Wireless Communication

Amita Sharma ¹, Monish Gupta ¹

Affiliations
1 Electronics and Communication Engineering Department, University Institute of Engineering & Technology, Kurukshetra University, Kurukshetra, IN

Abstract

In this paper, a bandstop filter has been designed using a cylindrical shaped split ring resonator (SRR) that is a common work house for metamaterial and a microstrip transmission line resonating at 8.2 GHz, 6GHz, 5GHz, 4GHz and 3 GHz respectively with varying attenuations. It has also been observed that as the external radius of ring increases, resonating frequency decreases i.e. radius is inversely proportional to frequency. In simple words, only the radius of ring is to be changed with split gap, width of ring and other parameters constant. Firstly the ouput of RF signal will be observed without any SRR structure and then the effect of inserting SRR below the microstrip line will be in seen in terms of S12 parameter. These filters have a wide application in the field of wireless communication in RF front end devices.

Keywords

Band Stop Filter, Metamaterials, Microstrip Line, Split Ring Resonators.

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Monish Gupta ¹, Jyoti Saxena ²

Affiliations
1 Electronics and Communication Engineering Department, University Institute of Engineering & Technology, Kurukshetra University, Kurukshetra, IN
2 Electronics and Communication Engineering Department, Punjab Technical University, Giani Zail Singh Campus, Bathinda, IN

Abstract

For many applications microstrip antenna is well suited because of its properties like lightweight, planar structure and ease of fabricating, but have limitation of low band width and gain. In this research, a design technique for enhancing gain and bandwidth of microstrip patch antenna in ultra wide band frequency spectrum is proposed. This paper presents the design of series fed microstrip patch antenna array with metamaterial. A series resonant array structure is chosen which is compact and easy to excite. The designed antenna exhibits not only high-gain but also broadband characteristics. By using antenna array we can improve performance of the antenna like directivity, gain, bandwidth and other parameters which are difficult to achieve with the single element. Performance of antenna array can further be improved if we can reduce the mutual coupling between the elements. In this research we are designing patch antenna array of five elements which is fed by a microstrip line. SRR metamaterial is introduced in the array design to improve the mutual coupling between the patch elements. The advantage of this antenna is that it provides an overall planar structure. This antenna may find application in modern communication systems and radar systems.

Keywords

Filter, Split Ring Resonator, Metamaterial.

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Preeti Bhalla ¹, Monish Gupta ²

Affiliations
1 University Institute of Engineering and Technology, Kurukshetra University, Kurukshetra, IN
2 University Institute of Engineering and Technology, Kurukshetra University, Kurukshetra, IN

Abstract

In recent years, there have been several new concepts applied to distributed microwave circuits. One such technique is defected ground structure or DGS, where the ground plane metal of a microstrip (or stripline, or coplanar waveguide) circuit is intentionally modified to enhance performance. Defected ground structure (DGS) for the microstrip line, which has period etched defects in the backside metallic ground plane, is one recent hotspot of microwave circuit design. This paper presents advantages of filters using DGS technique over PBG and EBG techniques and also demonstrates the approach to overcome the limitation inherent in conventional microstrip and strip line BPFs having parallel coupled lines and high-performance low-pass filter (LPF). And also presents the DGS element and characteristics, application of DGS and at last the disadvantages of DGS. DGS provides an excellent performance in terms of Ripples in pass-band, Sharp selectivity at cut-off frequency, spurious free wide stop-band. There is a comparison of photonic bandgap (PBG) and electromagnetic bandgap band (EBG) with DGS, where DGS has simple structure and potentially great applicability to design microwave circuits such as filters, couplers, amplifiers and oscillators.

Keywords

Defected Ground Structure (DGS), Photonic Band Gap (PBG), Electromagnetic Band Gap (EBG), Electromagnetic (EM), Low Pass Filter (LPF), Band Pass Filter (BPF), Co-Planer Waveguide (CPW).

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Monish Gupta ¹, Jyoti Saxena ²

Affiliations
1 Electronics and Communication Engineering Department, University Institute of Engineering and Technology, Kurukshetra University, kurukshetra, IN
2 Electronics and Communication Engineering Department, Giani Zail Singh College of Engineering and Technology, Bathinda, IN

Abstract

In this paper, filter characteristics of waveguide loaded with Split Ring Resonator (SRR) are presented. It is demonstrated that transmission coefficient S12 reduces to -39 db after insertion of SRR which was zero without insertion of SRR at 1 G Hz. Which shows that after insertion of SRR in the waveguide signal of frequency 1 G Hz is unable to reach to port 2 from port 1 of waveguide i.e Split Ring Resonator of our design is acting as filter at frequency of 1 G Hz. The effect of variation of dimensions of SRR on filter characteristics is also presented. It is observed that by decreasing the outer radius of SRR and by keeping all other dimensions constant the operating frequency of filter shifts toward higher side. By increasing the inner radius of SRR and keeping all other dimensions constant the operating frequency of filter shifts toward lower side. A band reject filter is also presented by combination of SRR filter of different dimensions. In our work we have designed SRR filter for 1 G Hz. When outer radius of filter is decreased filter characteristics is observed at frequency of 1.16 G Hz. When inner radius of filter is increased filter characteristics is observed at frequency of 0.95 G Hz. When combination of these three filters is used band stop characteristics is observed at frequency range from 0.91 G Hz to 1.11 G Hz. All simulations are done with Anasoft HFSS.

Keywords

Filter, Split Ring Resonator, Metamaterial.

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