UHF Antenna User Manual Rev1.3
UHF_Antenna_User_Manual_Rev1.3
User Manual:
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USER MANUAL UHF Antenna UHF ANTENNA – USER MANUAL 1 Change log .......................................................................................................................... 3 2 Acronyms list ....................................................................................................................... 4 3 Overview .............................................................................................................................. 5 4 Highlighted features ............................................................................................................. 5 5 Functional description .......................................................................................................... 5 6 Hardware layout ................................................................................................................... 5 7 Characteristics ..................................................................................................................... 7 7.1 7.2 7.3 7.4 Frequency .................................................................................................................................. 7 Polarization ................................................................................................................................ 8 Connectors ................................................................................................................................ 8 Gain ........................................................................................................................................... 9 8 Electrical characteristic ....................................................................................................... 10 9 Deployment mechanism..................................................................................................... 10 10 Materials ........................................................................................................................... 10 11 Mechanical and environmental test .................................................................................... 10 12 Included in the shipment ................................................................................................... 10 13 Handling and storage ........................................................................................................ 11 14 Warnings ........................................................................................................................... 11 ENDUROSAT 2 UHF ANTENNA – USER MANUAL UHF ANTENNA USER MANUAL This user manual is specially designed to describe the EnduroSat UHF Antenna module, its functions and features. Please read carefully the manual before unpacking the antenna in order to ensure safe and proper use. Figure 1 – EnduroSat UHF Antenna (Solar panel is a separate product) 1 CHANGE LOG Date 10/04/2016 01/08/2017 02/08/2017 Version Rev 1 Rev 1.1 Rev 1.2 21/11/2017 Rev 1.3 ENDUROSAT Note minor text enhancements power consumption and deployment added connectors added supply voltage for 3 UHF ANTENNA – USER MANUAL 2 ACRONYMS LIST LHCP Left Hand Circular Polarization RHCP Right Hand Circular Polarization RF Radio Frequency UHF Ultra-High Frequency PCB Printed Circuit Board ENDUROSAT 4 UHF ANTENNA – USER MANUAL 3 OVERVIEW The antenna is designed to cover the amateur satellite band 435-438 MHz. It has a circular polarization and uses a redundant burn wire mechanism with feedback for the deployment of the radiating rods. 4 HIGHLIGHTED FEATURES • • • • • • • • • UHF band for amateur satellite communications 435 – 438MHz; Compatible with EnduroSat Solar panels; Circularly polarized; Weight: 85 g; Gain > 0dBi*; Max RF output power 3.5W; Burn wire mechanism with feedback for deployment Supply voltage for deployment: 5V Max current consumption during deployment: 530mA (primary and back-up burning resistors working simultaneously) *from simulation 5 FUNCTIONAL DESCRIPTION The feed network for the RF part of the antenna is realized using strip lines. Each rod is fed with 90 degrees phase shift so that the antenna has a circular polarization. The antenna has a through hole for connecting it to EnduroSat’ solar panel Z. 6 HARDWARE LAYOUT Figure 2 depicts the bottom side of the antenna. All the dimensions are in mm. It uses up to 8 bolts for mounting to the satellite body (minimum 4 required: in this configuration, the bolts have to be installed in the proper locations as shown in figure 4). There is an opening in the PCB, through which an EnduroSat solar panel can be connected. The right angle MCX connector, used for connecting the antenna to the communication module, is located next to the opening. The thickness of the antenna and the height of the connector are shown on Figure 3. The overall thickness (and weight) of the antenna depends on the top cover. It can be a solar panel, a cover or another module. On figure 3 is shown the thickness of the whole antenna with a top cover of 1.6 mm ENDUROSAT 5 UHF ANTENNA – USER MANUAL Figure 2 - Physical layout bottom side - Dimensions in mm. Figure 3 - Side view - Dimensions in mm. ENDUROSAT 6 UHF ANTENNA – USER MANUAL Figure 4 – Proper installation of the 4 bolts configuration. 7 CHARACTERISTICS 7.1 Frequency Figure 4 shown the measured return loss of the UHF antenna Figure 5 - measured return loss of the UHF antenna ENDUROSAT 7 UHF ANTENNA – USER MANUAL 7.2 Polarization LHCP or RHCP with regards to antenna orientation. 7.3 Connectors C1 MCX right angle (upon request, straight MCX or SMA) C2 Four pin Molex Pico-Lock™ Figure 6 - Bottom Side - Connectors location In the case of collision between the MCX connector and the structure of the satellite, U.FL connector on the internal side can be accessed by disassembling the top cover of the antenna. C2 pinout: Pin 1 2 3 4 ENDUROSAT Mnemonic +5V I2C SCL I2C SDA Ground Description Positive I2C Clock I2C Data Ground 8 UHF ANTENNA – USER MANUAL 7.4 Gain Figures 7 and 8 show the radiation pattern of the antenna Figure 7 Figure 8 ENDUROSAT 9 UHF ANTENNA – USER MANUAL 8 ELECTRICAL CHARACTERISTIC Param eter Condition Supply Voltage [V] Current Consumption [mA] 9 Sleep mode Primary burning resistor Primary and Back-up burning resistor Min Typ Max 5 1 250 500 DEPLOYMENT MECHANISM The deployment mechanism uses burn resistors to cut a wire and release the doors holding the antenna rods. Each antenna rod has two separated circuits of resistors for redundancy. The module features a feedback network for deployment. It uses a four pin Molex Pico-Lock™ connector with I2C interface for providing feedback regarding antenna deployment. 10 MATERIALS The frame and doors used for holding the antenna rods rolled and encapsulated, is made of aluminum with hard anodization, which prevents a short circuit between the frame and the antenna rods. Rods are made from SMA – Shape Memory Alloy with super elastic properties to ensure straight shape after release. All the PCBs are made from FR-4. 11 MECHANICAL AND ENVIRONMENTAL TEST A full campaign of tests at qualification level was performed on the qualification engineering model. Qualification tests level and duration follow the ESA standard ECSS-E-ST-10-03C and GEVS: GSFCSTD-7000A. Test performed: • • • • • Thermal Cycling Thermal Vacuum Random Vibration Sine Vibration Shock Test 12 INCLUDED IN THE SHIPMENT EnduroSat provides along with the UHF antenna: • • • 2 Coaxial cable 50 Ohm, MCX to MCX and MCX to SMA connectors Power and command cable (PTFE Material Jacket, 24AWG), connector MOLEX 5040510401 USB stick with user manual Customized cables and connectors can be provided upon request. ENDUROSAT 10 UHF ANTENNA – USER MANUAL 13 HANDLING AND STORAGE Particular attention shall be paid to the avoidance of damage to the UHF antenna during handling, storage and preservation. The handling of the UHF antenna module should be performed in compliance with the following instructions: • • • • 14 Handle using PVC, latex, cotton (lint free) or nylon gloves The environment where UHF antenna module will be handled shall meet the requirements for a class environment 100 000, free of contaminants such as dust, oil, grease, fumes and smoke from any source. Store in such a manner as to preclude stress and prevent damage To prevent the deterioration, the UHF antenna must be stored in a controlled environment, i.e. the temperature and humidity levels shall be maintained in the proper ranges: o Ideal storage temperature range: 15ºC to 27ºC o Ideal storage humidity range: 30% to 60% relative humidity (RH). WARNINGS This product uses very fragile com ponents. Observe precautions for Handling. This product uses semiconductors that can be dam aged by electrostatic discharge (ESD). Observe precautions for Handling Sensitive Electronic device. Do not ship or store near strong electrostatic, electrom agnetic, m agnetic or radioactive fields. ENDUROSAT 11
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