ATMS INDIA 2015 Design of Parallel Coupled Microstrip Bandpass Filter for IRNSS Navigation system Abstract— Satellite filters cover a large frequency range depending on the specific service offered by the satellite payload. In general the navigation satellite systems are naturally activated in the L and S bands (1-2 GHz, 2 -4 GHz, respectively). Indian Regional Navigation Satellite System (IRNSS) provides exclusive navigation services in L5 band and S band frequencies. This paper describes the proto model design calculations and its simulation for parallel coupled microstrip bandpass filter (BPF) for L5 and S band using MATLAB and Agilent Advanced Design system (ADS). The design process starts with the design methodology, filter design using MATLAB, layout design using Agilent ADS. Finally, the filter design results are presented at the end of the paper. Keywords— IRNSS, bandpass filter, L5 band, S band, MATLAB, ADS I. INTRODUCTION Indian Regional Navigation Satellite System (IRNSS) is an independent, indigenously developed satellite navigation system fully planned, established and controlled by the Indian Space Research Organization (ISRO). The IRNSS would provide two services, with the Standard Positioning Service open for civilian use and the Restricted Service, encrypted one, for authorized users (military). It will provide an accurate real time Position, Navigation and Time (PNT) services to users on a variety of platforms with 24x7 service availability under all weather conditions. The INRSS consists of three segments: space, ground and user. The space segment consists of a constellation of seven satellites: three GEOs (Geostationary Orbit) located at 34° E, 83° E and 131.5° E and four GSOs (Geosynchronous Orbit) placed at inclination of 29° with longitude crossing at 55° and 111° East. IRNSS ground segment consists of ground stations for generation and transmission of navigation parameters, satellite control, satellite ranging and monitoring. The user segment consists of a specially designed dual frequency receiver. Several types of receivers are planned with single and dual frequency reception. All the seven IRNSS satellites will be continuously tracked by the user receiver. IRNSS provides two basic services such as Standard Positioning Service (SPS) for common civilian users and Restricted Service (RS) for special authorized users. Each IRNSS satellite provides SPS signals in L5 and S bands. The IRNSS SPS service is transmitted on L5 (1164.45 – 1188.45 MHz) and S (2483.5-2500 MHz) bands. The Table (I) summarize the list of mid frequencies and its bandwidth of the navigation bands. TABLE I. CARRIER FREQUENCIES AND BANDWIDTHS Signal Carrier Frequency Bandwidth SPS – L5 1176.45 MHz 24 MHz (1164.45 -1188.45 MHz) SPS – S 2492.028 MHz 16.5MHz (2483.50 - 2500.00MHz) In this work we have designed bandpass filter for these two bands of frequency in L5 and S band with parallel coupled microstrip filter. Our goal is to achieve high accuracy in obtaining the required designed parameters (center frequency, return loss and insertion loss). The design and simulation are performed using Agilent ADS. The design equations are calculated and the filter response is verified using MATLAB. II. PARALLEL COUPLED BANDPASS FILTER The microwave filter is a two port network which used to control the frequency response by providing transmission at frequencies within the passband and attenuation in the stopband of a filter. Filters are an essential part of tele- communications and radar systems. Of its low-cost fabrication, easy integration and simple designing procedure, the parallel coupled-line filters are widely used in microwave microstrip circuits. A bandpass filter only passes the frequencies within a certain desired band and attenuates others signals whose frequencies are either below the lower cutoff frequency or above the upper cut-off frequency [1]. The range of frequencies that a bandpass filter passes through is referred as passband. Microstrip technology is a good candidate for filter design due to its advantages of low cost, compact size, light weight, planar structure and easy integration with other components on a single board. In Coupled Transmission lines, coupling between two transmission lines is introduced by their proximity to each other [2]. Coupling effects may be undesirable, such as crosstalk in printed circuits, or they may be desirable, as in directional couplers where the objective is to transfer power from one line to the other and another of their major use is using them in filtering the microwave range frequencies. The filter response will be based on the Tchebyscheff transfer function. Tchebyscheff type filters are popular for their high selectivity, i.e., they have a relatively fast signal cut off between pass and stop band [3]. Filters Jim Godwin.R.S 1 , Vineeth.V 2 ,S. Purushothaman 3 , Dr. S. Raghavan 4 1,2,4 Department of ECE, National Institute of Technology, Trichy-620015, India 3 EDMD/SIG, ISRO Satellite Centre, Bangalore-560017, India Email: [email protected], [email protected], [email protected]
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ATMS INDIA
2015
Design of Parallel Coupled Microstrip Bandpass
Filter for IRNSS Navigation system
Abstract— Satellite filters cover a large frequency range
depending on the specific service offered by the satellite
payload. In general the navigation satellite systems are
naturally activated in the L and S bands (1-2 GHz, 2 -4 GHz,
respectively). Indian Regional Navigation Satellite System
(IRNSS) provides exclusive navigation services in L5 band and
S band frequencies. This paper describes the proto model
design calculations and its simulation for parallel coupled
microstrip bandpass filter (BPF) for L5 and S band using
MATLAB and Agilent Advanced Design system (ADS). The
design process starts with the design methodology, filter design
using MATLAB, layout design using Agilent ADS. Finally, the
filter design results are presented at the end of the paper.
Keywords— IRNSS, bandpass filter, L5 band, S band,
MATLAB, ADS
I. INTRODUCTION
Indian Regional Navigation Satellite System (IRNSS) is
an independent, indigenously developed satellite navigation
system fully planned, established and controlled by the
Indian Space Research Organization (ISRO). The IRNSS
would provide two services, with the Standard Positioning
Service open for civilian use and the Restricted Service,
encrypted one, for authorized users (military). It will provide
an accurate real time Position, Navigation and Time (PNT)
services to users on a variety of platforms with 24x7 service
availability under all weather conditions.
The INRSS consists of three segments: space, ground
and user. The space segment consists of a constellation of
seven satellites: three GEOs (Geostationary Orbit) located at
34° E, 83° E and 131.5° E and four GSOs (Geosynchronous
Orbit) placed at inclination of 29° with longitude crossing at
55° and 111° East. IRNSS ground segment consists of
ground stations for generation and transmission of navigation
parameters, satellite control, satellite ranging and monitoring.
The user segment consists of a specially designed dual
frequency receiver. Several types of receivers are planned
with single and dual frequency reception. All the seven
IRNSS satellites will be continuously tracked by the user
receiver. IRNSS provides two basic services such as Standard
Positioning Service (SPS) for common civilian users and
Restricted Service (RS) for special authorized users. Each
IRNSS satellite provides SPS signals in L5 and S bands. The
IRNSS SPS service is transmitted on L5 (1164.45 – 1188.45
MHz) and S (2483.5-2500 MHz) bands. The Table (I)
summarize the list of mid frequencies and its bandwidth of
the navigation bands.
TABLE I. CARRIER FREQUENCIES AND BANDWIDTHS
Signal Carrier
Frequency Bandwidth
SPS – L5 1176.45 MHz 24 MHz (1164.45 -1188.45
MHz)
SPS – S 2492.028 MHz 16.5MHz (2483.50 -
2500.00MHz)
In this work we have designed bandpass filter for these
two bands of frequency in L5 and S band with parallel
coupled microstrip filter. Our goal is to achieve high
accuracy in obtaining the required designed parameters
(center frequency, return loss and insertion loss). The design
and simulation are performed using Agilent ADS. The
design equations are calculated and the filter response is
verified using MATLAB.
II. PARALLEL COUPLED BANDPASS FILTER
The microwave filter is a two port network which used
to control the frequency response by providing transmission
at frequencies within the passband and attenuation in the
stopband of a filter. Filters are an essential part of tele-
communications and radar systems. Of its low-cost
fabrication, easy integration and simple designing procedure,
the parallel coupled-line filters are widely used in
microwave microstrip circuits. A bandpass filter only passes
the frequencies within a certain desired band and attenuates
others signals whose frequencies are either below the lower
cutoff frequency or above the upper cut-off frequency [1].
The range of frequencies that a bandpass filter passes
through is referred as passband.
Microstrip technology is a good candidate for filter
design due to its advantages of low cost, compact size, light
weight, planar structure and easy integration with other
components on a single board. In Coupled Transmission
lines, coupling between two transmission lines is introduced
by their proximity to each other [2]. Coupling effects may be
undesirable, such as crosstalk in printed circuits, or they may
be desirable, as in directional couplers where the objective is
to transfer power from one line to the other and another of
their major use is using them in filtering the microwave
range frequencies. The filter response will be based on the
Tchebyscheff transfer function. Tchebyscheff type filters are
popular for their high selectivity, i.e., they have a relatively
fast signal cut off between pass and stop band [3]. Filters
Jim Godwin.R.S1, Vineeth.V2,S. Purushothaman3, Dr. S. Raghavan4 1,2,4 Department of ECE, National Institute of Technology, Trichy-620015, India
3 EDMD/SIG, ISRO Satellite Centre, Bangalore-560017, India