Now a day the requirement of wireless communication increased rapidly with the demand for applications. This leads to the requirement of the design of compact wireless transceiver units. The antenna is one of the major blocks in the design which defines the compactness and efficiency of the unit. In this work, an elliptical patch antenna is designed on the FR4 substrate with εr= 4.2. Again the effect of etching the ground is studied. Also, the effect of inset feeding length studied. In the work, the author discussed various methods to convert a narrow band (NB) antenna into the ultra-wideband (UWB) antenna and wise versa. The proposed antenna can work in ultra band operation from 1 GHz to 12GHz. The same proposed structure can work a wide band of 5.8 GHz bandwidth from 2 GHz to 7.8 GHz with inset feed.

The proposed work, a filtenna for s band application is implemented. It is designed by embedding an Interdigital band pass filter (IDBPF) and leaf shaped antenna which are operated in S band. The IDFBPF is having seven resonators with one end shorted through dual vias. It offers a bandwidth of 1.3GHz from 1.65GHz to 2.95GHz.  A Dumbbell shaped DGS (Defected Ground Structure) provided in ground to improve the filter characteristics.  Measured pass (BRL) band return loss (S11) & insertion loss (S12) are -18dB & -4.6dB correspondingly. Further, leaf shaped antenna is designed based on modified polar transformation equation; it has 2.7 GHz bandwidth from 1.3 GH to 3 GHz and has a gain of -5.45dBi, and return loss (S11) of -19.5 dB. The filtenna is obtained by integrating the IDBBPF in the fodder line of the leaf designed antenna. The final model has 1.2 GHz operating bandwidth from 02.30 GHz to 03.50 GHz with peak arrival damages at 2.4GHz and 3.1GHz with -20dB and-24dB respectively. The designed filtenna has a pass band gain of -5.3dBi. The shift in operating band is due to combining the filter with antenna. The proposed model is invented on FR4 substrate having a wideness of 01.60 mm and having a dimension of 0.25 0.58 ?02. In this final model two complementary slip ring resonators (CSRR) are used in addition with four dumbbell structures as defects in the ground plane to avoid ripples in return loss (S11) graph. A high degree of concordance exists between empirically measured and simulated outcomes. The radiation band is showing its application in S band wireless mobile communications, Wi-Fi and ISM 2.4GHz band.

In this proposal a frequency reconfigurable elliptical patch antenna is proposed for L and C and application. A PIN diode with resonator is used to get the frequency switching. It has its bandwidths of 2 GHz and 2.5 GHz respectively in L and C bands when diode is OFF and band width of 3.7GHz in C band when diode is ON. The proposed model is simulated using commercial RF tool-HFSS. The substrate used in simulation is economical FR4 with 4.2 dielectric constant value and 1.6mm height having dimensions 40mm X 42mm in which the patch is 20mm X 40mm. The return loss (S11), VSWR, radiation pattern, E and H plane field strengths are obtained and the constructive simulated results mentioned, which are show the switching in frequency operation.

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