Microstrip patch antennas or simply patch antenna are increasingly useful because the antenna is printed directly onto a circuit board. Building and testing an lband patch antenna for inmarsat. Use the bgan external antennas with the terminal indoors and the antenna outdoors. Deschamps in 1953, but didnt become practical until the 1970s when it was developed further by researchers such as robert e. The optimal antenna structure for inmarsat application has been fabricated and. I am using the rsp2pro receiver, multipsk and jaero, and a home made 9a4qav lband patch antenna with a nooelec lna and lband saw filter. An inset feed microstrip patch antenna is designed to increase the bandwidth and return loss. Our flagship maritime service provides dependable, seamless voice and broadband data coverage across the worlds oceans. Modified gps patch antenna for lband from sdrkits, model a154. A gpsstyle active lband patch receive antenna suitable for sdrplay sdr radios. We note that over the last several months we have been working on our own lband patch antenna that will cover inmarsat, gps and iridium frequencies all in one. We use a simple rectangular, half wave long, probefed patch operating in its fundamental mode as an example. Over the last several months weve been working on a versatile active lband patch antenna that can cover inmarsat to iridium satellite frequencies.
Introduction this article introduces the basic concepts of patch antennas. The patch antenna shown here is a good performer when used on a 2. I found this description for the dimensions of an inmarsat stdc antenna, and i was unsure about a few aspects. An inmarsat bgan terminal patch antenna array with unequal. First, the bandwidth of the patch antenna is very small. Point the top of the antenna facing the inmarsat satellite. This antenna designed to provide excellent coverage in the 1610. We expect manufacturing to be completed near the end of the month, or early next month. Patch antenna mounted on an optimized ground plane with a pigtail cable to a connector, which is tuned and packaged for the plastic radome that covers the. Inmarsat is a geostationary satellite service that provides services such as satellite.
A monthly journal of computer science and information. Optimized design of helical antenna with parasitic patch. The proposed antenna can produce a gain of higher than 9db, a 3db axial ratio bandwidth of nearly 15%, and a js11j bandwidth of nearly 19%. Inmarsat sets the gold standard for safety services, and quality of service is fundamental to our business.
Bgan inmarsat satellite antennas provide better reception for your bgan satellite internet terminals. The antenna works very well for both right hand circularly polarized r. Basics to decoding inmarsat lband signals using the rsp sdrplay. Here is the link page to the various patch antenna and microstrip antenna topics. It has more gain estimated at nearly 3db higher than my battle worn x10 patch. Fleetbroadband provides costeffective voice and data through a compact antenna, delivered globally via the i4 satellite and ground network, which maintains over 99. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces.
Nooelec 1550mhz inmarsat antenna premium pcb patch. Pdf improved lowprofile helical antenna design for inmarsat. Some noteworthy observations are apparent from figure 3. In the second video adam explains the dimensions of the antenna. Alternate feed methods a common variation in patch antenna design is the location and routing of the feed, to obtain a desired feedpoint impedance, to control the polarization, or for convenient layout. Frequency band 1535 mhz 1550 mhz for inmarsat satellites band. This protocol carries digital voice, fax and low speed data such as acars and adsc. Lband downlinks mostly consist of traffic which is delivered to mobile users. How does a coax cable and cable shield connect to an antenna like this, and how is the patch attached to the reflector. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. Homebrewing band dimensions for building a homebrew sirio gain master using insulated stranded copper wire and westflex 103 for the matching stub.
Building and testing an lband patch antenna for inmarsat c reception over on youtube adam 9a4qav creator of the lna4all and other rtlsdr related products has uploaded two videos showing his home made lband patch antenna in action receiving inmarsat c and in the second video describing the construction of the antenna. If the ratio lw is close to unity, the radiation pattern will be symmetric but may not provide a resonable input impedance. Nooelec pcb patch antenna for inmarsat lband application inmarsat aero. But i was able to receive and decode inmarsat aero and stdc data with just the magnetic antenna mount that comes with the r820t2 dongle with a nooelec outernet lna. Radio antennas free delivery possible on eligible purchases. It provides telephone and data services to users worldwide, via portable or mobile terminals which communicate with ground stations through fourteen geostationary telecommunications satellites.
A circular polarized self tracking l band array with high bandwidth. Remote controlled broadband service with lieflat antenna that. Isat is a british satellite telecommunications company, offering global mobile services. Also, how well in your experience does a patch antenna work verses a helix antenna or a modified gps antenna. The fundamentals of patch antenna design and performance. A highperformance lband inmarsat aerostdc patch antenna with a gain of 3. Rectangular patch antennas are notoriously narrowband. Improved lowprofile helical antenna design for inmarsat applications. A male to male sma connector is included to connect to your gear. Rtduriod is a having a lowest dielectric constant and can reduce the dielectric losses associated with microstrip patch antenna. Inmarsats ltac service has been designed with soldiers in mind to deliver robust, lowcost beyondlinesight blos mobile communications. Secondly, the microstrip antenna was designed to operate at 100 mhz, but it is resonant at approximately 96. An inmarsat bgan terminal patch antenna array with unequal input impedance elements and conductorbacked acpw seriesfeed network abstract. Inmarsat aero is the protocol thats used to link ground stations with aircraft via inmarsats satellite link.
A high performance lband inmarsat aerostdc patch antenna with a gain of 3. Well look at the polarization and radiation patterns, gain, impedance matching and frequency tolerance to determine the ideal patch for your design. I am interesting in constructing an antenna for reception of inmarsat at 54 degrees w 3f4. This small inmarsat patch antenna is meant for sizesensitive and portable applications. The optimal antenna structure for inmarsat application has been fabricated and measured.
An example of pricing is available here at more information from. Inmarsat decoding with a simple patch antenna youtube. Inmarsat s ltac service has been designed with soldiers in mind to deliver robust, lowcost beyondlinesight blos mobile communications. The broadband coverage of the antenna also includes frequencies of 1616 to 1626. On the two larger terminals one can choose between a contended shared bandwidth that is always available like a regular internet connection, or guaranteed, streaming bandwidth on demand, for transfer of critical data. Inmarsat reception patch antenna and line of sight. Nooelec pcb patch antenna for inmarsat lband application inmarsat aero stdc and satellites on 1550 mhz.
Polarization custom designs for critical data transmission. A lowprofile, wide impedance and cp bandwidth microstrip patch array has been designed and tested for inmarsat system at lband in this paper. Building and testing an lband patch antenna for inmarsatc. Beam inmarsat fixeddirectional antenna passive isd700 beam inmarsat mastpole marine antenna active isd710 beam inmarsat magnetic transport antenna active isd715.
I can see amer and aore from here, interestingly enough, from the same antenna placement, so they show up on the waterfall at the same time. Patch antennas are lightweight and versatile offering a typical gain response from 0 dbi. Click here to go to our page on circular patch antennas new for september 2018. The basics of patch antennas, updated orban microwave. Over on his blog coolsdrstuff, the author has uploaded a new post showing his comparisons of various home made inmarsat antennas. In his post he tests a tin can helix antenna, a 10turn helix antenna, and a lhcp helix feed on a 81cm directv dish. Inmarsat patch antenna easy build at home duration. Design of a new highgain circularly polarized antenna for inmarsat communications article in ieee antennas and wireless propagation letters 11. His results show that the dish outperforms the helix antennas by. The antenna is delivered with female sma connector soldered on the pcb. This also helps stay locked onto the inmarsat satellite signal. The reliability of the lband service means it can provide unlimited backup to our highspeed fleet xpress service, ensuring seamless global mobility.
This channel is mainly used by vessels at sea and contains enhanced group call egc. I picked up a cheap active lband patch antenna from an online seller and stuck it in place of the driven element of a homebew 1500 mhz yagi. At lband you can receive inmarsat and iridium digital telephony data, digital weather pictures, and many streams of telemetry type traffic. The antenna works equally well for right circular polarization rhcp and linear signals, over the entire frequency range of inmarsat. That antenna is now almost ready, and should be able to ship out from our chinese storage warehouse by week 1 or 2 of october note. Design of a new highgain circularly polarized antenna for. The microstrip patch antenna calculator determines the length l and width w of a rectangular microstrip patch antenna for a given resonant frequency or vice versa. Inmarsats network provides communications services to a. Antcom iridium gps inmarsat lband antenna with mount. Biastee must be enabled in software and lna gain and if gain controls must be. The goal is to understand the radiation mechanism, polarization, patterns, impedance and bandwidth. The antenna was indoors and beaming through a brick wall, im sure it would have been a lot better outdoors.
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