Antenna Matching Challenge -Tactical Communication. Nov Tuomas Reinvuo & Jarkko Unkeri COJOT

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2 Antenna Matching Challenge -Tactical Communication Nov Tuomas Reinvuo & Jarkko Unkeri COJOT

3 Contents Company presentation Background and main challenges in design antenna for tactical communication Transformers in antenna design Tactical communication in the future

4 Company presentation (1/3) Profound knowledge for top performance COJOT has 30 years extensive experience in the design, development and manufacture of innovative wideband antennas, serving worldwide military and public safety markets. Located in Espoo, Finland. Part of Alaris Holdings. ALH listed on the JSE AltX, Revenue 2015: 15.4 MEUR Focused on product development, sales and business management. All non-core functions are sourced from our partner net. Security clearance from the Finnish Defence Forces (NSA). NCAGE Code: A002G (SY686) Own brand and IPR

5 Company presentation (2/3) Antenna development and manufacturing COJOT products are designed, tested and manufactured in close cooperation with external business partners. R&D partners: SALO ESPOO RAKVERE Alaris Antennas (RSA) VTT (Espoo) SGS (Espoo) Espotel (Espoo) CWC (Oulu) Multiprint (Lahti) Environmental test institutions: VTT (Espoo) Insta (Tampere) Aalto University (Espoo) FDF Production facilities: Salo (~100 persons in production), Rakvere (~50 persons in production)

6 Company presentation (3/3) Expertise in wideband antennas COJOT antennas are the ideal choice for a broad range of different applications. We offer highly reliable and durable antenna solutions and suitable accessories: Vehicle Antennas Mobile Antennas 20 to 6000 MHz Antenna Accessories Manpack/Man Portable Antennas Services For different frequency ranges in the VHF, UHF and SHF bands Wide- and narrowband antennas in the MHz frequency range o o Vehicle antenna radiator for 3 30 MHz Compact vehicle antennas for 225 or 500 MHz 18 GHz For manpack/handheld and vehicle applications, including mast and shelter/container installations. For today s demanding EW systems, modern tactical and software defined radios (SDRs) as well as radio spectrum monitoring and management applications. Covering different antenna types like monopoles, dipoles, biconical, patch, high-gain, active and adaptive antennas. For high and low power applications from 10 to 250W.

7 Examples of Cojot products Typical environmental specifications Environmental specifications Temperature range (operating) ºC Temperature range (storage) ºC Humidity MIL-STD-810E Method Procedure III (cycle with extreme at 95 % RH, +60 ºC) Jammer antennas Communication antennas Shock Random Vibration Blowing Rain MIL-STD-810F, Method Procedure l (terminal peak sawtooth shock pulse, peak 40 g, duration 11 ms, three shocks in each of three orthogonal axes in both positive and negative direction) MIL-STD-810F, Method Category 24 All material minimum integrity test, exposure levels according to Figure 514.5C-17 MIL-STD-810F, Method Procedure l (rainfall rate 150 mm/h, wind speed 30 m/s) Beam Impact Resistance Impact at 40 km/h at 70 % height of the radiator Water Immersion MIL-STD-810F, Method Procedure l (depth 1 m) Wind Speed 190 km/h Monitoring antennas Active antennas Different types of accessories (see example video)

8 Field-proven solutions worldwide Customer types: Radio manufacturers (Jamming, Communication, Monitoring), Integrators, Defence forces

9 Antenna development Research & Development In-house, design tools HW design: Solid Edge and Solid Works Circuit simulations: AWR, CST, Optenni 3D EM simulations: CST Microwave studio PCB Design: PADS schematic & layout Electrical measurements VSWR: own premises + production testing Antenna radiation pattern Own open air measurement track from 20 to MHz (also for MHz) Own 3m fully anechoic chamber from 500 MHz to 6 GHz SGS Finland: 10m, 5m, 3m chambers and 3 m fully anechoic chamber Power rating: SGS Finland 200 W up to 6 GHz

10 Matching challege (1/2) Wavelengths vary at different frequencies: 10 m at 30 MHz 0.6 m at 500 MHz At frequencies where wavlengths are long relative to the size of the radiator, the antenna s radiation pattern will break l=λ/2 l=λ l=4/3λ l=3/2λ l=2λ

11 Matching challege (2/2) Capacitive load on because of a short radiator Small resistive load for impedance matching Wideband gain needed

12 Transformers in antenna design Cojot Patent (FI at year 2001) Matching easy to implement in VHF/UHF Benefits High power solutions Mechanically robust solution Cost efficient structure Simple and compact

13 Tactical communication in the future (1/2) Innovative and trendsetting technologies COJOT offers VHF/UHF adaptive wideband antennas that allow optimising the matching more efficiently across a wide frequency range of interest. Vehicle and manpack/handheld antennas with active matching: Frequency bands are split into smaller slots and each of these slots is matched separately. Areas that are naturally in tune will be fully obtained and the antenna s overall performance will be improved while additional benefits are gained: Electrical length tuning Extended range or reduced power consumption Smaller antenna designs Better signal quality Concept is applicable to different frequency ranges and antenna types (vehicle/manpack/hanheld)!

14 Tactical communication in the future (2/2) Advanced capabilities for enhanced efficiency