Improvement of stopband using a spiral defected microstrip and defected ground structures

RoyChoudhury, Somdotta; Parui, Susanta Kumar; Das, Santanu

doi:10.1109/aemc.2011.6256881

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Figure 4 gives derivation from the conventional microstrip transmission line to the DGS, DMS, and various spurlines. As depicted in [5,6], the DGS, DMS, and quarter-wavelength spurline can all be equivalent to a parallel network of resistance, inductance, and capacitance (RLC). In practical design, this parallel network is cascaded into the component and can produce a TZ at a specific frequency.…”

Section: T-shaped Spurlinementioning

confidence: 99%

“…Its modified forms-folded SIR (FSIR) and U-shaped SIR (USIR)-can achieve further size reduction [4]. On the other hand, some interesting techniques, such as defected ground structure (DGS), defected microstrip structure (DMS), spurline, and source-load coupling, have been proposed to improve the performance of microstrip filters [5][6][7]. In [8], both the SIR and spurline are utilized to develop a balanced filter with wide stopband.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Transversely Compact Single-Ended and Balanced Bandpass Filters with Source–Load-Coupled Spurlines

Yan

Huang

et al. 2019

Electronics

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Multi-function wireless systems demand multi-channel transmit/receive (TR) modules, particularly as multiple functions are required to operate simultaneously. In each channel, passive components, including bandpass filters, must be compact, or at least transversely compact; thus, the entire circuitry of the channel will be slender, and consequently multiple channels can be parallel-arranged conveniently. In this work, single-ended and balanced bandpass filters for multi-channel applications are presented. As a unique resonator, the U-shaped stepped impedance resonator (USIR) can achieve size miniaturization compared with its corresponding uniform impedance resonator (UIR) counterpart. Hence, with the utilization of USIRs, the proposed bandpass filters are able to acquire compact transverse sizes. Moreover, by using the source-load coupling scheme, two transmission zeros (TZs) are respectively generated at the lower and upper sides of the passbands, which is useful for improvement of the selectivity performance. In addition, spurlines are introduced at the input and output ports to produce another TZ to further enhance the stopband performance, which cannot be acquired by the UIR or stepped impedance resonator (SIR). To verify the aforementioned idea, one single-ended and one balanced bandpass filter are implemented, with experimental results in good agreement with the corresponding simulations. Meanwhile, as compared with some similar works, the proposed balanced filter achieves compact transverse size, sharp selectivity skirt, and wide stopbands up to the fourth-order harmonic with suppression over 20 dB, which illustrates its suitability for differential signal transmission application in microwave circuits and systems.

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Section: T-shaped Spurlinementioning

confidence: 99%