On the design of novel compact broad-band planar filters

Menzel, Wolfgang; Li, Zhu; Wu, Ke; Bogelsack, F.

doi:10.1109/tmtt.2002.807843

Cited by 149 publications

(71 citation statements)

References 5 publications

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“…Due to enhanced capacitive coupling in series between microstrip and CPW strip conductors, the overall transmission passband can be expanded with two rejection zeros [13]. Following [14] and [15], this two-port transition structure with the two dissimilar microstrip and CPW feeders is characterized by implementing the short-open calibration (SOC) procedure in the full-wave method of moments (MoM).…”

Section: Introduction B Road-band Microstrip-to-coplanar-waveguidementioning

confidence: 99%

“…Herein, the two coupled-strip surfaces in conjunction with the lower CPW and upper microstrip are largely widened while the twin-slot width in the CPW is properly incremented, making up a frequency-dependent parallel-coupled microstrip/CPW section with tight coupling. Following the early research in [12] and [13], this coupled-strip structure can be perceived as an enhanced equivalent series-capacitive element at low frequency and a parallel-coupled transmission line with a tightly distributed coupling degree as frequency increases. Thus, this transition is expected to hold the broad-band transmission behavior with the high upper-end frequency, in which the coupled-strip length is approximately equal to the half-wavelength, as achieved in [12], [13], and [16].…”

Section: Introduction B Road-band Microstrip-to-coplanar-waveguidementioning

confidence: 99%

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Broad-Band Microstrip-to-CPW Transition via Frequency-Dependent Electromagnetic Coupling

Menzel

2004

IEEE Trans. Microwave Theory Techn.

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Abstract-An improved broad-band microstrip-to-coplanarwaveguide (CPW) transition is developed on a basis of the frequency-dependence characteristic of an electromagnetic surface-to-surface coupling. A self-calibrated method of moments is extended to model this unbounded two-port discontinuity with the two dissimilar microstrip/CPW feeding lines. Numerical results are provided to demonstrate its frequency response of transmission under varied strip/slot dimensions and further exhibit its attractive ultra-broad-band transmission with low radiation loss.

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Section: Introduction B Road-band Microstrip-to-coplanar-waveguidementioning

confidence: 99%

Section: Introduction B Road-band Microstrip-to-coplanar-waveguidementioning

confidence: 99%

Broad-Band Microstrip-to-CPW Transition via Frequency-Dependent Electromagnetic Coupling

Menzel

2004

IEEE Trans. Microwave Theory Techn.

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“…4 is the frequency-dependent -parameters of this coupling structure under different slot widths .A s is widened, the J-admittance peak is observed to rise up significantly as studied in [10]. Plus, the two quarter-wavelength resonators [9] [phases: and in Fig. 3(b)], the two transmission poles can be excited in the two sides of 6.85 GHz when 1.60 mm.…”

Section: Uwb Bandpass Filter:schematic and Principlementioning

confidence: 94%

“…In [7], a novel compact UWB BPF on microstrip line is constituted using a single multiple-mode resonator (MMR) that is driven at two sides by two identical parallel-coupled lines. The basic principle of this UWB filter originated in [8] and [9] to explore compact and broadband BPFs with the bandwidth of 60% 80%. In this work, a novel MMR-based UWB BPF, as illustrated in Fig.…”

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confidence: 99%

Ultra-wideband bandpass filter with hybrid microstrip/CPW structure

Wang

Menzel

2005

IEEE Microw. Wireless Compon. Lett.

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Abstract-A novel ultra-wideband (UWB) bandpass filter (BPF) is presented using the hybrid microstrip and coplanar waveguide (CPW) structure. A CPW nonuniform resonator or multiple-mode resonator (MMR) is constructed to produce its first three resonant modes occurring around the lower end, center, and higher end of the UWB band. Then, a microstrip/CPW surface-to-surface coupled line is formed and modeled to allocate the enhanced coupling peak around the center of this UWB band, i.e., 6.85 GHz. As such, a five-pole UWB BPF is built up and realized with the passband covering the entire UWB band (3.1-10.6 GHz). A predicted frequency response is finally verified by the experiment. In addition, the designed UWB filter, with a single resonator, only occupies one full-wavelength in length or 16.9 mm.Index Terms-Hybrid microstrip/coplanar waveguide (CPW), multiple-mode resonator (MMR), surface-to-surface coupled line, ultra-wideband (UWB) bandpass filter (BPF).

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“…The Electromagnetic Bandgap (EBG) structures are periodically arranged metallic or dielectric elements that exhibits one or more forbidden frequency bands where surface waves are prevented to propagate. As EBG structures exhibit forbidden bandgap by suppressing surface-wave propagation, the directions of research has been in suppression of parallel plate noise in printed circuit boards, integrated circuits and high speed circuits in general, low-cost filter design and construction [6]- [8], performance improvement in Microstrip antennas and mutual coupling reduction in antennas arrays [9]- [12]. Various 1D and 2D EBG structures have been studied extensively in the last decade.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Compact EBG Structures on the Mutual Coupling Reduction of Antenna Arrays

Margaret¹,

Subasree²,

Susithra³

et al. 2014

IJET

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Abstract-Mutual coupling is a critical issue in compact array design and reducing this is one of the main efforts in Microstrip antenna array design. Periodic structures can help in this situation by suppressing surface wave propagation in a given frequency range. The purpose of this work is to show the viability of using 2D EBG structures to this aim. This paper presents a double element Microstrip antenna array inserted with the EBG structures like conventional mushroom, Jerusalem cross slot and slot loaded EBGs around 5-6 GHz. The performances are compared for mutual coupling reduction. Simulated results verify the improvement in performance of the antenna array compared to the array antenna without EBG. The slot loaded EBG is found to be good showing a 5.8dB mutual coupling reduction. Index Terms-Electromagnetic bandgap (EBG) structures,microstrip antenna arrays, mutual coupling, surface wave. I. INTRODUCTIONMicrostrip antenna arrays have been popular for decades because they exhibit a low profile, small size, lightweight, low manufacturing cost, high efficiency, and an easy method of fabrication and installation. Furthermore, they are generally economical to produce since they are readily adaptable to hybrid and monolithic integrated circuits fabrication techniques at radio frequency (RF) and microwave frequencies however, significant degradation of performance happens due to mutual coupling between the antenna elements [1]. An antenna that is placed on a highpermittivity dielectric substrate may couple power into substrate modes. As substrate modes do not contribute to the primary radiation pattern, these modes are a loss mechanism which reduces as high as 60% of the radiated power and reduce the antenna efficiency.Various techniques are explicitly designed to suppress the surface wave. A straightforward way to reduce the mutual coupling of monopole antennas on high-impedance ground plane was developed in [2] In this paper, various EBG structures like conventional mushroom, Jerusalem cross slot and slot loaded EBGs are inserted between a two element microstrip line fed monopole antenna array to reduce the strong mutual coupling of coupled microstrip antennas. The performance and the mutual coupling are compared with and without the EBG structures with the Method of Moment simulations. II. EBG STRUCTURE CONFIGURATIONThe conventional mushroom like EBG structure was proposed in [3], [4]. It consists of four parts: a ground plane, a dielectric substrate, metallic patches and connecting vias as shown in Fig. 1(a). The operation mechanism of this EBG structure can be explained by an LC filter array which is shown in Fig. 1(b), the inductor L results from the current flowing through the vias, and the capacitor C due to the gap effect between the adjacent patches. For an EBG structure with patch width W, gap width g, substrate thickness h and dielectric constant ε r , the values of the inductor L and capacitor C are determined by the following formula: These formulas (1)- (4) are very simple and but their results...

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On the design of novel compact broad-band planar filters

Cited by 149 publications

References 5 publications

Broad-Band Microstrip-to-CPW Transition via Frequency-Dependent Electromagnetic Coupling

Broad-Band Microstrip-to-CPW Transition via Frequency-Dependent Electromagnetic Coupling

Ultra-wideband bandpass filter with hybrid microstrip/CPW structure

Comparison of Compact EBG Structures on the Mutual Coupling Reduction of Antenna Arrays

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