Novel Tri-Band Bandpass Filter With High Selectivity

Cao, Liangzu; Yin, Lin

doi:10.2528/pierl14121302

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…The insertion loss method using the coupling coefficient M i,j and the external quality factor Q en has been used to satisfy the specifications of all of the passbands. These parameters are respectively calculated using the following two equations [13]:…”

Section: Analysis Of the Implemented Resonatormentioning

confidence: 99%

A Compact Tri-Band Bandpass Filter Using Two Stub-Loaded Dual Mode Resonators

Rahman¹,

Park²

2018

PIER M

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In this paper, we present a compact tri-band bandpass filter (BPF) using two stub-loaded dual mode resonators (SLDMRs) combined with intra-coupled internal resonators. The designed filter operates at 1.575, 2.4, and 3.45 GHz, corresponding to the GNSS, WLAN, and WiMAX applications, respectively. The passbands of the filter are determined by odd-and even-mode frequencies created by the SLDMR and the internal open loop resonator inside of it. The corresponding even-mode frequency can be adequately tuned by adjusting the length of the stub while the odd-mode frequency is fixed. Two transmission zeros (TZ's) are introduced on each side of the passband to improve the selectivity of the implemented filter. Five TZ's around the edges of three passbands make the passbands highly isolated, and these TZ's can be placed according to the desired choice. The proposed tri-band BPF was designed, fabricated and measured, and the simulated and measured results corresponded very well.

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Section: Analysis Of the Implemented Resonatormentioning

confidence: 99%

A Compact Tri-Band Bandpass Filter Using Two Stub-Loaded Dual Mode Resonators

Rahman¹,

Park²

2018

PIER M

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“…The tri-band bandpass filter in Rahman et al (2018) makes use of double resonators to realize passband conditions at 0.98, 1.57 and 1.88 GHz. In addition to the above stub loaded resonators (Lan et al , 2015; Wei et al , 2015), asymmetric stepped impedance resonators (Chen et al , 2011), ring resonators (Luo et al , 2011a) and interdigital structures (Cao and Yin, 2015) are widely explored in literature for realizing triple passband characteristics in microwave filters.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of miniaturized tri-band microwave bandpass filter

Ponnammal

Manjula

2022

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Purpose This paper is aimed to study the design of a miniaturized filter with tri-band characteristics. In this paper, perturbation is used to realize circuit miniaturization and multi-band by exploiting the inductive property. During this process, vias are added for twofold benefit, namely, circuit miniaturization and enhanced frequency selectivity at high frequency. Thus, with the introduction of the shorting via, the single-band dual-mode bandpass filter is converted into a tri-band filter with a smaller electrical size. Design/methodology/approach This paper presents the design and characterization of a miniaturized two-port filter with tri-band operating characteristics. The proposed filter is constructed using a square patch resonator operating at 5.2 GHz with a capacitively coupled feed configuration. A square perturbation is added to the corner of the square patch to achieve diagonal symmetry and to excite dual mode. The perturbation offers a sharp transmission zero defining bandwidth of the proposed filter. In addition, a shorting post is introduced to achieve an 88% size reduction by lowering the operating frequency to 1.8 GHz. Findings The prototype filter has insertion less than 1.2 dB and return loss better than 12 dB throughout all the realized frequency bands. The prototype filter is fabricated and the simulation results are validated using experimental measurements. The realized fractional bandwidths of the proposed bandpass filter are 11/5.6/1 at 1.8/4.6/5.85 GHz, respectively. The quality factor of the proposed antenna is greater than 80 and a peak Q-factor of 387 is realized at 5.85 GHz. The high Q-factor indicates low loss and improved selectivity. The rejection levels in the stopband are greater than 20 dB. Originality/value The results indicate that the proposed filter is a suitable choice for low-power small-scale wireless systems operating in the microwave bands. The realized filter has the smallest footprint of 0.36λeff × 0.19λeff where λeff is the effective wavelength calculated at the lowest frequency of operation.

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Novel Tri-Band Bandpass Filter With High Selectivity

Cited by 2 publications

References 16 publications

A Compact Tri-Band Bandpass Filter Using Two Stub-Loaded Dual Mode Resonators

A Compact Tri-Band Bandpass Filter Using Two Stub-Loaded Dual Mode Resonators

Design and implementation of miniaturized tri-band microwave bandpass filter

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