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This paper presents the design of a dual-frequency rectangular microstrip patch receiver antenna for Indian regional navigation satellite system (IRNSS) also called NAVIC. The dual feed single layer antenna works on operating frequencies at L5 band (1176.45 MHz) and at S band (2492.5 MHz). Here feeding is done through two ports. Hence antenna is dual feed. The antenna is designed in advanced design system (ADS) software and then after simulation we measure various parameters such as return loss (S11) in dB, impedance bandwidth, radiation pattern and aperture current distribution for the two operating frequencies.
The Indian regional navigation satellite system (IRNSS) is a navigation system covering India and part of its neighbors. It is owned by Indian government. The system is being developed by Indian space research organization (ISRO). The system consists of three segments they are as follows :(1)space segment (2)ground segment (3)user segment.
The space segment consists of seven satellites. The ground segment consists of spacecraft control center (SCC), IRNSS navigation centre (INC) and several other control centers. The user segment consists of IRNSS receiver. The receiver antenna can be either dual-frequency (L5 and S band frequencies) or single frequency (L5 or S band frequency) with capability to receive ionospheric correction.
There will be two kinds of IRNSS services they are (1) Special Positioning Service (SPS) (2) Precision service. Both services will be available on L5 (1176.45MHz) and S band (2492.08MHz). The Special Positioning Service is used to provide basic information that determines the position location for civilian and commercial purposes. The Precision service is used to further increase the accuracy of target location by armed force.
The main objective of this paper is to develop a dual-band antenna operating on L5band (1176.45MHz) and S band (2492.08MHz) on alumina substrate of relative dielectric constant value 9.6. The shape of the antenna is rectangular. The antenna is provided with two feeding ports in adjacent diagonal fashion. Through advanced design system (ADS) software we are going to simulate the given antenna and measure various output parameters such as reflection coefficient, axial ratio etc.
A compact, coaxial feed, dual band, dual feed, circularly polarized, rectangular microstrip antenna has been designed and simulated using ADS2009 simulation software. The proposed antenna achieved satisfactory values of return loss at the given two frequencies and it also achieved acceptable value of impedance bandwidth. One can further decrease the return loss value by increasing the substrate thickness.
Results show that the dual band antenna is compact and can be conveniently used as IRNSS receiver antenna and also for other wireless applications.
References A.Balanis, “Antenna Theory”, John Wiley & Sons,Hoboken,NJ,USA,2nd edition,2004.  Garg, P.Bhartia, I.Bhal and Ittipiboon, “Microstrip Antenna Design Handbook”, Artech House, Norwood Mass, USA, 2001.  Kumar and K.P.Ray, “Broadband Microstrip Antennas, Artech House, Norwood Mass, USA,2003.  Orban and G.J.K.Moernant, “The Basics Of Patch Antenna”, Google.
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