A NOVEL L SHAPE MICROSTRIP PATCH ANTENNA

Priyanka Jain 1 , Vikas Maheshwari 2 and Vandana Vikas Thakre 2 . 1. Deptt. of ECE, Amity School of Engg & Technology, Amity University Madhya-Pradesh, Gwalior, M.P., INDIA. 2. Deptt of ECE, Madhav Institute of Technology and Science, Gwalior, M.P., INDIA. ...................................................................................................................... Manuscript Info Abstract ......................... ........................................................................ Manuscript History


…………………………………………………………………………………………………….... Introduction:-
In recent instance the requirement for the multi mode antenna is demanded for person to person communication network which have been rising. The growing amount of mobile services incorporated into particular telecommunication system which has made multiband function an important characteristic of mobile phone antennas [1]. In current years, the dual-band or multi-band antennas contain a huge awareness for application towards multimode communication systems [2]. It is finely known that standard of microstrip patch antennas are smart explanation of lot of wireless communication which demand due to their low-priced, average, comfortable, and easy-to-manufacture structural design [3]. On the other hand, the bandwidth of the main configuration in a lot of application is not enough to wrap up the needed functioning frequency range.
The patch antennas typically have narrow bandwidth and regarding the bandwidth enhancement several techniques have been proposed, including the use of an impedance matching network, the use of multiple resonators, thick substrate, planar inverted F antenna, the shorted L-probe or U-slot antennas [4]. While a microstrip patch antenna is overloaded by reactive element such as slot, stub or shorting pin, it give tunable or multi frequency antenna features. For the most part a well-liked method for obtain multi-frequency behaviour is to introduce the slots lying on a single patch [5].
In this paper, a multiband L-shape microstrip patch antenna is proposed. The modified multiband L-shape microstrip patch antenna shows the ability to create multi-bands at different frequencies. The multiband behaviour of the modified L-shape microstrip patch antenna is described in terms of the number of return losses. The radiation patterns of the measured modified L shape microstrip patch antenna clearly show the power radiated by an antenna at different frequencies [6]. The proposed design presents an approach of the rectangular patch with three L-type slot of different size, based with the commercial electromagnetic simulation tool, the FEM based software, HFSS by ANSOFT. Section II describes the antenna design and analysis for microstrip patch antenna. Simulations and results of antenna are projected in Section III. Conclusion is followed by the Section IV.

Antenna design and analysis:-
The proposed antenna construction is given away in Fig. 1. The rectangular microstrip patch of measurement W × L in print on the grounded substrate, which contain a relative permittivity ε r and also consistent by width h, the dielectric material is theoreticaly nonmagnetic by means of permeability μ 0 . The L-shaped slot with two small Lshaped slots among measurement (L1, W1), (L2, W2), (L3, W3) is preset in a rectangular patch (see Figure 1), the L-shaped patch rectangular antenna characteristics multi-band behaviour. The patch is feed with coaxial probe (50Ω) which is easy to formulate and have simulated radiation. In proposed feeding method, the coaxial connector with the inside conductor extend as of ground from end to end the substrate and is soldered to the radiating patch, whereas the external conductor extend from ground up towards substrate . The propose mathematical design of the practical antenna is given below a. Effective Dielectric Constant: b. Fringes Factor: c. Calculation of Length: e. Calculation of Ground Plane Dimensions: L g = L + 6h, W g = W + 6h (6) Where W is width of patch and h isthe height of substrate, L is length of patch ΔL is extension in length due to fringingeffect and c is speed of light in free space ƒ r is resonant frequency [5].
In this proposed design the computation of length and width are done by given formulas. The dimension of antenna is given by table 1. As shown in the figure.1 the patch has three types of L shaped slot their dimensions are also given in table1. We used "FR4" material for substrate which has dielectric constant 4.4 and height for this material is 1.5. Figure.2    HFSSDesi gn1 Radi at i on Pat t ern 1