Dual-Mode Dual-Band Bandpass Filter Based on Square Loop Resonator

Deng, Kun; Yang, Shuai; Sun, Shou Jia; Wu, Bian; Shi, Xiaowei

doi:10.2528/pierc13010605

Cited by 11 publications

(17 citation statements)

References 17 publications

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“…f e1 − f o1 is controlled by the line widths of W 1 and W 2 [8,15], so the frequency separation can be calibrated by changing the line widths of the perturbation and the ring if the gap S 2 is changed. Therefore, we can conclude that the cross coupling has little effect on the filter performance and can be omitted during our design procedure.…”

Section: Filter Designmentioning

confidence: 99%

Microstrip Wideband Bandpass Filter Based on Square Ring Loaded Resonator

Deng¹,

Chen²,

Sun³

et al. 2013

PIER Letters

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Abstract-In this paper, a compact microstrip wideband bandpass filter (BPF) based on square ring loaded resonator (SRLR) is proposed. The SRLR is formed by loading a pair of bent open-stubs outside the diagonal corners of a square ring, which generates three split degenerated modes. The first two split modes form a dominant wideband passband. By introducing another pair of loaded open-stubs, the third split mode is moved into the passband to achieve an extra bandwidth for the wideband passband. Measured results show that this proposed BPF has a 3 dB fractional bandwidth of 69%, and the insertion loss of the BPF is less than 1.0 dB.

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Section: Filter Designmentioning

confidence: 99%

Microstrip Wideband Bandpass Filter Based on Square Ring Loaded Resonator

Deng¹,

Chen²,

Sun³

et al. 2013

PIER Letters

Self Cite

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“…Several methods for multi-band BPFs have been previously proposed [11][12][13][14][15][16]. As a very mature and popular technology, low temperature co-fired ceramic (LTCC) has attracted many people's interest in dual-band bandpass BPFs design in [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…In [13], the dual-mode square patch resonator is employed to achieve a dual-band bandpass filter. In [14], a dual-mode dual-band BPF is proposed by using asymmetric square loop resonators, and a pair of bent open-circuited stubs is installed to the loop as perturbation stubs. In [15,16], the fractal geometry of a complementary single split ring resonator is used to design tri-band BPF.…”

Section: Introductionmentioning

confidence: 99%

Compact and High Selectivity Tri-Band Bandpass Filter Using Multipath-Embedded Resonators

Yang¹,

Wu²,

Zhu³

et al. 2014

PIER Letters

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Abstract-In this paper, a novel compact tri-band bandpass filter (BPF) with compact circuit size and high passband selectivity has been presented and implemented using multipath-embedded resonator (MER). This filter includes two multipath-embedded stepped impedance resonators (SIRs), connected with stub-coupling at the symmetric plane. By tuning admittance ratio and length ratio of the multipath-embedded resonator, it can be designed at 1.84, 2.45, 3.05 GHz. Through internal edgecoupling and extemal zero-degree feed lines, a tri-band BPF can be achieved with compact circuit size, high passband selectivity and low insertion loss. The measured results validate the full-wave EM simulated results with good agreement.

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“…In [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], several techniques relating to planar dual-band filter design have been proposed. In particular, the commonly used approach is to use planar structures to achieve dual-band filter characteristics.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Filter for Wimax and Wlan With Improved Upper Stop Band Performance

Kamma¹,

Reddy²,

Parmar³

et al. 2014

PIER C

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Abstract-In this paper, a novel and compact dual-band filter with enhanced upper stop characteristics has been presented. Dual band pass filter characteristics are achieved by introducing transmission zero (TZ) in pass band of band pass filter (BPF). The wide band pass filter (BPF) is implemented by combining low pass filter characteristics (i.e., stepped impedance resonator) and high pass filter characteristics (i.e., short stubs). Closed rectangular ring resonator (CRRR) and open loop rectangular ring (OLRR) combination is used to produce two transmission zeros (TZs). One TZ is placed on the pass band of BPF such that resultant filter characteristic consists of two pass band. However, the second TZ is placed at edge of the pass band in BPF to improve skirt selectivity. The two pass bands are designed to cover two popular wireless bands namely WiMAX (center frequency f 1 (3.5 GHz) and WLAN (center frequency f 2 (5.7 GHz)) bands, i.e., 3.35-3.65 GHz and 5.5-5.85 GHz respectively. Equi-ripple low pass stepped impedance resonator (SIR) filter response is responsible for improved and spurious free upper stop band (> 20 GHz, i.e., > 6f 1 ) and also provides sharp skirt attenuation at upper stop band. The proposed filter is implemented on an RT/Duroid 5880 (ε r = 2.2) substrate with thickness of 0.785 mm and surface area of 19 × 12 sq · mm. Good agreement between simulated and measured results ensures that the proposed filter is a suitable candidate for modern dual band communications.

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Dual-Mode Dual-Band Bandpass Filter Based on Square Loop Resonator

Cited by 11 publications

References 17 publications

Microstrip Wideband Bandpass Filter Based on Square Ring Loaded Resonator

Microstrip Wideband Bandpass Filter Based on Square Ring Loaded Resonator

Compact and High Selectivity Tri-Band Bandpass Filter Using Multipath-Embedded Resonators

Dual-Band Filter for Wimax and Wlan With Improved Upper Stop Band Performance

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