter. The measured characteristics of the TWA agree with that simulated at the small-signal level, but exceeds that simulated at the large-signal level. For example, under an input of 15 dBm at 70 GHz, the output at 140 GHz is 38-dB above that at 70 GHz. Under an input around 70 GHz and 20 dBm, the output around 140 GHz is 14 dBm with a 3-dB bandwidth of 6%. This is not only the first D-band frequency multiplier based on the GaN HEMT technology, but also one with the highest output power and the lowest fundamental leakage among all D-band multipliers of different transistor technologies. This proof-of-principle demonstration opens the path to improve the power, gain and efficiency of sub-terahertz TWAs with higher-performance transistors and drive circuits. Although the demonstration is through monolithic integration, the approach is applicable to heterogeneous integration with the SIW and transistors fabricated on separate chips.

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Substrate Integrated Waveguide Multiband Bandpass Filters and Multiplexers: Current Status and Future Outlook

Cited by 13 publications

References 168 publications

Integrated Wideband Multiplexer Design for Multiple-Use SATCOM/Terrestrial Terminals

Integrated Wideband Multiplexer Design for Multiple-Use SATCOM/Terrestrial Terminals

Reconfigurable Multiband Microwave Filters using Programmable Photonic Integrated Circuit

A D-Band Frequency-Doubling Traveling-Wave Amplifier Through Monolithic Integration of a SiC SIW and GaN HEMTs

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