volume | PIER Journals

Abstract

In this paper, a substrate integrated waveguide based self-quadplexing antenna with modified U-shaped slots is presented. The quadplexing antenna resonates at four distinct frequencies 4.02 GHz, 4.37 GHz, 4.78 GHz and 5.26 GHz by adjusting the length of U-shaped slots. The antenna shows a minimum port isolation of >34 dB between any two ports. The self-quadplexing antenna gives the frequency tunability and shows an unidirectional radiation pattern at the corresponding operating frequencies. The simulated (measured) gains of the antenna are 5.18 dBi (5.24 dBi), 5.51 dBi (5.57 dBi), 5.03 dBi (5.14 dBi), and 5.12 dBi (5.19 dBi). The proposed antenna is independent of frequency tunability by the excitation of four ports with an antenna size of 0.12 λ₀², where λ₀ is the free space wavelength at the lowest resonant frequency. These features make the proposed antenna suitable for WLAN, ISM, INSAT C, Wi-Fi applications.

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Dr. Shaik Mahaboob Subani

Dr. Satya Nagakishore Bhavanam

Dr. Vasujadevi Midasala

Dr. Mallarapu Gopi Krishna