28 research outputs found

    Wide Band Open Ended Air Gap RLSA Antenna at 5.8GHz Frequency Band

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    RLSA antenna is a popular candidate for the application of Point to Point Microwave Link. This is due to its capability of carrying high speed signal. RLSA prototypes has been designed and developed at the frequency range of 5725 – 5875 MHz by few researchers. The classic design was using enclose air gap as a separator between radiation surface and ground plane. Then, the slow wave material has been used in the RLSA cavity. The implementation of FR4 board to RLSA design recently has allowed a reconfigurable and beam shaping of radiation pattern.[5]. The open air gap cavity structure normally implemented in broadband planar antenna.[6] This structure normally provide a wide bandwidth and good return loss on the desired frequency. Therefore, an investigation of this technique and hybrid with FR4 board as a cavity material will be very interesting due to condition of easy to manufacture, lighter the antenna weight and durable.[7

    Wide Band Open Ended Air Gap RLSA Antenna at 26GHz Frequency Band

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    RLSA antenna is a popular candidate for many applications such as Direct Broadcast Satellite Reception, Point to Point Microwave Link, RFID and Wimax Application. This is due to its capability of carrying high speed signal with high directivity characteristic and capability of beam steering and beam shaping. This paper will introduce the RLSA antenna designed at the frequency of 26 GHz for wireless backbone application. The antenna design was utilize open ended air gap as a separator between radiation surface and ground plane. The open air gap cavity structure normally implemented in broadband planar antennas. This structure normally provide a wide bandwidth and good return loss on the desired frequency. Therefore, an investigation of this technique and hybrid with FR4 board as a cavity material will be very interesting due to condition of easy to manufacture, lighter the antenna weight and durable. The model of RLSA antenna at 26GHz has been simulated. The results obtained a -25dB of reflection coefficient, 23.68dBi of directivity gain with wide antenna bandwidth capability. This research found an opportunity of utilizing RLSA antenna concept for extreme high frequency band application

    26 GHz Open Ended Air Gap Cavity RLSA Antenna for Next Generation Broadband Wireless Access

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    The demand of large bandwidth has pushed the wireless backbone into the mm-wave frequency range. A compact wireless terminal has been suggested at 26 GHz over the decade. A small and high gain antenna has been introduced because of the scenic point of view and for the environment. Next generation Fixed Wireless Access has been proposed at 26 GHz frequency band as a backbone carrier. A Radial Line Slot Array Antenna at 26 GHz frequency band has been developed. The air gap cavity approach has made the fabrication simpler and light. The gain exceeds 23 dBi has been realized at a frequency of 26 GHz with overall dimensions of 200 mm x 200 mm x 3.6 mm. The reflection coefficient better than -10 dB has been successfully achieved at operating frequencies between 25.5 GHz to 26.5 GH

    Effect of a Discrete PIN Diode on Defected Ground Structure

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    Abstract—This paper investigates the effect of a discrete PIN diode on Defected Ground Structure (DGS) where the different resonant frequency between ON and OFF state of the PIN diode is observed. Analytical modeling is determined and analyzed based on equivalent circuit of PIN diode and DGS. Then, a circuit simulation is performed using simulation software with different value of inductance and capacitance of DGS during ON and OFF state of the PIN diode. As a result, the resonant frequency of the PIN diode on the DGS shifted to higher frequency during ON state and shifted to lower frequency during OFF state. Besides, a larger value of inductance with a smaller value of capacitance of DGS will produce a larger range of resonant frequency between ON and OFF state and vice versa

    Cutting Technique for Constructing Small Radial Line Slot Array (RLSA) Antennas

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    ANALISIS PENGARUH PENAMBAHAN PENUTUP TEMBAGA PADA BIDANG POTONG ANTENA RADIAL LINE SLOT ARRAY ¼ LINGKARAN

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    Kebocoran daya pada bidang potong antena RLSA ¼ lingkaran menyebabkan nilai gain, bandwidth dan S1,1 menurun, oleh karena itu hipotesis menambah penutup tembaga pada bidang potong antena RLSA ¼ lingkaran menjadi solusi saat ini untuk melihat pengaruhnya. Antena RLSA yang dirancang menggunakan software VBA macros yang disimulasikan pada CST Studio Suite 2018 dengan spesifikasi jari-jari 85 mm, P0 16, sudut beamsquint 71°. Penutupan bidang potong menggunakan 4 skenario yaitu dari jauh ke dekat feeder, dari tengah ke samping kiri dan kanan, dari dekat feeder menjauhi feeder dan penambahan cavity beserta dengan tembaga di area feeder. Penutupan tembaga yang bisa memberikan performansi yang baik berada pada letak posisi tembaga 0 – 7 mm diukur dari tepi lingkaran dengan nilai gain 11,80 dB dan pada posisi tembaga 38 – 47 mm diukur dari tepi lingkaran dengan nilai gain 11,91 dB, jadi ketika dikombinasikan pada posisi letak tembaga tersebut mendapatkan nilai gain 12 dB menguat 0,27 dB, bandwidth 1,279 GHz dan S1,1 -26,11 dB. Pada skenario III dan skenario IV tidak ada yang mendapatkan nilai gain lebih tinggi dari antena RLSA ¼ lingkaran tanpa penutup tembaga sehingga membuktikan bahwa panjang penutup tembaga yang mendekati feeder memiliki performansi yang tidak baik
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