Micromachined filters on synthesized substrates

Drayton, R.F.; Pacheco, Sergio; Yook, J.-G.; Katechi, L.P.B.

doi:10.1109/mwsym.1998.700585

Cited by 11 publications

(3 citation statements)

References 9 publications

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“…Micromachining is also a popular approach utilized in [9,10] that extends the useful range of highand low-impedance values in microstrip on high dielectric-constant materials and helps in attaining a sharp rejection band edges.…”

Section: Introductionmentioning

confidence: 99%

“…The ratio of high impedance and low impedance (Z H /Z L ) lines should be kept as high as possible for better approximation of lumped element capacitor and inductor realization. In general, the Z H /Z L line for conventional stepped-impedance LPF is 5 (20 Ω : 100 Ω) [9]. It is chosen considering the issues of occurrence of transverse resonance at operating frequency due to width of low impedance line and fabrication limitations of high impedance line width.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and Development of Recessed Ground Microstrip Line Low Pass Filters

Jaiswal¹,

Abegaonkar²,

Koul³

2019

PIER Letters

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The design of conventional stepped-impedance microstrip line low pass filter (LPF) is based on high (Z H) to low impedance (Z L) ratio. The width of Z H line, for Z H > 100 Ω, becomes critical and challenging, especially on high dielectric constant substrates. A concept of air-filled recessed ground plane below a microstrip line is introduced in this paper. The effect of dimensions of recessed ground on characteristic impedance, attenuation, and propagation constant of a microstrip line are first studied. This simple approach is utilized to design the Z H line of stepped-impedance microstrip line LPFs. Prototypes of recessed ground stepped-impedance microstrip line LPFs with Z H /Z L (keeping Z L constant as 20 Ω) ratio in the range 6 to 10 are designed and developed on Rogers 4350B of height 0.508 mm with ε r = 3.66 at 3 GHz. For LPF with Z H /Z L = 10, the measured 3-dB cutoff frequency (f c) is achieved at 3.12 GHz with return loss (RL) > 12 dB and insertion loss (IL) < 0.28 dB in its passband whereas the stopband attenuation (SBA) is better than 38 dB. In comparison to recessed ground LPF, the simulated results of conventional LPF with Z H /Z L = 10 (critical width of Z H line =) are as follows RL > 10 dB and IL < 1.07 dB in passband at f c = 3 GHz. The size of recessed ground LPF is reduced by 25%, when Z H /Z L is increased to 10 from 6. The approach of recessed ground microstrip line avoids the fabrication issues, reduces size, and improves the performance of LPF, which in turns confirms the advantages of recessed ground over conventional microstrip line.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Development of Recessed Ground Microstrip Line Low Pass Filters

Jaiswal¹,

Abegaonkar²,

Koul³

2019

PIER Letters

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“…Over the pass few years, several research groups have demonstrated different kinds of micromachined filters with excellent performance [3][4][5][6][7]. IEMS filters with substantial loss reduction were achieved by partially removing substrates [3] or fabricating the entire filter on suspended thin dielectric films [4].…”

Section: Introductionmentioning

confidence: 99%

Micromachined Millimeter-wave Ridge Waveguide Filter with Embedded MEMS Tuning Elements

Yan

Mansour

2006

2006 IEEE MTT-S International Microwave Symposium Digest

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This paper demonstrates the feasibility of constructing micromachined 3-dimensional ridge waveguide filters with built-in tuning elements. The objective of the tuning elements is to fine tune the filter in order to compensate for the fabrication tolerance of the micromachining process. A novel micromachined ridge waveguide filter with a coplanar line input/output interface is proposed. The structure is analyzed both theoretically and experimentally. A 2-pole micromachined millimeter-wave filter with embedded MEMS actuators as tuning elements is designed, fabricated and tested to demonstrate the concept. At 24 GHz, the filter size is only 2mm x 4mm.

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