DELTA21/X/SMAM/S/S/20
Stubby Antenna, 433MHz, 1.5 VSWR, 1dBi Gain, Vertical Polarisation, SMA Connector
- Manufacturer: SIRETTA
- Product type:
- Antenna Type:Stubby; Frequency Min:-; Frequency Max:433MHz; Antenna Mounting:SMA Connector; Gain:1dBi; VSWR:1.5; Input Power:50W; Input Impedance:50ohm; Antenna Polarisation:Vertical;
- Gain: 1dBi
- SVHC: No SVHC (04-Feb-2026)
- VSWR: 1.5
- Input Power: 50W
- Antenna Type: Stubby
- Frequency Max: 433MHz
- Frequency Min: -
- Product Range: Delta 21
- Input Impedance: 50ohm
- Antenna Mounting: SMA Connector
- Antenna Polarisation: Vertical
| Delivery and price | |
|---|---|
| Units per pack | 250 |
| Price | 5.0 € |
| Current stock | 10+ |
| Lead time | 30 days |
## **Delta 21**
433MHz ISM Stubby Antenna
## **Key Features**
- Dedicated ISM Antenna
- ISM Band: 433MHz
- Discrete Antenna size
- TETRA Compatible.
## **General Description**
The Delta 21 is a dedicated 433MHz ISM band antenna which combines good performance with a small size, enabling its use with many of today’s remote control systems and 433MHz alarm systems.
## **Additional Considerations**
- Ideal for remote control systems and wireless alarms
- Does not rely on mounting on metallic surface
- Meets all EU compliance criteria for electronic goods
Terminated with an SMA male connector, it is ideally suited to applications requiring a simple, cable free set up, such as alarm panel equipment, garage or gate remote controls and TETRA Radio Systems.
The knuckle design allows the antenna to be positioned to take best advantage of the incoming signal. Allowing straight, 45° and 90° positions along with 360° rotation. The omni directional, radiating element is capped with a black high-grade rubber mould.
Siretta Ltd sales +44(0)118 976 9014 Basingstoke Road fax +44(0)118 976 9020 Spencers Wood email sales@siretta.com Reading web www.siretta.com Berkshire RG7 1PW
Registered in England No. 08405712 VAT Registration No. GB163 04 0349
Rev 1.0
**Delta 21** 433MHz ISM Stubby Antenna
## **Electrical Specifications**
## **Mechanical Specifications**
|Impedance:|50 Ohm|
|---|---|
|Max Power:|50W|
|Peak Gain:|1 dBi|
|VSWR:|<1.5 @ 433MHz|
|Operating Frequencies:|ISM: 433MHz|
|Radiation:|Omni|
|Polarization:|Vertical|
|Operating Temperature range:|-20 - +60°C|
|---|---|
|Storage Temperature range:|-30 - +75°C|
|Dimensions:|L68mm|
|Connector:|SMA male|
|Mounting Method:|Direct connect|
|Radome Material:|Polyurethane|
**Radiation Plots Horizontal** LEX **Vertical** JER £|s {| EY NEY **VSWR** Frequency VSWR se MEET yt 433MHz 1.175:1 S ~~ee~~ SSE EEE a CeCe Pee a a a 2 **Ordering Details** Part Number
**VSWR**
## **Ordering Details**
Part Number Description DELTA21/X/SMAM/S/S/20 Stubby 433MHz ISM Band Antenna, SMA Male
Registered in England No. 08405712 VAT Registration No. GB163 04 0349
Siretta Ltd sales +44(0)118 976 9014 Basingstoke Road fax +44(0)118 976 9020 Spencers Wood email sales@siretta.com Reading web www.siretta.com Berkshire RG7 1PW
Rev 1.0
Updated at June 9, 2026
Based in the United Kingdom, Siretta is a leading manufacturer of wireless communications and industrial Internet of Things (IoT) products. Since 1998, the company has specialized in designing high-performance connectivity solutions, driven by a dedicated engineering team and a strong emphasis on research and development to deliver future-proofed technologies for demanding applications. The cornerstone of Siretta’s offering is its extensive and versatile portfolio of RF antennas. Engineered to support a wide spectrum of frequencies from 400 MHz to 6 GHz, these antennas ensure reliable signal transmission across critical wireless networks. The comprehensive range encompasses robust solutions optimized for cellular technologies, including GSM, UMTS, LTE, Cat M, NB-IoT, and emerging 5G NR standards, as well as global positioning (GPS/GNSS) and WLAN/Wi-Fi systems. Beyond standard cellular networks, Siretta's advanced antenna designs provide excellent coverage for localized and low-power wide-area networks, including Bluetooth, Zigbee, LoRa, Sigfox, and various ISM bands. Supported by a deep understanding of the wireless market, engineers trust Siretta for the reliable, high-quality RF connectivity components necessary to build seamless industrial communication systems.
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