Novel filter using composite right/left-handed transmission line

Li, Jiusheng

doi:10.1002/mop.21860

Cited by 8 publications

(8 citation statements)

References 11 publications

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“…The concept of composite right/left-handed (CRLH) trmission line, introduced by Caloz et al In [4], shown great potential in engineering applications [5]. One of the most interesting field is the filter applications [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Miniature filters based on Metamaterials with transmission zeros and wide upper-stopband performance

Peng

Ruan

Ding

2009

2009 3rd IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

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In this paper we have proposed a Metamaterial based Composite Right-Left Handed transmission line new structure with microstrip gap capacitor and stub inductors shorted to the ground plane by via to achieved miniature filters with two transmission zeros and wide upper-stopband performance. The proposed designs take advantage of different aspects of metamaterial behaviour to achieve miniature and wide upper-stopband characteristics. The designed filter has a compact structure with overall dimensions of 1/7 Ȝ g by 1/10 Ȝ g . The designed filter type 2 has two transmission zeros at 2.66 GHz and 3.25 GHz, a 3 dB bandwidth of 29.8% at 1.51 GHz, insertion loss of -3 dB, attenuation greater that 55 dB in the lower stopband and the attenuation at higher stopband is greater that 17 dB extend to a frequency higher that 8 GHz.

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Section: Introductionmentioning

confidence: 99%

Miniature filters based on Metamaterials with transmission zeros and wide upper-stopband performance

Peng

Ruan

Ding

2009

2009 3rd IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

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“…In other ways, because the first experimental demonstration of a double negative medium by Smith et al in 2000 [7] and the concept of composite right/left-handed (CRLH) transmission line was introduced by Caloz et al in 2003 [8,9], a large number of filters design using these theory have already been demonstrated [10][11][12][13][14][15]. Complementary split-rings resonators and series gaps were both used in [10,11], and grounded stubs and open stubs were also blended in [10,11], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Complementary split-rings resonators and series gaps were both used in [10,11], and grounded stubs and open stubs were also blended in [10,11], respectively. Interdigital coupled lines and grounded stubs were used as series capacitors and shunt inductors in [12], whereas lumped elements were used in [13] to construct CRLH transmission for BPF application. In [14], two linear arrays of metallic vias and short-stubs inductors were used to generate shunt inductors besides the series interdigital capacitors.…”

Section: Introductionmentioning

confidence: 99%

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Design of a compact, wide stopband microstrip band‐pass filter

Peng

Ruan

Ding

et al. 2010

Micro & Optical Tech Letters

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a small variation in the antenna gain is seen for both proposed and reference antennas.In designing UWB antennas, it is insufficient to evaluate the antenna performance solely in traditional well-defined parameters such as VSWR, radiation patterns, and gain. It is crucial to evaluate the system transfer functions as the transmitting and receiving antennas are viewed as a whole system [10][11][12][13][14]. For UWB applications, the magnitude of the transfer function should be as flat as possible in the operating band. The group delay is required to be constant over the entire band as well. A transmitting-receiving antenna system whose transfer functions satisfy these requirements will introduce limited distortions to base band signals.In this article, the system transfer function, which is in essence the transmission scattering parameter S21 of a two-port network, was measured by using an HP8722ES vector network analyzer with a pair of proposed antennas serving as the transmitting and receiving antennas.The transmitter and receiver are positioned face to face and side by side, respectively, with a distance of 15 cm, as plotted in Figure 7. It should be noted that the measurement was carried out in a real environment with reflecting objects in the surrounding area.Measured magnitude of the transfer function is shown in Figure 8. From the measured results, it can be seen that at the notched band the attenuation is more than 20 dB, and the magnitude outside of the notch band in 3.1-10.6 GHz is relative flat. Then it reveals that stable band-notched characteristic of the proposed UWB antenna has been obtained. The two magnitude curves for both scenarios, that is, face to face and side by side, are almost identical.The measured group delay is given in Figure 9. The variation of the group delay for both scenarios, that is, face to face and side by side, is within 1.5 ns across the whole UWB except the notched band in which the maximum group delay is nearly 3 ns. The group delay of the antenna systems corresponds well to the magnitude of the transfer function. Therefore, it proves that the antenna has a good time-domain characteristic and a small pulse distortion as well. CONCLUSIONSA printed circular-ring monopole antenna for UWB application has been investigated, which presents a band-notched characteristic in WLAN band by attaching a C-shaped short-circuited stub. The transfer functions of the antenna system correspond well to the VSWR. With the proposed antenna design, band notching can be easily obtained without the use of external filters, which can greatly simplify the circuit design of a communication system. filter has a compact structure with overall dimensions of 20 mm by 17.05 mm, a 3-dB bandwidth of 25.2% at 1.19 GHz, insertion loss of À3 dB, attenuation greater that 60 dB in the lower stopband and greater that 27 dB up to 5.2 times the centre frequency.

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“…Several methods and structures have been used to achieve wide bandpass filters [1][2][3][4][5][6]. In addition, novel small size and low insertion loss bandpass filters are also required in wireless communication technology such as the Digital Communication System (DCS, 1710MHz~1880MHz) [7].…”

Section: Introductionmentioning

confidence: 99%

Bandpass filters utilizing simplified left-handed transmission line structure

Han

Feng

2008

2008 International Conference on Microwave and Millimeter Wave Technology

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In this paper, we propose a new approach to design bandpass filter based on a simplified left-handed transmission line (TL) structure. We demonstrate the filter design by two examples, an ultra-wideband (UWB) bandpass filter with a fractional bandwidth (FBW) of about 110% and a narrow-band bandpass filter centered at 1.8 GHz covering the Digital Communication System (DCS) band.The main design procedure is to define and realize the parameters of the capacitors and the inductors in the transmission-line unit cell. This novel filter design method described in this paper can be used to achieve any optionally designated passband conveniently. The design has been successfully realized in theory, and verified by both full-wave electromagnetic simulation and microwave circuit simulation. The UWB bandpass filter is also fabricated and measured to demonstrate the performance, which agrees well with the theoretical analysis and simulation. Keywords-bandpass filter (BPF), left-handed transmission line, ultra-wideband (UWB).

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Novel filter using composite right/left-handed transmission line

Cited by 8 publications

References 11 publications

Miniature filters based on Metamaterials with transmission zeros and wide upper-stopband performance

Miniature filters based on Metamaterials with transmission zeros and wide upper-stopband performance

Design of a compact, wide stopband microstrip band‐pass filter

Bandpass filters utilizing simplified left-handed transmission line structure

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