See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/335578622 Performance Improvement of Slot Antenna Using Various Parameters and Band Pass Filter Conference Paper · December 2018 DOI: 10.1109/ICCSDET.2018.8821207 CITATIONS READS 9 48 2 authors: s. Kannadhasan Nagarajan Ramalingam Study World College of Engineering Gnanamani College of Technology 166 PUBLICATIONS 144 CITATIONS 116 PUBLICATIONS 903 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: POWER FECTRONICS View project RESEARCH PAPER View project All content following this page was uploaded by Nagarajan Ramalingam on 02 August 2020. The user has requested enhancement of the downloaded file. SEE PROFILE Performance Improvement of Slot Antenna Using Various Parameters and Band Pass Filter S. Kannadhasan Department of Information and Communication Engineering AnnaUniversity Chennai, Tamilnadu, India email@example.com Abstract— Slot antenna using a first and second order band pass frequency selective surface of a substrate with enhancement of gain is presented in this paper. The in-phase transmission of waves radiated from the antenna over a 3dB bandwidth of about 60% is allowed in each layer by the proposed antenna. This design facilitates an enhancement of up to 4dB bandwidth over entire frequency of 6GHz and 12GHz. The insertion loss between the two transmission poles along side a linearly decreasing transmission section over the band is low provided by the structure. Keywords— Slot, Frequency selective, Gain and Band Pass Filter I. INTRODUCTION Ultrawide band antenna is being widely used and the greatest interest of the researchers for its increasing demands of high data transmission and integration etc., . These antennas are applicable in ground penetrating radar (GPR) medical imaging, and multimedia communication, . These antennas radiate each direction orthogonal to the divergent plane,  - . The improved gain within the broadside direction aspect in conjunction with beside at the side of together with reduced side lobe levels finding its application microwave radar and mm wave systems are provided by the directional radiation from the antenna  . It is a difficult job for the sweetening of gain or radial asymmetry if these antennas in a very specific direction over a good band of frequencies. Ultra wideband (UWB) remote correspondence permits high rate information transmissions with low power level have set out extraordinary research interests for remote interchanges applications in the 3.1GHz to10.6 GHz frequency band. Elite UWB receiving require both great impedance coordinating and low flag contortion inside the relative recurrence groups,  - . Microstrip antenna are generally utilized in remote and cell versatile correspondence frameworks as a result of their benefits, similar to smallness, light weight and simplicity of manufacture and LPDAs likewise have a sensible gain with a huge transfer speed. Microstrip antenna can be nourished by an assortment of strategies. These techniques can be characterized into two classes reaching and non-reaching. In the reaching technique, the RF control is bolstered specifically to the transmitting patch utilizing an interfacing component, for example, a microstrip line,  - . In the non-reaching strategy, electromagnetic field coupling is done to exchange control between the microstrip line and the emanating patch. 978-1-5386-0576-9/18/$31.00 ©2018 IEEE R. Nagarajan Department of Electrical and Electronics Engineering Gnanamani College of Technology Namakkal, Tamilnau, India Krnaga71@yahoo.com There are four most prominent procedure utilized here they are i) Microstrip line ii) Coaxial line iii) Opening coupling iv) Vicinity Coupling. Microstrip antenna has emanating component on one side of a dielectric substrate and along these lines might be sustained by any of this four method. Co-ordinating is normally required between the fed line and the receiving wire input impedances . Radiation and transmission line modes created on the ESPA are depicted and an equal circuit is gotten from the modular hypothesis . The proportional circuit portrayed in detail to accomplish wideband and multiband attributes. For wideband ESPAs, the hypothetical most extreme transmission capacity is determined under VSWR rule . ESPA demonstrates double band qualities with the most extreme return misfortune estimation of -21.4dB and 24.9dB at 1.73GHz and 2.40GHz separately. Wide data transfer capacity can be accomplished for the planned reception apparatus by picking a thick supporting substrate between the slot and the ground plane . II. SLOT ANTENNA The rapid development of wireless communication technology has increased the demand for compact microstrip antennas with high gain and wideband operating frequencies. Microstrip patch antennas are very advantageous because of their low cost, low profile, light weight and simple realization process. However, the general microstrip patch antennas have some disadvantages such as narrow bandwidth. Enhancement of the performance to meet the demanding bandwidth is necessary. There are numerous and well-known methods to increase the bandwidth of antennas, including increase of the substrate thickness, the use of a low dielectric substrate, slotted patch antenna, the use of various impedance matching and feeding techniques. = 2 (1) ( )/ ) Where Co – speed of light in free space (3x108 m/s) fr- desired resonating frequency Er- relative permittivity of substrate (Er= 4.4 forFR4) Thickness of substrate hs =1.2mm A= 0.35+0.525=0.875 (2) (3) 4 4 Design of a small strip line fed slot antenna, wherever a square formed slot was chosen within the ground structure with a selected angle of rotation. These types of slot have excited two shut resonant frequencies resulting in a good information measure the bandwidth. A slot antenna within the frequency band of 1GHz and a pair of 2GHz is intended for the aim of gain enhancement over the complete in operation and therefore the slot length is employed to see the primary resonating frequency. ∅= 2 ∆ ∅= 1 = 2 TABLE 1: ANALYSIS OF SUBSTRATE LAYER (6) These slots radiate sort of a 0.5 half wave dipole whose length is half the wave length cherishes the resonating frequency. The slot size is chosen as half of the guided wavelength corresponding for exciting the first resonance near 1.6GHz and is given in following equation. = (7) 1 = = 2 (8) √ (9) 4 1 + = − − − (10) (11) The above equation gives a slot length of 12 mm. The slot has been rotated at an angle of 450 to achieve the 2nd resonance near 2GHz. The slot antenna is used to justified and analysis is simple to design the rectangle with some coordinates like 1, 2, 3 and 4 is below the equation to find the radius and velocity with respect to frequency is Shown in Fig.1. = − 2 R = μN (0) 180 4πa 3 Radius=0.2 Velocity=9.2 Frequency= 2.0 GHz then 8.858-j0.7471 (12) (13) 3 Fig.1. Slot Parameters (5) = = 2 (4) ∆ 3 Sl.No Parameters 1 S1=1.3 2 S2=0.9 3 S3=0.4 4 R1=0.2 5 R2=0.4 6 R3=0.6 7 S1=0.6 8 S2=1.3 9 S3=0.7 10 R1=0.9 11 R2=0.2 12 R3=0.7 Value of A 0.35 0.525 Gain enhancement of the substrate layer for the proposed slot antenna is shown in Table. 1. The dimensions of each and every slot antennas corresponding to the resonating frequency are much smaller than the wavelength due to the non resonant nature. The layer grid of the slot based on the middle layer with the width of Slot W. =( =( =( =( =( =( − − − − − − ) ) ) ) ) ) A= 1 (S -R )-(S -R ) 2 (14) Based on the periodicities of the every slot width of the each layer are same in x and y direction. The first and third slot patch type layer are modeled as parallel capacitors Cs and Cs , where the slot of the aperture with the middle layer is modeled as a parallel inductor L2 due to non- resonant in nature. The dielectric substrate with the height of hu and hL due to the transmission line of impedances 20 / Er1 and 20 / Er2 respectively where Er1, Er2 is dielectric constants of substrate 20 Ω -377Ω is the free space impedance. The equivalent circuit model with a series inductor and shunt capacitor represents the transmission line sections. III. DESIGN OF SLOT ANTENNA H- Field Here are the different parameters for Butterworth filter response for the first and second order coupled resonator filter as shown in Table. 2. TABLE 2: PARAMETERS OF BUTTERWORTH FILTER RESPONSE Frequency Cs (pF) Cs (pF) L2(nH) 1.81 3.858 6.545 2.590 2.4 3.760 5.250 2.972 3.5 2.490 5.800 1.150 ( L2 L3 L4 Cs L5 Cs Cs A1 − ∅ )∅ = ( (21) − )∅ − (22) IV. RESULTS AND DISCUSSION The L1 and L2 inductors for TEM transmission line can be calculated. The values of capacitors Cs and Cs of capacitive layers can be obtained from Fig.2. L1 = A2 Fig.2. Equivalent Circuit of the Proposed Work The prototype of the slot antenna each and every dimension of the overall structure by using the sub structure below the wavelength corresponding to the center frequency of operation an order of 0.12 λo is the unit cell dimensions and the 0.02 λo is shown in Fig.3 (a) & (b). In the ground planar of antenna the dimension of the slot is 0.2 λo. The height H is 12 mm and small variation between 6 mm and 12mm but it initially kept at λo /2 /λo corresponding to the 1st resonating frequency. A radiation from H-plane offers an average difference of about 20dB. E-plane radiation this difference is about 30dB between cross polar components. The proposed slot along with band pass through constructive interference efficiently enhance gain of the antenna in broadside direction of radiation over the entire frequency band is shown in Fig.4. Simulated reflection coefficients of the antenna are shown in Fig.5 for different value of H. The center frequency of Butterworth filters for desired response of layer at the frequency band 1GHz2GHz. The linear variation of the transmission poles for both the zero phases is varied with frequency in between which is clear from the phase verses frequency plot. = ∅ = ∅ + = +( − √ √2 )∅ = 0 (15) Order 7 (16) Order 5 Order 3 3rd line = ( − −ℎ (17) ) = Fig. 3 (a) Butterworth Filter with Different Order (18) (19) The various slot antennas due to the insertion loss of less than 1dB by using the both of the transmission poles and each and every slot near the center frequency is given in the pass band. The conventional microwave substrate based on the higher loss tangent 0.02 using FR4 substrate. With respect to the center frequency the 3dB transmission and reflection band width of band pass FSS is around 60%. E- Field = ∅ (20) Fig.3 (b). Butterworth of the Designed Band Pass Order S11 S12 -3dB Fig.4. S-Parameters of the Slot Antenna 0 R e fle c tio n C o e ff ic ie n t ( d B ) -5 -10 -15 -20 -25 -30 -35 -40 -45 0 2 4 6 Frequency / GHz 8 10 12 Fig.5. Reflection Coefficient of Antenna with Different Height V. CONCLUSION A wide slot antenna based on the selective frequency by using a first and second-order band pass frequency selective surface has been studied and demonstrate successfully due to the non-resonant nature of patch and gird type substrate layers, the structure of the slot is very low profile. This slot design also allows a variation of gap between the antenna and Substrate by around 4mm without significant degradation in its performance. 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