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A compact low-pass filter (LPF) with wide rejection band based on T-type circuit of an enhanced dual composite right-/left-handed (D-CRLH) resonator is presented in this paper. The resonator has only one cell with series and parallel tank circuit. The parallel LC tank circuit has been realized by an interdigital capacitor and one shorted finger, whereas its series LC tank circuit is realized by an air gap capacitance and a short circuit stub. The filter has wide rejection band bandwidth with three transmission zeros (TZs). The filter bandwidth and TZs frequencies are controlled by the D-CRLH element values. The results of the proposed filter demonstrate minimum insertion loss in passband, high roll-off rate, and good figure of merit. The measured results are in good agreement with the simulated results. The detailed filter design is discussed in terms of circuit modeling, dispersion analysis, and full-wave simulation. Finally, the filter size is compact (0.10 λg × 0.15 λg) at cut-off frequency.

A miniaturized dual‐band metamaterial (MTM) antenna has been designed in this article. The designed coplanar waveguide fed antenna has composed of inner split‐ring resonator and an outer open ring resonator with rectangular stub. The series parameter of the antenna is used to determine the zeroth order resonance frequency due to short‐ended boundary condition. The whole size of proposed structure is 20 × 25.5 mm2. This MTM antenna exhibits dual‐band operation at 3.17 GHz (3.1–3.22 GHz) and 5.39 GHz (5.27–5.47 GHz). The proposed MTM structure achieves measured peak gain of 0.71 and 1.89 dB at 3.17 and 5.39 GHz, respectively. The proposed antenna can be used for recent radio communication in form of S‐band application and Wi‐MAX.

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Abstract-A compact via-less metamaterial (MTM) wideband bandpass filter using split circular rings, meander-line and rectangular stub is reported in this letter. The split circular rings produce series capacitance and a meander line along with a rectangular stub gives shunt inductance and capacitance. The measured insertion loss has 0.60 dB and return loss above 15 dB with 3 dB fractional bandwidth 74.28% at centre frequency 3.25 GHz. The zeroth order resonance frequency of proposed filter is guarded by shunt parameters due to its open ended boundary condition. The electrical size of the suggested filter is 0.12λ g × 0.22λ g at ZOR frequency of 2.3 GHz. The designed structure has been fabricated and experimentally validated. The designed filter offers group delay variation between 0.2ns to 0.7 ns within the passband. It is suitable for WLAN, WiMAX, Bluetooth applications.

Abstract-In this paper, a new compact tri-band bandpass metamaterial (MTM) filter based on meander line with a rectangular stub is proposed and designed. The pseudo connections between meander line and ports generate interdigital capacitor (IDC) to provide series capacitance. Meander line with a rectangular stub realizes a virtual ground concept here. To validate the MTM property of the proposed filter structure, a dispersion diagram is plotted. The proposed filter offers measured first passbands from 1.88-4.0 GHz; second band starts from 5.4-5.9 GHz; third passband ranges from 7.1-7.4 GHz. It has insertion losses of 0.8 dB, 1.5 dB and 2.0 dB at 2.1 GHz, 5.7 GHz and 7.3 GHz centre frequencies, respectively. The designed filter will cover S band (2-4 GHz), ISM band (5.725-5.875) and fixed satellite services (7.25-7.3 GHz). Further, the designed filter shows electrical size of 0.14λ 0 ×0.13λ 0 at zeroth order resonance (ZOR) frequency 2.1 GHz.

A new CPW-fed bandpass filter based on zeroth order resonant (ZOR) technique is presented in this paper. Proposed filter structure is designed on a CPW single layer where via is not required, hence reduces fabrication complexity. The property of metamaterial of ZOR has been utilized to reduce the filter size. The proposed structure is symmetrically CPW-fed and contains tuning-fork stub, which connects patch to CPW ground plane. The metamaterial properties are characterized by plotting dispersion diagram of proposed structure. The experimental result of proposed filter design shows an insertion loss of 0.51 dB, return loss of 22.5 dB with fractional bandwidth 61.5 % at centre frequency 2.60 GHz. The size of the filter is 0.45 λg×0.36 λg (λg is the guided wavelength at centre frequency).