New Simple and compact wide Ku-band Microstrip patch antenna is proposed. Defected patch and ground design is used to achieve wide band. The proposed antenna is designed on FR-4 substrate with dielectric constant 4.9 and thickness 1 mm and its overall size is 17 X 17 X 1.07 mm 3 with patch size 13 X 11 X 0.035 mm 3 . The results of proposed antennas like return loss, VSWR and radiation pattern (gain, directivity and efficiency) are simulated and analyzed using commercial computer simulation technology microwave studio (CST MWS). By simulating this antenna structure using above EM tool we are getting one wide band from 15.27 to 16.51 GHz with resonant frequency at 15.8 GHz. Return loss at this frequency is -25 dB. Gain and directivity at the resonant frequency are 4.45 dB and 5.17 dBi respectively. Radiation efficiency of this antenna is 84.8%. The VSWR ≤ 1.1 for the resonant frequency. The low profile nature and simple configuration of antennas show the way to easy fabrication. The proposed antenna is operating in wide range of Ku-band which includes different satellite applications (Fixed satellite, Mobile satellite, aeronautical radio navigation, space research, radiolocation etc.) Keywords-Ku-band, MSP (microstrip patch), RADAR (radio detection and ranging), Radiolocation, VSWR (voltage standing wave ratio), X-band.
A wideband down conversion ring mixer is proposed for multi band orthogonal frequency division multiplexing (MB-OFDM) system in 180 nm CMOS technology. The mixer is essentially used in a heterodyne wireless receiver to enhance the selectivity of the system. Being a nonlinear system, the mixer dominates the overall performance of the system. The design of down conversion mixer is the most challenging part of a receive chain. Wideband impedance matching always remains a challenge in any radio frequency integrated circuit design. This paper presents the design of a ring mixer with high linearity, wideband impedance matching using differential resistive impedance matching and without using any DC bias. The proposed mixer is tuned for a frequency of 3.432 GHz of band 1 of the MB-OFDM system. Mixer core is based on the FET ring mixer topology. The mixer is implemented in 180 nm CMOS technology. The mixer achieves the minimum conversion loss of 10.49 dB, 1 dB compression point (P1) of 12.40 dBm, third order input intercept point (IIP3) of 12.01 dBm, a minimum SSB noise figure of 8.99 dB, and S 11 of less than -10 dB over the frequency range of 0 to 13.61 GHz . The layout of the mixer records an active area of 183.75 μm 2 .
A novel wide stop band with high attenuation in stop band dual-band micro strip band pass filter for wireless local area network products (WLAN) are designed using the concept of coupled line micro strip structure. Wireless local area network products (WLAN) operate at 2.4GHz to 2.5GHz and 5.235 GHz to5.350 GHz bands. Finally, a new dual-band filter is designed, and it is demonstrated that good impedance matching at all the two ports and excellent selectivity between two pass bands which extends from 2.33 GHz to 2.63GHz and 4.5GHz to 5.37GHz are obtained. The simulated return loss is greater than 12 dB over the pass bands. The group delay is less than 2.4 ns over across the first pass band and it is less than 1.5ns over across the other pass band In addition, the existence of three transmission zeros one in between two pass band and other two on both sides of the pass band improves the selectivity of the proposed filter. The insertion loss at the center frequencies 2.5GHz and 4.87GHz are 2.14 dB and 2.77 dB respectively.Index Terms-Symmetrical coupled three-line micro strip structure, dual-band band pass microwave filters.
A 9 Slots dual band microstrip patch antenna is presented in this paper .The antenna resonates at 5.27 GHz and 7.61 GHz frequencies. The antenna is fed with coaxial feed giving bandwidths of 11.87%& 11.22%and VSWR of the both bands is less than 1.09.The proposed antenna can be used for WLAN (Wireless Local Area Networks) applications.
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