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Usually a defected ground plane structure (DGS) provides only a band-reject response. However, in this work we introduce a simple band-accept circuit element in the DGS and developed a microstrip stub type compact 3-pole bandpass filter (BPF) at 4.2 GHz. The BPF has bandwidth and insertion loss 38% and 0.6 dB respectively. It has better than 25 dB rejection in the stopband up to 12 GHz.

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In this paper, a compact monopole wideband antenna is designed and manufactured for ultra‐wide band (UWB) applications. In order to extend the impedance bandwidth of the proposed antenna, rectangular and triangular slots are etched from the partial ground and from the center of the rectangular patch respectively. Also, by cutting the lower corners of the radiating patch using stepped technique, additional resonances are regenerated and lead to further improvement in the covered bandwidth. The proposed patch antenna has advantageous of compactness its overall size equals 40 × 40 mm2.Simulated and measured results show that the proposed antenna design exhibits a bandwidth from 2.9 – 19.2 GHz for VSWR< 2. The antenna structure provides a wide usable fractional bandwidth of 148%. These inherent characteristics of the proposed antenna make it suitable for efficient transmission and reception in UWB systems. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1514–1519, 2016

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the location of two operating frequencies can be arbitrarily controlled by the combination of WS 1 and LS 1 . CONCLUSIONIn this article, a novel filtering crossover structure had been presented. By introducing inset feed approach on the circular patch element, the filtering crossover can be easily implemented. To extend the operating frequency, the stub loading mechanism is employed on the basic filtering crossover structure. The proposed approach offers low circuit complexity and high design flexibility such as the freedom to control frequency ratio. Examples of the proposed filtering crossovers are designed and verified by simulation and measurement.

In this paper we present a new concept for implementing cascaded lowpass filters and multi-layer LPF by employing fl-arrowhead resonators as a defected ground structure (DGS) and as a resonator cell in the upper layer. The effect of the arrowhead area of a DGS on the performance of the conventional LPF is examined. The LPF is designed easily by extracting the equivalent circuit elements of a uniform arrowhead DGS slot and compensating for the capacitance of the transmission line [1]. The proposed multi-layer LPF is 50% shorter than the conventional LPF. Only two cells of the new structure are necessary to obtain better performance by suppressing ripples and enlarging stopband. The measured results show excellent agreement with simulated and equivalent circuit results.