International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
Design And Analysis of Active Integrated Antenna(AIA) for WLAN Applications Pragati Bhagwat , Priyanka Harimkar, Sonali Khande, Sanjay Bhilegaonkar BVCOEW,Pune,India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - A new design of patch-slot-like microstrip active integrated antenna (AIA) is presented and discussed in this paper. The primary designed passive antenna is capable of supporting for WLAN bands at 2.45 GHz. The antenna with harmonic suppression capability is directly integrated with a amplifier to improved power added efficiency. The antenna is a microstrip patch with harmonic suppressing slits etched on it.The proposed passive patch antenna is integrated with a power amplifier (PA). The antenna has been designed on FR4 substrate dielectric constant 4.4 and thicknessh=1.53 mm & its dimension is 64.0 mm × 73.0 mm × 1.6 mm. The proposed antenna exhibits a much higher impedance bandwidth(2.302.66GHz) of about 15.33% (S11 < −10 dB) and the gain is about 3.4dB.The radiation pattern, return loss, VSWR and Bandwidth of the proposed antenna are described and simulated using HFSS software package.
advantage which makes the antenna suitable for circular polarization applications in future[7]. 1.1 ANTENNA DESIGN AND ANALYSIS The dielectric chosen is FR4-epoxy substrate having relative permittivity of 4.4 and the thickness of 1.53mm. The dimension of patch is approximated by using basic design approach described for microstrip patch antenna as listed below: Step 1: Calculation of Lambda (λ0)Lambda (λ0)=c/f=3x10^8/2.4x10^9 (λ0)=125mm at 2.4 GHz Step 2: Calculation of monopole length (L)The frequency of operation of the patch antenna is determined by the length L. The center frequency will be approximately given by:
Key Words: microwave amplifiers; active integrated antenna slits, active components. 1. INTRODUCTION In recent years, the active integrated antenna (AIA) aspect has become a growing and developing research area which has absorbed a lot of attention toward itself. In one definition the AIA can be considered as an active microwave circuit which its input or output is terminated in free space rather than the conventional 50- terminations. The active device in an AIA can be of any kind such as transistors (three-terminal device) or resisters, inductors and any planar antennas such as microstrip patch or microstrip slot antennas can be used as the radiating element. Active Integrated Antenna (AIA) is a direct integration between an antenna and an active circuit such as a power amplifier (PA), low noise amplifier (LNA), or an oscillator [1]. Such integration not only offers reduced circuit size by reducing parts of matching circuits, but also improves the performance of power amplifier when the antenna is designed to have harmonic suppressing capability[2] . The harmonic suppressing antenna has been designed from shorting pins , circular sector antennas , photonic band gap (PBG) structures , and defected ground[8]. While these designs show good improvement in power added efficiency (PAE), the design is relatively complicated. This paper presents a simple square antenna design that can be potentially modified to support both linear polarization and circular polarization for practical communication frontends[6]. This architecture is easy to fabricate compared with the shorting pins structure. Symmetric geometry is another
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Impact Factor value: 5.181
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Where fc=is centre freq=2.4GHz εr=4.4 and c=3x10^8 We get L=29mm For Square patch L=W So W=29mm Step 3: Calculation of Length of feed (Li & Lo)Lin=Lo=lam/8*sqrt(4.4)=7.5mm Step 2: Calculation of Length of feed (Lq)Lin=Lo=lam/4*sqrt(4.4)=14.5mm Step 4: Calculation of Length of feed (Lm)Lm=lam/4*sqrt(4.4)=14.5mmy0=7mm Step 5: Calculation of Feed length (L50)Feed length (L50)=lam/4*sqrt (4.4) L50=14.5mm Feed width calculate by using
Hence,we get W=2.84mm. 1.2 Active Integrated Circuit: For an active integrated antenna, the designed patch antenna should be directly connected to the amplifier's output as its load. Input impedance of the antenna can be used as a RLC load in HFSS simulation. After designing the matching networks for input and output ports providing maximum gain while considering the amplifier's stability, the next part is DC bias circuit. This ISO 9001:2008 Certified Journal
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