A compact coplanar stripline lowpass filter

Uysal, Sener; Ng, Jackson

doi:10.1109/apmc.1999.829812

Cited by 10 publications

(5 citation statements)

References 4 publications

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“…Traditional approaches (e.g., Butterworth, Chebyshev, and Elliptic) entail higherorder topologies to achieve a flat passband and sharp attenuation [6,7] and hence directly contradict the design requirements. A composite LPF can be promising in such challenging scenarios.…”

Section: Synthesis Of Composite Lpfmentioning

confidence: 99%

A compact realization of composite low-pass filter for monolithic microwave integrated circuit applications

Arbabi

Almalkawi

Devabhaktuni

et al. 2011

Int J RF and Microwave Comp Aid Eng

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A compact realization of composite low-pass filter is presented in this article. The filter is realized using on-chip spiral inductors and metal-insulator-metal capacitors and features an attenuation pole near the cutoff frequency leading to a sharper attenuation response. As well, it offers good matching properties in the passband. Space-mapping-based algorithm is used in the design/optimization of spiral inductors toward achieving high quality factors at the filter cutoff frequency. The realization of the proposed filter is compact in size, suitable for monolithic microwave integrated circuit applications, and exhibit broad upper stopband frequency characteristics.

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Section: Synthesis Of Composite Lpfmentioning

confidence: 99%

A compact realization of composite low-pass filter for monolithic microwave integrated circuit applications

Arbabi

Almalkawi

Devabhaktuni

et al. 2011

Int J RF and Microwave Comp Aid Eng

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show abstract

“…A lumped-element CPS low-pass filter was designed in 1998 [12], and a CPS low-pass filter using a transverse slit and a parallel-coupled gap of CPS discontinuities was presented in 1999 [13]. CPS discontinuities and their applications to bandstop filters were studied by using the spur-strip and the spur-slot resonators [14].…”

Section: B Cps Low-pass Filter Integrated With Bandstop Filtersmentioning

confidence: 99%

A high-efficiency dual-frequency rectenna for 2.45- and 5.8-GHz wireless power transmission

Suh

Chang

2002

IEEE Trans. Microwave Theory Techn.

336

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A novel compact wideband printed diversity antenna for mobile handsets is presented. The antenna comprises two back-to-back G-shaped monopoles placed symmetrically with respect to a T-shaped and dual inverted-L-shaped ground plane. The measured results show that the proposed diversity antenna operates in a very wide bandwidth of 420 MHz starting from 1890 to 2310 MHz covering the UMTS band (1920( -2170 with acceptable isolation. The antenna can provide pattern diversity to combat multipath fading.

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“…Benefiting from the proposed structure, a seventh-order Chebyshev stepped-impedance lowpass filter with a cutoff frequency of 5 GHz and a passband ripple of 0.5 dB has been designed and measured. In conventional CPS technology, such a design is impossible on a relatively thin and low-1 r substrate [4,5] owing to the required very low impedance. Moreover, thanks to its slow-wave effect, the R-CPS also reduces the size of the filter.…”

mentioning

confidence: 99%

Lowpass filter with slow-wave rail coplanar stripline (R-CPS)

Yang

Caloz

2009

Electron. Lett.

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The coplanar stripline (CPS) suffers from excessively high characteristic impedance which makes the design of filters difficult. Proposed is a slow-wave rail CPS (R-CPS) transmission line for the design of a stepped impedance lowpass filter. The R-CPS exhibits an extended low-impedance limit not achievable by conventional CPS, while retaining the advantages of the CPS. It also improves the performance of the filter in terms of suppression of the spurious harmonic passbands and reduces the filter size.Introduction: Uniplanar transmission lines, such as the coplanar waveguide (CPW) or coplanar stripline (CPS), exhibit several advantages over microstrip lines or striplines. CPW often incorporates a metal plate at the backside of the substrate, thereby forming a conductorbacked CPW (CB-CPW) [1 -3]. This back conducting plane reduces the characteristic impedance. CPS has all the benefits of CPW, and has a balanced configuration which is beneficial in circuits involving differential components, such as dipole antennas, balanced mixers and amplifier pairs. Considering a conventional CPS printed on a substrate of height h and dielectric constant 1 r , its characteristic impedance Z 0 [1] decreases when the gap distance between the strips g decreases, or when h increases and 1 r increases. Very high characteristic impedance can be easily achieved by simply increasing the gap between the two strips. However, it is generally difficult to provide low characteristic impedance for a given substrate because of limitations in the fabrication tolerance of the gap, especially on an electrically thin substrate, typically encountered in standard MMICs. This restriction severely limits the application of CPS in filters, where a large hi-lo impedance ratio is required. A tentative solution would be to introduce a conductor backed CPS (CB-CPS), analogous to the CB-CPW. However, additional common mode may be excited in a CB-CPS, except the expected differential transmission mode.In this Letter we propose a rail CPS (R-CPS) transmission line structure and apply it to a stepped impedance lowpass filter. The R-CPS is composed of a conventional CPS loaded with transverse strips at the back of the substrate, which resembles train rail tracks. It provides a dramatically extended lower impedance limit without reduction of the higher impedance limit, while preserving the CPS benefits of uniplanarity and differential configuration. Benefiting from the proposed structure, a seventh-order Chebyshev stepped-impedance lowpass filter with a cutoff frequency of 5 GHz and a passband ripple of 0.5 dB has been designed and measured. In conventional CPS technology, such a design is impossible on a relatively thin and low-1 r substrate [4,5] owing to the required very low impedance. Moreover, thanks to its slow-wave effect, the R-CPS also reduces the size of the filter. Finally, a broad stop-band, immune to some of the parasitic harmonic passbands, is achieved owing to the stop-bands of the periodic loading strips.

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A compact coplanar stripline lowpass filter

Cited by 10 publications

References 4 publications

A compact realization of composite low-pass filter for monolithic microwave integrated circuit applications

A compact realization of composite low-pass filter for monolithic microwave integrated circuit applications

A high-efficiency dual-frequency rectenna for 2.45- and 5.8-GHz wireless power transmission

Lowpass filter with slow-wave rail coplanar stripline (R-CPS)

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