A Millimeter-wave High Selective Lowpass Filter in Suspended Stripline Technology

Miri, Seyyed Milad; Mohammadpour‐Aghdam, Karim; Miri, Seyyed Omidreza

doi:10.1109/mmwatt.2018.8661231

Cited by 3 publications

(7 citation statements)

References 15 publications

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“…Authors recently published a paper [12] and completely described the design method of single low-pass filter using the 13 th -order generalized Chebyshev prototype in SSL technology. Also, simulation and measurement results of single low-pass filter have been presented in Ref.…”

Section: Low-pass Filter Designmentioning

confidence: 99%

“…However, waveguide diplexers have low loss and high isolation between channels, but they are massive and relatively expensive; consequently, they are not suitable for integrated circuits [10,11]. The suspended stripline (SSL), which has a substrate suspended symmetrically between two ground planes, has some attractive features including lower loss over wider frequency range of operation, flat group delay, and better temperature stability compared with microstrip and stripline [12]. Thickness of dielectric layer is much smaller than cavity height resulting in an effective dielectric constant near to one.…”

Section: Introductionmentioning

confidence: 99%

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A Wideband, Sharp Roll-Off U-Band Diplexer in Suspended Stripline Technology

Miri

Mohammadpour‐Aghdam

Miri

2023

International Journal of RF and Microwave Computer-Aided Engine

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This paper presents a low-loss, sharp roll-off, and wideband millimeter-wave contiguous diplexer implemented on 0.127 mm-thick TLY5 dielectric material to separate U-band frequency range into two jointed frequency ranges of 40-50 GHz and 50-60 GHz using two low-pass and high-pass filter channels. In order to integrate the diplexer in the front end of a wideband millimeter-wave down-converter and evaluate the frequency response, the proposed diplexer is supported by three add-on waveguide-to-suspended-stripline transitions. The final design of diplexer consisting of a low-pass filter with cut-off frequency of 50 GHz, a pseudo-high-pass filter with crossover at 50 GHz, and a T-junction is analyzed and optimized together with a 3D full-wave simulator. The realized diplexer features a VSWR of 2.5 : 1 across the entire operation frequency band of 40-60 GHz, low passband insertion loss of less than 2 dB in both channels, stopband rejection higher than 45 dB, and compact size with dimensions of 27 × 13 mm2 due to its intelligent and guided design and technology selection.

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Section: Low-pass Filter Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Wideband, Sharp Roll-Off U-Band Diplexer in Suspended Stripline Technology

Miri

Mohammadpour‐Aghdam

Miri

2023

International Journal of RF and Microwave Computer-Aided Engine

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“…Authors recently published a paper and completely described the design method of single low‐pass filter using 13th order generalized Chebyshev prototype in SSL technology. Also, simulation and measurement results of single low‐pass filter have been presented in Reference .…”

Section: Design and Simulationmentioning

confidence: 99%

“…The length of each resonator is ideally half wavelength at the center frequency of passband, but because of different values for even and odd mode effective dielectric constants, the exact length of resonators can be determined as equations developed in Reference . By setting the internal impedance levels to have resonators with desired Q factor, the width of coupled lines is calculated using equations in Reference with respect to channel dimensions.…”

Section: Design and Simulationmentioning

confidence: 99%

“…However, waveguide diplexers have low loss and high isolation between channels, but they are massive and relatively expensive, consequently they are not suitable for integrated circuits . The suspended stripline (SSL), which has a substrate suspended symmetrically between two ground planes, has some attractive features including lower loss over wider frequency range of operation, flat group delay, and better temperature stability compared with microstrip and stripline . Thickness of dielectric layer is much smaller than cavity height resulting in an effective dielectric constant near to one.…”

Section: Introductionmentioning

confidence: 99%

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A wideband, sharp roll‐off U‐band diplexer in suspended stripline technology

Miri

Mohammadpour‐Aghdam

Miri

2019

Int J RF Mic Comp-Aid Eng

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This article presents a low‐loss, sharp roll‐off, and wideband millimeter‐wave contiguous diplexer implemented on 0.127‐mm‐thick TLY5 dielectric material to separate U‐band frequency range into two jointed frequency ranges of 40‐50 and 50‐60 GHz using two low‐pass and high‐pass filter channels. In order to integrate the diplexer in front end of a wideband millimeter‐wave down‐converter and evaluate the frequency response, the proposed diplexer is supported by three add‐on waveguide to suspended stripline transitions. The final design of diplexer consisting of a low‐pass filter with a cutoff frequency of 50 GHz, a pseudo‐high‐pass filter with crossover at 50 GHz, and a T‐junction is analyzed and optimized together with a three‐dimensional full‐wave simulator. The realized diplexer features a voltage standing wave ratio of 2.5:1 across the entire operation frequency band of 40‐60 GHz, low passband insertion loss of less than 2 dB in both channels, stopband rejection higher than 45 dB, and compact size with dimensions of 27 × 13 mm2 due to its intelligent and guided design and technology selection.

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